The carbon and hydrogen isotopic compositions of pumices in the Okinawa Trough

YU Zeng-hui; ZHAI Shi-kui; ZHAO Guang-tao

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YU Zeng-hui, ZHAI Shi-kui, ZHAO Guang-tao. The carbon and hydrogen isotopic compositions of pumices in the Okinawa Trough[J]. Haiyang Xuebao, 2004, 26(6): 58-64.

Citation:

YU Zeng-hui, ZHAI Shi-kui, ZHAO Guang-tao. The carbon and hydrogen isotopic compositions of pumices in the Okinawa Trough[J]. Haiyang Xuebao, 2004, 26(6): 58-64.

YU Zeng-hui, ZHAI Shi-kui, ZHAO Guang-tao. The carbon and hydrogen isotopic compositions of pumices in the Okinawa Trough[J]. Haiyang Xuebao, 2004, 26(6): 58-64.

Citation:

YU Zeng-hui, ZHAI Shi-kui, ZHAO Guang-tao. The carbon and hydrogen isotopic compositions of pumices in the Okinawa Trough[J]. Haiyang Xuebao, 2004, 26(6): 58-64.

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The carbon and hydrogen isotopic compositions of pumices in the Okinawa Trough

China Ocean University, Qingdao 266003, China

Received Date: 2002-06-20
Rev Recd Date: 2003-12-02

Abstract

Abstract

The carbon and hydrogen isotopic compositions of CO₂ and H₂O in the gas releasing from the pumice samples in the Okinawa Trough by stepped heating are determined by the mass spectrometer.The primary CO₂ and H₂O are mainly released between 400 and 1 000.The carbon isotopic compositions of CO₂ vary between-6.7×10^-3 and-22.7×10^-3,and hydrogen isotopic compositions of H₂ Ovary from-45×10^-3 to-71×10^-3,which indicate the mantle source of the primary magma of pumices.Also,the hydrogen isotopic compositions of pumices are almost as same as those of basalts.This infers the close petrogenic relationship between them and pumices might have common magma sources with the basalts in the trough,but only they experienced different evolving processes.However,the carbon isotopic compositions are systematically lighter than those of mid-ocean ridge basalts,and tend to gather those of island arc rocks.Hydrogen isotopic compositions are heaver than those of mid-ocean ridge basalts,and also run to those of island arc rocks.These features suggest the influence of the fluid derived from the subducting slab on the magma during its forming and ascending process.
- carbon and hydrogen isotopic compositions,
- subducting slab,
- pumice,
- Okinawa Trough

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References(23)

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