K / Rb ratios of rocks from island arcs

Details K / Rb ratios of rocks from island arcs K / Rb ratios of rocks from island arcs

Aug 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34..849j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 34, Issue 8, pp.849-856

Computer Science

17

Scientific paper

The abundances of K and Rb have been determined in andesites and shoshonitic rocks from island arcs, inclusions from calc-alkaline rocks and alkali basalts, and in mineral separates from these rocks. Across island arcs there is an increase of K 2 O content with decrease of K / Rb ratio from tholeiites to low-K calc-alkaline rocks, calc-alkaline rocks, high-K calcalkaline rocks and finally to shoshonites. This is explained by the different K / Rb ratios of amphibole and biotite and different mutual proportions of these minerals involved in fractional melting (decomposition) of a sinking slab of oceanic crust undergoing transformation from amphibolite to eclogite.

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