TECTÔNICA DE NAPPES NA REGIÃO DE OURO FINO, CONCEIÇÃO DO MATO DENTRO, MG

PEDRO ANGELO ALMEIDA-ABREU, NILZA HELENA QUINTÃO, VASSILY KHOURY ROLIM, FRANCISCO ROBÉRIO DE ABREU, PIERRE MUZZI MAGALHÃES

Resumo


The region around the District of Ouro Fino (Conceição do Mato Dentro, MG) is located on the southeastern border of the Espinhaço mountain range, where granite-gneissic (Basal Complex) and low grade metasedimentary rocks can be found (Metasedimentary Sequences I and II). Fine to coarse clastic rocks (phyllites, quar tzites, metacon glomerates) dominate in these sequences. Basic metavolcanic rocks are less frequent. The rocks in this region are intensively deformed showing a strong tangencial, with mass transport from east to west shown by the general recronic structures, syn-mylonitic foliation parallel to S0 and also by smaller structures like pressure shadows, grain rotation, S and C surfaces, stretching Iineation, among others. The type of the deformation is non-coaxial and heterogeneous. The tectonic stacking of similar stratigraphic uniti es, individualized by slices of gneissic mylonitic rocks, charac terize structures fonned by nap pe- tectonics.


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