西藏那曲县尤卡朗铅银矿床地质特征与成因研究

The Study about The Geological Characteristics and Genesis of Youkalang Pb-Ag Desposits in Tibet

尤卡朗铅银矿床位于北冈底斯群陆后缘退化陆缘弧(盆)褶皱带中部。矿区出露中-上侏罗统拉贡塘组(J2-3l),岩性主要为石英砂岩、钙质细砂岩、砂屑灰岩、粉砂质板岩、含炭粉砂质板岩、炭质板岩等,矿体产于构造破碎带内,赋矿岩石为破碎的泥质岩、碎屑岩和灰岩构成的角砾岩。两条走向NNE、倾向NWW的断层破碎带控矿。综合区域地质背景、矿区地质特征、矿体特征及成矿时代,初步分析了恰功矽卡岩型铁矿床的类型和矿床成因。

Youkalang Pb-Ag Desposits is located in north Gangdise group of land degradation in continental margin arc （basin） after fold belt in central. The strata in the exposed in the mining area is Lagongtang group of middle and Upper Jurassic, the lithology mainly are quartz sandstone, calcareous sandstone and calcarenite, silty slate, containing carbon silty slate and carbonaceous slate, orebody in tectonic fracture zone, ore for broken rock argillaceous rocks, elastic rocks and limestone breccia. Two to NNE, tendency of NWW fault fracture zone controlling. Comprehensive regional geological background, geological characteristics, ore body characteristics and metallogenie epoch, preliminarily analyzed just work skarn type iron ore deposit types and genesis.