Evolving patterns of the fluids within the TAG hydrothermal field |
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Authors: | HuaiMing Li ShiKui Zhai ZengHui Yu ChunHui Tao FengYou Chu |
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Institution: | (1) Department of Marine Geoscience, Ocean University of China, Qingdao, 266100, China;(2) Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou, 310012, China;(3) Second Institute of Oceanography, State Oceanic Administration, Hangzhou, 310012, China |
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Abstract: | The mixing of seawater/hydrothermal fluid within the large seafloor hydrothermal sulfide deposits plays a key role in the
formation processes of the sulfide deposits. Some issues attract considerable attentions in the study of seafloor hydrothermal
system in recent years, such as the relationships among different types of vent fluids, the characteristics of chemical compositions
and mineral assemblages of the hydrothermal deposits and their governing factors. Combined with the measured data of hydrothermal
fluid in the TAG field, the thermodynamic model of mixing processes of the heated seawater at different temperatures and the
hydrothermal fluid is calculated to understand the precipitation mechanism of anhydrite and the genetic relationships between
the black and white smoker fluids within the TAG mound. The results indicate that the heating of seawater and the mixing of
hydrothermal fluid/seawater are largely responsible for anhydrite precipitation and the temperature of the heated seawater
is not higher than 150°C and the temperature of the end-member hydrothermal fluid is not lower than 400°C. Based on the simulated
results, the evolving patterns of fluids within the TAG deposit are discussed. The mixed fluid of the end-member hydrothermal
fluid and the seawater heated by wall rock undergoes conductive cooling during upflowing within the deposit and forms “White
Smoker” eventually. In addition, the end-member hydrothermal fluid without mixed with seawater, but undergoing conductive
cooling, vents out of the deposit and forms “Black Smoker”.
Supported by China Ocean Mineral Resources Research and Development Association Program (Grant No. DY115-02-1-01) and National
Basic Research Program of China (Grant No. G2000078503) |
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Keywords: | seafloor hydrothermal system mixing process evolving patterns of fluids TAG hydrothermal field |
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