Evolution study of the Barreiras group in the Campos Basin by fission-track thermocronology and U-Pb in zircon

• Grant number: 17/16522-7
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): October 01, 2017
• Effective date (End): September 30, 2018
• Field of knowledge: Physical Sciences and Mathematics - Geosciences
• Principal Investigator: Airton Natanael Coelho Dias
• Grantee: Thais Pereira Rosinha de Oliveira
• Home Institution: Centro de Ciências e Tecnologias para a Sustentabilidade (CCTS). Universidade Federal de São Carlos (UFSCAR). Sorocaba , SP, Brazil

Abstract

Zircon is a common accessory mineral in igneous, sedimentary, and metamorphic. It is physically and chemically resistant and can "survive" for many geological periods, and in many cases, provides a record of each geological event which was submitted in these periods. Incorporates in its structure trace elements such as U, Th and Pb, which is crucial for geochronological analyzes. Its ability to retain information about the thermal history of a source area is of invaluable value to elucidate the geological processes arising from a variety of geodynamic settings. Consequently, Zircon Fission Track Thermochronology (ZFTT) has been extensively used in combination with other methods of radiometric dating, such as U-Pb and U-Th/He to understand the geo and thermochronology of rocks in a variety geological environment: orogenic basement rocks, thermochronology using detrital grains in sedimentary rocks for analysis of provenance and thermal history analysis. The objective of this project is to apply the FTT and U-Pb in zircon samples (and apatite, if possible) of the Barreiras Group in the Campos Basin to help understand the evolution of the region adjacent to the continental margin in the southeast, especially the distribution of the source rocks of the detrital sediments. The low temperature thermochronological analysis may provide information on the development of the Brazilian continental margin, such as the formation of the Mantiqueira and Serra do Mar ranges, the interior basins and the oil systems of the margin basins. It is also emphasized that through these studies, there is the possibility of further scientific advances in the methodological part and the TTF application in zircon, which will allow an amplification in the use of the technique by the Brazilian scientific community for the reconstruction of the thermal history of other areas of interest geological. (AU)