Other
Scientific paper
Oct 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35.1005s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 35, Issue 10, pp.1005-1021
Other
15
Scientific paper
Medium- to high-pressure granulite facies rocks from the Brazilian Shield have been geochemically studied in order to investigate the chemical trends and evolutionary processes acting at deep crustal levels. The granulite block considered has an average "intermediate" composition and is significantly depleted in Li and Rb and probably enriched in Sr, Ba (and Zr) by comparison with other crustal materials exhibiting similar overall composition: the average values of the K / Rb (626), K / Ba (20.2) and Rb / Sr (0.094) ratios partially support this interpretation. Some ferromagnesian elements (Mn, Zn, Ti, Cr) seem to determine trends of a marked magmatic type. Assuming that granulites represent residuals of partial melting proc esses, partial melting is seen as both encouraging the attainment of trends of a magmatic type in the residuals, and causing fractionation between elements. A melting mechanism involving several stages and hypotheses concerning the possible composition of the depleted melting fractions are proposed. These hypotheses have a bearing on the genesis of granitic materials.
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