Thermochronology by fission track and (U-Th)/He methods in apatite applied in the southeastern portion of the Mogi Guaçu River Basin - SP: considerations about provenance (mineral fertility) and estimates of transport anderosion rates

• Grant number: 22/00401-4
• Support Opportunities: Scholarships in Brazil - Master
• Start date: July 01, 2022
• End date: February 29, 2024
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Carlos Alberto Tello Sáenz
• Grantee: Jaqueline Dickel Bilhar
• Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil
• Associated scholarship(s): 22/13003-7 - Enhancement of the fission-track dating method and trace elements including the rare earth elements (REE) in apatite at Trinity College Dublin - Ireland, BE.EP.MS

Abstract

The present research project seeks to apply Thermochronology in alluvial sediments collectedin the southeastern portion of the Mogi Guaçu River Basin (in the Peixe hydrographic basin), located in thesouthern portion of the Brasília Belt, northeast of the State of São Paulo. Fission-Track (FT) and (U-Th)/He dating methods will be used on apatite mineral in 10 samples to be collected in the study area. Isotopic characterization will be performed using Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) for age determination FT and (U-Th)/He. The data obtained will allow considering the erosionand transport rates of the different lithologies that outcrop in the Peixe sub-basin, as well as tracking the provenance of these sediments and indicating the greatest trends in areas of the basin to provide apatite (mineral fertility). Considering the variation of the closing temperature in mineral apatite in each of the methodologies, it will be possible to carry out a thermochronological analysis that covers determinate period of geological time and to estimate which portions of the relief were more eroded. This study, unprecedented in Brazil, will also contribute to the refinement of the FT and (U-Th)/He methods in geological problems developed by the Research Group on Nuclear Trace Detectors (DETRAN) of the Department of Physics (DF) of the UNESP of Presidente Prudente.