| 青海同仁双朋西金铜矿矿床地质特征及矿床成因 |
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| 引用本文： | 薛静,戴塔根,息朝庄.青海同仁双朋西金铜矿矿床地质特征及矿床成因[J].岩石矿物学杂志,2012,31(1):28-38. |
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| 作者姓名： | 薛静 戴塔根 息朝庄 |
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| 作者单位： | 1. 中南大学地球科学与信息物理学院,湖南长沙,410083
2. 湖南金鑫黄金集团有限公司,湖南长沙,410005 |
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| 基金项目： | 973项目(2002CG412607);国家科技攻关项目(2004BA615-02) |
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| 摘 要： | 在翔实的野外工作基础上,对青海省同仁县双朋西金铜矿床矿石与围岩的微量元素、稀土元素、流体包裹体和同位素地球化学特征展开了系统研究。研究结果表明,金矿石和花岗闪长岩的稀土元素配分模式具有相似性,均为轻稀土元素富集型,具负铕异常,基本上无铈异常,暗示它们之间存在成因联系;成矿流体为中高温、低盐度、中等密度、中等压力流体,且以含碳质为特征;铅、硫同位素结果均反映出成矿物质主要来源于深源。据此认为区内矿化是与中高温岩浆热液作用有关的矽卡岩型金铜矿化,属于印支-燕山期同一构造-岩浆作用的产物。
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| 关 键 词： | 地球化学 流体包裹体 金矿床 矽卡岩 双朋西 青海 |
| 收稿时间： | 2010/10/28 0:00:00 |
| 修稿时间： | 2011/9/1 0:00:00 |
Geological features and genesis of the Shuangpengxi gold deposit in Tongren, Qinghai Province |
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| XUE Jing,DAI Ta-gen and XI Chao-zhuang.Geological features and genesis of the Shuangpengxi gold deposit in Tongren, Qinghai Province[J].Acta Petrologica Et Mineralogica,2012,31(1):28-38. |
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| Authors: | XUE Jing DAI Ta-gen and XI Chao-zhuang |
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| Institution: | 1.School of Geoscience and Info-physics,Central South University,Changsha 410083,China;2.Hunan Jinxin Gold Group Ltd.,Changsha 410005,China) |
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| Abstract: | The Shuangpengxi gold deposit,as one of the most important gold deposits in northwest China,is located in the Tongren ore concentration area of Qinghai Province.Gold mineralization occurs within skarn that lies between granodiorite and marble.The ore bodies are in lenticular and veinlike forms.Ores are mainly composed of chalcopyrite,pyrrhotine and pyrite.Gangue minerals comprise diopside,garnet,calcite and sericite.The main types of rock alterations are skarnization,silicification,carbonatization,brecciation and ferritization.The tectonic setting,material source and genesis of the ore deposit are discussed on the basis of trace elements,REE,fluid inclusions and isotope geochemistry of ores and wall rocks as well as characteristics of the ore deposit.Studies show that ores and granodiorite have similar chondrite-normalized REE patterns and are enriched in light REE with a moderate Eu negative anomaly but no Ce anomaly.Microthermometric homogenization measurements of the fluid inclusions show that temperatures are from 215℃ to 468℃,corresponding salinities vary from 1.40% to 13.40% NaCleq,and densities vary from 0.55 g/cm3 to 0.85 g/cm3.The metallogenic pressure is 2.25 MPa~20.61 MPa.and the ore-forming fluids belong to NaCl-KCl-CaCl2-H2O types,especially enriched in CO2,CH4 and C2H2.Sulfur isotopic compositions of sulfides from ores show that the values of δ34S from the early depositional ores range from 2.2‰ to 7.0‰.The 208Pb/204Pb,207Pb/204Pb and 206Pb/204Pb ratios of ores range from 38.19 to 38.53,15.581 to 15.641 and 18.058 to 18.710,respectively.According to the isotopic data,it is considered that the ore-forming materials were derived from the crust and theupper mantle.Studies show that the Shuangpengxi ore deposit might be a skarn gold deposit related to hypo-and mesothermal processes and belongs to the acid and intermediate-acid magmatic activities of Indo-Chinese and Yanshanian period. |
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| Keywords: | geochemistry fluid inclusion gold deposit skarn Shuangpengxi Qinghai |
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