Clinopyroxene-matrix partitioning of K, Rb, Cs, Sr and Ba

Details Clinopyroxene-matrix partitioning of K, Rb, Cs, Sr and Ba Clinopyroxene-matrix partitioning of K, Rb, Cs, Sr and Ba

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38.1799h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 12, pp.1799-1806

Physics

36

Scientific paper

Extremely pure samples of clinopyroxene phenocrysts from two volcanic rocks have been analyzed for K, Rb, Cs, Sr and Ba. In conjunction with matrix concentrations, partition coefficients are obtained which are in the range 0.001-0.004 for K, Rb, Cs and Ba. These values are lower than those in the literature by factors of 6-100 but are in good agreement with values determined experimentally at pressures of 15-30 kb by Shimizu ( Geochim. Cosmochim. Acta 38 , 1974). Values for partition coefficients measured on separates of impure or cloudy pyroxenes from these same rocks were higher and similar to those in the literature. We suggest this effect is related to `trapping,' during crystal growth, of liquid which is enriched in the larger ions (such as Rb and Cs) due to lack of diffusion equilibrium in the liquid. Partition coefficient values for olivine and plagioclase from one of these same rocks were also determined.

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