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- W2020313943 abstract "Abstract The volatization of Rhenium (Re) from melts of natural basalt, dacite and a synthetic composition in the CaO–MgO–Al2O3–SiO2 system has been investigated at 0.1 MPa and 1250–1350 °C over a range of fO2 conditions from log fO2 = −10 to −0.68. Experiments were conducted using open top Pt crucibles doped with Re and Yb. Analysis of quenched glasses by laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS) normal to the melt/gas interface showed concentration profiles for Re, to which a semi-infinite one-dimensional diffusion model could be applied to extract diffusion coefficients (D). The results show Re diffusivity in basalt at 1300 °C in air is log DRe = −7.2 ± 0.3 cm2/s and increases to log DRe = −6.6 ± 0.3 cm2/s when trace amounts of Cl were added to the starting material. At fO2 conditions below the nickel–nickel oxide (NNO) buffer Re diffusivity decreases to log D Re reducing = − 7.6 ± 0.2 cm 2 / s and to log D Re dacite = − 8.4 ± 0.2 cm 2 / s in dacitic melt. In the CMAS composition, log D Re CMAS = − 7.5 ± 0.1 . The diffusivity of Re is comparable to Ar and CO2 in basalt at 500 MPa favoring its release as a volatile. Our results support the contention that subaerial degassing is the cause of lower Re concentrations in arc-type and ocean island basalts compared to mid-ocean ridge basalts." @default.
- W2020313943 created "2016-06-24" @default.
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- W2020313943 date "2006-10-01" @default.
- W2020313943 modified "2023-10-17" @default.
- W2020313943 title "Experimental constraints on the mobility of Rhenium in silicate liquids" @default.
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- W2020313943 doi "https://doi.org/10.1016/j.gca.2006.07.032" @default.
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