海底大型多金属硫化物矿体内的流体过程

李怀明; 翟世奎; 陶春辉; 于增慧

海底大型多金属硫化物矿体内的流体过程

1.
国家海洋局第二海洋研究所海底科学重点实验室,浙江杭州 310012
2.
中国海洋大学海洋地球科学学院海底科学与探测技术教育部重点实验室,山东青岛,266100

基金项目: 国家海洋局青年基金重点项目(2010318);国家海洋局第二海洋研究所基本科研业务费专项基金项目(JGO903)。

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出版历程
- 收稿日期: 2009-08-27

A numerical study of hydrothermal circulation patterns within the large hydrothermal sulfide deposit

1.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
School of Marine Geo-science, Ocean University of China, Qingdao 266100, China

摘要

摘要: 海底多金属硫化物矿体内热场和流场分布控制着多金属硫化物矿体的形成过程和成矿机制。在大洋钻探计划(ODP)和已有模拟实验研究的基础上,构建了一个具有三层结构的非均质海底多金属硫化物矿体模型,并利用地下热水系统体系模拟软件(Hydrothermal)模拟了不同渗透率情况下多金属硫化物矿体内部热场和流场的形态特征。模拟结果表明:(1)在均质海底硫化物矿体内随着瑞利数的增加,流体对流加强,运移速度加快,矿体温度降低;(2)多金属硫化物矿体的分层和介质的不均一性是控制矿体内的温度场结构、流体运移模式的重要因素,在很大程度上影响着矿体内部海水与热液流体的混合、矿物的沉淀/溶解等;(3)在大型多金属硫化物矿体区,热液流体的集中喷溢("黑烟囱")主要分布在矿体内部热源位置的上方,介质渗透率分布特征是影响烟囱区位置的重要因素。
- 海底热液活动 /
- 大型多金属硫化物矿体 /
- 热场与流场 /
- 数值模拟
Abstract: To understand the distributions of the temperature and flow fields within the large hydrothermal sulfide deposit is important to study the formation and mineralization processes of seafloor hydrothermal deposits. Based on the results of ocean deep program (ODP), a hydrothermal deposit model with 3-layer is set up, and the distributions of the thermal and current fields under different permeability conditions are simulated using the Hydrothremal software, which is developed by U.S. Geological Survey (USGS). The results indicate that (1) in the homogenous model, the increase of Rayleigh number can cause the temperature decrease and the fluid flow faster; (2) heterogenic structures within the deposit have great influence on the distribution of the temperature fields; (3) the distributions of black smokers in mature deposit are related to many factors, such as heat source and permeability.
- seafloor hydrothermal activity /
- hydrothermal sulfide deposit /
- thermal field and current field /
- numerical simulation

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参考文献(28)

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