| 甘肃大水金矿床成矿流体特征与来源 |
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| 引用本文： | 代文军,陈国忠,马小云.甘肃大水金矿床成矿流体特征与来源[J].甘肃地质学报,2009(1):21-27. |
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| 作者姓名： | 代文军 陈国忠 马小云 |
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| 作者单位： | 甘肃地矿局第三地勘院;中国地质大学; |
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| 基金项目： | 致谢：本文在成文过程中引用了闫升好（1998）甘肃大水特大型富赤铁矿硅质岩型金矿床成因研究（研究生毕业论文）及王平安,董法先,刘晓春等（2001）甘肃南部及邻区金铜成矿条件矿床勘查模型及找矿靶区优选中的有关数据.在此表示衷心的感谢! |
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| 摘 要： | 产于西秦岭南缘的大水金矿是一个新型金矿床。作者在前人研究的基础上,通过对大水金矿床流体包裹体的较系统研究认为,大水金矿床的方解石中的包裹体以气液包裹体为主。流体包裹体气相成分的CH4、CO、H2的含量反映属氧化环境;液相成分中阴离子以SO42-为主,Cl-次之;阳离子以K＋为主,Na＋次之。Au在成矿流体中以AuSO42-络合物的形式迁移。矿床成矿温度为120℃～220℃,属中低温范畴。w（NaCleq）盐度为2.7%～9.1%,密度为0.875～0.970g/cm3。流体水的δD值为-101‰～-61‰,δ18O（SMOW）为-0.3‰～19.42‰,δ18OH2O为-4.32‰～8.33‰,显示早期成矿流体来源于岩浆水,晚期成矿流体为岩浆水与大气降水的混合;δ13C值趋向热液成因。综合分析认为该矿床为一层控—浅成-超浅成岩浆期后中低温热液交代型金矿床,为多次构造—岩浆作用的产物。
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| 关 键 词： | 流体包裹体 金矿床 西秦岭 甘肃大水 |
FEATURES AND ORIGIN OF METALLOGENETIC FLUID OF DASHUI GOLD DEPOSIT IN GANSU PROVINCE |
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| DAI Wen-jun,CHEN Guo-zhong and Ma Xiao-yun.FEATURES AND ORIGIN OF METALLOGENETIC FLUID OF DASHUI GOLD DEPOSIT IN GANSU PROVINCE[J].Acta Geologica Gansu,2009(1):21-27. |
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| Authors: | DAI Wen-jun CHEN Guo-zhong and Ma Xiao-yun |
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| Affiliation: | 1.No.3 Geology and Mineral Exploration Team;Gansu Provincial Bureau of Geology and Mineral Exploration and Development;Lanzhou 730050;China;2.Faculty of Earth Resources;China University of Geosciences;Wuhan 430074;China |
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| Abstract: | Dashui gold deposit is located in the south margin of west Qinling.On the basis of the study done by former experts,after studying systematically fluid inclusions of deposit,the authors supposes that the most in-clusions within calcite are gaseous and fluid inclusions.In the inclusions contained gaseous composition include CH4,CO and H2,which indicate the oxidizing environment,and the fluid composition is composed of anions as SO4-2 first and Cl-second,cations as K+ first,Na+ second.Au migrated in the compl... |
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| Keywords: | fluid inclusions gold deposit West Qinling Dashui of Gansu Province |
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