http://repositorio.jesuita.org.br/handle/UNISINOS/1692 PPG Geologia Fri, 17 Apr 2026 09:15:42 GMT 2026-04-17T09:15:42Z http://repositorio.jesuita.org.br/handle/UNISINOS/13991 Caracterização da estrutura da crosta do Cinturão Dom Feliciano e das bacias sedimentares no sul do Brasil e no Uruguai com base em dados magnetotelúricos 2-D/3-D Menezes, Aline Muriel da Cunha This thesis presents a regional geophysical investigation aimed at characterizing the structural architecture of the continental crust and the main sedimentary basins of southern Brazil and Uruguay, based on the integrated application of the magnetotelluric (MT) method in twodimensional (2-D) and three-dimensional (3-D) models. The analyzed dataset was acquired during three field campaigns (2012, 2019, and 2021), covering the Paraná-Sul and Pelotas projects and comprising ten MT profiles that cross Precambrian basement terrains and the Paraná, Camaquã, and Pelotas basins. The workflow integrated MT data acquisition, processing, modeling, and inversion, followed by calibration using complementary geological and geophysical information, including stratigraphic wells, gravity data, seismic profiles, and updated structural maps. The resulting resistivity models allowed the identification of deep crustal features such as ductile shear zones, suture zones, and major tectonic discontinuities, including the Ibaré, Dorsal de Canguçu, and Arroio Grande zones, as well as the Chuí Lineament. Additional structural boundaries were resolved, such as the Punta del Este–Jaguarão Terrane and the Pelotas Batholith. MT imaging proved capable of delineating these structures to depths of approximately 30 km. The results reveal significant lateral and vertical variations in electrical resistivity, reflecting lithological and structural contrasts that delineate crustal blocks, distinct terranes, and sedimentary units. The application of MT demonstrated high effectiveness in defining basement geometry, the thickness of the Phanerozoic basins and the Camaquã Basin, and in interpreting the regional tectonic evolution associated with the amalgamation of the Dom Feliciano Belt with the Rio de la Plata Craton. The integration of geological and geophysical datasets resulted in a refined crustal model and contributed to advancing the understanding of the deep crustal architecture of the região. Mon, 24 Nov 2025 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13991 2025-11-24T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13221 Caracterização de petrofácies e genese das rochas carbonáticas do reservatório Sapinhoá (Pré-sal, Bacia de Santos) e aplicação de aprendizagem de máquina por meio de microscopia óptica e imagens digitais a partir de atributos permo-porosos Oliveira, Rita Fabiane Guasina de The central focus of this doctoral thesis comprises the characterization of pre-salt carbonate reservoirs and the development of an innovative approach to predict the porosity and permeability of these rocks. This prediction method utilizes machine learning techniques, eliminating the dependency on geophysical data. The study is structured into three distinct manuscripts: (I) Petrography and Genesis of Carbonate Rocks from the Barra Velha Formation (Santos Basin, Brazil) and Associated Biogenic Structures, (II) Prediction of Porosity and Permeability of Carbonate Rocks Using Thin Section Data and Machine Learning Methods: A Systematic Review, and (III) Prediction of Carbonate Rock Porosity and Permeability Properties Using Convolutional Neural Networks. The techniques employed encompassed a conceptual literature review, as well as methodologies in machine learning, optical petrography of carbonate rocks, and convolutional neural networks. In the initial phase, 565 thin sections of pre-salt rocks were described through optical petrography, obtained from three wells within the Santos Basin. These descriptions facilitated the identification of primary carbonate facies, elucidated their genesis, and provided the dataset essential for training the neural network. Subsequently, a systematic literature review of prominent machine learning techniques was conducted, integrating the datasets obtained in the previous phase. The primary aim was to leverage these datasets for predicting porosity and permeability. Lastly, in the third phase, the training and prediction of porosity and permeability of pre-salt carbonate rocks were executed utilizing the same dataset utilized in the initial phase. Optical petrography enabled the identification of distinct carbonate facies within the pre-salt rocks, alongside their textural characteristics, mineralogy, and void percentage within the rock matrix. These attributes collectively formed the foundational components of the training dataset for poroperm prediction. Moreover, insights can be discussed regarding the genesis of pre-salt formations, contributing to the evaluation of the complexity inherent in these substantial oil and gas reserves. Concurrently, systematic bibliographic analysis aids in comprehending the most prevalent techniques employed for dataset generation. Ultimately, the training phase facilitated the development of an specific architecture for the dataset and the particular purpose of predicting porosities and permeabilities of pre-salt rocks, without the necessity for supplementary geophysical data. The integration of data from the optical petrography phase not only facilitated the acquisition and selection of the training dataset but also played a pivotal role in analyzing the data obtained during the predictive process. This phase encompassed the treatment and selection of the image dataset. Moreover, exploration of hydrothermal and biogenic evidence yields valuable insights into the genesis of carbonate facies and their impact on reservoir porous properties. The results obtained from the petrographic analysis of wells in the Santos Basin corroborate with the understanding of the importance of formation processes in determining the porous properties of rocks. The utilization of a convolutional neural network architecture enabled the extraction of porosity and permeability values from a heterogeneous and complex dataset, underscoring the efficacy of the developed architecture. It points out high predictive capacity for both porosity (R2 = 0.86) and permeability (R2 = 0.96), establishing itself as a fundamental tool for characterizing reservoirs in pre-salt carbonate environments. Subsequently, further experimentation will be conducted employing an expanded dataset comprising a larger number of images, alongside a novel hybrid approach, integrating images and labels obtained from the optical petrography phase for training purposes. Fri, 19 Apr 2024 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13221 2024-04-19T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/13220 Paleoenvironmental and biostratigraphic constraints for uppermost cretaceous (Maastrichtian) sedimentary successions of northern South America Patarroyo Camargo, German David One of the major environmental and biotic turnovers of the Phanerozoic occurred at the Cretaceous- Paleogene (K-Pg) transition, being the focus of countless scientific studies that addressed the timing, mechanisms and consequences of this global event. Though less explored, Late Cretaceous oceanic settings also underwent significant paleoenvironmental changes, due to a combination of global or regional paleoceanographic and tectonic events. This study aims to reconstruct paleoenvironmental conditions on a series of Maastrichtian localities along the equatorial South American margin. To have a better understanding of low-latitude water masses during that time, we applied high-resolution micropaleontological (foraminifers) and geochemical (sediment elemental ratios, carbon isotopes, among others) methods in shallow marine units from northern Colombia, and in deep-sea sites from the tropical Atlantic Ocean. Two Maastrichtian localities were considered in Colombia: (1) Core Diablito-1E (Colón Formation, Cesar-Ranchería Basin), and (2) the Aguablanca Creek section (Umir Formation, Middle Magdalena Valley). In general, foraminiferal assemblages were dominated by benthic taxa (Maastrichtian regional biozones Siphogenerinoides bramletti to Ammobaculites colombiana), and planktonic foraminiferal assemblages were mostly composed of Guembelitria cretacea and heterohelicids. Ostracods and calcareous nannofossil were also studied to provide integrated paleoenvironmental interpretations. Despite their potential, both microfossil groups had been poorly studied in this region. Integrated microfossil assemblages and sediment elemental ratios (Zr/Rb, Fe/Ca, V/Cr and Sr/Ba) in both localities clearly indicated a transition from inner platform settings, with moderately oxygenated bottom waters, to sublittoral conditions. Throughout the studied sections, weathering intensity increased, accompanied by increased input of terrigenous sediments. These environmental disturbances were related to the geological evolution of extensive epicontinental seas that occupied northern South America, and gradually disappeared due to sea level fluctuations, and the onset of the Andean orogeny since the Maastrichtian. To track paleoenvironmental disturbancesin the deep-sea, two Maastrichtian localities were surveyed in the tropical Atlantic Ocean: (1) Ocean Drilling Program (ODP) Hole 1258A (Demerara Rise), and (2) ODP Hole 1001B (Nicaraguan Rise). At Hole 1258A, high-resolution geochemical and benthic foraminiferal analyses suggest the occurrence of paleoenvironmental shifts during the entire Maastrichtian, related to changes in the intermediate to deep-water oxygenation and surface productivity, as well as a sudden dissolution episode in the earliest Maastrichtian. For instance, selected taxa (Aragonia, Nuttallides truempyi, Coryphostoma, Strictoscomella, among others), and the distribution of redox-sensitive trace metals (Ni, Cu) along the core, indicated suboxic bottom water conditions, with oxygenation pulses during the mid-Maastrichtian event (MME), which was identified by a high-resolution stable carbon isotope (δ 13C) record at the site. Moreover, sediment elemental ratios (log(Fe/Ca), Si/Ti, Fe/K) indicated fluctuations of biogenic silica and carbonate export via surface productivity, and probable disturbances of the regional hydroclimate since the early Maastrichtian. These disturbances of local surface productivity and bottom water oxygenation on Demerara Rise were likely related to the MME and the onset of the late Maastrichtian warming event, both linked to a higher interference of high-latitude deep-waters on the tropics and likely latitudinal migrations of the Paleo-Intertropical Convergence Zone (PITCZ). On the other hand, tracking paleoenvironmental disturbances at Hole 1001B was more challenging since diagenetic issues hampered good microfossils preservation, whose assemblages suggested a typical bathyal setting. However, the sedimentary archive of Hole 1001B was sensitive enough to allow identifying of the K-Pg boundary with a preliminary δ13C survey, also indicating subtle changes of surface paleoproductivity and bottom water conditions during the late Maastrichtian, as suggested by sediment elemental ratios (log(Fe/Ca), Si/Al, Ba/Al, Fe/K) and concentrations of redox-sensitive trace metals (Ni, Zn, V) along the core. Finally, the analysis of mercury (Hg) concentrations as a proxy for widespread volcanic activity was conducted in three of the studied localities: Sites Diablito-1E, ODP Holes 1258A and 100B. Considering the shallowing processes underwent by core Diablito-1E, and the poorly explored influence of the northern South American volcanism during Maastrichtian, Hg concentrations could not be exclusively linked to a single volcanic source (Deccan or regional volcanism). Bulk sediments δ 13C analyses at Core Diablito-1E, the first ones conducted in Maastrichtian rocks from this area, indicate that the lowlatitude sedimentary record has the potential to track perturbations of the global carbon cycle. Moreover, the sedimentary records from Demerara Rise and Nicaraguan Rise illustrated significant Hg peaks along the Maastrichtian, which based on their proposed age models and comparisons with other Maastrichtian localities, would evidence the influence not only of Deccan volcanic episodes but also of the less studied volcanic pulses in the Caribbean during the late Maastrichtian. The role of those widespread processes on the low latitude climate is a promising field of study. These results clearly pointed out that the northern South America region was particularly sensitive to paleoenvironmental disturbances during the Maastrichtian, reflecting their highly complex geological evolution during the latest Cretaceous. Fri, 03 May 2024 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/13220 2024-05-03T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/12942 Análises de isótopos estáveis de carbono e oxigênio em carapaças de ostracodes: estudos metodológicos e aplicações no cretáceo do Brasil Rodrigues, Gislaine Bertoglio Ostracods are used in the study of stable isotopes due to the high environmental sensitivity of their carapaces, wich are rapidly calcified preserving the isotopic characteristics of water in different aquatic environments in wich they lived. Cretaceous ostracods have potential for carbon and oxygen stable isotopic studies as well as recent and Cenozoic ones, commonly used. The carbon isotopes provide information about biological paleoproductivity and nutrients availability in oceans and lakes, while oxygen isotopes estimate paleotemperature and paleosalinidaty that prevailed in both marine and non-marine deposits. Besides the palaeoenvironmental information, the isotopic data allow the dating of geological events. The scarcity of isotopic studies on Cretaceous ostracods carapaces led to the development of experimental and comparative studies as subject of this doctoral thesis. This thesis presents the methodologies used in the rock disaggregation and preparation and selection of ostracods carapaces for isotopic analysis. The good results obtained in isotopic analysis of marine and non-marine ostracods carapaces demonstrated that they can be used in paleoenvironmental studies, provided they appropriate techniques applied. Fri, 20 Jan 2012 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/12942 2012-01-20T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/12866 Estudo tectono-sedimentar da bacia de Pelotas Cassel, Marlise Colling The Pelotas Basin is the southernmost basin on the Brazilian margin, resulting from the Gondwana breakup. The basin covers an area of 250,000 km², limited to the north by the Alto Florianópolis (Santa Catarina, Brazil) and to the south by the Alto Polonio (Uruguay). Its thickness reaches up to 12 km from the Barremian to the Recent. It is a unique basin in the South Atlantic when compared to other basins of the same margin due to the presence of a very thick package of sewarddipping reflectors and the lack of known hydrocarbon reserves. However, it is still considered hydrocarbons depleted compared to other basins on the margin. Since it is a basin with genetic specificities (structural and stratigraphic), different from other Brazilian marginal basins, it was necessary to generate new data and analyze and reinterpret existing data. The present doctoral thesis is committed to the stratigraphic aspects and comprises studies on the basin filling and structural compartmentalization. The data base includes seismic and wells from the Brazilian National Agency for Petroleum, Natural Gas and Biofuels (ANP). This data was analyzed in the Petrel software versions 2017, 2018, 2020, developed by Schlumberger, and TemisFlow Petroleum System Software version 2019, developed by the French Petroleum Institute and BeicipFranlab – Oil and Gas Consultancy. The studies consisted of seismic interpretation, backstripping, South Atlantic spreading rate analysis, and 2D numerical basin modeling. The results allowed to identify the Andean Cordillera tectonic influence on the Pelotas Basin sedimentation as uplift pulses and identify the climatic influence of the Drake Passage widening from the Oligo-Miocene through the contour currents record. The interaction between the South American, Antarctic, and Nazca tectonic plates was identified as the root of these influences. Additionally, overpressure in the Rio Grande Submarine Fan was well constrained for the first time by numerical modeling, and its causes were identified, including high sedimentation rate, a thick package of subcompacted shales, and smectite-illite transformation. Fri, 25 Mar 2022 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/12866 2022-03-25T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/12830 Pré-caracterização microestrutural de microfósseis calcários aplicados como proxies paleoambientais e paleoecológicas no início do Daniano Bom, Marlone Heliara Hünnig This thesis addresses the importance of geochemical pre-characterization, based on microstructural analysis of Danian calcareous microfossils. Based on the hypothesis that more assertive paleotemperature estimates can be reconstructed with microstructural analysis of fossils, this thesis allowed to make new paleoenvironmental and paleoclimatic contributions for the Danian in the South Atlantic Ocean. The study carried out with samples from Ocean Drilling Program (ODP) Site 1262, Walvis Ridge, revealed that stable oxygen isotope (δ 18O) records from benthic foraminifera were diagenetically altered by growth of authigenic carbonates. This process was observed at stratigraphic levels that recorded reduced bottom water oxygenation, such as during the Dan-C2 and Chron C29n events. The ocean surface at this location was also affected, as observed in the internal structures of planktonic foraminifera. Changes in the ecosystem, associated with increases in temperature, appear to have been environment for calcareous dinocysts. Isotopic measurements of these calcareous spheres reflect original environmental signatures. In a shallow marine context, in the Neuquén Basin, Argentina, the Cretaceous (K-Pg) boundary is very well delimited and characterized. The excellent preservation of early Danian ostracod assemblage was confirmed by different geochemical pre characterization techniques, such as SEM-EDS (scanning electron microscopy coupled energy dispersive spectroscopy), µXRD (micro x-ray diffraction) and µRAMAN (Raman spectroscopy). Records of organic matter, such as kerogen, were identified in ostracod valves, suggesting excelent preservation. The excellent results allowed us to infer paleecological preferences of four Danian species, contributing to the scarce isotopic database recorded for this Fossil Group over this time interval. Clear disperion patterns of carbon (δ 13C) and oxygen isotope values revealed evident intraspecific differences between ornate and smooth species. Sat, 30 Sep 2023 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/12830 2023-09-30T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/12259 Análise icnológica do permiano inferior da Bacia do Paraná e sua aplicabilidade em estudos de dinâmica da linha de costa Martín, Jorge Villegas This thesis approaches the application of ichnological data as stratigraphic signatures to infer paleocological and paleoenviromental parameters. In this way, the suite and ichnofacies changes through the early Permian succession of the Paraná Basin permitted to infer the coastline relative dynamics in higher scale (3ra and 2 order). The study of this succession included the lithological and ichnological composition of the Rio Bonito, Palermo, and Irati formations recovered in different cores. This analysis permitted to identify signatures of paleoenviromental stress (depleted oxygen and salinity) evidenced by the high density of Palaeophycus in the Rio Bonito deposits and stratigraphic signatures such as autogenic and allogenic surfaces demarked by Glossifungites suites in the Rio Bonito and Palermo formations, respectively. The vertical distribution of ichnofacies from base to top (impoverishes Skolithos– archetypal Cruziana– distal Cruziana (lower ichnodiversity) ichnofacies), and distinctive sedimentologic signatures (estuarine – lower shoreface – offshore subenvironments) reinforcing the transgressive character of the early Permian succession. Thus, this thesis demonstrates the utility of the ichnological data for resolving stratigraphic, paleoenvironmental and paleoecological questions. Thu, 21 Feb 2019 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/12259 2019-02-21T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/10241 Proveniência dos minerais pesados na planície costeira do Rio Grande do Sul Carassai, Julierme Justin Quaternary sandy barriers store the evolutionary history of the last 400,000 years of sedimentation along the southern Brazil Atlantic coast. Studies of provenance allowed to identify the heavy minerals composition of the four barriers in the northern half of the Coastal Plain of the Rio Grande do Sul State: epidote, tourmaline, zircon, magnetite/ilmenite, Alpolymorphs (andalusite, kyanite and sillimanite), staurolite, rutile, amphibole, pyroxene, corundum, perovskite, chromite, garnet, apatite, monazite, xenotime, spinel and titanite. This research contemplated the analysis of the different distribution patterns of minerals in the aeolian and upper shoreface-foreshore systems of each barrier, as well as the behavior of these according to the various particle sizes (80-170 and 170-230 mesh). Studies of provenance developed with a large number of detrital zircon grains by U-Pb allowed to establish the primary source areas for the successive barrier systems. Zircon and other heavy minerals were mainly attributed mainly to a distant source, related to the drainage basin of the Rio de La Plata estuary, and secondary one, associated with the drainage basins of the to the Camaquã and Jacuí rivers. The characterization of the sands origin of the quaternary coastal barriers allowed also the formulation of a hypothesis about the origin of sediments accumulated in the Rio Grande Fan. Fri, 27 Oct 2017 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/10241 2017-10-27T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/10172 Análise icnológica do intervalo Siluriano-Devoniano da Bacia do Paraná e sua aplicabilidade em estudos de variações relativas do nível do mar Sedorko, Daniel This thesis has as its main approach the use of ichnological data as indicators of stratigraphic signatures, paleoenvironmental parameters and relative paleobathymetry, and aims, mainly, to diagnose changes in ichnological suites along the SiluroDevonian of the Paraná Basin. Based on the hypothesis that the ichnological analysis allows inferences of sea level oscillations on a larger scale (3rd or 2nd order), the Siluro-Devonian succession (Furnas and Ponta Grossa formations) was prospected, focusing on the Campo Gerais region of Paraná. to investigate its faciological, ichnological and fossiliferous composition. This integrated analysis enabled the diagnosis of key stratigraphic signatures (eg Glossifungites in sequence limits, dense occurrence of Zoophycos in the treatment of high-level or low accommodation space systems; Lingulichnus in the treatment of transgressive systems or finning upward cycles), as well as it allowed the definition of paleoenvironments (mainly reinforcing the marine context of the Furnas Formation) and ichnostratigraphic zones (defining the Lower Silurian age for the lower and middle units of the Furnas Formation). It also guided the recognition of third-order depositional sequences for the Paraná Supersequence. Specific studies were carried out on the northwestern edge of the basin (Mato Grosso do Sul) to compare with data from the southeastern edge (Paraná), attesting to the shallower character of the northern deposits. Paleocological data inferred by the ichnological analysis helped to understand paleobiological events, mainly related to faunal changes during the Devonian (Zlíchov Basal Event and the decline of Fauna Malvinocáfrica). In summary, this thesis demonstrates the potential of Ichnology to solve paleoenvironmental, paleobiological, ichnostratigraphic issues and to help define sequence frameworks. Wed, 21 Nov 2018 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/10172 2018-11-21T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/10171 Taxonomia e aspectos paleoecológicos dos ostracodes do Maastrichtiano – Daniano (formações Jagüel e Roca) da seção de Cerro Azul, General Roca, Bacia De Neuquén, Argentina. Ceolin, Daiane The Neuquén basin is known by its rich and well preserved fossil content exposed in a complete and excellent sedimentological records, constituting an ideal location for study of the K–Pg boundary. Despite of the large number of published works in the area, recently new sections have been discovered. Among these, the Cerro Azul section is of great importance due to its abundant and well preserved ostracod fauna which spans the K–Pg boundary. In the present study, a total of 27 samples from the Jagüel and Roca formations (Maastrichtian-Danian) of the Nequén basin were analysed. The faunal study allowed the recognition of 113 species, belonging to 51 genera and 11 families. From these, 10 new genera, 41 new species and a new subfamily Nodoconchiinae, were described. The new species are: Cytherella saraballentae, Cytherella semicatillus, Paracypris bertelsae, Paracypris imaguncula, Argilloecia abnormalis, Argilloecia concludus, Argilloecia hydrodynamicus, Bythoceratina cheleutos, Phelocyprideis acardomesido (new genus and species), Eucythere dinetos, Krithe crepidus, Cytheropteron hyperdictyon, Cytheropteron bidentinos, Cytheropteron translimitares, Aversovalva glochinos, Eucytherura stibaros, Hemingwayella verrucosus, Heinia prostratopleuricos, Loxoconcha (s.l.) posterocosta, Keijia circulodictyon, Keijia kratistos, Paramunseyella epaphroditus, Munseyella costaevermiculatus, Ameghinocythere archaios, Aleisocythereis polikothonus, Castillocythereis multicastrum (new genus and species), Castillocythereis albertoriccardii, Cythereis stratios, Cythereis clibanarius, Cythereis trajectiones, Henryhowella (Wichmannella) praealtus, Hysterocythereis paredros (new genus and species), Hysterocythereis coinotes, Hysterocythereis diversotuberculatus, Orthrocosta decores (new genus and species), Orthrocosta atopos, Orthrocosta phantasia, Sthenarocythereis erymnos (new genus and species), Nodoconcha polytorosa, Nodoconcha sanniosis, Nodoconcha upsilon and Ectonodoconcha lepidotus (new genus and species). The new genera Aleisocythereis, Apatoleberis, Apobradleya and Petalocythereis were proposed to accomodate species previously described for Neuquén Basin. Some evolutionary aspects of the identified fauna, mainly regarding the Trachyleberidinae and Nodoconchiinae subfamilies, are discussed. The paleoecological interpretation based on the faunal association present in the Cerro Azul section allows the inference of a marine, inner to mid-shelf environment, with a dominance of the family Trachyleberididae in both Maastrichtian and Danian rocks. The K–Pg boundary is marked by a considerable faunal change, characterized by the appearance of a richer and more abundant Danian fauna alongside 21 species which survived the extinction event. The presence of predation on the carapaces is documented, possibly caused by naticid snails. Fri, 20 Mar 2015 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/10171 2015-03-20T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/10167 Pteridófitas do final do cretáceo da Ilha Livingston (Península Antártica) e Cerro Guido (Patagônia Chilena) e suas implicações evolutivas, paleoambientais, paleogeográficas Trevisan, Cristine The knowledge of fossil plants lived in the Antarctic Peninsula and Patagonia until the arrival of colder climates at the end of the Eocene (Reguero et al., 2013), allows us to assess the biodiversity of past forests in high latitudes, help in understanding their modern distribution and about the processes adopted in its dispersion, as a response to changes in climate and paleogeography. In these paleoflora, pteridophytes are an important element and have shown an easy adaptation to different types of soils and unstable conditions due to nearby tectonic processes. Thu, 30 Aug 2018 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/10167 2018-08-30T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/10111 Proveniência, paleogeografia e sedimentologia dos depósitos do Grupo Itararé no extremo sul da Bacia do Paraná Tedesco, Julia Fine-grained rhythmite is a recurrent sedimentary facies in glacially-influenced marine and lacustrine sequences throughout geological time. Paleoenvironmental interpretation of these ancient deposits has been a challenged since similar rhythmites may have formed in different depositional contexts. In the Paraná Basin, the Itararé Group contain numerous successions of fine-grained rhythmites, deposited in the Carboniferous during the Late Paleozoic Ice Age (LPIA). Thus, the purpose of this study is: (i) to characterize sedimentological aspects of different rhythmites of the Itararé Group in southern Paraná Basin, and (ii) interpret their depositional environments. The described rhythmites are characterized by the intercalation of fine-grained sandstones and siltstones with clay and clayey siltstones. We have identified two distinct types of rhythmites based on the contact between couplets, couplets thickness, sedimentary structures, and geochemical proxies. Rhythmites type 1 is characterized by intercalation of very fine-grained sandstone/siltstone (60-90%) with claystone (40-10%) and normal grading. Rhythmites type 2 is characterized by couplets of siltstone (50%) and claystone (50%), with a sharp contact within couplets. Rhythmites type 1 is interpreted as turbidity current deposits and type 2 as distal deposits of hypopycnal flow. Geochemical proxies suggest deposition of the rhythmites under marine conditions, in a period of rising temperatures and humidity, and with intensified chemical weathering. These paleoenvironment characteristics are in agreement with the interglacial period. The preservation of thick rhythmite successions of the Itararé Group in the southern basin was controlled by the constant creation of accommodation space inside paleovalleys. Sat, 24 Aug 2019 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/10111 2019-08-24T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/9698 Sequências deposicionais do Grupo Itararé (Carbonífero e Eopermiano), Bacia do Paraná, na área de Dr. Pedrinho e cercanias, Santa Catarina, Brasil: turbiditos, pelitos e depósitos caóticos D'Avila, Roberto Salvador Francisco Outcrops of sedimentary strata from Mafra and Rio do Sul formations (Itararé Group, Paraná Basin) constitutes the record of the Gondwana permocarboniferous glaciation in Santa Catarina state, southern Brazil. These deposits were mainly deposited in glacially influenced prodeltaic and in relatively deep and distal settings related to marine glaciers. They are constituted by sandy and conglomeratic turbidites, slowly settled pelites, deposited below storm wave base and chaotic strata, originated by debris flows, slumps and slides. These rocks had been studied in regional scale, including sections next to Alfredo Wagner, Vidal Ramos, Aurora, Rio do Sul, Trombudo, Presidente Nereu and Lontras cities, as well in the scale of detail, in Dr. Pedrinho region. Five depositional sequences, with regional extent, were correlated along 300km, from Santa Catarina to the north of the Paraná state. Each sequence initiates with the abrupt entrance of sandstones and conglomerates over muddy beds, marking a downward shift of depositional facies to the basin interior, in consequence of the relative sea level fall. Sequences 1 to 4, main targets of this study, are equivalent the Itararé Group, reaching a thickness of 450 m. The glacial influence in these sequences is notable, registering the phase when the Gondwana was situated next to the polar region during Carboniferous and early Permian. These glacio-influenced units present a change in the climatic pattern, from sequences 1 up to 4. Sequences 1 and 2 records colder conditions, passing to a mild, temperate climate, marked by glacier retraction and concurrent establishment of fluvial systems and vegetation, already during sequences 3 (final) and 4, as the Gondwana moves away from the polar region. The lowstand systems tract of sequences 1 to 4 is characterized by thick turbidites, generated by subaqueous outwash flows, produced by retreating marine glaciers and by hiperpicnal flows, produced by catastrophic fluvial floods. Tillites are very rare deposits, formed in moments of significant advance of glaciers in the basin, causing glacio-eustatic sea level falls. Prodeltaic pelites and fine-grained deposits related to tidewater glaciers are interbedded with thin-bedded turbidites and chaotic strata, constituting the most common deposits of the transgressive systems tract of sequences 1 to 4. Rapid progradations, developed during the highstand systems tract, propitiated the deposition of unstable pelitic packages, frequently remobilized as slumps and more evolved debris flows, resulting in thick chaotic beds. The change in paleocurrent directions indicates an important modification of sediment supply in the basin during the “Itararé time”. Paleocurrents of sequences 1 to 3 indicates a sediment transport to the north, while paleocurrents from the upper part of sequence 3 and 4 indicates an increasing sediment supply to south and southwest, preceding the bigger tectonic inversion registered by Fm. Rio Bonito. Sequence 5 is composed of postglacial Rio Bonito formation sediments, deposited in deltaic, fluvial, and shallow marine (waves and tides) contexts. Tue, 26 May 2009 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/9698 2009-05-26T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/9664 Aplicação de inteligência artificial e machine learning em dados litoestratigráficos e geofísicos das expedições do Programa Internacional de Descobertas Oceânicas (IODP) Bressan, Thiago Santi Specific computational tools help the geologist to identify lithologies and stratigraphic stacking in well drilling, reducing operational costs and managing the professionals practical work time, directing them to efficient data interpretations or even in the improvement of scientific research in the region. in geologically distinct regions. In this study, the application of machine learning algorithms for the supervised classification of lithologies was evaluated. Data from records of multivariate parameters in offshore wells were used, related to the International Ocean Discovery Program (IODP) with supervised and unsupervised data (images), with the creation of a context of hybrid application of algorithms, divided into two manuscripts. In manuscript I, through the analysis of the lithologies proposed in 7 IODP-Expeditions and the use of the use of the algorithms, it was possible to group and divide the lithological sets into four groups of lithologies and templates. The geophysical properties used in the present study included GRA, PWL, MS, RSC and SRM. The templates were submitted to training and testing by the Multi-Layer Perceptron (MLP), DecisionTree, RandomForest and Support Vector Machine (SVM) methods, using the classification metrics as the result evaluation. As a result, it was observed that Template1 obtained better results in the MLP algorithm, Template2 and Template3 obtained better results in the RandomForest algorithm above 80.00% accuracy. For Cross-validation, the RandomForest algorithm achieved excellent performance in all scenarios. In the Practical Template, the G2 lithology group obtained the best result with the MLP algorithm with an average accuracy greater than 85.00%. For manuscript II, the division of the data included the formatting of three datasets: dataset0, dataset1 and dataset2, specifically with the data obtained during the IODP-Expedition 362. The petrophysical data used included PWL, GRA, RSC, NGR, MAD, MS, RGB and high-definition images. Dataset0 included temporary training data to validate the best interpolator. The dataset1 has the interpolated data of the petrophysical properties, making a total of 295,945 records for U1480 and U1481 with 17 features. The dataset2 covers the texture and color data extracted from the segmentation of the images, making a total of 85,058 records for the U1480 and U1481, with 90 features. Each data set is replicated in two groups of lithology: Group 1 and Group 2. For dataset2, new combinations are added between the features forming 102 practical arrangements with specific results in each combination. The values were interpolated by Linear, Spline, Slinear, Quadratic, Cubic, Akima, Pchip and Piecewise. The machine learning method used for all datasets is RamdomForest. The results show that the best interpolator evaluated in dataset0 is Akima with an accuracy of 98.22%. For dataset1, U1480, the accuracy value is 96.96% in the combination of 70% training and 30% testing in Group 1 and 97.71% in the combination of 70% training and 30% testing in Group 2. For dataset1, U1481, the accuracy value is 99.68% in the combination of 80% training and 20% testing in Group 1 and 99.74% in the combination of 80% training and 20% testing in Group 2. For dataset2, the best evaluated practical arrangements are 51 (Group 1) and 102 (Group 2) for U1480 and practical arrangements 32, 33, 44, 45 and 51 (Group 1) and 102 (Group 2) for U1481. Regarding the new Area Superpixel (Apx) method, the best results are in Group 1 with the greatest combination of training and the least combination of tests. The evaluated datasets were grouped in an organization between the expedition sites, in which a context of real practical application in the daily activity of the geologist was generated with excellent results of lithological classification. The interpolation of petrophysical data is valid and necessary when there is little data for training respecting the characteristics of each property and interpolator. Properties extracted from the images are relevant and grouped together with the petrophysical properties create a context of extreme importance in the discovery and presentation of information to the geologist. Mon, 22 Feb 2021 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/9664 2021-02-22T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/9548 Ostracodes não-marinhos da Formação Orós, Cretáceo Inferior da Bacia do Iguatu: taxonomia e inferências bioestratigráficas e paleoambientais Santos Filho, Marcos Antonio Batista dos The Interior Northeast Basins of Brazil are a group of basins situated to the south of the Potiguar Basin that originated during the rifting that led to the establishment of the Atlantic Ocean, and can be used as analogues to the depositional environments of the continental margin. However, many of these basins were not comprehensively studied, even though they have an important record of the Lower Cretaceous, with an extensive fossiliferous content. Non-marine ostracods, an important group for the biostratigraphy and correlation between Lower Cretaceous Brazilian basins, are abundant in the region. The objective of this thesis is to study the ostracod fauna of two continuous sections in the Iguatu Basin, named Transnordestina A and Transnordestina B, in order to contribute to the biostratigraphic and paleoenvironmental knowledge of this group for the region. 156 samples were collected, in which 19 species from genera were found: Cypridea hystricoides, C. paraibensis, C. cf. C. clavata, C. punctacentralis sp. nov., Brasacypris ovum, Pattersoncypris sinuata, P. cf. P. sinuata, Pattersoncypris? sp., Ilyocypris? arca., Ilyocypris? latanodi., Rhinocypris? ericius, Pythagoracypris latavectis, Hastacypris adamantem, Looneyellopsis mvili, Musacchiocythere plastica, Musacchiocythere? sp., Alicenula leguminella, A. cf. D. oblonga, and an incerta sedis species. Based on the species found, a Hauterivian – Aptian age interval was inferred. For the paleoenvironmental interpretation, two main ostracod groups were found: one dominated by Alicenula, indicative of higher humidity periods, and one dominated by Cypridea¸ indicating dryer periods. High values of the elemental ratios Ca/Ti and Ca/ΣTi, Fe, Al indicated that arid conditions dominated at the base of the sections. Ciclostratigraphic analysis indicated the presence of six 120 ka cycles for the base of the section and 10 120 ka and three 405 ka for the middle and top. The author hopes that this work demonstrates the potential that the deposits of the small Northeastern basins have to help advancing the biostratigraphic and paleoenvironmental knowledge for the Lower Cretaceous, which still requires greater amount of date for its better understanding. Thu, 17 Dec 2020 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/9548 2020-12-17T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/7431 Análise da exatidão posicional na integração de dados de (sub)superfície em modelos digitais de afloramentos a partir de sensores remotos não orbitais Silva, Reginaldo Macedônio da The increasing advance of new technologies in the field of geosciences, such as GNSS positioning, mapping by GPR or the generation of three dimensional models with the LIDAR technique allows the integration of orbital and non-orbital remote sensing techniques for different applications in geosciences. Thus, it is necessary to experiment, test and scientifically evaluate the potential of integration of these different technologies in order to explore the different types of data. The analysis, description and interpretation of outcrops are daily activities of the geological fieldwork. Despite the technological advances in the last decades, the acquisiton of quantified data from instruments and sensors did not substitute the traditional source of data of the geologists: the observation of the rock. Thus, the study of outcrops is fundamental in the acquisition of intermediate data between the megascopic (e.g. regional geology) and microscopic scales (e.g., sample), quite dependent of acquisition by remote sensors and instruments. The main challenge in this type of research is to integrate quantitative digital data obtained by instruments and sensors based on different principles with qualitative, analogic data, obtained by the subjective perception of the geoscientist. The main purpose of this study was to analyze, test and validate this multidisciplinary approach to the modeling of outcrops considering a real case study in Morro Papaléo Outcrop. For this, it was considered as a premise that the geological model resulting from the integration of different data had not a positional error in an order of magnitude higher than the spatial resolution of the more limited sensor. The data integration using appropriate methodological procedures allowed generate a Digital Outcrop Model (DOM) which made it possible to view, measure and accurately interpret the geology from a 3D geological representation. The field validation was performed to ensure that the quality of the proposed methodology can be used in this type of study. Through geophysical sections was possible to correlate subsurface data with those obtained with the LIDAR technique, allowing data integration of surface and subsurface data. Therefore, with the establishment of the 3D model generated in a consistent database, calibrated and validated, at any time more data can be added to this dynamic model. Mon, 11 Aug 2014 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/7431 2014-08-11T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/5721 Nanofósseis calcários do Campaniano e Maastrichtiano no Atlântico Sul: bioestratigrafia, paleoceanografia e paleobiogeografia Guerra, Rodrigo do Monte The Late Cretaceous period is characterized by global climatic transition that influenced calcareous nannofossil assemblages posing a challenge for biostratigraphic interpretation between different latitudinal degrees. There are a few studies on South Atlantic calcareous nannofossils from 1980 and 1990 decades, but none of them evaluate the South Atlantic as a whole. Therefore, this study aims to describe the calcareous nannofossils assemblages in each latitudinal zone and test the bioevents synchroneity. It were selected 649 samples from twelve cored sections coming from DSDP (Deep Sea Drilling Project) e ODP (Ocean Drilling Program) close to the Brazilian and African margins, in addition to an outcrop in the Antarctic Peninsula. The taxonomic study allowed the identification of 197 calcareous nannofossils species from the Campanian and Maastrichtian. Using the correlation between the biostratigraphical data and magnetostratigraphy, it was possible to identify diachronism in some bioevents of first and last occurrences during the late Campanian and late Maastrichtian. This diachronism is related to species migration between low and mid-latitudes, due to changes in the ocean circulation and surface water temperature. Based on the latitudinal variation in the calcareous nannofossils assemblages, a detailed biostratigraphic study enabled the South Atlantic division in three zonations (low, medium and high-latitudes). We also defined the distribution pattern of some species, indicating a clear paleobiogeographical division between high latitude species and some species limited to low and mid-latitudes. This pattern was possibly controlled by surface water temperature variation. Other species have a wide distribution across the latitudes probably related to nutrient availability. Tue, 19 Jan 2016 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/5721 2016-01-19T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/4706 Ambientes de sedimentação mista (siliciclástica e carbonática), cicloestratigrafia e halocinese durante o Albiano, Plataforma de Regência, Bacia do Espírito Santo Tagliari, Claudio Vinicius The main goal of this thesis is to define the origin of the carbonate, hybrid and siliciclastic Albian rocks of the Regência Platform that occur in the offshore portion of the Espírito Santo Basin. To achieve this objective, the following hypotheses were tested: was there any external control on the cyclic arrangement of the carbonate, hybrid and siliciclastic strata and, if so, of which sort? What would have favored the excellent preservation of the cyclicity within a transitional to shallow marine, dynamic and high energy depositional setting? Did the siliciclastic, mixed and carbonate depositional systems co-exist at the high-frequency scale? To explain these questions, it was required to define (1) a depositional/paleoclimate model that properly explain both vertical and lateral facies changes; (2) the origin of the cyclicity; (3) the influence of basement and salt tectonics in the deposition and preservation of the studied interval; and (4) the paleogeographic (regional scale) and stratigraphic (facies scale) setting ascribed to the studied interval. The data set includes 3D seismic and well data (logs, cores and cuttings) from which seismic and stratigraphic sections, lithofacies and paleogeographical maps, and block-diagrams were derived. A reactivation of the Cedro - Rio Doce Fault Zone during the Eo-Albian divided the Regência Platform into a high (to the West) and a low (to the East) block. This event has also caused the partial displacement of the older studied interval (Sequence A) to the basin depocentre due to halokinesis. Based on 180m of cores obtained from distinct stratigraphic intervals within Sequence A, 14 lithofacies were distinguished and organized into 8 facies associations whose superposition confirmed the allocyclic nature of the facies succession. It was presented a depositional model able to explain the vertical succession of lithologies within a high-frequency “ideal sedimentary cycle” as well as the regional arrangement of the main lithologies at the 3 rd order scale. The spectral analysis of the gamma-ray logs previously tied to lithological information from well data confirmed the allocyclic nature (short eccentricity) of the cyclicity as well as has allowed establishing the time interval recorded in the studied interval. This later result demonstrates that this approach can be used as a powerful geochronometer able to quantify the time span of a sedimentary succession in a higher resolution than the traditional paleontological method. It is well known that shelfal and transitional environments are subject to high energy episodes and large sea-level changes that lessen the depositional preservation potential and so the cyclicity record. In this context, the excellent preservation of the cyclicity within the studied succession was ascribed to the high siliciclastic sedimentation rate favoring salt escape and increasing accommodation. Fri, 27 Sep 2013 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/4706 2013-09-27T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/3610 Arquitetura deposicional e compartimentação estrutural do Aquífero Passo das Tropas na região de Santa Maria-RS: influências no comportamento hidrogeológico Wankler, Fábio Luiz This thesis presents a multi-scale analysis of the Passo das Tropas Aquifer in the Santa Maria region aiming to identify giga- to macro scale, vertical and horizontal hetereogeneities. The Passo das Tropas Member (Middle Triassic of the Parana Basin) comprises a 20 to 30 m thick sandstone package deposited over an area of 2.428,92 Km² within an extensional basin (half graben). Employed method include geological mapping (giga- and mega-scale), outcrop and well log (gamma-ray) correlation, 3D modeling (mega- and meso-scale), facies analysis (meso-scale) and Ground Penetrating Radar (meso-scale) interpretation. The Passo das Tropas fluvial system represent the onset of the neo- to meso- Triassic sedimentation during wich multi-episodic, channel belt fills were superimposed. At this time, the fluvial systemwas perennial and braided, and former under steady subsidence rates on an extensional basin (half graben). This system was subdivided into two low accommodation rate system tracts (São Valentim and Sarandi subunits) that include deposits of axial and transversal fluvial systems, respectively. The boundary between both units is a regional-scale, secondary expansion surfasse that occur as a discontinuous bed of argillite of intraformacional conglomerate. Each subunit presents an internal architecture characterized by the superposition of tabular bodies or lenses bounded by 5th order surfaces. Acquired information indicates that the Passo das Tropas Aquifer encompasses two main aquifer types: a first one characterized by a set of small unconfined aquifers located on topographic highs on the southern and southwestern portions of the study area and a second one formed by a confined aquifer located on the northwestern region of the same study area. Both types of aquifers were further affected by NW-SE and NE-SW fault systems (up to 20 m of vertical displacement) that segmented them into structural blocks and sub-blocks, with deformation zones displaying deformation belts, drag folds, fault breccias and shale smears. The hierarquical classification of the vertical and horizontal heterogeneities and anisotropies of Passo das Tropas Aquifers led to the elaboration of a hydrogeological conceptual (qualitative) model. Fri, 25 Aug 2006 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/3610 2006-08-25T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/2192 Análise de sustentabilidaede de uso do sistema Aquífero Guarani em Ivoti – RS Heine, Carlos Alvin Water, as a hydrous resource, has caused an increasing concern about its protection and sustainable use. There has been an emphasis on surface water, which is the most used, while groundwater has been used during drought periods. This work has focused on groundwater, by assessing the sedimentary reservoir known as Guarani Aquifer System, specifically in an area situated within the limits of Ivoti and Estancia Velha, in Porto Alegre Metropolitan Region, Rio Grande do Sul. This area has been chosen because it is exclusively supplied by groundwater, which is extracted from impoundments called tubular wells belonging to “Companhia Riograndense de Saneamento” (CORSAN), besides a great number of other impoundments used by factories, households, schools, hospitals, etc, thus composing a scene that is likely to cause conflicts due to shared use of groundwater. Agenda 21, chapter 40, of the United Nations Conference on Environment and Development, held in Rio de Janeiro, Brazil, in 1992, has emphasized the necessity f Fri, 31 Oct 2008 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/2192 2008-10-31T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/2193 Estratigrafia de alta resolução aplicada à modelagem de reservatórios do início do rifte da Bacia de Sergipe - Alagoas Borba, Cláudio In this work, the results of a tectonic-stratigraphic study on the early rift strata of the Sergipe-Alagoas Basin, northeastern Brazil, were applied to the characterization and modeling of reservoirs. Furado area, a mature oil field, was selected as laboratory because it presents these strata so nearly complete, and has lot of static and dynamic data. We applied a multidisciplinary approach (tectonics, stratigraphy and reservoir characterization) and also a multi-scalar approach (from the context of deposits in the basin to the zoning of producing reservoirs). The 2nd order sequences (K10-20 and K34-K36 corresponding respectively to the Feliz Deserto Formation and Barra de Itiúba/Penedo Formation ) were sliced into 3rd sequences. The stratigraphic analysis suggests that the beginning of rifting process that had already occurred in the Sequence J20-K5 (Serraria Formation) was gradual over 20 Ma. This process is characterized by the absence of a conspicuous unconformity of the onset rift in which the parallel Fri, 05 Jun 2009 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/2193 2009-06-05T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/2191 Caracterização paleoambiental a partir dos componentes orgânicos particulados em depósitos bioturbados do Bloco Central da Jazida Carbonífera do Iruí (Cachoeira do Sul, RS) Rossi, Adriana Rost The integrated analysis of sedimentology and paleoichnology of the Rio Bonito Formation and the lower part of Palermo Formation (Paraná Basin) in Cachoeira do Sul region (Rio Grande do Sul State, south Brazil) revealed that the Rio Bonito Formation are characterized at the base by tide-dominated fluvio-estuarine deposits, changing upward to wave-dominated estuarine deposits, which are overlapped by the shallow marine deposits of the Palermo Formation. With the aim of refine such interpretations, a high-resolution paleopalynologic analysis of the bioturbed deposits is conducted in this study. Thus, 26 samples were selected from the cores IC-07-RS, IC-44-RS, IC-03-RS and IC-12-RS, from the central area of the Iruí Quarry (Cachoeira do Sul). Only mudstones and siltstones samples were used for the paleopalynologic analysis, in order to homogenize possible disparities in the organic assemblage due to the grain-size. Paleopalynomorph and palynofacies samples were prepared following the traditional methods for Pa Mon, 15 Dec 2008 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/2191 2008-12-15T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/2188 O Espongilito de Três Lagoas, MS: registro e caracterização com ênfase em micropaleontologia Silva, José Luiz Lorenz Wed, 15 Dec 2004 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/2188 2004-12-15T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/2190 Sedimentação mista carbonato-siliciclástico durante o albo-aptiano na porção emersa da bacia Sergipe-Alagoas Falcone, Célia Maria Oliveira The Albian-Aptian mixed sediments, composed of carbonate and siliciclastic constituents, occur in the onshore portion of the Sergipe-Alagoas Basin, next to its current border. Outcrops are located 50 km to northwest from Aracaju and, for the greater part, in oil well areas. The interpretations now presented are based on outcrop description, georadar sections, electric well logs, well litology data, thin sections, isolith maps and stratigraphic sections. The succession is composed of fan delta deposits, wave dominated coastal sediments (mixed sediments) and carbonate ramp. In relation to the fan delta, the proximal facies (delta plain) are dominated by sandy-graveley longitudinal bars and secondarily by debris flow deposits. The sub-aqueous portion is represented by accumulations in protected areas (e.g. bays). The delta front is constituted of conglomerates, sandstones and secondarily siltites associated with gravitational flows and trative flows, eventually reworked by waves. Delta front distal deposits grad Wed, 22 Feb 2006 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/2190 2006-02-22T00:00:00Z http://repositorio.jesuita.org.br/handle/UNISINOS/2189 Compartimentação espacial e arcabouço hidroestratigráfico do Sistema Aqüífero Guarani no Rio Grande do Sul Machado, José Luiz Flores Wed, 16 Mar 2005 00:00:00 GMT http://repositorio.jesuita.org.br/handle/UNISINOS/2189 2005-03-16T00:00:00Z