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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.)

Geology, geochemistry and petrology of basalts from Parana Continental Magmatic Province in the Araguari, Uberlandia, Uberaba and Sacramento regions, Minas Gerais state, Brazil

Texto completo
Autor(es):
de Moraes, Lucia Castanheira [1] ; Seer, Hildor Jose [1] ; Marques, Leila Soares [2]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Ctr Fed Educ Tecnol Minas Gerais, Araxa, MG - Brazil
[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Sao Paulo, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: BRAZILIAN JOURNAL OF GEOLOGY; v. 48, n. 2, p. 221-241, APR-JUN 2018.
Citações Web of Science: 2
Resumo

This study covers the region between the cities of Sacramento and Araguari/Uberlandia (Minas Gerais State, Brazil), where basalt flows from the Parana Continental Magmatic Province outcrop. The investigated rocks present tholeiitic signature, with high titanium content, and are classified as Pitanga magma-type. The preserved basalt thickness is between 10 and 200 meters and individual flows do not exceed 15 meters thick. Flows were identified as sheet lobes, smaller and thinner flows units - stacked laterally and vertically forming compound lavas -, or frontal, centimetric lobes. The basalt flows show decimetric to metric intercalations of clastic sedimentary rock, with depositional characteristics that can vary from aeolian to lacustrine, and are important markers on prevailing environmental conditions. The plagioclases are dominantly labradorite and pyroxene is augite, whereas olivine can be hyalosiderite or hortonolite/ferrohortonolite. The behavior of the major, minor and trace elements is compatible with the presence of at least two parental magmas, which were subjected to fractional crystallization mainly of plagioclase, clinopyroxene, ilmenite and magnetite. There is a chemistry distinction between basalts from Sacramento to those from Araguari/Uberlandia region, the former one showing more evolved than the last one. The high (La/Lu) N values are indicative of partial melting of a garnet peridotite, while the Rare Earth Elements (REE) values are indicative of fractional crystallization. (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