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| 河南桐柏围山城层控金银成矿带同位素地球化学 | |
| 引用本文： | 张静,陈衍景,陈华勇,张冠,杨艳.河南桐柏围山城层控金银成矿带同位素地球化学[J].地学前缘,2008,15(4):108-124. |
| 作者姓名： | 张静 陈衍景 陈华勇 张冠 杨艳 |
| 作者单位： | 1. 中国地质大学,地质过程与矿产资源国家重点实验室,北京,100083 2. 中国科学院广州地球化学研究所,成矿动力学重点实验室,广东,广州,510640;北京大学,造山带与地壳演化重点实验室,北京,100871 3. 北京大学,造山带与地壳演化重点实验室,北京,100871 4. 河南省地质矿产局,第三地质调查队,河南,信阳,464000 |
| 基金项目： | 国家重点基础研究发展计划(973计划) , 国家自然科学基金 |
| 摘 要： | 河南省桐柏山区的围山城金银成矿带包括破山特大型银矿、银洞坡大型金矿、银洞岭大型银多金属矿床及一些矿点,赋矿地层是新元古界歪头山组,矿体产状与地层产状一致,形态呈似层状、鞍状或透镜状,层控特征显著。氢-氧-碳同位素地球化学研究指示早、中阶段的成矿流体主要为变质水,晚阶段有大量大气降水加入成矿流体系统。碳-硫-铅同位素指示成矿物质来自于歪头山组地层;钾-氩同位素表明成矿作用(100~140Ma)发生在秦岭陆陆碰撞造山的高峰期之后碰撞挤压向伸展转变的背景下。综合考虑矿带的成矿流体来源、成矿物质来源以及矿床地质特征,认为围山城成矿带属典型的层控造山型金银成矿系统,形成于中生代扬子与华北板块的陆陆碰撞造山体制。 |
| 关 键 词： | 同位素地球化学 围山城金银成矿带 层控造山型矿床 桐柏山 |
Isotope geochemistry of the Weishancheng stratabound gold-silver ore belt,Tongbai County, Henan Province, China |
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| Zhang Jing,Chen Yanjing,Chen Huayong,Zhang Guan,Yang Yan.Isotope geochemistry of the Weishancheng stratabound gold-silver ore belt,Tongbai County, Henan Province, China[J].Earth Science Frontiers,2008,15(4):108-124. | |
| Authors: | Zhang Jing Chen Yanjing Chen Huayong Zhang Guan Yang Yan |
| Abstract: | The Weishancheng ore belt is located in Tongbai Mountains and consists of three stratabound deposits (Yindongpo large gold deposit, Poshan super-large silver deposit, and Yindongling large silver-dominated poly-metallic deposit) and some small ore spots.The orebodies are strictly hosted in carbonaceous strata of the Neoproterozoic Waitoushan Formation.The H-O-C isotopic system of the fluid inclusions from each deposit indicates that the fluids in the early and middle ore-forming stages came from the metamorphic devolatilization, and in the late stage, considerable meteoric water entered the fluid system.The C-S-Pb isotope geochemistry suggests that the metallogenic materials are derived from the rocks from the Waitoushan Formation.The K-Ar and 40Ar-39Ar dating results show that the metallogenesis of the Weishancheng ore belt occurred during 100-140 Ma, when a tectonic setting changed from collisional compression to extension.The Weishancheng gold-silver ore belt belongs to a typical stratabound orogenic-type metallogenic system in terms of the ore-forming fluid, metal source, and geologic characteristics.The ore-forming process took place under the continental collision setting between Yangtze and North China plates. |
| Keywords: | isotopic geochemistry Weishancheng gold-silver ore belt stratabound orogenic-type deposit Tongbai Mountains |
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