The evolution characteristics of fluid conduits, a zinc-rich-spire struture from juan de fuca ridge

DONG Congfang; ZHOU Huaiyang; PENG Xiaotong; YUAN Yuan; YAO Huiqiang

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DONG Congfang, ZHOU Huaiyang, PENG Xiaotong, YUAN Yuan, YAO Huiqiang. The evolution characteristics of fluid conduits, a zinc-rich-spire struture from juan de fuca ridge[J]. Haiyang Xuebao, 2012, 34(4): 99-108.

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The evolution characteristics of fluid conduits, a zinc-rich-spire struture from juan de fuca ridge

1.
State Key Laboratory of Marine Geology, Marine School, Tongji University, Shanghai 200092, China;Guangxi China-Tin Group Company, Limited, Liuzhou 545006, China
2.
State Key Laboratory of Marine Geology, Marine School, Tongji University, Shanghai 200092, China
3.
Guangxi No.215 Geologic Team Co., Ltd., Liuzhou 545006, China
4.
Guangzhou Marine Geology Survey, Guangzhou 510760, China

Received Date: 2010-11-22
Rev Recd Date: 2011-11-02

Abstract

Abstract

Mineralogical and geochemical studies have been carried out on an intact spire structure from Faulty Towers sulfide clusters. A sample displays four mineralogical zones from the exterior to the interior, i.e., a Fe-oxyhydroxide-barite-silica zone, a marcasite-pyrite-barite-silica zone, a marcasite-pyrite-sphalerite-wurzite zone, and a wurzite-chalcopyrite-marcasite zone, respectively. From the bottom to the top, there are three types of fluid conduits : irregular and discontinue multi-channels; oval-shape channel; and clogged channel. Mineralogy and mineral chemistry indicate low-teperature marcasite and wurtzite are the prominent mineral assemblage ,with minor chalcopyrite, only precipitated near the fluid conduits. Pb-210 data reflect that the walls formed in relatively short time (3 a), while the clogging of the fluid couduits goes through much longer time (17 a). Combined with microscopic study, the growth history of spire structure is recovered eventually.
- iron content of ZnS grains,
- precipitation condition,
- fluid conduit,
- ²¹⁰Pb age,
- growth history

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References(26)

References

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