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- W2091342634 abstract "Clinopyroxenes play an important role in determining the distribution of trace elements in magmatic systems. In order to evaluate the extent and source of variation of clinopyroxene-silicate melt partition coefficients (D), experiments were conducted on natural basalts (picrite, alkaline basalt, nephelinite, high-alumina basalt; 1235–1300°C; 1–2.8 GPa) doped with a multi-element spike (Ti, Cr, V, Sr, Y, Zi, Nb, Ta, Hf, La, Ce, Nd, Sm, Dy and Yb) and water (2%). Trace-metal concentrations were determined by synchrotron XRF (SXRF) microprobe and a subset of samples were analyzed by SXRF superconducting wiggler and ion microprobe (IMP). Mid-range D-values (by IMP) for clinopyroxene in a picritic starting composition at 1300°C and 1 GPa are: Dti, 0.273; DV, 2.77; DCr, 7.32; DSr, 0.079; DY, 0.376; DZr, 0.089; DNb, 0.003; DHf, 0.179; DTa, 0.010; DLa, 0.03; DCe, 0.054; DNd, 0.112; DSm, 0.201; DDy, 0.280; and DYb, 0.255. D-values for Ta and Zr are lower than adjacent D-values for REE (La and Nd, respectively) on a spider diagram; however, there is no decoupling observed between DTi, DHf and adjacent DREE (DY,Yb). Many of the experiments resulted in sector-zoned augite, and these constrain the nature of crystal chemical controls on partitioning at fixed T,P,X. Sector-zoned augite in an alkaline basalt at 1250°C and 1 GPa shows enrichment in Ti, Al, Ca, Cr, trace HFSE and REE and depletion in Si, Mg and Fe in the fast-growing (100) sector relative to the slower growing (010) sector. Reverse-zoning in incompatible elements in the (100) sector adjacent to normally-zoned (010) sectors confirms that sector zoning in augite arises from differences in surface kinetic processes (adsorption-desorption) during crystal growth. A positive correlation between IVAl and HFSE concentrations emphasizes the importance of coupled substitution involving highly charged cations in M sites and Al in T sites." @default.
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- W2091342634 date "1994-11-01" @default.
- W2091342634 modified "2023-10-18" @default.
- W2091342634 title "High-pressure experimental trace-element partitioning between clinopyroxene and basaltic melts" @default.
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- W2091342634 doi "https://doi.org/10.1016/0009-2541(94)90125-2" @default.
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