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Two stages of isotopic exchanges experienced by the Ertaibei granite pluton, northern Xinjiang, China

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Abstract

18O/16O and D/H of coexisting feldspar, quartz, and biotite separates of twenty samples collected from the Ertaibei granite pluton, northern Xinjiang, China are determined. It is shown that the Ertaibei pluton experienced two stages of isotopic exchanges. The second stage of18O/16O and D/H exchanges with meteoric water brought about a marked decrease in the δ18O values of feldspar and biotite from the second group of samples. The D/H of biotite exhibits a higher sensitivity to the meteoric water alteration than its18O/16O. However, the first stage of18O/16O exchange with the18O-rich aqueous fluid derived from the dehydration within the deep crust caused the Δ18OQuartz-Feldspar reversal. It is inferred that the dehydration-melting may have been an important mechanism for anatexis. It is shown that the deep fluid encircled the Ertaibei pluton like an envelope which serves as an effective screen to the surface waters.

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  1. Research Center for Mineral Resources Exploration, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100101, Beijing, China

    Wei Liu

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  1. Wei Liu
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Liu, W. Two stages of isotopic exchanges experienced by the Ertaibei granite pluton, northern Xinjiang, China. Sci. China Ser. D-Earth Sci. 43, 605–616 (2000). https://doi.org/10.1007/BF02879504

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  • DOI: https://doi.org/10.1007/BF02879504

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