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Refining the chronostratigraphy of the silicic magmatism of the Paraná Magmatic Province using the zircon U-Pb chemical abrasion (CA-ID-TIMS) dating technique

Grant number: 17/18220-8
Support type:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): January 07, 2018
Effective date (End): April 06, 2018
Field of knowledge:Physical Sciences and Mathematics - Geosciences
Principal Investigator:Valdecir de Assis Janasi
Grantee:Brenda Chung da Rocha
Supervisor abroad: Urs Schaltegger
Home Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Local de pesquisa : Université de Genève, Switzerland  
Associated to the scholarship:16/23266-4 - Age and duration of acid magmatism in the Paraná Magmatic Province from 40Ar-39Ar sanidine and U-Pb zircon and baddeleyite dating, BP.PD

Abstract

The Paraná-Etendeka Magmatic Province (PMPE) is one of the world's largest LIPs, with up to 1,000,000 km3 of preserved volcanic rocks, and is related to breakup of Gondwanaland during the Lower Cretaceous. Silicic volcanic rocks (Chapecó and Palmas types) preserve the largest volume (ca. 45,000 km3, of which 15,000 km3 in Brazil) among other continental flood basalt provinces, and are present as units of different composition (dacitic to rhyolitic; with high and low Ti contents) in distinct stratigraphic positions. The proposed project aims to determine high-precision zircon U-Pb ages using the CA-ID-TIMS technique in selected samples of silicic volcanic rocks from previous stratigraphic studies. CA-ID-TIMS is the most precise (0.1% uncertainties) U-Pb geochronology technique currently available, which is required for determining the timescales of magmatic pulses in LIPs and linking geological events at a global scale. This project will be carried out at the University of Geneva (Switzerland), under the supervision of Professor Urs Schaltegger, an expert in high-precision U-Pb dating of accessory minerals to determine the timescales for the formation of LIPs. The application of the CA-ID-TIMS dating technique would be critical to determining the timing and duration of silicic magmatism in key stratigraphic units of the PMPE, which will be combined with sanidine 40Ar/39Ar ages, allowing a refinement of the chronostratigraphy of the province. The present proposal is of great importance in reconstructing the geological time scale and can provide a solid contribution to the desired cross-calibration of the two methods in this period (Lower Cretaceous) of the Earth's history.