Sulfur isotopic composition of seafloor hydrothermal sediment from the Jade hydrothermal field in the central Okinawa Trough and its geological significance

Zeng Zhigang; Jiang Fuqing; Zhai Shikui; Qin Yunshan; Hou Zengqian

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Article Navigation > Haiyang Xuebao > 2000 > 22(4): 74-82

Zeng Zhigang, Jiang Fuqing, Zhai Shikui, Qin Yunshan, Hou Zengqian. Sulfur isotopic composition of seafloor hydrothermal sediment from the Jade hydrothermal field in the central Okinawa Trough and its geological significance[J]. Haiyang Xuebao, 2000, 22(4): 74-82.

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Sulfur isotopic composition of seafloor hydrothermal sediment from the Jade hydrothermal field in the central Okinawa Trough and its geological significance

1.
Institute of Oceanology, Chinese Academy of Scisnces, Qingdao 266071
2.
Chinese Academy of Geological Sciences, Beijing 100037

Received Date: 1999-01-05
Rev Recd Date: 1999-08-30

Abstract

Abstract

Eighteen samples of h州rothermal sediments from the Jade hydrothermal field in the central Okinawa Trough have been analyzed.Sulfur isotopic values for 10 sulfide samples vary from 5.2×10^-3 to 7.2×10^-3, δ³⁴S values for 7 sulfate samples vary from 16.3×10^-3 to 22.3×10^-3, and δ³⁴S value for 1 native sulphur sample is 8.2×10^-3.The major sources of sulfur for hydrothermal sediment are intermediate to acid volcanic rocks and seawater sulfate, and it is possible that the partial sulfur of hydrothermal sediment is from the pelagic sediment by the interaction between hydrothermal fluid and sediment.The、of causing the distinct differences in sulfur isotope values for sulfide samples from hydrothermal sediment(compared with other hydrothermal fields), are the differences in the sources of sulfur, the magmatic activity and the tectonic evolution in different hydrothermal fieds.The sulfur evolution is a long and complex process in the seafloor hydrothermal system, involving the ascending of heating seawater, the interaction between fluid and volcanic rocks, the mixing of seawater sulfate and sulfur from intermediate to acid volcanic rocks, and the fluid/pelagic-sediment interaction.And the interaction between seawater and intermediate to acid volcanic rocks is a important mechanism for the sulfur evolution in the Jade hydrothetmal field.
- Sulfur isotopic composition,
- seafloor hydrothermal sediment,
- Jade hydrothermal field

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