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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The Mato Perso Conduit System: evidence of silicic magma transport in the southern portion of the Parana-Etendeka LIP, Brazil

Texto completo
Autor(es):
Simoes, Matheus Silva [1, 2] ; de Lima, Evandro Fernandes [1] ; Sommer, Carlos Augusto [1] ; May Rossetti, Lucas de Magalhaes [1, 3]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Fed Rio Grande do Sul, Inst Geociencias, Programa Posgrad, Porto Alegre, RS - Brazil
[2] Serv Geol Brasil CPRM, Manaus, Amazonas - Brazil
[3] Univ Aberdeen, Dept Geol & Petr Geol, Aberdeen - Scotland
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: BRAZILIAN JOURNAL OF GEOLOGY; v. 48, n. 2, p. 263-281, APR-JUN 2018.
Citações Web of Science: 1
Resumo

The Mato Perso Conduit System is described from a similar to 120 km(2) area in south Brazil exposing silicic volcanics of the Parana-Etendeka LIP. A volcanic succession is defined by basaltic flows covered by flat-lying oxidized vitrophyres, banded vitrophyres cutting the lower lavas and grey flat-lying vitrophyres covering all the units. Flow morphologies determined by the recognition of structures, textures, and vesicle distribution were observed. Oxidized vitrophyres display massive flat-lying banded cores and flow tops from vesicular to frothy. Grey flat-lying vitrophyres have sharp contacts in the top of both basalt flows and oxidized vitrophyres, locally exhibit basal breccia and have a flat-lying foliation. Conduits are represented by banded vitrophyres and breccias, which outcrop in a 6 km wide, NW-SE oriented segment downthrown by normal faults towards the Antas River. The interpretation of the units on the geological map scale indicates intrusive contact relations. Recognition of dike-like structures in banded vitrophyres and dykes of oxidized vitrophyre are evidence of felsic magma transport. Based on field observations, we propose the emplacement of subaerial oxidized and grey vitrophyres fed by a fault-related conduit system. Sustained high temperature magmatic systems ensure the silicic lavas have a low viscosity and travel great distances. (AU)

Processo FAPESP: 12/06082-6 - A província magmática Paraná-Etendeka no Brasil: relações temporais e petrológicas entre o magmatismo toleítico e alcalino e suas implicações geodinâmicas
Beneficiário:Excelso Ruberti
Linha de fomento: Auxílio à Pesquisa - Temático