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1概况加多沟磁铁矿位于青海省东部地区乐都县,距省会西宁约50 km。矿区北面出露的地层为中元古蓟县系湟中群青石坡组(Jxq),整合于南面中元古蓟县系湟中群磨石沟组(Jxm)变石英质碎屑岩之上,青石坡组为一套灰色薄层粉砂质板岩夹变粉砂岩、钙质板岩、千枚岩、结晶灰岩等浅变质地层,底以巨厚层石英质变碎屑岩的消失与磨石沟组分隔。磨石沟组原生沉积构造有波状层理、交错层理、泥裂、水平层理等,该组自下而上沉积物颜色由灰色变为灰绿色、灰紫色,粒度显示由粗-细-粗的层
1 Overview Gadougou magnetite is located in the eastern part of Qinghai Province Ledu County, about 50 km from the provincial capital of Xining. The exposed strata in the north of the mining area are Jxq, a member of the Middle Proterozoic Jixian Formation and are integrated with Jxm metamorphic quartz clastics in the Middle Proterozoic Jixian Formation. Slope group is a set of gray thin silty slate clayey siltstone, calcareous slate, phyllite, crystalline limestone and other super-metamorphic strata, the bottom of the thick thick layer of quartz metamorphic clastic rock disappears and the grindstone Ditch group separated. The primary sedimentary structures of the Moshitou Formation are wavy bedding, staggered bedding, mud-splitting and horizontal bedding. The sediment color changes from gray to gray-green and purple-gray from bottom to top, Thick layer