Otro
Tectonica do Complexo Varginha na regiao de Sao Joao da Boa Vista (SP)
Registro en:
Geociencias, v. 9, p. 35-54.
0101-9082
2-s2.0-0025670897
0000-0003-2781-586X
Autor
Morales, N.
Hasui, Y.
Resumen
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