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• W2023810118 endingPage "22" @default.
• W2023810118 startingPage "1" @default.
• W2023810118 abstract "Previously published Cu partition coefficients (DCu) between silicate minerals and melts cover a wide range and have resulted in large uncertainties in model calculations of Cu behavior during mantle melting. In order to obtain true DCumineral/melt values, this study used Pt95Cu05 alloy capsules as the source of Cu to experimentally determine the DCu between olivine (ol), orthopyroxene (opx), clinopyroxene (cpx), spinel (spl), garnet (grt) and hydrous silicate melts at upper mantle conditions. Three synthetic silicate compositions, a Komatiite, a MORB and a Di70An30, were used to produce these minerals and melts. The experiments were conducted in piston cylinder presses at 1.0–3.5 GPa, 1150–1300 °C and oxygen fugacities (fO2) of from ∼2 log units below to ∼5 log units above fayalite–magnetite–quartz (FMQ). The compositions of minerals and quenched melts in the run products were measured with EMP and LA-ICP-MS. Attainment of equilibrium is verified by reproducible DCu values obtained at similar experimental conditions but different durations. The results show that DCu for ol/, opx/, spl/ and possibly cpx/melt increase with increasing fO2 when fO2 > FMQ + 1.2, while DCu for cpx/ and spl/melt also increase with increasing Na2O in cpx and Fe2O3 in spinel, respectively. In the investigated P–T–fO2 conditions, the DCumineral/melt values are 0.04–0.14 for ol, 0.04–0.09 for opx, 0.02–0.23 for cpx, 0.19–0.77 for spl and 0.03–0.05 for grt. These results confirm that Cu is highly incompatible (DCu < ∼0.2) in all the silicate minerals and oxides of the upper mantle with the exception of the high-Fe spinel, in which Cu is moderately incompatible (DCu = 0.4–0.8) and thus Cu will be enriched in the derived melts during mantle partial melting and magmatic differentiation if sulfide is absent. These experimental DCu values are used to assess the controls on Cu behavior during mantle melting. The model results suggest that MORBs and most arc basalts must form by sulfide-present melting at relatively reduced conditions, while high Cu (>70 ppm) arc basalts may form at oxidized, sulfide-absent conditions, which is consistent with the possibility of some high fO2 regions present in the arc mantle." @default.
• W2023810118 created "2016-06-24" @default.
• W2023810118 creator A5008947832 @default.
• W2023810118 creator A5027475930 @default.
• W2023810118 creator A5040843536 @default.
• W2023810118 creator A5060844794 @default.
• W2023810118 creator A5065230178 @default.
• W2023810118 creator A5066572736 @default.
• W2023810118 creator A5074329137 @default.
• W2023810118 creator A5082916240 @default.
• W2023810118 date "2014-01-01" @default.
• W2023810118 modified "2023-10-17" @default.
• W2023810118 title "Partitioning of copper between olivine, orthopyroxene, clinopyroxene, spinel, garnet and silicate melts at upper mantle conditions" @default.
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