Ore-forming matter sources of hydrothermal black smoker chimneys in the Endeavour segment of the Juan de Fuca Ridge: sulfur isotope constraints

YAO Hui-qiang; ZHOU Huai-yang; PENG Xiao-tong; HE Gao-wen

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YAO Hui-qiang, ZHOU Huai-yang, PENG Xiao-tong, HE Gao-wen. Ore-forming matter sources of hydrothermal black smoker chimneys in the Endeavour segment of the Juan de Fuca Ridge: sulfur isotope constraints[J]. Haiyang Xuebao, 2010, 32(5): 25-33.

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Ore-forming matter sources of hydrothermal black smoker chimneys in the Endeavour segment of the Juan de Fuca Ridge: sulfur isotope constraints

1.
Guangzhou Marine Geology Survey Bureau, Ministry of Land and Natural Resources, Guangzhou 510760, China; State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, G
2.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
3.
Guangzhou Marine Geology Survey Bureau, Ministry of Land and Natural Resources, Guangzhou 510760, China

Received Date: 2009-09-03

Abstract

Abstract

Seventeen samples were collected from hydrothermal black smoker chimneys in the Endeavour segment of the Juan de Fuca Ridge, and were analyzed for sulfur isotope compositions.The ore-forming matter sources of hydrothermal black smoker chimneys were discussed, and the sulfur isotope data were coupled with the published data of hydrothermal fluid and sulfide.Summaries and /or conclusions are as follows.(1) Sulfide from the Endeavour segment has similar sulfur isotope range as that of other sediment-starving mid-ocean ridges, and heavy isotope is depleted when comparing with that of SJDFR (southern Juan de Fuca Ridge). Together with the previous results, it is considered that if sulfur in sulfide of SJDFR wholly comes from the leaching of basal basalts and sulfate in seawater,1%～3% sediment should contribute to sulfide in the Endeavour segment. Therefore, the sulfur sources for sulfide in the Endeavour segment are mainly from the leaching of basal basalts and minor from seawater and sediment. (2) Coupling the sulfur isotope data with the published data of hydrothermal fluid and sulfide, it is suggested that the sources for the sediment signal in hydrothermal fluid and sulfur in sulfide may be different, and it is proposed that the sediment end-member should be located in the recharge zone.
- mid-ocean ridge,
- Endeavour segment,
- hydrothermal black smoker chimney,
- sulfide, sulfur isotope composition,

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