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Volume 40 Issue 4
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Article Navigation >  Haiyang Xuebao  > 2018  >  40(4): 61-75
Cao Hong, Sun Zhilei, Liu Changling, Jiang Xuejun, He Yongjun, Huang Wei, Shang Luning, Wang Libo, Zhang Xilin, Geng Wei, Shi Meijuan, Li Dongyi. The metallogenic mechanism and enlightenment of hydrothermal sulfide from the ultramafic-hosted hydrothermal systems at ultra-slow spreading ridge[J]. Haiyang Xuebao, 2018, 40(4): 61-75. doi: 10.3969/j.issn.0253-4193.2018.04.006
Citation: Cao Hong, Sun Zhilei, Liu Changling, Jiang Xuejun, He Yongjun, Huang Wei, Shang Luning, Wang Libo, Zhang Xilin, Geng Wei, Shi Meijuan, Li Dongyi. The metallogenic mechanism and enlightenment of hydrothermal sulfide from the ultramafic-hosted hydrothermal systems at ultra-slow spreading ridge[J]. Haiyang Xuebao, 2018, 40(4): 61-75. doi: 10.3969/j.issn.0253-4193.2018.04.006
shu

The metallogenic mechanism and enlightenment of hydrothermal sulfide from the ultramafic-hosted hydrothermal systems at ultra-slow spreading ridge

doi: 10.3969/j.issn.0253-4193.2018.04.006
  • 1.

    The Key Laboratory of Gas Hydrate/Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China

  • 2.

    First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China

  • 3.

    Third Institute of Oceanography, State Oceanic Administration, Xiamen 361000, China

  • Received Date: 2017-04-11
  • Rev Recd Date: 2017-12-04
    Abstract
  • The 63.5°E hydrothermal field was the first ultramafic-hosted hydrothermal system on the super-slow spreading ridge-South West Indian Ridge (SWIR). In this study, we report the detailed mineralogical and geochemical characteristics of hydrothermal metal sulfides recovered from this are. The results show that the mineral assemblage were highly weathered, characterized by a large number of intermediate Fe-hydroxides filling in the vugs or fractures. Marcasite is the main mineral (there are two generations marcasite), followed by the isocubanite, and a small amount of covellite, sphalerite and pyrite were not identified. Four distinctive mineralization stages have been identified:(1) low-temperature stage consisting largely of marcasite; (2) high temperature stage distinguished by isocubanite;(3)low-temperature stage consisting mainly of euhedral marcasite stage; (4) weathering stage characterized by minor Cu-sulfides (covellite), mass Fe-ox hydroxides. For the Fe-sulfide, there only observed marcasite, which could be due to the strong reducing environment resulted from the serpentinization of peridotite. Geochemical analysis indicates that the hydrothermal sulfides relative enrichment of Fe(31.57%-44.59%), a small amount of Cu(0.16%-7.24%), however, the Zn(0.01%-0.11%) content is relatively low. As for trace elements, enrichment of Co(328×10-6-2 400×10-6)and Mn(48.47×10-6-1 730×10-6) content. The high content of Fe and Co is comparable to results from seafloor massive sulfides collected from other ultramafic-hosted sites, significantly higher than that of collected from other mafic-hosted hydrothermal systems. The unique mineral and elements characteristics of hydrothermal sulfide in coincidence with the widely exposed mantle rock and the extensive development of detachment faults at this field.
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