Computer Science
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1645r&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, July 1985, p. 1645-1655.
Computer Science
26
Geochemistry, Mineral Deposits, Petrology, Potassium, Rubidium, Thorium, Uranium, Chemical Composition, Depletion, Ion Concentration, Planetary Evolution, Rocks
Scientific paper
A comparison of K, Rb, Th and U concentrations in granulite facies rocks with those of unmetamorphosed common rock types shows that depletion of these elements in granulites is variable. K/Rb ratios for granulites are generally higher than unmetamorphosed rocks, but K/Rb ratios only reach extreme values when K is less than 1 percent. The covariation of K/Rb ratio with K concentration suggests that protolith composition, hence mineralogy, is very important in controlling the degree of Rb depletion in granulites. Felsic granulites exhibiting extreme K/Rb ratios are mainly Archean, reflecting the high abundance of low K felsic rocks in Archean terrains. Felsic granulites with low Th/U ratios also have high La/Th ratios, indicating that these granulites have been depleted in Th. The low Th/U ratios of these rocks may reflect retention of Th and U in resistant accessory phases.
McLennan Scott M.
Rudnick Lawrence R.
Taylor Stephen R.
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