Year-end Sale % OFF 
Abstract
The Sanfranciscana basin is a wide intracratonic basin sub-divided in Abaeté sub-basin and Urucuia sub-basin which includes four Groups of Neo Paleozoic to Neo Cretaceous ages, among them there is the target of this study, the Urucuia Group (Upper Cretaceous). The Urucuia Group has the largest rock volume and areal distribution of the basin. Its rocks constitute two Formations, the basal named Posse overlaid by Serra das Araras Formation. In a continental environment where there is a few fossil contents, the paleosol study can bring important information about climatic and geomorphologic conditions, and biological activity being possible to do an environmental reconstruction. Therefore, this project aims to elaborate a paleoenvironmental model to the Upper Cretaceous of the Sanfraciscana basin through facies analysis and paleosol characterization. The fieldwork was accomplished in the outcrops of the Urucuia Group situated near to São Domingo (GO) town. Outcrop descriptions, photographic registration, and sample collection to laboratory analysis were the methodology applied. The outcrop description was made by the identification of lithologies, textures, sedimentary structures, paleocurrents, fossil content, bed geometry, as well as paleosol macromorphologic description.
Highlights
The Sanfranciscana basin is an intracratonic basin elongated in the N-S direction situated in the centralnorth area of Brazil
There are scarce studies about this Group, for this reason the present study accomplished a detailed facies analysis and a paleosol macro characterization of the Formations of the Urucuia Group in its outcrops located in the Goias state aiming to detailed depositional and pedogenetic aspects which can contribute to the understanding of the depositional environment during the Late Cretaceous
Four lithofacies composed of fine to medium tabular sandstones with trough cross stratification; gravelly sandstones with fine to coarse granulometry, granules and pebbles imprint the forsets and the coset bases, concave geometry filled by smooth concave and tabular bars, trough cross stratification sometimes occurring as festons, wave and plane parallel laminations are less common; these sandstones are in part massive; red massive mudstones with desiccation cracks feature; and two paleosol profiles with sandy and massive aspect was obtained as a result of this study
Summary
Introduction The Sanfranciscana basin is an intracratonic basin elongated in the N-S direction situated in the centralnorth area of Brazil. It represents the Phanerozoic cover from Sao Francisco Craton, and it can be sub-divided in Abaeté sub-basin na Urucuia sub-basin[1, 2] which includes four Groups (Neo Paleozoic to Neo Cretaceous) 1. Among these there is this study target, the Urucuia Group (Upper Cretaceous).
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Revista dos Trabalhos de Iniciação Científica da UNICAMP
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
