新疆且日克其菱铁矿床地质特征

Geologocal Characterastics in Qirikeqi Siderite Deposit Xinjiang Province

且日克其菱铁矿床位于西昆仑金属成矿省布伦口-桑株塔格多金属成矿带西端,是一大型铁矿床。矿床赋存于下志留统温泉沟群(S1w)底部,矿体围岩主要为石英片岩、大理岩,矿体形态为透镜状、似层状,单个矿体长180～325m,厚一般10～70m,矿石矿物主要为菱铁矿,脉石矿物主要为石英、白云母、和铁白云石和少量黄铁矿和黄铜矿等。矿石平均品位为TFe45.07%,属高炉富矿。(CaO+MgO)/(SiO2+Al2O3)比值平均0.29,属酸性铁矿石。矿石主要呈粗粒自形-半自形结构、致密块状构造、条带状构造;矿石类型主要为块状矿石、其次为条带状矿石;矿床层控性明显,成因类型属于喷流沉积矿床(SEDEX)。

Qirikeqi Siderite Deposit is located in the Bulunkou-Sangzhutage polymetallic metallogenic belt , West Kunlun metallogenic province,Which is a large iron deposit. The deposit occurs in the low Silurian Wenquangou group （S1w）.The mainly wall rocks are Quartz schist, Marble.The form of orebody is mainly lensed, strataed ,The length of orebodies generally ranges from 180m to-325m,thickness in between 10-70m. The ore minerals are mainly siderite,Gangue minerals are mainly quartz, muscovite, dolomite and a small amount of pyrite and chalcopyrite, etc. The average grade of the ore TFe45.07 % ,which belongs to high grade blast furnace.The average ratio of （CaO ＋ MgO）/（SiO2＋Al2O3）is 0.29 ,shows that it belongs to acid iron orebody.The automorphic ,hypidiomorphic textures are the main ore textures,and the massive structure and zonal structure are the main ore structures.The main oretypes consist of massive ores, banded ores took the second place.h is characterized by stratabound.The genetic type belongs to sedimentary exhalative siderite deposit （SEDEX 型 ）.