http://hdl.handle.net/11422/55 2026-07-26T06:54:31Z 2026-07-26T06:54:31Z http://hdl.handle.net/11422/29774 2026-07-25T03:00:11Z 2013-12-05T00:00:00Z

Title: Os esfagessaurídeos da Bacia Bauru Author(s)/Inventor(s): Iori, Fabiano Vidoi Advisor: Carvalho, Ismar de Souza Abstract: The Notosuchia was a characteristic and peculiar group in the geological history of the Gondwanic Cretaceous. These crocodylomorphs possessed a very specialized dentition and occurred in several ecological niches. In this context the sphagesaurids present a complex masticatory mechanism adapted for herbivory / omnivory. Four genera have been described for this family: Sphagesaurus, Armadillosuchus, Caipirasuchus and Caryonosuchus, all from the Bauru Basin. This basin is located in south-central South American Platform and consists of Late Cretaceous continental deposits. The descriptions of some sphagesaurids were based on the fragmentary fossils and/or uncompleted preparation; then some morphological characters were incorrectly described. The anatomical reanalysis and the discovery of new specimens allowed the taxonomic revision and annotation of a diagnosis for the family based on the following dental pattern: presence of six sphagesauriform teeth in each maxilla and six on each dentary, each upper tooth with an antagonic tooth in the jaw; premaxilla with a caniniform tooth and another conical tooth posteriorly. Adamantinasuchus possess distinct dentition and chewing mechanism; theses aspects and a phylogenetic analysis exclude it from the family Sphagesauridae. The analysis of new aspects related to chewing on Caipirasuchus corroborated previous proposals for the family, as the proal and unilateral movements of the jaw during the bite. Moreover, it was pointed the function of the diastemata and square-articular joint in the masticatory process. The study of the post-cranium of the Caipirasuchus specimens allowed to estimate that these animals had thin bodies and 1.20 m in length. The analysis of anatomical structures of Sphagesaurus, Caryonosuchus, Armadillosuchus allowed to propose an ecological niche for the Sphagesauridae Publisher: Universidade Federal do Rio de Janeiro Type: Tese

2013-12-05T00:00:00Z http://hdl.handle.net/11422/29445 2026-06-24T03:00:10Z 2015-10-21T00:00:00Z

Title: Análise de sismossequências na Seção Drifte da porção offshore da bacia de Barreirinhas, margem equatorial brasileira Author(s)/Inventor(s): Sampol, Juliana Ferreira Gomes Advisor: Borghi, Leonardo Abstract: Important discoveries made over recent years in the South American (Zaedyus discovery) and African (Jubilee Field) equatorial margins opened new perspectives in the exploration of the Brazilian equatorial margin, particularly for the Barreirinhas Basin. The objective of this study is a first seismic analysis approach for the Drift section of Barreirinhas Basin, in deep water areas, based on the identification, correlation and mapping of the seismic facies, horizons and sequences. The few stratigraphic data available together with the lack of stratigraphic interpretations in the studied area make this study challenging. Five 2D depth seismic lines (Pre-Stack Depth Migration) dip oriented and one strike oriented are located in an approximately 1100km2 area, in the offshore Barreirinhas Basin, were interpreted using Petrel (Schlumberger), and its applications. The analysis of seismic characters, impedance contrast, reflectors’ patterns, and sequence geometries showed nine seismic facies, and ten seismic horizons, which seven of them limit six seismic sequences. Geometries identified by isopach maps of the sequences reveals a stratigraphic pattern of aggradational (seismic sequence 1) to retrogradational (seismic sequences 2, and 3) to progradational (seismic sequences 4 and 5) and finally to retrogradational (seismic sequence 6) which can be associated to transgressive-regressive cycles which allowed attemptive correlation to depositional sequences in the onshore previously proposed by literature Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2015-10-21T00:00:00Z http://hdl.handle.net/11422/29421 2026-06-20T03:00:12Z 2013-03-20T00:00:00Z

Title: Estruturas sedimentares microbianas em arenitos da Formação Sergi (Jurássico), Bacia do Recôncavo, Bahia, Brasil Author(s)/Inventor(s): Avalone, Maiana Cláudia Kreff Advisor: Borghi, Leonardo Abstract: The bosedimentology is a new area of knowledge in geosciences which studies the influence of microbial organisms in sedimentological processes. Within this new area, there are more traditional studies in carbonate rocks, but more recently, a new focus on the genesis of certain structures in sedimentary sandstones and shales that occur from the precambrian to recent has opened new possibilities for studying biosedimentogy in terrigenous sediments and rocks. This study aims to identify the microbial influence in the genesis of some sedimentary structures in eolian sandstones of Sergi Formation, Jurassic of Recôncavo basin. Several structures have been recognized in this formation, similar to those which has been identified in the literature as elephant skin, pinnacles, wrinkle marks, exfoliating sand laminae and domal buildups, and microscopic structures such as laminations with peculiar spatial arrangement of grains and heavy mineral concentration, all which are associated with microbial genesis. The correct diagnosis of these structures not only increases the descriptive capacity of sedimentary lithofacies for the Sergi Formation, as well as the paleoenvironmental interpretative ability of the formation, through the possibility of recognition of humid aeolian depositional systems (paleoenvironments of interdune / sand sheet), that had not yet been hypothesized in the literature of the basin Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2013-03-20T00:00:00Z http://hdl.handle.net/11422/29298 2026-06-10T03:00:09Z 2016-06-14T00:00:00Z

Title: Meteorito Buritizal: classificação de meteorito condrítico brasileiro Author(s)/Inventor(s): Salaverry, Rogerio Nogueira Advisor: Mendes, Julio Cezar Abstract: On 1967 August 14th, the reporter Saulo Gomes, working at TV Tupi, went to a small city in the State of São Paulo called Buritizal to investigate reports of a meteorite fall and write a newspaper report. He actually recovered three fragments of the meteorite at a small farm. In 2014, he donated one of the fragments to the Museu Nacional of the Universidade Federal do Rio de Janeiro (MN/UFRJ). We named this meteorite Buritizal and studied its petrology, geochemistry, magnetic properties and cathodoluminescence with the intent to determine the petrologic classification of the meteorite. In this manner, the Buritizal meteorite is classified as an ordinary chondrite LL 3.2 breccia (as indicated by the lithis fragments it contains. The meteorites consists of ~ 2% of metallic Fe,Ni and many well-defined chondrules with ~ 0.8 mm in average diameter. An ultramafic ferromagnesian mineralogy is predominant in the meteorite, represented by olivine, orthopyroxene, clinopyroxene, Fe-Ni alloy, troilite and glass. The total iron content was calculated as 20.88 wt%. Furthermore, the meteorite was classified as weathering grade W1 and shock stage S3. Buritizal is the 25th observed meteorite fall recovered in Brazil, of 70 meteorites known from Brazil. Thus, the study of the Buritizal meteorite is very important and relevant to the Brazilian scientific community Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2016-06-14T00:00:00Z