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Understanding the climate-tectonic interaction in Western Amazonia (Acre Basin) during the Quaternary using luminescence techniques

Grant number: 19/20588-9
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): January 01, 2020
Effective date (End): December 31, 2021
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal researcher:André Oliveira Sawakuchi
Grantee:Ian Aitor Del Rio Garcia
Home Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:18/15613-1 - Topographic construction along the northeastern Andes and the origin of the Transcontinental Amazon Basin, AP.JP2

Abstract

Though some numerical ages are available for the Quaternary sedimentary record for the Solimões and Amazonas Basins, the Quaternary stratigraphic record and its timing in the Acre Basin is poorly known. This is critical to evaluate if landscape changes driven by tectonics and/or climate influenced species distribution in Amazonia during the Quaternary, the critical period for biotic diversification. To understand the relationship between tectonism and climate and their role for landscape changes in lowland Amazonia during the Quaternary, it is mandatory to obtain a detailed chronology of the sedimentary record and the sediment source areas that allow to correlate the studied sedimentary deposits from the Acre Basin with nearby basins and tectonic phases. With this post-doctoral proposal, we aim to use different luminescence signals to produce a detailed age model of the sedimentary record from selected locations in the Acre Basin and to obtain exhumation rates from the sediment source areas from the Andes. This will be accomplished collecting samples from outcrops and from drill cores extracted under the "Trans-Amazon Drilling Project" (International Continental Scientific Drilling Project, ICDP). For determination of sedimentation ages, we will use diverse luminescence dating techniques, including dating protocols recently developed, that allow to increase the age limit of the dating method to time scales of 105 to 106 years. Low temperature thermochronology analysis using luminescence signals from bedrock samples from the Andes Cordillera and from samples collected during drilling will provide exhumation and subsidence rates for the Andes Cordillera and the Acre Basin, respectively, for the Quaternary. (AU)