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J4 ›› 2010, Vol. 18 ›› Issue (1): 11-15.

• 矿产勘查 • 上一篇    下一篇

甘肃寨上金矿床的矿石建造特征及成因

刘家军1,毛光剑1,吴胜华1,马星华2,李立兴3,刘光智4,廖延福4,郑卫军4   

  1. 1. 中国地质大学地质过程与矿产资源国家重点实验室,北京   100083;
    2. 北京大学地质学系,北京   100871;
    3. 中国地质科学院矿产资源研究所,北京   100037;
    4. 武警黄金第五支队,陕西  西安   710100
  • 出版日期:2010-02-25 发布日期:2010-04-22
  • 基金资助:

    国家自然科学基金 (编号:40773036)、国家重点基础研究发展规划(编号:2006CB403500)、高等学校学科创新引智计划(编号:B07011)、教育部长江学者和创新团队、中国人民武装警察部队黄金指挥部勘查项目联合资助.

Ore Formation Characteristics and Genesis of the Zhaishang Gold Deposit, Southern Gansu

  1. 1.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing  100083,China;
    2.Department of Geology,Peking University,Beijing   100871,China;
    3.Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing   100037,China;
    4.No.5 Gold Geological Party of CAPF,Xi’an   710100,Shaanxi,China
  • Online:2010-02-25 Published:2010-04-22

摘要:

位于西秦岭礼(县)—岷(县)成矿带西段的寨上金矿床,是近年发现的1个大型微细浸染型金矿。寨上金矿床的矿石建造可分为氧化矿石和原生矿石两大自然类型。其中原生矿石建造又可分为6种:碎裂岩型、碎裂岩化碳质板岩型、碎裂岩化粉砂质及泥质板岩型、碎裂岩化灰岩型、钙质板岩型和强硅化蚀变角砾岩型。根据热液矿脉中矿物特点,可将矿石中矿物共生组合分为少硫化物—石英类、含As黄铁矿—毒砂—石英类、多金属硫化物—石英—白钨矿—方解石类和少硫化物—碲化物—碳酸盐类。在矿床形成过程中,深源热液参与可能对金的活化迁移起到重要作用,构造体制转换使流体稳定体系发生改变而造成金的富集成矿。矿床成因属于中低温热液矿床。

关键词: 矿石建造, 矿物组合, 矿床成因, 寨上金矿床, 甘肃省

Abstract:

Zhaishang gold deposit is a recently discovered large Carlin-type disseminated gold deposit,which is located in the western part of the Min-Li metallogenetic belt,wetern Qinling Mountains.Two main types of ore formation,namely,oxidized ore and primary ore,are recorded in gold ores.According to the differences of ore-host rocks,six types of primary ore formations can be distinguished:cataclasite,cataclastic carbonaceous slate,cataclastic silty slate,cataclastic carbonates,calcareous slate,and intense alternation breccia.Based on the characteristics of the primary ores,mineral assemblages in the gold ores can be divided into four types:assemblages I,represented by the association of minor sulfide-quartz,assemblages II,represented by the association arsenic-bearing pyrite- arsenopyrite-quartz,assemblages III,represented by the common association of polymetallic sulfide-quartz- scheelite -calcite,and assemblages IV,represented by the association minor sulfide-telluride-carbonate such as coloradoite,melonite,calcite,ankerrite,siderite.On the metallogenic process,deep origin (magmatic and/or metamorphic) hypothermal fluids may take a more important role in gold activation,though structural transition leads to gold and sulfides separate out from ore-forming by changing the conditions of the primary well-evolved fluids.The genesis belong to low and middle hydrothermal deposit.

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