| 安徽省金寨县沙坪沟钼矿床稳定同位素地球化学特征 |
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| 引用本文： | 陆三明,李建设,阮林森,赵丽丽,黄凡,王波华,张怀东.安徽省金寨县沙坪沟钼矿床稳定同位素地球化学特征[J].现代地质,2019,33(2):262-270. |
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| 作者姓名： | 陆三明 李建设 阮林森 赵丽丽 黄凡 王波华 张怀东 |
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| 作者单位： | 1.安徽省公益性地质调查管理中心,安徽 合肥 2300912.中国地质科学院 矿产资源研究所,北京 1000373.安徽省地质矿产勘查局 313地质队,安徽 六安 237010 |
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| 基金项目： | 安徽省公益性地质(科技)工作项目(2009-g-19);安徽省国土资源科技项目(2011-k-1) |
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| 摘 要： | 安徽省金寨县沙坪沟钼矿床是近年来秦岭—大别成矿带发现的超大型斑岩钼矿床,已探明钼资源储量246×10~4t。通过对沙坪沟钼矿床不同勘探线剖面和不同深度代表性样品的S、H、O稳定同位素地球化学的研究,揭示了沙坪沟钼矿床S、H、O同位素组成特征及其空间分布特征。矿床硫化物硫同位素组成变化范围较窄,δ34S变化于+0.4‰～+6.2‰,平均值为+3.47‰,落在火成岩范围,分布具明显的塔式效应,硫的来源比较均一,主要为深源硫。成矿流体的δ18O包裹体水为0.40‰～7.52‰。流体包裹体中δD变化范围为-90‰～-63‰。主成矿期成矿流体总体为岩浆水。在不同勘探线剖面上矿化中心具高的δ34S、δ18O值,而且显示出从深部钠长石—钾长石—硅化带→黄铁绢英岩化带→浅部的绿泥石—碳酸盐化带δ34S、δ18O值有降低的趋势。上述特征表明沙坪沟钼矿床主成矿期成矿环境由碱性向酸性过渡,且没有发生明显的低δ18O作用,成矿环境相对封闭,外部对流循环的雨水系统参与成矿作用程度相对较小,与东秦岭其他斑岩钼矿床不同。
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| 关 键 词： | 沙坪沟 钼矿床 稳定同位素 成矿流体 安徽省 |
| 收稿时间： | 2018-06-01 |
| 修稿时间： | 2018-12-15 |
The Characteristics of Stable Isotope Geochemistry of Shapinggou Molybdenum Deposit,Anhui Province |
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| LU Sanming,LI Jianshe,RUAN Linsen,ZHAO Lili,HUANG Fan,WANG Bohua,ZHANG Huaidong.The Characteristics of Stable Isotope Geochemistry of Shapinggou Molybdenum Deposit,Anhui Province[J].Geoscience——Journal of Graduate School,China University of Geosciences,2019,33(2):262-270. |
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| Authors: | LU Sanming LI Jianshe RUAN Linsen ZHAO Lili HUANG Fan WANG Bohua ZHANG Huaidong |
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| Institution: | 1. Public Geological Survey Management Center of Anhui Province, Hefei, Anhui 230091,China2. Institute of Mineral Resources, China Academy of Geological Sciences, Beijing 100037,China3. No. 313 Geological Party of Anhui Bureau of Geology and Mineral Exploration, Lu’an, Anhui 237010, China |
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| Abstract: | Shapinggou molybdenum deposit, Jinzhai County, Anhui Province, is a super large porphyry molybdenum deposit discovered in the Qinling-Dabie metallogenic belt in recent years. The proven reserves of molybdenum resources are 246×104 t. The S, H, O stable isotopes for representative samples from different prospecting line sections at various depths were analyzed in this paper. The sulfur isotopic composition of sulfides in the ore deposit varies in a narrow range from +0.4‰ to +6.2‰. The average value is +3.47‰ within the range of igneous rocks, showing Gaussian distribution in histogram. The source of sulfur is relatively uniform , mainly deep sourced sulfur. The δ18O value of ore-forming fluid inclusions ranges from 0.40‰ to 7.52‰, and δD value of fluid inclusions ranges from -90‰ to -63‰, which suggest that ore-forming fluid for main mineralization resulted from magma. High δ34S and δ18O values correspond to mineralization central zone at various prospecting line sections. Besides, the δ34S and δ18O values have a decreasing tendency from albite feldspar-potassium feldspar-silicified zone, beresitization zone to chlorite-carbonation zone. The above characteristics indicate that the geochemical environment of ore-forming fluid of Shapinggou molybdenum deposit changed from alkaline into acidity during the main ore-forming period. There is no obvious low δ18O effect, the ore-forming occurred in a quite closed environment, and meteoric water with external convection circulation is relatively less involved in the mineralization. The geochemical environment is different from other porphyry molybdenum deposits in the East Qinling district. |
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| Keywords: | Shapinggou molybdenum deposit stable isotope ore-forming fluid Anhui Province |
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