Publicação: Tectonica do Complexo Varginha na regiao de Sao Joao da Boa Vista (SP)
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Migmatites, high-grade gneisses and granitoids represent the most important Precambrian rocks of Sao Joao da Boa Vista region. Structures are interpreted as due to low-angle oblique non-coaxial ductile shear, developed under conditions of amphibolite facies. Transcurrent ductile shear zones and associated drags modify the foliation and lineations orientations. A first phase of migmatization related to anatexis seems to be developed before or early during the thermo-tectonic process. A second one is syntectonic, and represents the main regional phase. Joints and faults represent the brittle features, the faults marked by cataclastic rocks and intense retrometamorphism along the main zones. -from English summary
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ductile shear, metamorphism, migmatization, polyphase deformation, structural framework, tectonics, Brazil, Sao Paulo, Sao Joao da Boa Vista, Varginha Complex
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Português
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Geociencias, v. 9, p. 35-54.
