Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, Brazil

Nenhuma Miniatura disponível

Data

2013-06-01

Orientador

Coorientador

Pós-graduação

Curso de graduação

Título da Revista

ISSN da Revista

Título de Volume

Editor

Soc Brasileira Geologia

Tipo

Artigo

Direito de acesso

Resumo

This paper presents new geochemical and petrological data from the southern portion of the Guaxupe Complex. The research area is characterized by the occurrence of migmatites and an intrusive body of charnockitic granite located on the northeastern portion of the area. Petrological and geochemical studies of the banded migmatites have shown that the paleossome is generally composed by tholeiitic basaltic orthogranulite showing island arc signature. Partial melting of these basic orthogranulites has formed calc-alkalic neossome of granitic to tonalitic composition with high SiO2 content (> 68.9%) and high (La/Lu) N ratios, as well as low K/Rb ratios. These features are coherent to partial melting of Rb-rich basic protholits at temperatures around 820 degrees C producing a felsic melt in presence of orthopyroxene and clinopyroxene. Moreover, a geochemical study of a rocks suite from the charnockitic intrusion has pointed out that its evolution is characterized by magmatic differentiation through crystal fractionation process, which, in turn, has formed a magmatic series starting with porphyritic granite, followed by charnockitic gneiss and leucogneiss as the final product of crystal fractionation. These rocks, located geographically close to the magmatic intrusion, must have been formed by partial melting of granulitic crustal rocks of dioritic composition, represented by banded granulitic gneisses with a geochemical signature similar to the magmatic rocks.

Descrição

Idioma

Português

Como citar

Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 43, n. 2, p. 253-272, 2013.

Itens relacionados

Financiadores