Open AccessHIBRIDIZAÇÃO MAGMÁTICA NO PLÚTON QUIXABA NW DO DOMÍNIO RIO PIRANHAS-SERIDÓ: UM ESTUDO TEXTURAL QUANTITATIVO E QUALITATIVO
Author(s) -
Caio de Freitas Tavares,
Carlos Vinícius Alves Ribeiro,
Armando Lucas Souza de Oliveira,
Frederico Castro Jobim Vilalva,
Antônio Carlos Galindo
Publication year - 2020
Publication title -
estudos geológicos
Language(s) - English
Resource type - Journals
ISSN - 1980-8208
DOI - 10.18190/1980-8208/estudosgeologicos.v30n1p3-18
Subject(s) - geology , humanities , geochemistry , art
The Quixaba Pluton is an Ediacaran age batholith outcropping more than 100 km2 in a NE-SW trend, located within the Rio Piranhas-Seridó Domain (Setentrional portion of the Borborema Province). This pluton is composed by two main facies, Quixaba and Umari. The predominant facies is the Quixaba composed by coarse equigranular pink monzonitic rocks. The Umari facies is composed by the equigranular dioritic rocks in the central part of the Quixaba Pluton as a semi-circular intrusion with main axis E-W trending. This dioritic rocks presents two pyroxenes, ferrossilite and diopside, and subsolidus amphibole of grunerite and hornblende composition. Rocks of hybrid composition between both facies, as well the presence of mafic magmatic enclaves, like rapakivi texture, quartz ocelli, mixed apatites, synneusis and mafic clots indicate coexistence and local mixture processes between the monzonitic magma dioritic magmas.