PRINCIPAIS GEOBARÔMETROS UTILIZADOS EM GRANULITOS: ANÁLISE DOS RESULTADOS DE UM EXEMPLO DO SUL DA BAHIA - BRASIL

JOHILDO SALOMAO FIGUEIREDO BARBOSA

Resumo


A critical evaluation of the most usual geobarometer schemes on the granulite region of Southern Bahia, Brazil, an area of remarkably uniform metamorphic conditions, revealed that: i, the Wood & Banno and Wood geobarometers are not applicable to the area (highly dispersed results) due to their strong dependence on the bulk chemical composition of the samples (particularly with respect to alumina saturation; ii. the Ellis and Bohlen et al. geobarometers, although producing better values than the previous ones, still slow of signs strong dependence on temperature and composition; and iii. the Newton & Perkins and especially the Wells geobarometers which allow for better consideration of actual garnet, produced the geologically more meaningful pressure values.


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