The Piúma lineament, southern Espirito Santo : structural expression and tectonic significance.
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2016
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Resumo
The Piúma lineament, located in the Southern
Espírito Santo State, Brazil, is one of the most prominent linear
morphostructural features of the northern Mantiqueira Province.
The lineament stands out in satellite images and topographic
maps, extending for about 70 km in a N50°W direction, between
the towns of Iconha and Conceição do Castelo (Espírito Santo).
In order to investigate the nature and role played by the Piúma lineament
in the tectonic evolution of the Mantiqueira Province and
adjacent Campos Basin, we carried out a detailed structural analysis
based on fieldwork, as well as geophysical data processing and
interpretation. The results we obtained indicate that the Piúma
lineament is a brittle shear zone characterized by N50W-trending
and SW-dipping shear fractures, faults and joints. These structures
record two distinct and incompatible motions, thereby recording
the operation of two tectonic regimes: NNE-SSW extension and
E-W transtension. Comparing our results with the literature on
the Southeastern Brazilian Continental Margin, we conclude that
the Piúma lineament more likely developed after the Ediacaran
Brasiliano orogenic event in response to an NNE-SSW extension,
experiencing later a reactivation as normal dextral to dextral
transtensional zone, probably in connection with the South Atlantic
rifting in the Lower Cretaceous.
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Remote sensing, Fractures, Paleostress analysis
Citação
LOURENÇO, F. S. et al. The Piúma lineament, southern Espirito Santo: structural expression and tectonic significance. Brazilian Journal of Geology, v. 46, p. 531-546, 2016. Disponível em: <http://www.scielo.br/scielo.php?pid=S2317-48892016000400531&script=sci_abstract&tlng=en>. Acesso em: 25 ago. 2017.