Other
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42..789l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Issue 6, pp.789-800
Other
10
Scientific paper
Consideration of experimental data on the distribution of Mg 2+ between olivine and silicate liquid clearly demonstrates that the distribution coefficient (K Mg ) is dependent upon variations in temperature, pressure and melt composition, largely because these variables control the solubility of Mg 2+ in the melt phase. Attempts to minimize composition dependence of K Mg , utilizing various activity-composition models for silicate melts, have been partially successful. Composition-related effects do not appear to be large, however, for melts of restricted range in composition (e.g., tholeiitic or lunar basalts) as long as the contents of alkalis and the alkali/alumina ratio are relatively small (on a molar basis). For such melts, K Mg may be used as a reliable geothermometer. By analogy, these conclusions can be extended to the distribution of other divalent cation such as Fe 2+ , Mn 2+ , Ni 2+ and Co 2+ .
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