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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Lucas Martins Lino [1] ; Francisco de Assis Cavallaro ; Silvio Roberto de Farias Vlach [3] ; Daniel Cunha Coelho [4]
Total Authors: 4
Affiliation:
[1] Universidade de São Paulo. Instituto de Geociências - Brasil
[3] Universidade de São Paulo. Instituto de Geociências - Brasil
[4] Universidade de São Paulo. Instituto de Geociências - Brasil
Total Affiliations: 4
Document type: Journal article
Source: BRAZILIAN JOURNAL OF GEOLOGY; v. 48, n. 2, p. 305-315, 2018-06-00.
Abstract

ABSTRACT: The Limeira Intrusion is an occurrence related to the Mesozoic continental flood basalts of Paraná Magmatic Province, cropping out at the eastern São 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)

FAPESP's process: 12/06082-6 - The Paraná-Etendeka magmatic province in Brazil: temporal and petrologic relationships between the tholeiitic and alkaline magmatism and geodynamic implications
Grantee:Excelso Ruberti
Support Opportunities: Research Projects - Thematic Grants