| Simulating experiment on the hydrothermal superimposing metallogenesis of the Dongguashan strata-bound copper deposit |
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| 作者姓名： | 徐兆文 华明 陆现彩 杨小男 饶冰 王云建 蒋少涌 陆建军 聂桂平 黄顺生 |
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| 作者单位： | The State Key Laboratory of Mineral Deposit Research Department of Earth Sciences，Nanjing University，Geological Survey of Jiangsu Province，The State Key Laboratory of Mineral Deposit Research，Department of Earth Sciences，Nanjing University，The State Key Laboratory of Mineral Deposit Research，Department of Earth Sciences，Nanjing University，The State Key Laboratory of Mineral Deposit Research，Department of Earth Sciences，Nanjing University，The State Key Laboratory of Mineral Deposit Research，Department of Earth Sciences，Nanjing University，The State Key Laboratory of Mineral Deposit Research，Department of Earth Sciences，Nanjing University，The State Key Laboratory of Mineral Deposit Research，Department of Earth Sciences，Nanjing University，Geological Survey of Jiangsu Province，Geological Survey of Jiangsu Province，Nanjing 210093，China，Nanjing 210018，China，Nanjing 210093，China，Nanjing 210093，China，Nanjing 210093，China，Nanjing 210093，China，Nanjing 210093，China，Nanjing 210093，China，Nanjing 210018，China，Nanjing 210018，China |
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| 基金项目： | Acknowledgements This work is supported by the National Natural Science Foundation of China （No. 49873016） and the Ph. D Program Foundation of Education of China （Nos. 20020284035, 20050284043）. |
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| 摘 要： | Series of sedimentary hydrothermal-diplogenetic copper deposits have been found scattering in the region along the middle-lower reaches of the Yangtze River, and their metallogenetic mechanism is still in hot debate. In order to reveal the ore-forming kinetics of sedimentary process and hydrothermal superimposition, and evaluate the role of sedimentary pyrite in the enrichment and precipitation of copper, a set of simulating experiments on the reaction between pyrite and CuCl2 solution were conducted. According to the physicochemical characteristics of the ore-forming fluid of the Dongguashan copper deposit, Anhui Province, 100 MPa was selected as the experimental pressure, and the experimental temperatures were set at 450, 350, 250 and 150°C, respectively. The reactions between pyrite grains isolated from the Shimenkou strata-bound pyrite deposit and the solution with 0.2 mol/L CuCl2 and 1.0 mol/L NaCl were experimentally simulated. Then, variations in surface topography and surface chemistry of the experimental pyrite grains were documented using scanning electronic microscopy (SEM), atomic force microscopy (AFM), Auger electron spectrometry (AES) and X-ray photoelectron spectroscopy (XPS), and the solution and newly formed minerals were analyzed using inductively coupled plasma (ICP-AES) and X-ray diffraction (XRD) techniques. Desulphurization of pyrite surface was observed and new copper minerals were detected. It is proposed that pyrite can act as a geochemical barrier for the enrichment and precipitation of copper from the solution under the experimental conditions. Furthermore, the ore-forming mechanism of sedimentary hydrothermal-diplogenetic copper deposits was discussed.
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| 关 键 词： | 冬瓜山层控铜矿床 水热叠加 成矿作用 模拟实验 |
| 收稿时间： | 2006-01-09 |
| 修稿时间： | 2006-04-25 |
Simulating experiment on the hydrothermal superimposing metallogenesis of the Dongguashan strata-bound copper deposit |
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| Xu?Zhaowen,Hua?Ming,Lu?Xiancai,Yang?Xiaonan,Rao?Bing,Wang?Yunjian,Jiang?Shaoyong,Lu?Jianjun,Nie?Guiping,Huang?Shunsheng.Simulating experiment on the hydrothermal superimposing metallogenesis of the Dongguashan strata-bound copper deposit[J].Chinese Journal of Geochemistry,2007,26(1):72-79. |
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| Authors: | Xu Zhaowen Hua Ming Lu Xiancai Yang Xiaonan Rao Bing Wang Yunjian Jiang Shaoyong Lu Jianjun Nie Guiping Huang Shunsheng |
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| Institution: | (1) The State Key Laboratory of Mineral Deposit Research, Department of Earth Sciences, Nanjing University, Nanjing, 210093, China;(2) Geological Survey of Jiangsu Province, Nanjing, 210018, China |
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| Abstract: | Series of sedimentary hydrothermal-diplogenetic copper deposits have been found scattering in the region along the middle-lower
reaches of the Yangtze River, and their metallogenetic mechanism is still in hot debate. In order to reveal the ore-forming
kinetics of sedimentary process and hydrothermal superimposition, and evaluate the role of sedimentary pyrite in the enrichment
and precipitation of copper, a set of simulating experiments on the reaction between pyrite and CuCl2 solution were conducted. According to the physicochemical characteristics of the ore-forming fluid of the Dongguashan copper
deposit, Anhui Province, 100 MPa was selected as the experimental pressure, and the experimental temperatures were set at
450, 350, 250 and 150°C, respectively. The reactions between pyrite grains isolated from the Shimenkou strata-bound pyrite
deposit and the solution with 0.2 mol/L CuCl2 and 1.0 mol/L NaCl were experimentally simulated. Then, variations in surface topography and surface chemistry of the experimental
pyrite grains were documented using scanning electronic microscopy (SEM), atomic force microscopy (AFM), Auger electron spectrometry
(AES) and X-ray photoelectron spectroscopy (XPS), and the solution and newly formed minerals were analyzed using inductively
coupled plasma (ICP-AES) and X-ray diffraction (XRD) techniques. Desulphurization of pyrite surface was observed and new copper
minerals were detected. It is proposed that pyrite can act as a geochemical barrier for the enrichment and precipitation of
copper from the solution under the experimental conditions. Furthermore, the ore-forming mechanism of sedimentary hydrothermal-diplogenetic
copper deposits was discussed. |
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| Keywords: | pyrite hydrothermal-diplogenetic copper deposit surface mineral geochemical barrier experimental simulation Dongguashan copper deposit |
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