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甘肃天水秦州区猪波沟金矿地质特征及找矿标志

         

摘要

The Zhubogou Gold Mine in Qinzhou District belongs to the North Qinling Chaijiazhuang-Pangjiahe gold and polymetallic metallogenic belt and the Middle Qinling Liba gold metallogenic belt. The magmatism in the area is frequent, the hydrothermal alteration is strong, and the capacity ore and mineral structure are developed. In this paper, through the field observation and finishing the geological characteristics of the survey area, it is believed that the ore-forming material of the Zhubogou Gold Mine is derived from the Paleozoic Danfeng Formation Devonian Shujiaba Formation and the nearby intrusive rock mass and the thermodynamic power of mineralization comes from the participation of magmatic hydrothermal, metamorphic hydrothermal and groundwater, and the mineralization roles include both metasomatism and cavity filling, and the metasomatism is the main the mineralization role. Therefore, the deposit is considered to have the characteristics of composite hydrothermal deposits. In the exploration area, the Chlorite clove and quartz serpentine schist in Lower Paleozoic Danfeng group large grass dam group and black bay group and the silty slate, quartz sandstone and feldspar quartz sandstone in the second, third and fourth lithologic layers of the first section of the Devonian Shujiaba Formation are the favorable lithology andlithology signs for looking for gold. The enlargement site and fracture intersection of the north east fault fracture zone and the secondary fracture parallel to the fracture branch are the storage space of gold and silver mine. The land developed with pyrite mineralization, brass mineralization and silicification is the main occurrence site. The relationship between quartz veins distributed in nearly north-south direction and gold mineralization is extremely close.%秦州区猪波沟金矿分属北秦岭柴家庄-庞家河金及多金属成矿带和中秦岭李坝金成矿带,区内岩浆活动频繁,热液蚀变强烈,容矿、导矿构造发育.本文通过野外观察和室内整理勘查区的地质特征,认为猪波沟金矿的成矿物质来源于古生代丹凤群泥盆纪舒家坝组和附近的侵入岩体,成矿的热动力来自于岩浆热液和变质热液加之地下水的参与,成矿作用以交代和充填两种成矿作用共存,以交代作用为主.故此,认为该矿床具有复合热液型矿床特征.勘查区出露的下古生界丹凤群大草坝组、黑湾里组中的绿泥绢云石英片岩及绢云母石英片岩和泥盆纪舒家坝组第一性段第二、三、四岩性层中的粉砂质板岩、石英砂岩、长石石英砂岩是找金的有利岩相、岩性标志;北东向断层破碎带以及断裂旁侧与其平行的分支的次级断裂的膨大部位、断裂交汇部位是金银矿的储矿空间;黄铁矿化、黄铜矿化与硅化共同发育的地段是矿体主要赋存的地段;近南北向展布的石英脉与金矿化关系极为密切.

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