大姚六苴铜矿床成矿作用及找矿标志

Mineralization and Prospecting Criteria of Dayao Liuju Copper Deposit

大姚六苴铜矿区位于楚雄盆地东部,是典型的砂岩型铜矿床。该矿床矿体主要赋存于下白垩统高峰寺组凹地苴段和上白垩统马头山组六苴段下亚段的灰色长石石英砂岩中。矿体多呈层状、透镜状,与地层产状一致。矿床成矿地质体为高孔隙度岩石组合+构造+盆地流体。S-H-O同位素结果显示成矿流体主要为盆地流体。褪色化长石石英砂岩、褶皱构造+断裂构造和地球化学异常可以作为该矿床的主要找矿标志。喜山运动形成大雪山背斜,在东西向挤压应力驱动下,还原性成矿流体由深部向大雪山背斜轴部运移,沿着流体运移方向,其流体温度、压力、性质等物理化学参数不断变化,形成黄铜矿、斑铜矿和辉铜矿等硫化物。

Dayao Liuju mining district is located in the east part of the Chuxiong basin,it is a typical sandstone-type copper deposit.The ore body of the deposit is mainly storage in grey feldspar quartz sandstone of the lower Cretaceous Gaofeng Temple Formation concave tho section and the lower sub-member of the Liutho member of the Upper Cretaceous Matoushan Formation.The ore body presents stratiform and lenticular form,which is consistent with the attitude of stratum.The deposit metallogenic geological body is the high porosity rocks assemblage+structure+basin fluids.S-H-O isotope results show the ore-forming fluids mainly is the basin fluids.Fading feldspar quartz sandstone,fold structure+fracture structure,and abnormal geochemical can be taken as the main prospecting criteria.Snowy mountain anticline formed by Himalayan orogeny,under the east-west compressive stress-driven,the reducibility ore-forming fluids moves from deep part to Snowy mountain anticline axial movement along with the direction of fluids movement,the temperature,pressure,performance,and the other physicochemical parameters of fluids changes constantly,it forms copper pyrites,bornite,chalcocite,and the other sulphide.