Publicação:
Geology and geochemistry of intrusive suite serra da providência granite rocks of Juína Region, Northwest of Mato Grosso State

Nenhuma Miniatura disponível

Data

2020-01-01

Orientador

Coorientador

Pós-graduação

Curso de graduação

Título da Revista

ISSN da Revista

Título de Volume

Editor

Tipo

Artigo

Direito de acesso

Resumo

The granitic rocks associated to the Serra da Providência Intrusive Suite occur in Juína city vicinity, in the extreme northwest of Mato Grosso State, and are located southwest of the Amazon Craton, in the Rondônia-Juruena Province, Roosevelt-Aripuanã Domain. There are intrusive rocks in Roosevelt Group meta volcanic-sedimentary sequence lithotypes, and assemble small igneous bodies, besides a main batholith of elongated form in E-W general direction, with remarkable rapakivi textured features, here denominated Juína Granite Batholith. The porphyritic rosy to light ash color syeno- to monzogranites predominate, presenting rapakivi potassium feldspar phenocrysts of up to 5 cm, inserted in dark thick granulation and rich in biotite and rare hornblend matrix, which allows the identification of leuco- to melagranites varieties. Gray and pink inequigranular rocks of medium to coarse granulation and coarse equigranular, besides aplitic and pegmatoid features are identified. It is observed a strong deformation, imposing diverse lithological varieties, mylonitic banded and porphyroclastics textures. These are ferrous granitoids, A type, metaluminous to peraluminous, calcium-alkaline from the high potassium to shoshonite series, post-collisional to anorogenic and to arc tectonic in an intraplate environment.

Descrição

Idioma

Português

Como citar

Geociencias, v. 38, n. 2, p. 331-347, 2020.

Itens relacionados

Unidades

Departamentos

Cursos de graduação

Programas de pós-graduação