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| 贵州簸箕田金矿单矿物稀土元素和同位素地球化学特征 | |
| 引用本文： | 张瑜,夏勇,王泽鹏,闫宝文,付芝康,陈明.贵州簸箕田金矿单矿物稀土元素和同位素地球化学特征[J].地学前缘,2010,17(2):385. |
| 作者姓名： | 张瑜 夏勇 王泽鹏 闫宝文 付芝康 陈明 |
| 作者单位： | 1. 中国科学院,地球化学研究所,矿床地球化学国家重点实验室,贵州,贵阳,550002;中国科学院,研究生院,北京,100049 2. 中国科学院,地球化学研究所,矿床地球化学国家重点实验室,贵州,贵阳,550002 3. 贵州省地质矿产局105地质大队,贵州,贵阳,550018 |
| 基金项目： | 国家科技支撑计划，矿床地球化学国家重点实验室自主研究课题 |
| 摘 要： | 簸箕田金矿位于灰家堡背斜东头倾覆端,是灰家堡卡林型金矿田重要的组成部分。金矿床具有低温成矿特征,出现硅化、白云石化、黄铁矿化等围岩蚀变和特征的Au-As-Hg元素组合。成矿期方解石具有MREE富集和正Eu异常特点,显示矿热液是一种MREE相对富集以及具有正Eu异常的还原性流体,来源于深部或至少经历过对富含斜长石源区的水-岩反应。成矿期方解石的δ~(13)C为-6‰～-0.1‰,成矿期后方解石的δ~(13)C为0.2‰～3.2‰,显示成矿期碳来源于地幔碳和地层碳的混合,成矿期后碳主要来自于地层。矿床硫同位素变化于0.73‰～5.86‰,组成均一化较高,具有接近幔源硫的特征,反映了成矿物质可能主要来自于深源岩浆。总之我们推测成矿物质主要来源于深部,在燕山期区域构造作用下沿深大断裂上涌,当成矿流体运移至背斜核部时,由于成矿条件的聚变,金被快速富集沉淀,形成簸箕田金矿床。 |
| 关 键 词： | 稀土元素 同位素 卡林型金矿 贵州 |
REE and stable isotope geochemical characteristics of Bojitian gold deposit, Guizhou Province |
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| Zhang Yu,Xia Yong,Wang Zepeng,Yan Baowen,Fu Zhikang,Chen Ming.REE and stable isotope geochemical characteristics of Bojitian gold deposit, Guizhou Province[J].Earth Science Frontiers,2010,17(2):385. | |
| Authors: | Zhang Yu Xia Yong Wang Zepeng Yan Baowen Fu Zhikang Chen Ming |
| Abstract: | The Bojitian gold deposit is located in the east of Huijiabao anticline and is an important component of Huijiabao ore field. Gold mineralization occurred under low temperature and was closely associated with decarbonation, silicification, sulfidation and dolomitization. The deposit has a characteristic elemental assemblage of Au-As-Hg. Calcite mineralization with MREE enrichment and positive Eu anomalies characteristic show that the ore-forming hydrothermal fluid might be a reductive fluid with a MREE relative enrichment and positive Eu anomalies. The ore-forming fluid mainly originated from a plutonic source, and at least had undergone the fluid-rock interaction for a plagioclase-rich area. The δ~(13)C value of -6‰ - -0.1‰ for the calcite vein formed in the ore-forming stage and the δ~(13)C value of 0.2‰ - 3.2‰ for the calcite vein formed post the ore-forming stage indicate that the carbon in the ore-forming stage was from the mantle and the formation, and that the carbon post the ore-forming stage was from the formation. The δ~(34)S value of realgar varying from 0.73‰ to 5.86‰ with the characteristics of mantle-derived sulfur indicates that the isotopic composition of sulfur of sulfides in the deposit is highly homogeneous. In general, we suggest that the ore-bearing materials and fluids of the gold deposit mainly originated from a plutonic source. In the Yanshan period, the ore-forming fluids upwelled along the deep fault;when they were transported to the anticline core, the ore-forming conditions were greatly changed, which led to the rapid enrichment and precipitation of gold and the formation of the Bojitian gold deposit. |
| Keywords: | REE isotope Carlin-type gold deposit Guizhou |
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