Abstract
The Ribeira Shear Zone, in the homonymous valley, Southeastern Brazil, is a dextral transcurrent, east-northeast trending structure that cuts metasedimentary and metabasics rocks of the Acungui Supergroup and granitic plutons. Petrographic and microstructural data indicate a long deformational history of the shear zone that is characterized by mylonites formed under amphibolite (500°-600°C) to greenschist (300°-400°C) facies conditions, followed by formation of breccias. A clearly spatial distribution of the mylonites of different metamorphic degrees indicate that the Ribeira Shear Zone had a fundamental role in the metamorphic and structural zoning of part of the Acungui Supergroup and correlated units. A vertical displacement about 3,5-4,4 km is inferred between the neighboring tectonic blocks.
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