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Dating metamorphic processes in the deep continental crust: petrochronology of key UHT and HP units from orogens in Brazil

Grant number: 21/09437-9
Support Opportunities:Regular Research Grants
Duration: April 01, 2022 - September 30, 2024
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal Investigator:Brenda Chung da Rocha
Grantee:Brenda Chung da Rocha
Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated researchers:Bruno Vieira Ribeiro ; Carlos Eduardo Ganade de Araujo ; Caue Rodrigues Cioffi ; Chris Yakymchuk ; Cristiano de Carvalho Lana ; George Luiz Luvizotto ; Joshua Davies ; Mahyra Ferreira Tedeschi ; Renata da Silva Schmitt ; Vinícius Tieppo Meira

Abstract

The integration of metamorphic timescales with pressure-temperature (P-T) information derived from rocks formed in the deep continental crust can provide important insights on the understanding of the evolution of plate tectonics in Earth as a response to the secular cooling and rheological changes over time. The petrochronology approach links time (i.e., ages and duration) with P-T data based on the combination of textural, chemical and isotopic information. This way, the petrochronology approach has been widely used, especially in Phanerozoic orogenic belts, to determine the rate and duration of metamorphic processes to a better comprehension of the formation and evolution of the continental crust. The timing of metamorphic processes is usually constrained by in-situ dating methods (i.e., laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and Ion microprobe). However, the chronological resolution of the in-situ dating techniques is not sufficient to distinguish protracted and short-lived events in Neoproterozoic orogens due to the large uncertainties (~1-2%). This proposal aims to apply an integrated approach using both in-situ (LA-ICP-MS) and high-precision (chemical abrasion-thermal ionization-mass spectrometry - CA-ID-TIMS) U-Pb geochronology techniques. This combined approach will be tested in Neoproterozoic high-grade metamorphic rocks from the Brasília and Araçuaí orogens (SE, Brazil) formed in different metamorphic regimes (i.e., UHT and HP), to determine more precise and reliable metamorphic timescales of the Neoproterozoic deep continental crust to better understand the secular changes in the styles of plate tectonics. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ROSSI-VIEIRA, P. L. N. C.; TEDESCHI, M.; ROCHA, B. C.; LANA, C. C.; BARROTE, V.; PEDROSA-SOARES, A. C.; DUSSIN, I. A.; ALKMIM, A.. Detrital zircon U-Pb-Hf isotopes-based reconstruction of the depositional history of (ultra)high-temperature metamorphic rocks from the Socorro-Guaxup′e Nappe (southern Brasilia orogen, Brazil). Journal of South American Earth Sciences, v. 128, p. 25-pg., . (21/09437-9)

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