| 胶东招掖矿集区巨量金质来源和流体成矿效应 |
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| 引用本文： | 邓军,杨立强,刘伟,孙忠实,李新俊,王庆飞.胶东招掖矿集区巨量金质来源和流体成矿效应[J].地质科学,2001,36(3):257-268. |
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| 作者姓名： | 邓军 杨立强 刘伟 孙忠实 李新俊 王庆飞 |
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| 作者单位： | 1. 中国地质大学, 北京, 100083;2. 中国科学院地质与地球物理研究所, 北京, 100101;3. 吉林大学地球科学学院, 长春, 130061 |
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| 基金项目： | 国家重点基础研究发展规划项目 (编号 :G1 9990 4 32 0 6)，国家科技攀登计划项目(编号 :95 预 39和 95 预 2 5)，教育部“高等学校骨 |
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| 摘 要： | 胶东招掖大型金矿集中区的形成是一个多期次、多来源的复杂过程.胶东群正变质岩的原岩——太古代拉斑玄武岩为初始矿源岩;太古代-元古代胶东群、荆山群和粉子山群变质岩为中间矿源岩;中生代剪切重熔岩浆岩——玲珑型花岗岩和郭家岭型花岗岩是成矿物质的主要直接提供者;郭家岭型花岗岩还起到"热机"作用;而蓬莱群及滦家河型花岗岩提供成矿物质的可能性较小.金的成矿作用是在古老地幔分异出的太古代拉斑玄武岩基础上,经韧性剪切→区域变质→岩浆重熔等构造热动力作用逐步富集的过程.岩浆侵入后,形成以岩体为中心的凸形热场,是流体成矿作用的主要动力之一.成矿流体的流速可以促进混合热液的生长,剪切破碎带是强烈输运-反应耦合成矿的有利场所.地幔富C-H-O流体、中-下部地壳富硅流体、浅-表部富硫流体3个层次流体相互沟通、混合,导致流体循环持续时间增长,萃取围岩有用元素增多,成矿元素丰度升高,并最终形成胶东招掖金矿集中区.
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| 关 键 词： | 大型矿集区 金质来源 流体循环 成矿效应 胶东招掖 |
| 收稿时间： | 1999-12-24 |
| 修稿时间： | 1999年12月24 |
GOLD ORIGIN AND FLUID ORE-FORMING EFFECT OF ZHAO-YE OREDEPOSITS CONCENTRATING AREA IN JIAODONG, SHANDONG, CHINA |
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| Deng Jun,Yang Liqiang,Liu Wei,Sun Zhongshi,Li Xinjun,Wang Qingfei\.GOLD ORIGIN AND FLUID ORE-FORMING EFFECT OF ZHAO-YE OREDEPOSITS CONCENTRATING AREA IN JIAODONG, SHANDONG, CHINA[J].Chinese Journal of Geology,2001,36(3):257-268. |
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| Authors: | Deng Jun Yang Liqiang Liu Wei Sun Zhongshi Li Xinjun Wang Qingfei\ |
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| Institution: | 1. China University of Geosciences, Beijing 100083;2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101;3. College of Earth Sciences, Jilin University, Changchun 130061 |
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| Abstract: | Based on geological analysis, taking the Zhao Ye gold ore deposits concentrating area for example and applying modern fractal theory, mathematical geology and computer simulation, a thorough study was made on ore source system, fluids flowing and ore forming effect, which played the roles of internal cause, external cause and evolution of ore bearing properties respectively. The results are summaried as follows. 1)The metallogenic system is a super complex entirety. It is made up of multi level temport spatial scale, manifold ore controlling parameters and multifarious processes. The ore forming process is one expression of dynamic functions of the Earth. It is a complex non linear dynamic process. Dynamics is key that defines the evolution and final outcome of the system. 2)Ore source system consists of initial, intermediate and direct ore source rocks, such as the Jiaodong, Jingshan and Fenzishan Groups, and the Linglong type granites provides materials for mineralization. While the Guojialing type granites may not only provide ore forming materials partly, but also play a role as "hot engine". There is little probability for the Penglai Group and the Luanjiahe type granites to provide ore forming materials. 3)Gold mineralization is a complex ploy staged and ploy sourced process. It started with Archean tholeiites fractionated from the ancient mantle and underwent shear, regional metamorphism and anatexis. Gold was enriched gradually in those tectonic thermal dynamic processes. Mesozoic shear remelting granites provided ore forming materials directly. 4) Remobilization, migration and enrichment of ore forming material generated by compressional extensional shear tectonics are main cause of mineralization. The decisive factors of gold mineralization are the geochemical characteristics of ore forming elements and the features of ore forming fluids. 5) The temperature gradient belts around the rock body after its intrusion are one of the main dynamics for hydrothermal mineralization. 6) The flow rate of ore forming fluid can accelerate the formation of mixed hydrothermal solution, and the shear crushing zone is an advantageous ore forming place with strong transportation and action. 7) Gold deposits are formed especially by long range moving mantle fluid, which is more important to gold origin and rich mechanism in moving fluid. The key of giant gold origin and enrichment is link up for three kinds of gradations of circulatory system of Au bearing fluids: the C H O bearing fluid in mantle, the Si bearing one in middle lower crust, and the S bearing one in shallow surface. Because of the three kinds of fluids linking up and mixing each other, the time of circulatory system of Au bearing fluids gets longer, the quantity of extraction of ore forming elements gets larger, the abundance of gold gets higher; and the gold ore deposit concentrating area gets formed finally. |
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| Keywords: | Large scale deposits concentrating area Gold origin Fluids flowing Ore forming effects Zhao-Ye of Jiaodong |
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