Generation of acid magmas in Paraná Magmatic Province: a contribution of isotopic geochemistry and trace elements in minerals by LA-ICPMS

• Grant number: 06/05917-6
• Support Opportunities: Scholarships in Brazil - Master
• Start date: March 01, 2007
• End date: February 28, 2009
• Field of knowledge: Physical Sciences and Mathematics - Geosciences
• Principal Investigator: Valdecir de Assis Janasi
• Grantee: Vivian Azor de Freitas
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The project proposes to model the processes of genesis and evolution of the magmas that formed the Chapecó-type acidic volcanic rocks in the Piraju-Ourinhos (SP). Rock chemistry (including the REE, Th, U and others) and mineral chemistry data previously obtained in the Scientific Initiation of the candidate will be used together with new data that will be obtained in a set of ca. 8 representative samples, and include: (1)microanalysis of trace-elements in phenocrysts and glass by LA-ICPMS; (2) whole-rock Sm-Nd and Rb-Sr isotopy; (3) zircon Lu-Hf isotopy by LA-MC-ICPMS. This robust set of data will allow some models previously elaborated to be refined, quantitatively testing the processes of fractional crystallization and remelting of basalt underplates in one area where basic geological and petrographic information is well-constrained.

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

FREITAS, Vivian Azor de. Acid magma generation in the Paraná Magmatic Province, Piraju-Ourinhos region, state of São Paulo: a contribution of isotopic geochemistry end of trace elements in rocks end minerals. 2009. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Geociências (IG/BT) São Paulo.