Geology and Petrogenic Evolution of Itatiaia Alkaline Massif, MG-RJ

• Grant number: 12/19184-1
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: December 01, 2012
• End date: January 03, 2017
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Excelso Ruberti
• Grantee: Pedro Augusto da Silva Rosa
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated scholarship(s): 15/19974-0 - Determination and interpretation of intensive parameters of Itatiaia Alkaline Massif, Brazil, BE.EP.DR

Abstract

This project, which will be developed in the Mineralogy and Petrology Post-Graduate Program of Geosciences' Institute - USP, aims the systematic study of the Itatiaia alkaline massive, seeking the refinement of its geology, also petrologic and petrogenetic evolution models. The massif has a wide textural and mineralogical variety, and shows a concentric structure, with an outside part, predominantly composed by unsaturated rocks, syenite and nepheline syenite, and an inner part composed by saturated and supersaturated rocks, quartz syenite, quartz syenite and a small granite body. Also occur magmatic breccias, dikes, both felsic as mafic, and mylonites. To reach the proposed objectives, the project provides, for the revaluation of the complex geology and detail mapping, meticulous petrographic studies, chemical analyzes of the main mineral phases and, possibly, some rare mineral, with electron microprobe and LA-ICPMS; chemical analyzes of major petrographic types, including major, minor and trace elements; isotopic analysis of Sr, Nd, and Pb, and geochronological determinations by Ar/Ar in mineral and, if it´s possible, U/Pb zircon SHRIMP. This examined information, which will be studied together, is fundamental to approaches about the nature of primordial magma generated in the mantle, and igneous processes involved in the evolution of these rocks. Also, it´s contribute with information about the nature of mantle region where these magmas were generated regarding the geochemical signature, ratio of partial melting age and Sm/Nd (CHUR/DM), and geodynamic models of magmatism in the Cabo Frio Magmatic Lineament.

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)

DA SILVA ROSA, PEDRO AUGUSTO; RUBERT, EXCELSO. Nepheline syenites to syenites and granitic rocks of the Itatiaia Alkaline Massif, Southeastern Brazil: new geological insights into a migratory ring Complex. BRAZILIAN JOURNAL OF GEOLOGY, v. 48, n. 2, p. 347-372, APR-JUN 2018. (12/19184-1, 12/06082-6, 15/19974-0)

DA SILVA ROSA, PEDRO AUGUSTO; RUBERT, EXCELSO. Nepheline syenites to syenites and granitic rocks of the Itatiaia Alkaline Massif, Southeastern Brazil: new geological insights into a migratory ring Complex. BRAZILIAN JOURNAL OF GEOLOGY, v. 48, n. 2, p. 26-pg., 2018-04-01. (12/06082-6, 12/19184-1, 15/19974-0)

Academic Publications

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

ROSA, Pedro Augusto da Silva. Geologia e evolução petrogenética do Maciço Alcalino de Itatiaia, MG-RJ. 2017. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Geociências (IG/BT) São Paulo.