Physics
Scientific paper
Aug 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38.1287d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 38, Issue 8, pp.1287-1296
Physics
2
Scientific paper
Initial isotopic ratios of strontium have been determined in some calc-alkali rocks of Sardinia. The values of these ratios are from 0.7044 and 0.7047 in two basalts, and from 0.7063 to 0.7081 in five andesites. A dacite and a rhyolite have intermediate values of 0.7056 and 0.7058. It is suggested that increase of radiogenic strontium in andesite is most likely related to a contamination process involving water expelled from an underthrusting plate. This water also contributes to the increase in the potassium and related trace element contents in andesites. In spite of the 87 Sr / 86 Sr difference between basalt and andesite, a cogenetic relationship between these two kinds of rocks cannot be precluded
Coulon Christian
Dupuy Christophe
McNutt Robert H.
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