Geometria e cinemática na região do Baixo Rio Doce entre Aimorés (MG) e Colatina (ES) [thesis]

Tiago da Rocha Karniol
This work presents microstructural and crystallographic c-axis pattern data in high grade metamorph¡c rocks ¡n the A¡morés (MG) -Colatina (ES) section. Undullatory extinction in many minerals, bent twins in plagioclase, recrystallization ol some minerals, quartz ribbons and chessboard patterns in quaftz are cons¡stent with high temperature deformation path (SS0 -70dC). The c-axis pattern suggests basal prism [c] switch and form type-tt crossed girdles related to non-coaxial deformation. The
more » ... eformation. The kinematic indicators at the microscopic scate indicate compressive toplo-SW-SSW and extensive toplo-NE-NNE movements, suggesting kinematic superpos¡t¡on. The presence of cordier¡te implies a low pressure metamorphism path, poss¡bly related to the exhumation history.
doi:10.11606/d.44.2003.tde-22102015-161526 fatcat:ylgcmfnqt5hsnd3pf6pthl65fi