Numerical simulation for mixing process of fluid within seafloor sulfide deposit:taking example for the TAG field

LI Huai-ming; ZHAI Shi-kui; YU Zeng-hui; TAO Chun-hui; CHU Feng-you

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LI Huai-ming, ZHAI Shi-kui, YU Zeng-hui, TAO Chun-hui, CHU Feng-you. Numerical simulation for mixing process of fluid within seafloor sulfide deposit:taking example for the TAG field[J]. Haiyang Xuebao, 2008, 30(5): 52-61.

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Numerical simulation for mixing process of fluid within seafloor sulfide deposit:taking example for the TAG field

1.
College of Marine Geoscience, Ocean University of China, Qingdao 266100, China;Key Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute Oceanography, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
College of Marine Geoscience, Ocean University of China, Qingdao 266100, China
3.
Key Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute Oceanography, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2008-06-02
Rev Recd Date: 2008-08-04

Abstract

Abstract

Formation mechanismof the sizable hydrothermal sulfide deposit is a complex geological process involving many types of controlling factors. Mixing between hy drothermal fluid and seawater plays a key role in this process. The previous results of Ocean Drilling Program(ODP)indicate that mixing of the evolveds eawater with the hydrothermal fluid is wildly developed within the TAG hydrothermal deposit, which governs the internal structure and chemical compositions of the deposit to great extent. Taking example for the TAG field,the mixing process of the hydrothermal fluid is calculated with the seawater that is heated to different extent,in order to discuss the impact of hydrothermal fluid/seawater mixing on the formation process of the sulfide deposit. The results indicate that:(1)mixing between the heated seawater and the hydrothermal fluid derived from the deep deposit should be largely responsible for the wild precipitation of anhydrite within the TAG hydrothermal deposit;(2)330~310 is a special temperature zone in the mixing process between the seawater and the hydrothermal fluid;(3)the mixing and hydrothermal processes in differentareas(TAG-1,TAG-2 and TAG-5,etc)of the TAG hydrothermal deposithave been discussed based on the calculated results.
- hydrothermal sulfide deposit,
- mixing process,
- TAG hydrothermal field,
- numerical simulation

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References(30)

References

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