| 热液成矿作用的地质地球化学动力学——以胶东牟平-乳山金矿带为例 |
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| 引用本文： | 赵伦山,高大忠,李嘉.热液成矿作用的地质地球化学动力学——以胶东牟平-乳山金矿带为例[J].地球科学,1994,3(3). |
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| 作者姓名： | 赵伦山 高大忠 李嘉 |
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| 作者单位： | 中国地质大学地球化学室 北京1O0083 |
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| 基金项目： | 国家自然科学基金项目（NO.48970175）资助 |
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| 摘 要： | 通过对胶东牟平—乳山热液脉状金,铅锌矿床成矿动力学控制规律的研究,说明了建立热液成矿反应体系的方法,并得出以下认识:（1）区域断裂构造活动,通过影响成矿反应体系的热力学性质和条件,控制元素的富集和分散。（2）热液成矿过程中容矿断裂活动可划分为两种作用方式:脆性破裂和韧—脆性张开,构成热液成矿的两种构造动力学环境。（3）热液成矿反应体系是一种开放的动态的热力学体系。断裂的脆性破裂阶段,使体系处于强烈的过饱和状态,矿质在远离平衡状态下快速结晶,加剧物质分异;在脆—韧性张开阶段,矿质在接近平衡态体系中缓慢晶出。（4）热液演化晚期,金在残余溶液中富集;当断裂再次发生构造脉动震颤时,早期形成的块状黄铁矿矿石碎裂,富金溶液充填其中,形成含裂隙金和晶隙金的富矿石。成矿体系热力学演化与构造动力学条件有利的匹配控制着富矿石的形成。
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| 关 键 词： | 热液矿床 成矿反应体系 构造动力学控制 耦合成矿机制 |
A Study on Geological-Geochemical Dynamics of Hydrothermal Ore-Formation:An Example of Muping-Rushan Gold Deposit Belt, Eastern Shandong Province |
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| Zhao Lunshan,Gao Taizhong,Li Jia.A Study on Geological-Geochemical Dynamics of Hydrothermal Ore-Formation:An Example of Muping-Rushan Gold Deposit Belt, Eastern Shandong Province[J].Earth Science-Journal of China University of Geosciences,1994,3(3). |
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| Authors: | Zhao Lunshan Gao Taizhong Li Jia |
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| Abstract: | On the basis of study on Muping - Rushan gold and lead-zinc hydrothermal deposits ofEastern Shandong Province, the paper presente a method of setting up a hydrothermal ore-forming reaction system. And following conclusions on geochemical dynamic controlling during the course of hydrothermal minerauzation are drawn: (1)The regional tectonic activities control the concentration of dispersion of elements in the ore - forming process by means of its effect on thermodynamic nature and conditions of the ore-forming reaction system. (2) During hydrothermal mineralization the activites of ore -hearing fracture can be divided into two stages: brittle splitting and brittle -tough tensing stages which create characteristically different geodynamic condition on geochemical thermodynamic system of the ore - formation. (3) The hydrothermal ore -forming reaction system is an open dynamic system. At the brittle splitting stage the system is strongly supersaturated and unequlibrated, that quicken and enhance the crystallization and the differentiatie n of ore -forming fiuid. And at the brittle-tough tensing stage, the ore -forming system is in a weak supersaturated state, gradually reducing of the temperature and pressure, the crystallization of ore -forming material is slowly, and it can be re-garded as equilbrated state. (4) In the later stage of hydrothermal evolution, as a result of crystallization of SiO2 and FeS2,the gold is enriched in the residual ore-forming solution. The fracture activity in this stage is in the pulsating state, that leads to the crush of pyrite ore and it fill up with enriched gold solution forming highgrade gold ore in the form of crys-tal - interface and fractionation gold. Therefore highgrade mineral ore in the hydrothermal pro-cesses is formed as a result of integrating of the thermodynamic evolution of hydrothermal system with the favorable tectonic dynamic condition, and it could be called "coupling" process. |
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| Keywords: | hydrothermal deposit ore-forming reaction system tectonic dynamic control coupling in ore-formation |
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