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Monazite generation processes in high-pressure felsic granulites from the Carvalhos Klippe (Southern Brasília Orogen) and implications for petrochonology

Grant number: 23/17836-6
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): September 01, 2024
Effective date (End): June 30, 2026
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal Investigator:Brenda Chung da Rocha
Grantee:Lorena de Toledo Queiroz
Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Monazite ([ETRL, Th] PO4) is a commonly used petrochronometer in metamorphic rocks due to its ability to record the timing of prograde and retrograde metamorphism and its association with metamorphic reactions. Despite being extensively studied in (ultra) high-temperature metamorphic rocks, the behavior of monazite in high-pressure rocks has been poorly described in the literature, sparsely described in the literature, hence preventing a thorough understanding of this key petrochronometer. In the Andrelândia Nappe System, there are significant occurrences of high-pressure felsic granulites (i.e., Carvalhos Klippe) that exhibit varied metamorphic textures, recording metamorphic conditions of approximately 850°C and 14 kbar. This study aims to investigate petrochronology and the processes of monazite generation in high-pressure felsic granulites as a case study in the Carvalhos Klippe, Southern Brasília Orogen, through an integrated approach utilizing thermodynamic modeling, chemical and isotopic data obtained by electron microprobe and LASS-ICP-MS (laser ablation split-stream inductively coupled plasma mass spectrometry) as well as X-ray map compositional maps and LA-ICP-MS compositional maps to understand the mechanisms behind the generation of complex zoning in monazite and its correlations during high-pressure metamorphism.

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