Charge balancing of trivalent trace elements in olivine and low-Ca pyroxene - A test using experimental partitioning data

Details Charge balancing of trivalent trace elements in olivine and low-Ca pyroxene - A test using experimental partitioning data Charge balancing of trivalent trace elements in olivine and low-Ca pyroxene - A test using experimental partitioning data

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..643c&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, March 1989, p. 643-648.

Computer Science

7

Geochemistry, Ion Exchanging, Metal Ions, Olivine, Trace Elements, Aluminum, Calcium, Iron, Pyroxenes, Silicates

Scientific paper

Charge-balancing substitution mechanisms are determined for the incorporation of the trivalent cations Al and Sc in low-Ca pyroxene and Al, Sc, Yb, and Cr in olivine. In low-Ca pyroxene, the substitution mechanism is determined by evaluating covariations of trivalent trace cations with Si, Mg, Fe, and Ca. In olivine, substitution mechanisms are determined by comparing the observed compositional dependence of partitioning to the compositional dependence theoretically expected for each substitution reaction. A realistic equilibrium constant is formulated for trace element exchanges between olivines, low-Ca pyroxenes, and melt, making possible improved modeling of the variations of trace element partitioning with temperature and phase composition.

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