Scholarship 23/03949-3 - Geocronologia, Paleoclimatologia - BV FAPESP
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In-situ laser ablation U-Pb geochronology (LA-ICP-MS) of Pleistocene carbonate paleosol

Grant number: 23/03949-3
Support Opportunities:Scholarships abroad - Research Internship - Doctorate (Direct)
Start date until: September 01, 2023
End date until: February 29, 2024
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal Investigator:Giancarlo Scardia
Grantee:João Carlos Cerqueira
Supervisor: Nicholas Michael William Roberts
Host Institution: Instituto de Geociências e Ciências Exatas (IGCE). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil
Institution abroad: British Geological Survey (BGS), England  
Associated to the scholarship:21/10300-8 - Evolution of the Zarqa Valley, Jordan, during the Pleistocene as part of the first hominin migrations outside Africa, BP.DD

Abstract

Carbonate rock can record specific isotopic signatures that can be used to identify its deposition and diagenetic age, in addition to geomorphological and paleoclimatic conditions. Recent studies have been developing a new method for dating carbonate materials, known as solid-state in-situ U-Pb geochronology by Laser Ablation. This method has an important advantage over the traditional liquid-state isotopic dilution analysis, allowing the dating of very small crystals and the elemental mapping of samples, providing identification of geochemical zoning in heterogeneous materials. Although this technique started to be applied in several areas worldwide, in Brazil it is currently undeveloped and not fully implemented. The Institute of Geosciences and Exact Sciences of UNESP has a complete analytical infrastructure for carbonate U-Pb dating, with carbonate reference standards, but the staff has no practical experience in data acquisition and interpretation data produced by this method. Practical training in reputed laboratories such as the Geochronology and Tracers Facility (British Geological Survey) is essential so that the knowledge could be properly transferred to UNESP laboratories and staff and develop an up-to-date facility for in-situ U-Pb dating of carbonates. As part of the internship, samples of carbonate soils collected in the framework of my PhD research from Zarqa Valley, Jordan, will be dated, unraveling the timing and rates of tectonic and/or climatic processes active in the Jordan Rift area, also providing the chronological framework for stable isotope analysis and correspondent interpretations, which will be performed in the future. (AU)

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