http://hdl.handle.net/11422/55 2026-05-07T00:28:55Z 2026-05-07T00:28:55Z Barbosa, Guilherme Freitas http://hdl.handle.net/11422/29130 2026-05-05T15:55:52Z 2013-03-04T00:00:00Z

Title: Caracterização de fácies carbonáticas do sistema lacustre do intervalo Alagoas da Bacia do Araripe, nordeste do Brasil Author(s)/Inventor(s): Barbosa, Guilherme Freitas Advisor: Borghi, Leonardo Abstract: The Araripe Basin located in Northeastern Brazil contains a sequence of lacustrine carbonate rocks that represent an important record of the paleocontinent Gondwana during the separation of the tectonic plates and the opening of the South Atlantic Ocean during the Cretaceous. The Alagoas stage (~ Aptian) in Brazilian basins presents many problems concerning the geological, tectonic, stratigraphic, and mainly, paleoenvironmental environments, considering those raised by recent oil discoveries in the Santos Basin ("Pre-salt") in continental southeastern margin. The present study aims to characterize facies and microfacies of carbonate rocks, corresponding to the Rio da Batateira and Crato formations. In this context, the study of these rocks becomes important to understanding of the origin and evolution of this system and the possibility of correlation with other basins in the equatorial margins, continental and marine. Twenty two thin sections were prepared for petrographic analysis, collected in mines, outcrops and drill-cores from Araripe Basin. Carbonates are lacustrine in origin, autochthonous, including the balanced-fill and underfilled types, with possible marine influence, formed under conditions of fresh water to saline environments. They were classified into 4 types of facies: (1) laminated limestone (mudstone) (2) massive limestone (wackstone), (3) nodular microbial limestone (Bindstone), (4) microbial limestone with microcalcispheres (Bindstone). It was recognized nine types of microfacies ("A" through "I"), grouped into six facies associations deposited in marginal, transitional and central lake areas Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2013-03-04T00:00:00Z Plantz, Josiane Branco http://hdl.handle.net/11422/29129 2026-05-05T15:05:18Z 2017-06-01T00:00:00Z

Title: Interpretação paleoambiental e modelo evolutivo da porção central do complexo deltaico do Rio Paraíba do Sul (RJ) Author(s)/Inventor(s): Plantz, Josiane Branco Advisor: Ramos, Renato Rodriguez Cabral Abstract: The Paraíba do Sul deltaic complex (PSDC), located on the northern coast of the State of Rio de Janeiro, is a border region between the ocean and the continent that shelters a wide variety of sedimentation environments. The PSDC is stratigraphically positioned at the top of the Campos Basin, encompassing part of its Quaternary sedimentation and is, admittedly, an area of sediment storage for deep waters, which gives it great sedimentological and economic importance. The region has been the target of studies since the 1940s, however, the majority of the work done was based on superficial data and shallow sampling, geophysical data from wells and seismic lines are very scarce, as well as deep wells with continuous sampling. A lack of studies that allow the characterization of the sedimentary succession and its distribution. Based on this, the present work seeks to better understand the evolution of the central portion of the PSDC from information derived from subsurface. For this purpose, 2-TO-1-RJ, 2-MU1-RJ and 2-BG-1-RJ well cores, which were continuously sampled up to 181m, 200m and 410m, respectively, were used. The well cores were analyzed based in facies analysis concepts, with interpretation of sedimentary processes and depositional paleo-environments. Analysis of diffraction of X-rays, total organic carbon (TOC) and palynofacies were performed to evaluate the paleoenvironmental characterization of the 2-TO-1-RJ and 2-MU-1-RJ well cores. From the paleoenvironmental interpretation and characterization the stratigraphic correlation was performed between the three well cores, adopting the maximum flood surface (MFS) as datum. Correlations show that the sedimentation of the central portion of the PSDC was controlled by the high frequency oscillations of the sea level (events of creation and destruction of accommodation space). The forced regressive events (fall of the base level) are responsible for shaping the relief and form important incised valleys that control all subsequent sedimentation. In transgressive events happens the formation of estuaries and lagoons, at the maximum of the penult marine transgression (123,000 years A.P.) there is the installation of a marine environment with deposition of carbonate rocks that mark the MFS. The correlations suggest that neotectonic movement of NW structures occurred and it was responsible for the uplift of the block the left of the study area. Regressive and transgressive events subsequent to the neotectonic reactivation are responsible for the installation of a strandplain, whose age is attributed to about 80,000 years of A.P. Deposits of the last marine transgression (5,100 years old) are recorded Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2017-06-01T00:00:00Z Pita, Renato Cosme dos Santos http://hdl.handle.net/11422/29110 2026-04-30T03:00:15Z 2017-07-01T00:00:00Z

Title: Hidrogeoquímica da porção oeste do aquífero Alter do Chão na zona de interface com o aquífero Içá-Solimões, região metropolitana de Manaus e adjacências Author(s)/Inventor(s): Pita, Renato Cosme dos Santos Advisor: Silva Junior, Gerson Cardoso da Abstract: The Amazon region presents large availability of surface water and groundwater, however surface resources are often inadequate for human consumption. Hence, a growing groundwater exploitation throughout the region occurs. Albeit the expanding demand, scientific knowledge on Amazonian aquifers is still limited. Generating new data and integrated analysis of hydrogeological knowledge on the region is, therefore, becoming increasingly necessary. The aquifer associated with the Alter do Chão Formation - Alter do Chão Aquifer (ACA) - is largely discussed in the Amazon region due to its importance to water supply. Recent studies have indicated its possible continuity throughout the Amazon basin, as part of the great Amazon Aquifer System (AAS). The aim of the work is, therefore, to generate new insights on the ACA functioning with new hydrogeochemical and hydrogeological data in the important interface of ACA with Içá and Solimões Aquifer Subsystems, located west of Manaus. In two field campaigns, measurements of water levels and in situ physical-chemical parameters were carried out, along with groundwater sampling in wells, Water analyses comprised principal cations and anions, dissolved metals, nitrate, phosphate, fluoride and bromide, as well as isotopes (180, 2H, 13C, 14C, 36CI). A survey of the geological characteristics and aquifer boundaries was also made, based on data from existing oil wells, water wells and piezometers. Data were analyzed with usual interpretive tools (diagrams, graphs) and geochemical calculations (Phreeqcl code). Results showed ACA water west of Manaus has apparently two main origins: waters of meteoric origin, poorly mineralized, located in the upper aquifer layers, in an unconfined system, with direct rainfall recharge; and waters of remote origin, more mineralized, with longer residence times in the aquifer, stored in the deeper layers, probably in a confined system. Isotope analyzes suggest an average age of 20.38 thousand years for more mineralized groundwater occurring in deeper wells in Manacapuru and Careiro municipalities. The exercise performed with Phreeqc/ pointed to the geochemical feasibility of this hypothesis. Because of this hydrogeochemical differentiation, correlated with local geology, the waters of Alter do Chão Aquifer System are subdivided in an upper unconfined and less mineralized portion, and another older and mineralized lower portion, both mixed westwards of Purus Arc, with a progressive dilution by rainfall Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2017-07-01T00:00:00Z Matos, Claudia Sá Rego http://hdl.handle.net/11422/29031 2026-04-09T03:00:14Z 2015-09-18T00:00:00Z

Title: Análise micromorfológica dos depósitos sedimentares do sítio arqueológico Conjunto Vilas, Tefé (AM) Author(s)/Inventor(s): Matos, Claudia Sá Rego Advisor: Ramos, Renato Rodriguez Cabral Abstract: The work presents the results of the geoarcheological analysis of the Conjunto Vilas site, Tefé-AM. As the analysis propose an observation of the object in several scales (archeological site, excavation units and anthropogenic soil components), the data acquired is very diverse, resulting the adoption of a group of techniques. During the fieldworks, it was made pedological, geological and archeological observations that resulted in specific records For the analysis of components of each archeological feature or horizon, it was made a micromorphological analysis of thin sections made from undisturbed samples. The analysis of the thin sections was made with a polarized light microscope. The reached results are divided in scales. In a macro-scale, the environment of the archeological site, it was acquired the stratigrafic register of the fluvial terrace that is substrate of the and the description of tree types of soil inside site and other two in the outside of the Conjunto Vilas. In meso-scale, the units f excavation, it was established some depositional and post-depositional process associated to the archeological horizons and features that has enabled interpretations of formations processes. In micro-scale, or in the micro-contexts observed in thin sections, the compositional and structural data allowed the development of microfacies that was associated with the interpreted processes in meso-scale. Lastly, it is still proposed a model that tries to explain the formation processes of Conjunto Vilas site based on some formulated therories and the data of the research Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2015-09-18T00:00:00Z