| 江南造山带中段正冲金矿矿床成因:来自流体包裹体和黄铁矿微量元素的证据 |
| |
| 引用本文： | 韩亮,丁俊英,范明森,鲍谈,潘君屹.江南造山带中段正冲金矿矿床成因:来自流体包裹体和黄铁矿微量元素的证据[J].矿物岩石地球化学通报,2021,40(2):382-399. |
| |
| 作者姓名： | 韩亮 丁俊英 范明森 鲍谈 潘君屹 |
| |
| 作者单位： | 内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京210023 |
| |
| 摘 要： | 江南造山带上产出有大量金矿,但其成因存在争议,为厘清其成因,对该造山带上的正冲金矿床中的黄铁矿进行了LA-ICP-MS微量元素分析和流体包裹体研究。结果显示,正冲金矿的流体包裹体有含CO2包裹体、富CO2包裹体和水溶液包裹体,其中富CO2包裹体与水溶液包裹体共存,具有相似的均一温度,但盐度不同,说明流体不混溶可能导致了金的沉淀;正冲金矿不同阶段黄铁矿中的Au与As、Ag、Zn等有协同变化趋势,而Co/Ni<1,说明含金黄铁矿来源于沉积岩。将正冲金矿黄铁矿的微量元素特征与沉积、变质、浅成低温热液环境中形成的黄铁矿的微量元素特征进行对比,发现其与变质低温热液形成的黄铁矿相似,认为其为变质热液成因。研究认为,正冲金矿是一个典型的造山型金矿,其成矿流体为变质流体。
|
| 关 键 词： | 黄铁矿微量元素 流体包裹体 造山型金矿 正冲金矿 华南 |
Genesis of the Zhengchong Gold Deposit in the Central Part of the Jiangnan Orogenic Belt:Evidences from Fluid Inclusions and Trace Elements of Pyrite |
| |
| HAN Liang,DING Jun-ying,FAN Ming-sen,BAO Tan,PAN Jun-yi.Genesis of the Zhengchong Gold Deposit in the Central Part of the Jiangnan Orogenic Belt:Evidences from Fluid Inclusions and Trace Elements of Pyrite[J].Bulletin of Mineralogy Petrology and Geochemistry,2021,40(2):382-399. |
| |
| Authors: | HAN Liang DING Jun-ying FAN Ming-sen BAO Tan PAN Jun-yi |
| |
| Institution: | (State Key Laboratory for Mineral Deposit Research,Institute of Geo-Fluids,School of Earth Science and Engineering,Nanjing University,Nanjing 210023,China) |
| |
| Abstract: | Lots of gold deposits in the Jiangnan orogenic belt were argued to be orogenic or epithermal in origin. In order to clarify their metallogenic origins, we have carried out a case study through the LA-ICP-MS trace element analysis of pyrite and fluid inclusion microthermometry on geochemistry of the Zhengchong gold deposit in the Jiangnan orogenic belt. The results show that there are three types of fluid inclusions including the CO2-bearing fluid inclusions, CO2-rich fluid inclusions, and aqueous fluid inclusions. CO2-rich fluid inclusions and aqueous fluid inclusions, coexisted in the auriferous veins, share similar homogenization temperatures but variable salinities, indicating that the fluid immiscibility could be responsible for the gold precipitation. LA-ICP-MS microanalyses of pyrites suggest that Au and As, Ag, Zn contents in the pyrites of various stages are synergetically changed. The values of Co/Ni for Au-bearing pyrites in the Zhengchong gold deposit are lower than 1, indicating that the pyrite was derived from sedimentary rocks. We Based on the comparison between data of trace elements for pyrites from the Zhengchong gold deposit and those of typical pyrites formed in sedimentary, metamorphic, and epithermal environments, it is inferred that the Zhengchong gold deposit is a typical orogenic gold deposit with its ore-forming fluid of metamorphic hydrothermal origin. |
| |
| Keywords: | trace elements of pyrite fluid inclusion orogenic gold deposit Zhengchong gold deposit South China |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
