Physics
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2337k&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 13, p. 2337-2340
Physics
19
Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineralogy And Petrology: Igneous Petrology, Mineralogy And Petrology: Major Element Composition, Mineralogy And Petrology: Crystal Chemistry
Scientific paper
The partitioning of Mg and Fe between olivine and mafic-ultramafic melts has been examined based on previous and new experimental data. We find that the exchange partition coefficient, KD, changes primarily as a function of melt composition, expressed either as MgO+FeO content or degree of polymerization, NBO/T, rather than temperature or pressure. KD increases from about 0.23+/-0.02 at an NBO/T of ~0 to a maximum of 0.35+/-0.02 at an NBO/T of ~2, and then decreases to 0.23+/-0.02 for the pure olivine system (NBO/T=4). We suggest that the following empirical relation yields a reliable estimate of KD for mantle derived melts: KD=0.235+0.120.(NBO/T)-0.031.(NBO/T)2. The change of KD shown here should be taken into account when calculating the composition of olivine coexisting with basaltic to ultramafic melts.
Kushiro Ikuo
Walter Michael J.
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