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- W3142449198 endingPage "120193" @default.
- W3142449198 startingPage "120193" @default.
- W3142449198 abstract "The processes that caused the heterogeneity of δ37Cl in the Earth's mantle are unclear. Here we report theoretical estimates of equilibrium chlorine isotope fractionation among common chlorine-bearing minerals, namely apatite-group minerals (Cl-Ap, F-Cl-Ap, OH-Cl-Ap), muscovite, phlogopite, tremolite, lizardite, marialite and metal halides, based on first-principles calculations, and use them to provide an explanation for this heterogeneity. Our results show that at ambient P-T conditions, the reduced isotopic partition function ratio (β-factor) is strongly correlated with the metal-Cl bond length/bond strength of the above minerals and that phlogopite and muscovite are more enriched in 37Cl than other minerals. As a result of a number of factors, including the adjacent atomic environment, the sites occupied by chlorine atoms in crystals, the Cl-metal coordination and the crystal density, the sensitivity of 103lnβ to pressure follows the sequence: halite > fluoro-chlorapatite > chlorapatite > marialite > hydroxyl-chlorapatite > lizardite > tremolite > muscovite > phlogopite. Estimates of the chlorine isotope fractionation between chlorine-bearing minerals and aqueous fluid at the pressure and temperature prevailing during subduction indicate that the δ37Cl values of mantle minerals could vary between −6‰ and + 3‰, assuming equilibrium. In contrast, the average δ37Cl value of the bulk mantle is −0.53 ± 0.16‰. Thus, large-scale recycling of volatile Cl from the deep mantle to the continental/oceanic crust and ocean, and the isotopic fractionation of chlorine with increasing metamorphic grade during subduction, could explain the heterogeneity of δ37Cl values observed in mantle materials." @default.
- W3142449198 created "2021-04-13" @default.
- W3142449198 creator A5014093223 @default.
- W3142449198 creator A5020347295 @default.
- W3142449198 creator A5030917482 @default.
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- W3142449198 creator A5082919794 @default.
- W3142449198 creator A5084124762 @default.
- W3142449198 creator A5086843027 @default.
- W3142449198 date "2021-06-01" @default.
- W3142449198 modified "2023-10-16" @default.
- W3142449198 title "Chlorine isotope mantle heterogeneity: Constraints from theoretical first-principles calculations" @default.
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