| Geochemical anomalies of hydrothermal plume at EPR 13°N |
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| 作者单位： | WANG XiaoYuan（Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Acadamy of Sciences, Qingdao 266071, China;Graduate School of the Chinese Acadamy of Sciences, Beijing 100049, China） ;
ZENG ZhiGang（Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Acadamy of Sciences, Qingdao 266071, China） ;
LIU ChangHua（Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Acadamy of Sciences, Qingdao 266071, China;Graduate School of the Chinese Acadamy of Sciences, Beijing 100049, China） ;
YIN XueBo（Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Acadamy of Sciences, Qingdao 266071, China） ;
YU ShaoXiong（Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Acadamy of Sciences, Qingdao 266071, China;Graduate School of the Chinese Acadamy of Sciences, Beijing 100049, China） ;
YUAN ChunWei（Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Acadamy of Sciences, Qingdao 266071, China;Graduate School of the Chinese Acadamy of Sciences, Beijing 100049, China） ;
ZHANG GuoLiang（Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Acadamy of Sciences, Qingdao 266071, China;Graduate School of the Chinese Acadamy of Sciences, Beijing 100049, China） ;
WANG XiaoMei（Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Acadamy of Sciences, Qingdao 266071, China;Graduate School of the Chinese Acadamy of Sciences, Beijing 100049, China） ; |
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| 基金项目： | Supported in part by the Pilot Project of Knowledge Innovation Project of Chinese Academy of Sciences (Grant No. KZCX3-SW-223)，the National Natural Science Foundation of China (Grant No. 40376020) |
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| 摘 要： | During the DY105-12, 14cruise (R/V DAYANG YIHAO, November 2003) on East Pacific Rise (EPR) 12- 13°N, the submarine hydrothermal activity was investigated and the CTD hydrocast was carried out at EPR12°39′N-12°54′N. From the temperature anomalies and the concentrations of magnesium, chlorine, bromine in seawater samples, we discover that magnesium depletes 9.3%-22.4%, chlorine and bro- mine enrich 10.3%-28.7% and 10.7%-29.0% respectively relative to normal seawater at the stations which have chemistry anomalies, moreover temperature and chemistry anomalies are at the same layer. The depletion of magnesium in the plume may be caused by a fluid lacking of magnesium which rises after the hydrothermal fluid reaches the equilibrium with ambient seawater, the enrichment of chlorine and bromine might be the result of inputting later brine which is generated by phase separation due to hydrothermal activity. In addition, the Br/Cl ratio in the abnormal layers at the survey area is identical to that in seawater, which implies that halite dissolution (or precipitation) occurs neither when the fluid is vented nor when hydrothermal fluid entraining ambient seawater rises to form plume. From the ab- normal instance at E55 station, it is very possible that there might exist a new hydrothermal vent site.
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| 收稿时间： | 9 November 2006 |
| 修稿时间： | 28 March 2007 |
Geochemical anomalies of hydrothermal plume at EPR 13°N |
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| Authors: | Wang XiaoYuan Zeng ZhiGang Liu ChangHua Yin XueBo Yu ShaoXiong Yuan ChunWei Zhang GuoLiang Wang XiaoMei |
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| Institution: | (1) Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China;(2) Graduate School of the Chinese Acadamy of Sciences, Beijing, 100049, China |
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| Abstract: | During the DY105-12, 14cruise (R/V DAYANG YIHAO, November 2003) on East Pacific Rise (EPR) 12–13°N, the submarine hydrothermal
activity was investigated and the CTD hydrocast was carried out at EPR12°39′N–12°54′N. From the temperature anomalies and
the concentrations of magnesium, chlorine, bromine in seawater samples, we discover that magnesium depletes 9.3%–22.4%, chlorine
and bromine enrich 10.3%–28.7% and 10.7%–29.0% respectively relative to normal seawater at the stations which have chemistry
anomalies, moreover temperature and chemistry anomalies are at the same layer. The depletion of magnesium in the plume may
be caused by a fluid lacking of magnesium which rises after the hydrothermal fluid reaches the equilibrium with ambient seawater,
the enrichment of chlorine and bromine might be the result of inputting later brine which is generated by phase separation
due to hydrothermal activity. In addition, the Br/Cl ratio in the abnormal layers at the survey area is identical to that
in seawater, which implies that halite dissolution (or precipitation) occurs neither when the fluid is vented nor when hydrothermal
fluid entraining ambient seawater rises to form plume. From the abnormal instance at E55 station, it is very possible that
there might exist a new hydrothermal vent site.
Supported in part by the Pilot Project of Knowledge Innovation Project of Chinese Academy of Sciences (Grant No. KZCX3-SW-223)
and the National Natural Science Foundation of China (Grant No. 40376020) |
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| Keywords: | submarine hydrothermal activity plume hydrothermal fluid EPR |
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