Melting and crystal-liquid partitioning in the system Mg2SiO4- Fe2SiO4 to 25 GPa

Details Melting and crystal-liquid partitioning in the system Mg2SiO4- Fe2SiO4 to 25 GPa Melting and crystal-liquid partitioning in the system Mg2SiO4- Fe2SiO4 to 25 GPa

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pepi..107...75o&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 107, Issue 1-3, p. 75-82.

Physics

5

Scientific paper

The melting relation of the Mg2SiO4-Fe2SiO4 system was studied at 8.5 GPa. Olivine and spinel melts incongruently into pyroxene and the liquid in the Fe2SiO4 rich portion of the system. Olivine melts congruently at least in the compositional range from (Mg0.5Fe0.5)2SiO4 to (Mg0.9Fe0.1)2SiO4, although the end member of Mg2SiO4 melts incongruently into periclase and the liquid at pressures above 8 GPa. The melting relation of (Mg0.9Fe0.1)2SiO4 was also studied up to 25 GPa. Olivine and modified spinel of this composition melt incongruently into anhydrous phase B and liquid, and into magnesiowustite and liquid at higher temperatures in the pressure range from 18 GPa to 23 GPa. Magnesiowüstite is the liquidus phase at higher pressures at least up to 25 GPa in this composition. The partition coefficients between crystal and liquid are; DMg=1.19(+/-0.06), DSi=0.88(+/-0.04), DV=0.63(+/-0.16), DCr=1.04(+/-0.21), DMn=0.42(+/-0.08), DFe=0.76(+/-0.07), DCo=1.24(+/-0.44), DNi=1.46(+/-0.81) for modified spinel; DMg=1.41(+/-0.06), DSi=0.72(+/-0.03), DV=0.44(+/-0.11), DCr=0.94(+/-0.12), DMn=0.30(+/-0.07), DFe=0.56(+/-0.06), DCo=1.19(+/-0.30), DNi=1.65(+/-0.87) for anhydrous phase B; DMg=2.09(+/-0.11), DV=0.64(+/-0.06), DCr=1.01(+/-0.05), DMn=0.7(+/-0.04), DFe=1.45(+/-0.08), DCo=2.73(+/-0.15), DNi=4.72(+/-0.25) for magnesiowüstite. The present results of melting relations and partitioning are applied for the fractionation in the mantles of the terrestrial planets, such as Mars and Mercury.

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