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Geochronology for evaluation of stream PIRACY processes: application in sediments of dry valleys of GUARATUBA(SP)

Grant number: 16/06654-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): June 01, 2016
Effective date (End): May 31, 2019
Field of knowledge:Physical Sciences and Mathematics - Geosciences
Principal Investigator:Déborah de Oliveira
Grantee:Natália Nunes Patucci
Home Institution: Faculdade de Filosofia, Letras e Ciências Humanas (FFLCH). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

River captures are related to drainages rearrangements processes and occur when part of a course of a river channel moves to join another channel, causing a "Pirated drainage". The phenomenon affects the regional and local morphogenesis, as well as leave observable features in the landscape that allow evaluate the evolution of the process, such as: elbows of capture , dry valleys , beheading, ruptures in the longitudinal profiles, laps, gravel and mineralogical and morphoscopy gravels correlations. The research aims to investigate the different materials of soil formation of the dry valleys of the Guaratuba River (region between the rivers drainages of Guaratuba and Claro through absolute dating using Optically Stimulated Luminescence method (OSL) and radioactive isotopes (14C) in order to assign specific periods of landscape evolution, the origin of these features. Macromorphological, granulometric, morphoscopic and mineralogical aspects of the Dry Valleys coverage material will be searched, as well as the ages of the same shall be verified through absolute dating through (OSL) and (14C). Finally, additional statistical analyses, specifically multivariate and trends, will be applied in the results to analyze the main components (PCA) results. The systemic environmental assessment in conjunction with the use of the proposed methods will develop a pedological/ sedimentological study approaches, that relate the genesis of surface coverage of dry valleys, its chronology and spatial distribution to the process of river piracy.