陕西省洛南县小秦岭西段镰子沟金矿矿床地质特征

发布时间：2018-04-04 12:50

  本文选题：小秦岭西段　切入点：镰子沟　出处：《长安大学》2015年硕士论文

【摘要】：工作区位于华北地台南缘豫西断隆之小秦岭金矿带西段。出露地层主要为太古界太华群秦仓沟组和南部中元古界高山河组,高山河组呈角度不整合覆盖于秦仓沟组之上。工作区位于大月坪-金罗斑复背斜南翼,呈单斜构造。太华群秦仓沟组片麻理走向北西,倾向北北东-北东,中等-较陡倾角,南部高山河组地层倾向南东,中等-较缓倾斜。断裂构造发育,以北东-北北东向断裂为主。镰子沟金矿床矿体均赋存于该组断裂带中。区内未见岩浆岩出露,脉岩较发育,主要有辉绿岩、正长斑岩、钾长伟晶岩等。工作区内圈出矿化蚀变带9条,其产状与北东-北北东向断裂构造基本一致,空间上呈大致平行展布。矿化蚀变带中均有金矿体存在。通过地质勘查,圈定7个工业矿体,即Ⅲ-1、Ⅱ-2、Ⅱ-1、Ⅴ、Ⅳ、Ⅵ、Ⅺ号矿体,其中Ⅲ-1、Ⅱ-2号矿体具有较大规模,是矿床主要工业矿体。矿体形态较简单,多为脉状、似脉状、透镜状。规模大小不等,长度55m-550m,厚度1.4m-1.6m,矿体品位1.6 g/t-2.8g/t。围岩蚀变以硅化、绢英岩化、黄铁矿化、方铅矿化、钾化、碳酸盐化、绿泥石化为主。矿石中贵金属矿物为自然金,其次为黄铁矿,方铅矿,再次为碲铅矿和黝铜矿,脉石矿物主要为石英,其次是钾长石和方解石。金主要以粒间金、裂隙金和包裹金的形式存在。矿石结构以粒状结构、压碎结构为主。矿石构造主要为碎裂状、块状、浸染状构造。矿石自然类型主要为蚀变岩型、石英脉型。
[Abstract]:The working area is located in the west section of the Xiaoqinling gold belt in the west of Henan Province on the southern margin of the North China platform.The outcropping strata are mainly the Qinchanggou formation of Taihua Group in the Archaean and the Gaoshanhe formation of the Middle Proterozoic in the south, and the Gaoshanhe formation covers the Qinchanggou formation at an angle unconformity.The working area is located in the south wing of the Dayue Ping-Jinluoban complex anticline, with monoclinic structure.Fault structure developed, NNE-NNE trending fault dominated.The orebodies of the Xiucigou gold deposit occur in the fault zone.Magmatic rocks are not exposed and dikes are relatively developed in the area, mainly diabase, syenite porphyry, kalium feldspar and so on.There are 9 mineralization alteration zones in the working area, which are consistent with the NNE-NNE fault structure and are distributed in parallel in space.Gold ore bodies exist in all mineralization alteration zones.Through geological exploration, seven industrial orebodies, i.e. 鈪，

本文编号：1710020