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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.)

2D magnetometric modeling of a basic-intermediate intrusion geometry: geophysical and geological approaches applied to the Limeira intrusion, Parana Magmatic Province (SP, Brazil)

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Autor(es):
Lino, Lucas Martins [1] ; Cavallaro, Francisco de Asis [1, 2] ; de Farias Vlach, Silvio Roberto [1] ; Coelho, Daniel Cunha [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Geociencias, Sao Paulo, SP - Brazil
[2] Univ Sao Paulo, Dept Engn Civil, Sao Paulo, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: BRAZILIAN JOURNAL OF GEOLOGY; v. 48, n. 2, p. 305-315, APR-JUN 2018.
Citações Web of Science: 0
Resumo

The Limeira Intrusion is an occurrence related to the Mesozoic continental flood basalts of Parana Magmatic Province, cropping out at the eastern Sao Paulo state. It is made up of basic-intermediate rocks with a great diversity of structures, textures and modal compositions, related to specific evolutionary process in a magma chamber. Previous geological and stratigraphic evidence suggests it has a lopolithic-like geometry rather than a conventional sill-like, assumed for most regional similar occurrences. 2D forward modeling of magnetometric data, based on available aerial and newly obtained ground data integrated with in situ rock magnetic susceptibility measurements, were used to test such hypothesis. The results, even considering intrinsic drawbacks of magnetometric theoretical models, are compatible with the geologic-based presumed intrusion geometry. The determination of intrusive bodies geometry is quite significant to explain their different emplacement mechanisms. In the case of Limeira Intrusion, the results suggest that the emplacement mechanism may occur, apparently, by inner- accretion of fresh magmatic pulses in its central region. Importantly, the magmatic evolution of lopolith-like basic-intermediate intrusions may open the way for extensive differentiation processes, with strong implications to petrology and metallogenesis. (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