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甘肃党河南山某金矿碲化物的发现及其成因探讨

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刘亚非, 周宁超, 魏小燕, 姚珊. 甘肃党河南山某金矿碲化物的发现及其成因探讨[J]. 西北地质, 2015, 48(2): 112-120.
引用本文: 刘亚非, 周宁超, 魏小燕, 姚珊. 甘肃党河南山某金矿碲化物的发现及其成因探讨[J]. 西北地质, 2015, 48(2): 112-120.
shu
LIU Yafei, ZHOU Ningchao, WEI Xiaoyan, YAO Shan. Discovery and Genesis of Telluride in a Gold Deposit from the Danghenanshan Area of Gansu Province[J]. Northwestern Geology, 2015, 48(2): 112-120.
Citation: LIU Yafei, ZHOU Ningchao, WEI Xiaoyan, YAO Shan. Discovery and Genesis of Telluride in a Gold Deposit from the Danghenanshan Area of Gansu Province[J]. Northwestern Geology, 2015, 48(2): 112-120.
shu

甘肃党河南山某金矿碲化物的发现及其成因探讨

  • 1.

    中国地质调查局西安地质调查中心, 陕西 西安 710054

  • 2.

    陕西省地质调查中心, 陕西 西安 710068

  • 基金项目: 中国地质调查局国土资源大调查项目(12120113014500)资助

Discovery and Genesis of Telluride in a Gold Deposit from the Danghenanshan Area of Gansu Province

  • 1.

    Xi'an Center of Geological Survey, CGS, Xi'an 710054, Shaanxi, China

  • 2.

    Shaanxi Center of Geological Survey, Xi'an 710068, Shaanxi, China

    摘要
  • 利用电子探针显微分析技术首次在甘肃党河南山某金矿中发现了碲金银矿、碲银矿、碲金矿、碲铅矿、碲铋矿等碲化物。通过电子探针显微图像观察, 发现研究区碲化物均较为细小, 赋存状态多以独立矿物形式存在, 无连生、交生现象, 但空间上与黄铁矿关系密切, 多被黄铁矿包裹或产于黄铁矿、石英粒间和黄铁矿裂隙。根据不同碲化物与黄铁矿之间的共生组合关系, 推测其形成顺序为碲金矿→碲金银矿→碲铅矿→碲铋矿→碲银矿。依据碲化物矿物组合特征及成矿温度, 对其形成时fTe2与fS2进行了限定, lgfTe2范围为-15.2~>-11.2, lgfS2范围为-16.7~-14.4。并认为金矿中Au、Te来源与加里东期埃达克质斜长花岗岩体有较大联系, 可能为俯冲板片部分熔融形成的埃达克质岩浆与地幔楔相互作用, 将成矿元素富集后带入近地表形成含碲化物的金矿床。
    Based on Electron Probe Micro-Analysis(EPMA), tellurides such as petzite, hessite, calaverite, hessite, tellurbimuth were found in a gold deposit in the Danghenanshan area of Gansu province for the first time. According to electron probe microscopic image observation, these telluride minerals are relatively small and have no intergrowth. However, there is a close relationship between telluride minerals and pyrite. Telluride minerals are mainly included in pyrite and some exists among the grain of pyrite and quartz or the crack of pyrite. Based on the association of different telluride and pyrite, this study speculates that the mineral precipitation sequenceis is calaverite, petzite, hessite, tellurbimuth, and hessite. According to the mineral assemblage characteristics and ore-forming temperature, the values of fTe2 and fS2 during ore forming are limited.The range of lgfTe2 of ore forming fluids is -15.2 to > -11.2 and the range of lgfS2 is -16.7 to-14.4. The source of gold and tellurium significantly associates with adakitic plagiogranite which is formed by the partially melting of subducted slab occurred during the Caledonian.Ore-forming elements are thus concentrated and brought to the near surface to form the telluride-bearing gold deposit.
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收稿日期:  2014-06-19
修回日期:  2015-04-07
刊出日期:  2015-06-15

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