Discussion on Geological Characteristics and Ore-Controlling Factors of the Yangxie Gold Deposit in Shangluo,Shaanxi Province
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摘要: 陕西杨斜金矿床为东秦岭杨斜-丰北河金钨成矿带东段的一中型金矿床。金矿体主要为热液石英脉型，赋存于商丹断裂带内北东—北北东与北西—北北西向次级断裂中，赋矿围岩为新元古代杨斜片麻岩套。矿石金属矿物为黄铁矿-自然金-黄铜矿-黝铜矿-闪锌矿-方铅矿等中低温组合；热液成矿过程可划分钾长石-石英、石英-粗粒黄铁矿-自然金、石英-细粒黄铁矿-自然金-多金属硫化物和碳酸盐4个阶段；近矿围岩蚀变以钾化、硅化及黄铁矿化为特征，远矿蚀变主要为绿泥石化和碳酸盐化。金矿床主要受断裂、围岩及岩体（脉）控制，成矿时代不早于晚三叠世。Abstract: Yangxie gold deposit is a medium-sized one located in the eastern section of the Yangxie-Fengbeihe Au-W metallogenic belt, East Qinling.The gold orebodies are mainly composed of gold-bearing quartz veins controlled by NE-NNE and NW-NNW trending faults and hosted in the Neoproterozoic Yangxie gneiss suite in Shangdan fault.Metal minerals in the ore are medium-low temperature mineral associations, and mainly consist of pyrite, native gold, chalcopyrite, tetrahedrite, sphalerite and galena.The process of the hydrothermal ore-forming can be divided into four metallogenic stages:thepotassium feldspar-quartz stage, the quartz-coarse grained pyrite-native gold stage, the quartz-fine grained pyrite-native gold-polymetallic sulfide stage and the carbonate stage.The proximal wall-rock alterations are characterized by potassic alteration, silification and pyritization, while the distal alterations are dominated by chloritization and carbonation. The Yangxie gold deposit is mainly controlled by the faults, the wall-rock and the Indosinian granite;its metallogenic age is no earlier than the Late Triassic.
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Key words:
- geological characteristics /
- ore-forming factor /
- genesis /
- Yangxie gold deposit /
- Shaanxi
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