Banca de DEFESA: JOÃO PEDRO MORENO GOMES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JOÃO PEDRO MORENO GOMES
DATA : 07/12/2020
HORA: 09:00
LOCAL: https://conferenciaweb.rnp.br/webconf/colegiado-de-pos-graduacao-em-geologia-ufba
TÍTULO:

Coastal Province mafic Dykes, State of Bahia: Comparative study with Ilhéus-Olivença

PALAVRAS-CHAVES:

geochemistry, petrography, dykes swarms, basaltic magmatism.

PÁGINAS: 61
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
SUBÁREA: Geologia
ESPECIALIDADE: Petrologia
RESUMO:

Comparative studies of petrographic, geochemical and geochronological data of mafic dykes allow establishing relationships among different swarms, their processes of genesis and magmatic evolution, contributing to the geodynamic evolution of a given region and the characterization of the nature of mantle sources of extensional events. The mafic dikes of Ilhéus-Olivença, Salvador, Camacan and Itajú do Colônia, belonging to the Coastal Province (PL), are located in the northeast of the Francisco Cráton, close to the sea coast of Bahia and emplaced in granulitic rocks of paleoproterozoic orogenic belts. The Ilhéus-Olivença swarm has dikes with average thickness of less than 3 m, with preferential E-W orientation and host rotated enclave structures, with magmatic flow directed from east to west. The essential mineralogical assembly is composed of plagioclase, pyroxenes, olivine, hornblende and opaque minerals, presenting intergranular, ophitic, porphyritic and subophitic textures, besides secondary alteration processes. They are tholeiitic basalts of intra-plate setting, with slight enrichment in ETRL compared to ETRP, showing an E-MORB source, with samples close to the primitive mantle. When compared with the other mafic dykes of PL, they have similarities in terms of field, petrographic and geochemical aspects. The integration of geochemical studies with geochronological data from the PL literature reveals that these rocks are part of the same extensional Tonian event, probably related to the same mantle plume.

MEMBROS DA BANCA:
Presidente - 1295799 - ANGELA BEATRIZ DE MENEZES LEAL
Interno - 2982944 - JAILMA SANTOS DE SOUZA DE OLIVEIRA
Externo à Instituição - ANA CAROLINA PINHEIRO AMORIM - IFBA