MICROFÁCIES DE SEDIMENTOS CLÁSTICOS

J. M. MABESOONE

Resumo


The concept of microfacies as proposed hy Carozzi has been a pplied for non-fossiliferous, clastic sediments, taking as an example the Piranhas Formation of the Rio do Peixe basin. A great number of detailed microfacies types has been distinguished by determination in thin section of petrography, diagenesis, medium size, morphometry, micro-structures and maturity of sandstones, and as far as possible also of siltstones, claystones and shales. These detailed microfacies have been grouped into five composed microfacies. Interpreting the occurrences of samples in the studied section and the composed microfacies to which they belong, permitted the conclusion of a deposition in a piedmont - alluvial fan environment, in five successive rhythms.

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