新疆柯坪地区一间房重晶石矿地球化学特征及前景分析

Geochemical characteristics and prospecting perspective analysis of Yijianfang barite deposit in Keping area,Xinjiang

新疆柯坪地区位于塔里木陆块区,属于柯坪塔格成矿亚带的重要组成部分,成矿地质条件良好,找矿潜力较大。为进一步查明其控矿因素及找矿远景,在对一间房重晶石矿区地质特征进行详细调查的基础上,开展了1∶5万水系沉积物测量和1∶2.5万土壤测量等化探扫面工作。结果表明:1∶5万水系沉积物测量圈定出Ba(Zn)综合异常1处,1∶2.5万土壤测量圈定出土壤综合异常3处,这些异常区与柯坪塔格逆冲断裂和下奥陶统丘里塔格组在空间上具有较好的吻合关系。由此表明,研究区内重晶石矿的赋矿层位为下奥陶统丘里塔格组,而逆冲推覆断裂构造控制了地层的总体展布,进而影响了层控型矿体的分布和矿脉的产出形态,为本区乃至整个柯坪塔格成矿亚带重晶石矿等的地质找矿指明方向。

Keping area in Xinjiang is located in the Tarim block,which is an important part of Kepingtag metallogenic sub-belt.It has the good metallogenic and geological condition with a great prospecting potential.In order to further find out the ore controlling factor and prospecting perspective,on the basis of a detailed investigation of the geological characteristics of Yijianfang barite mining area,1∶50,000 geochemical stream sediment survey and 1∶25,000 geochemical soil survey are carried out.The result shows that 1∶50,000 stream sediment survey delineates one comprehensive anomaly of Ba(Zn)and 1∶25,000 soil survey delineates three comprehensive anomalies of soil,which are in a good agreement with the Kopingtag thrust fault and the Early Ordovician Qiulitag Formation in space.The result indicates that the orebearing stratum of barite mineraliztion in the study area is the Early Ordovician Qiulitag Formation,while the reverse thrusting fault structure controls the overall distribution of the stratum,and then affects the distribution of stratum-controlled orebody and the output form of ore vein.It has provided the direction for the geological prospecting of barite deposit in this area and even the whole Kepingtag metallogenic sub-belt.