High-temperature kinetic isotope fractionation of calcium in epidosites from modern and ancient seafloor hydrothermal systems
Earth and Planetary Science Letters(2020)
摘要
•Epidosites from ophiolites have lower δ44Ca than hydrothermal fluids.•The fractionation of −0.2 to −0.5 is most likely a kinetic isotope effect.•Epidote can form from oversaturated solutions at T>250°C.•Hydrothermal silicates may commonly form under non-equilibrium conditions.
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关键词
epidote,calcium isotopes,ophiolite,hydrothermal mineralization,kinetic isotope fractionation,reactive transport
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