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Geometry and Kinematics of the Afogados da Ingazeira Shear Zone, Northeast Brazil

2000; Taylor & Francis; Volume: 42; Issue: 1 Linguagem: Inglês

10.1080/00206810009465071

1938-2839

Adejardo Francisco da Silva Filho, Gorki Mariano,

Geochemistry and Geologic Mapping

Abstract Numerous transcurrent NE-SW, mainly sinistral, and E-W dextral-trending shear zones transect Borborema Province, northeastern Brazil. The most important kinematic event involving those shear zones reflects deformation related to the Brasiliano (Pan-African) tectonic cycle. The Afogados da Ingazeira shear zone (AISZ) is probably the most important of the NE-SW-trending lineaments, having continuity for over 250 km. Field work associated with petrographic studies (including quartz c-axis patterns), conducted in an area encompassing the north-central part of this shear zone, indicate that sinistral transcurrent deformation was responsible for the main banding/foliation (C-S) observed in the rocks. Mineral assemblages and microstructural features are suggestive of a deformational history starting under low- to medium-amphibolite facies (thermal peak conditions) and decreasing until greenschist facies.