Textures and compositional variations of mafic and accessory minerals in selected granite samples from the Mandira Massif, Graciosa Province, São Paulo State

• Grant number: 09/04321-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2009
• End date: May 31, 2010
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Silvio Roberto Farias Vlach
• Grantee: Caio Arthur Santos
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The project proposes the study of selected granite samples from the Mandira Massif, Graciosa Province of "A-type" granites and syenites, Southern region of the São Paulo State. The objective is the analysis of representative samples of the main rock varieties of the massif, emphasizing the textural and micro-structural relationships between the mafic and accessory minerals and their chemical compositional variations through time. The main tools to be used are optical microscopy, electron microscopy (BSE imaging), and electron microprobe analysis(energy and wavelength dispersion spectroscopy, EDS and WDS).The results will allow the identification of mineral crystallization sequences and the quantification of mineral compositional variations, as well as the calculation of intensive crystallization parameters and the evaluation of the sin-, late- and post-magmatic evolutionary paths of the host rocks. The later will be compared with those recognized in other plutons from the province.

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)

SIACHOQUE, ASTRID; SANTOS, CAIO A.; VLACH, SILVIO R. F.. Amphiboles and phyllosilicates in the A-type Mandira Granite Massif, Graciosa Province, SE Brazil: Textures, composition and crystallisation conditions. MINERALOGICAL MAGAZINE, v. 85, n. 5, p. 784-807, OCT 2021. (08/00562-0, 19/17343-4, 09/04321-0)