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。
Zhaishang gold deposit is a recently discovered large Carlin-type disseminated gold deposit,which is lo- cated in the western part of the Min-Li metallogenetic belt, wetern Qinling Mountains.Two main types of ore for- mation,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, cataclas- tic 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 meta- morphic） 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.
出处
《黄金科学技术》
2010年第1期11-15,共5页
Gold Science and Technology
基金
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
关键词
矿石建造
矿物组合
矿床成因
寨上金矿床
甘肃省
Ore formation
Mineral association
Genesis
Zhaishang gold deposit
Gansu Province
