AS ROCHAS ULTRABÁSICAS DA SERRA DO ESPINHAÇO, MG

FRIEDRICH RENGER

Resumo


An alpine-type "serpentine belt", situated in the transition zone between the mioand eugeosyncline of the Pre-cambrian Minas Series in the State of Minas Gerais, Brazil, shows an extension of at least 300 km. From petrographic evidence, a four step evolution and alteration scheme can be deduced:
1 ) peridotite;
2 ) serpentinization;
3) chloritization and amphibolization;
4) talquification + carbonatization.
Some of the ultrabasic bodies show a chromite mineralization with economic possibilities in part. Regional correlations may indicate a major extension of this "serpentine belt", specially to the north, accompanying the quartzites of the Minas Series.

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