Other
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..917m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 4, pp.917-922
Other
9
Scientific paper
The K-Ca radioactive parent-daughter system provides a tool for tracing the origins of igneous rocks. It is complementary to other isotopic systems because as stoichiometric constituents of major minerals, the concentrations of K and Ca, and the K/Ca ratio in rocks, are simply related to mineralogy. In this paper we report the first high-precision calcium isotopic analyses of continental granitic rocks, island arc rocks, and mid-ocean ridge basalts. These data show that mid-ocean ridge basalts have the low 40 Ca / 42 Ca ratios expected for the Earth's mantle, but that island arc rocks have slightly higher 40 Ca / 42 Ca ratios indicative of crustal calcium in their magma sources. Many granitic rocks have high initial 40 Ca / 42 Ca ratios, and in conjunction with independent evidence for the age of the crustal sources, these ratios provide constraints on the K/Ca ratios, and in turn on the silica contents and residual mineralogy, of the deep crustal magma sources.
Depaolo Donald J.
Marshall Brian D.
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