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Volume 18 Issue 2
Apr 2007
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Article Contents
Jianbin Zheng, Zhimin Cao, Wei An. Mineral Components, Texture, and Forming Conditions of Hydrothermal Chimney on the East Pacific Rise at 9°–10°N. Journal of Earth Science, 2007, 18(2): 128-134.
Citation: Jianbin Zheng, Zhimin Cao, Wei An. Mineral Components, Texture, and Forming Conditions of Hydrothermal Chimney on the East Pacific Rise at 9°–10°N. Journal of Earth Science, 2007, 18(2): 128-134.

Mineral Components, Texture, and Forming Conditions of Hydrothermal Chimney on the East Pacific Rise at 9°–10°N

Funds:

the National Natural Science Foundation of China 40273025

Key Laboratory of Marine Sedimentology and Environmental Geology, State Oceanic Administration, and National High Technology Research and Development Program of China 2006AA09Z219

More Information
  • Corresponding author: Zheng Jianbin, jbzheng@ouc.edu.cn
  • Received Date: 28 Jan 2007
  • Accepted Date: 22 Mar 2007
  • To characterize the hydrothermal processes of East Pacific rise at 9°–10°N, sulfide mineral compositions, textural, and geochemical features of chimney ores were studied using ore microscope, scanning electron microscope, X-ray diffraction analysis, and electron microprobe techniques. Results show that there are three mineral assemblages for the hydrothermal chimney ores, namely: (ⅰ) anhydrite + marcasite + pyrite, (ⅱ) pyrite + sphalerite + chalcopyrite, and (ⅲ) chalcopyrite + bornite + digenite + covellite. Mineral assemblages, zonational features, and geochemical characteristics of the ore minerals indicate that ore fluid temperature changed from low to high then to low with a maximum temperature up to 400 ℃. The chimney is a typical black smoker. The initial structure of the chimney was formed by the precipitation of anhydrites, and later the sulfides began to precipitate in the inner wall.

     

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