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Linking in-situ U-Pb dating in accessory minerals using LA-ICP-MS with P-T data in high-grade metamorphic rocks of the Socorro-Guaxupé nappe

Grant number: 14/05563-6
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): August 18, 2014
Effective date (End): August 05, 2015
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal Investigator:Renato de Moraes
Grantee:Brenda Chung da Rocha
Supervisor: Andreas Moeller
Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: University of Kansas, United States  
Associated to the scholarship:12/22380-7 - Origin and evolution of melting in the migmatites and granulites of the Socorro-Guaxupé Nappe, in the Alfenas region (MG), BP.DR

Abstract

One of the major challenges in metamorphic petrology is to link the growth of accessory phases such as zircon and monazite, which provides the age information, to the key metamorphic assemblage from which P-T information is extracted. Although zircon and monazite are commonly used minerals for U-Th-Pb geochronology, due to their singular chemical stability during igneous and metamorphic processes and their high closure temperatures, they might be consumed during the metamorphic peak. Inclusions of metamorphic minerals in zircon and monazite can provide a direct link between dating and metamorphism. The study of trace element composition of zircon and monazite can also be used to relate their growth to an association of major metamorphic minerals, providing evidence for the different growth episodes of zircon and monazite, and are combined with geochronological data to establish P-T-t evolution paths. These approaches will be used in this present investigation, granulites and migmatites of the Socorro-Guaxupé Nappe, MG, in which zircon and monazite occur in several rock types and in different textural settings. Dating and trace element analyses will be carried out at The University of Kansas, USA, under the supervision of Prof. Dr. Andreas Möller, an expert in linking age information from in-situ isotopic dating to distinct episodes of metamorphism and melting to reconstruct the evolution of orogenic belts. The approach used by the Professor Möller, which includes in-situ isotopic and trace element analysis within petrographic thin sections, allows maintaining control on the textures that provide relative time information. (AU)

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