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High resolution sampling, for Sr isotope and REE analyses, was carried out along a transaction of L vent chimney collected from East Pacific Rise 9oN–10oN. Sr isotopes show these anhydrites are precipitated from a mixture between hydrothermal fluid and seawater. The calculated relative proportion of seawater and hydrothermal fluid shows that the mixing is heterogeneous on the transection of the L vent chimney. Anhydrites from the chimney show uniform chondrite-normalized REE pattern with enrichment of LREE and positive Eu anomaly. While normalized to the REE of end-member hydrothermal fluid, anhydrites also show uniform REE pattern but with negative Eu anomaly and enrichment of HREE. Combining previous studies on REEs of hydrothermal fluids from different hydrothermal systems and the hydrothermal fluid data from this region, we suggested that REE-anion complexing, rather than crystallography controlling, is the main factor that controls the REE partition behavior in the anhydrite during its precipitation from the mixture of hydrothermal fluid and seawater.
High resolution sampling, for Sr isotope and REE analyzes, was carried out along a transaction of L vent chimney collected from East Pacific Rise 9oN-10oN. Sr isotopes show these anhydrites are precipitated from a mixture between hydrothermal fluid and seawater. of seawater and hydrothermal fluid that that the mixing is heterogeneous on the transection of the L vent chimney. Anhydrites from the chimney show uniform chondrite-normalized REE pattern with enrichment of LREE and positive Eu anomaly. While normalized to the REE of end-member hydrothermal fluid, anhydrites also show uniform uniform pattern but with negative Eu anomaly and enrichment of HREE. we suggest that REE-anion complexing, rather than crystallography controlling, is the main factor that controls the REE partition behavior in the anhydrite dur ing its precipitation from the mixture of hydrothermal fluid and seawater.