Oxygen and hydrogen isotopic compositions of coexistent minerals of the Tasigake alkali granite pluton, northern Xinjiang: constraints upon the cause of18OD depletion and the18O/16O exchange kinetics |
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Authors: | Wei Liu Zhenhua Zhao Fuqin Zhang |
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Institution: | (1) Research Center of Mineral Resource Exploration, Institute of Geophysics, Chinese Academy of Science, 100101 Beijing, China;(2) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China |
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Abstract: | Oxygen and hydrogen isotopic compositions have been determined of three coexistent mineral triplets of alkali feldspar, quartz,
arfvedsonite of 11 samples collected from the Tasigake alkali granite pluton, Ulungur River region, northern Xinjiang. Isotopic
exchange with meteoric water during subsolidus cooling caused strong18O-D depletion and the remarkable nonequilibrium18O/16O relation between coexistent minerals.18O/16O exchange kinetic effects of the three minerals are simultaneously and consistently modelled. Exsolution and microtextural
reorganization of alkali feldspar, and infiltration of water have been mutually facilitated by each other. Shallow intrusion,
and circulation of meteoric water throughout the pluton cool it effectively. As a result, the “heat engine” is rapidly extinguished,
and the nonequilibrium18O/16O relation is frosen. |
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Keywords: | 18OD depletion Isotopic exchange kinetics alkali granite Ulungur |
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