Geochemical anomalies of hydrothermal plume at EPR 13°N
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- 作者：XiaoYuan Wang (1) (2)
ZhiGang Zeng (1)
ChangHua Liu (1) (2)
XueBo Yin (1)
ShaoXiong Yu (1) (2)
ChunWei Yuan (1) (2)
GuoLiang Zhang (1) (1)
XiaoMei Wang (1) (2) - 关键词：submarine hydrothermal activity ; plume ; hydrothermal fluid ; EPR
- 刊名：Science China Earth Sciences
- 出版年：2007
- 出版时间：September 2007
- 年：2007
- 卷：50
- 期：9
- 页码：1433-1440
- 全文大小：2274KB
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ZhiGang Zeng (1)
ChangHua Liu (1) (2)
XueBo Yin (1)
ShaoXiong Yu (1) (2)
ChunWei Yuan (1) (2)
GuoLiang Zhang (1) (1)
XiaoMei Wang (1) (2)
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 - ISSN：1869-1897
文摘
During the DY105-12, 14cruise (R/V DAYANG YIHAO, November 2003) on East Pacific Rise (EPR) 12-3°N, the submarine hydrothermal activity was investigated and the CTD hydrocast was carried out at EPR12°39′N-2°54′N. From the temperature anomalies and the concentrations of magnesium, chlorine, bromine in seawater samples, we discover that magnesium depletes 9.3%-2.4%, chlorine and bromine enrich 10.3%-8.7% and 10.7%-9.0% 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.