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- W2004253167 abstract "The distribution coefficients for Zr and Nb have been determined between armalcolite, ilmenite, clinopyroxene, rutile, plagioclase and a coexisting synthetic high Ti mare basalt melt at 11C5°, 1113° and 1128°C and at fO2 = IW × 100.5. Recommended values are D (Zr) ilm/liq = 0.28, D (Zr) arm/liq = 1.2, D (Zr) cpx/liq = 0.05 – 0.22, D (Zr) plag/liq < 0.01, D (Nb) ilm/liq = 0.80, D (Nb) arm/liq = 1.4, D (Nb) cpx/liq = 0.01 – 0.03, D (Nb) rut/liq = 16 and D (Nb) plag/liq < 0.01. Henry's law is obeyed over the compositional range studied. The measured distribution coefficients for clinopyroxene are strongly dependent on melt and crystal compositions with the activity of Al2O3 in the melt being an important controlling parameter. On the basis of the measured distribution coefficients and existing analytical data, the following conclusions can be drawn: (1) Apollo 11 (low K) and Apollo 17 high Ti mare basalts have been generated by the partial melting of an ilmenite-rich cumulate. (2) Apollo 11 (high K) mare basalts have been generated by a small degree of partial melting of a more fractionated ilmenite-rich cumulate. (3) KREEP basalt magmas may have formed as residual melts produced by extensive fractional crystallization of the lunar magma ocean. (4) Anomalous (Type II) mid-ocean ridge basalts may have been generated by small degrees of partial melting of a relatively undepleted mantle with clinopyroxene remaining in the residuum." @default.
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- W2004253167 date "1978-06-01" @default.
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- W2004253167 title "Zr and Nb partition coefficients: Implications for the genesis of mare basalts, KREEP and sea floor basalts" @default.
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- W2004253167 doi "https://doi.org/10.1016/0016-7037(78)90098-4" @default.
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