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Revista Brasileira de Geociências
Article . 2009 . Peer-reviewed
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Lineações minerais em porfiroblastos

Authors: Frederico Guilherme Guaraldo de Andrade; Luiz Sérgio Amarante Simões;

Lineações minerais em porfiroblastos

Abstract

The study of mineral lineations has been of fundamental importance in the comprehension of tectonic evolution in orogenetic belts. However, in polydeformated areas, while the newest lineation’s orientation can be found, the oldest lineations tend to be obliterated by the newest deformation events. This article launches a new methodology to the rescue of mineral lineations’ orientation included within porphyroblasts, using the Universal Stage. The main objective is the rescue of preferential orientation of mineral lineations included within porphyroblasts, to determine the strain directions of an older deformation, whose structures in the matrix had been obliterated by a newer deformation event. Considering several possibilities of modifications in the original orientations of a lineation that had been included within a porphyroblast, can be concluded that the rescue of the original orientation can be possible in syntectonic porphyroblasts, in well-developed early tectonic parts, or intertectonic porphyroblasts. The aplication of the metodology in the southern part of elephant island (Antarctica) show that the lineations rescued within porphyroblasts show an orientation pattern different from the mineral lineation on the matrix (L 2 ), corroborating the interpretation that they correspond to L 1 , and indicating that the preffered orientation of L 1 is aproximately NNW, coherent with the tectonic model proposed to this area. The consistence of the results obtained attests the effectiveness of the method.

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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