Sulfur isotopic composition of modern seafloor hydrothermal sediment and its geological significance

ZENG Zhi-gang; JIANG Fu-qing; QIN Yun-shan; ZHAI Shi-kui

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ZENG Zhi-gang, JIANG Fu-qing, QIN Yun-shan, ZHAI Shi-kui. Sulfur isotopic composition of modern seafloor hydrothermal sediment and its geological significance[J]. Haiyang Xuebao, 2001, 23(3): 48-56.

Citation:

ZENG Zhi-gang, JIANG Fu-qing, QIN Yun-shan, ZHAI Shi-kui. Sulfur isotopic composition of modern seafloor hydrothermal sediment and its geological significance[J]. Haiyang Xuebao, 2001, 23(3): 48-56.

ZENG Zhi-gang, JIANG Fu-qing, QIN Yun-shan, ZHAI Shi-kui. Sulfur isotopic composition of modern seafloor hydrothermal sediment and its geological significance[J]. Haiyang Xuebao, 2001, 23(3): 48-56.

Citation:

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Sulfur isotopic composition of modern seafloor hydrothermal sediment and its geological significance

1.
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
College of Marine Geosciences, Ocean University of Qingdao, Qingdao 266003, China

Received Date: 1999-09-15
Rev Recd Date: 2000-08-28

Abstract

Abstract

A total of 1 264 sulfur isotopic values for modern seafloo rhydrothermal sediments from different hydrothermal fields have been collected.Sulfur isotopic data for surface hydrothermal sediments from the Jade hydrothermal field in the Okinawa Trough with the TAG hydrothermal field in the Mid-Atlantic Ridge,spectively. Comparing the sulfur isotopic compositions and discussing their sources of sulfur in seafloor hydrothermal sediments from different geologic-tectonic setting are comared and their soures of sulfurard discussed.The results show that: (1)Sulfur isotopic values of sulfides and sulfates in modern seafloor hydrothermal sediments are mostly concentrated in a narrow range,δ³⁴ S values of sulfides vary from 1‰ to ~9‰,with a mean of 4.5‰(n=1042),δ³⁴ S values of sulfates vary from 19‰ to ~24‰,with a mean of 21.3‰(n=217);(2)Comparing the sulfur isotopic compositions of hydrothermal sediments from the sedimen-thosted hydrothermal fields,the range of sulfiur isotopic values for hydrothermal sediments from the sediment-free hydrothermal fields is narrow relatively;(3)The differences of sulfur isotopic compositions in sulfides from different hydrothermal fields show the differences in the sources of sulfur.The sulfur of hydrothermal sulfides in the sediment-free mid-ocean ridges is mainely from mid-coean ridge basalt,and partial from reduced sea water sulfate,it is the result of totally to partially reduced sea water sulfate mixing with basaltic sulfur.And in the sedimen-thosted mid-ocean ridges and the back-arc basins,besides the volcanics,the sediments and the organic matters also can offer their sulfur for forming hydrothermal sulfides;(4)The variations of sulfur isotopic compositions and the different sources of sulfur for hydrothermal sediments may probably be attributed to the variations of physical-chemical properties of hydrothermal fluids,the magmatic evolution and the different geologic-tectonic settings of seafloor hydrothermal systems.
- modern seafloor hydrot hermal sediment,
- sulfur isotopic composition,
- geologic significance

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References(42)

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