地学前缘 ›› 2010, Vol. 17 ›› Issue (2): 385-395.

• 论文 • 上一篇    下一篇

贵州簸箕田金矿单矿物稀土元素和同位素地球化学特征

张瑜, 夏勇, 王泽鹏, 闫宝文, 付芝康, 陈明   

  1. 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
    2中国科学院 研究生院, 北京 100049
    3贵州省地质矿产局105地质大队, 贵州 贵阳 550018
  • 收稿日期:2010-02-08 修回日期:2010-03-03 出版日期:2010-03-15 发布日期:2010-04-05
  • 作者简介:张瑜(1985—),男,硕士研究生,从事矿床地球化学研究。E-mail:haishuixing2@163.com
  • 基金资助:

    国家科技支撑计划课题(2006BAB01A13);矿床地球化学国家重点实验室自主研究课题(矿研专2008.32)

 REE and stable isotope geochemical characteristics of Bojitian gold deposit, Guizhou Province.

ZHANG  Yu, JIA  Yong, WANG  Ze-Feng, YAN  Bao-Wen, FU  Zhi-Kang, CHEN  Meng   

  1. 1State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
    2Graduate School of Chinese Academy of Sciences, Beijing 100049, China
    3Geological Party 105, Guizhou Provincial Bureau of Geology and Mineral Exploration & Development, Guiyang 550018, China
  • Received:2010-02-08 Revised:2010-03-03 Online:2010-03-15 Published:2010-04-05

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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δ13C为-6‰～-0.1‰，成矿期后方解石的δ13C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

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 δ13C value of -6‰-01‰ for the calcite vein formed in the oreforming stage and the δ13C 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 δ34S 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.

Key words: REE, isotope, Carlintype gold deposit, Guizhou

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