Partitioning of Ni 2+ , Co 2+ , Fe 2+ , Mn 2+ and Mg 2+ between olivine and silicate melts: compositional dependence of partition coefficient

Details Partitioning of Ni 2+ , Co 2+ , Fe 2+ , Mn 2+ and Mg 2+ between olivine and silicate melts: compositional dependence of partition coefficient Partitioning of Ni 2+ , Co 2+ , Fe 2+ , Mn 2+ and Mg 2+ between olivine and silicate melts: compositional dependence of partition coefficient

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1829t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Issue 12, pp.1829-1844

Computer Science

35

Scientific paper

Partitioning of Ni 2+ , Co 2+ , Fe 2+ , Mn 2+ and Mg 2+ between olivine and silicate melts has been determined near the join (Mg 0.5 ·-Fe 0.5 ) 2 SiO 4 -K 2 O 4SiO 2 and for seven different basaltic compositions. The experiments were made at 1 atm total pressure, 1500-1100°C, and under moderate to reducing oxygen fugacities. The concentration factor, defined as K MO = (MO) ol /(MO) liq (molar ratio), increases markedly for all the cations studied as the olivine component of the liquid decreases. Much of the increase in K MO is considered as due to the compositional effect of the coexisting liquid: the temperature effect on K MO is probably opposite to the compositional effect ( K MO decreases as temperature decreases). The partition coefficient K MO - MgO = (MO/MgO) ol /(MO/MgO) liq for the reaction, M ol 2+ + Mg liq 2+ = M liq 2+ + Mg ol 2+ . is relatively constant over a wide range of SiO 2 content of the liquid, except in the case of Ni 2+ . The partition coefficients have similar ranges both in synthetic and natural rock systems: K NiO - MgO = 1.8-3.0, K CoO - MgO = 0.6-0.8, K FeO - MgO = 0.27-0.38, and K MnO - MgO = 0.23-0.32. There is a systematic variation in the partition coefficient K MO - MgO with the composition of liquid; K MO - MgO increases with increasing SiO 2 content of melt. The partition coefficients for Co 2+ , Fe 2+ and Mn 2+ are useful to test the equilibration of olivine with magma of a wide compositional range.

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