| Mineral Components, Texture, and Forming Conditions of Hydrothermal Chimney on the East Pacific Rise at 9°-10°N |
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| 引用本文： | 郑建斌,曹志敏,安伟.Mineral Components, Texture, and Forming Conditions of Hydrothermal Chimney on the East Pacific Rise at 9°-10°N[J].中国地质大学学报(英文版),2007,18(2):128-134. |
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| 作者姓名： | 郑建斌 曹志敏 安伟 |
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| 作者单位： | College of Marine Geosciences Ocean University of China，College of Marine Geosciences Ocean University of China，China Offshore Environmental Service Ltd.，Qingdao 266100 China，Qingdao 266100 China，Tianjin 300452 China |
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| 基金项目： | This paper is supported by the National Natural Science Foundation of China (No. 40273025)，Key Laboratory of Marine Sedimentology and Environmental Geology, State Oceanic Administration, and National High Technology Research and Development Program of China (No. 2006AA09Z219). |
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| 摘 要： | To characterize the hydrothermal processes of East Pacific rise at 9o-10oN, 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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| 收稿时间： | 28 January 2007 |
Mineral Components, Texture, and Forming Conditions of Hydrothermal Chimney on the East Pacific Rise at 9°-10°N |
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| Zheng Jianbin,Cao Zhimin,An Wei.Mineral Components, Texture, and Forming Conditions of Hydrothermal Chimney on the East Pacific Rise at 9°-10°N[J].Journal of China University of Geosciences,2007,18(2):128-134. |
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| Authors: | Zheng Jianbin Cao Zhimin An Wei |
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| Institution: | 1. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2. China Offshore Environmental Service Ltd., Tianjin 300452, China |
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| Abstract: | 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) chakopyrite + 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 °C. 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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| Keywords: | hydrothermal processes black smoker mineral assemblage exsolution texture ore fluid |
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