甘肃省瓜州县龙山金矿地质特征

The Geological Features of Longshan Gold Mine in Gansu Province

矿区所处大地构造位置为天山-内蒙褶皱系(Ⅰ),北山褶皱带(Ⅱ),南北山华力西槽向斜褶皱带(Ⅲ),红柳园-音凹峡复向斜(Ⅳ)的北翼,加里东期辉铜山-五峰山褶凹的南侧。矿区出露地层为奥陶系花牛山群(Oh^(b-2))上岩组片岩类,以及分布于矿区南部的下二叠统哲斯群(P1zs1),与奥陶系花牛山群呈断层接触。主要岩性为变砂岩、含炭硅质板岩。矿床产于大断裂及伴生的次级断裂裂隙中,分布于奥陶系花牛山群上岩组片岩类、中酸性岩中,以及与下二迭统哲斯群变砂岩、含炭硅质板岩的接触部位。矿床为破碎带蚀变岩型和石英脉型金矿。

Mining area locates the geotectonic position of tianshan mountain - Inner Mongolia fold system （ Ⅰ ）, beishan fold belt （ Ⅱ ）, north and south mountain variscan slot syncline fold belt （ Ⅲ ）, red LiuYuan - sound concave gorge synclinorium （ IV ） north wing, caledonian period fai tongshan - text plait at the south side of concave.Mine out outdoor layer to pay down on the ordovician group （ Ohb - 2） on the petrofabric schist, and distributed in the mining area in the south of the lower Permian zhe group （Plzsl）, contact with the ordovician flowers down group in fault. Mainly lithologic sandstone containing carbon, siliceous SLATE. Deposits are found in large fracture and secondary fracture associated fractures, distributed in the ordovician goes down group of petrofabric schist, acid rock, and the lower two overlapping zhe, a group of sandstone containing carbon, siliceous SLATE of contact area. Deposit of fracture zone altered rock type and quartz vein type gold deposit.