新疆阿舍勒铜矿区地质特征及三维成矿预测

Geological Characteristics and Three-dimensional Metallogenic Prognosis of Ashele Copper Deposit in Xinjiang

为明确新疆阿舍勒铜矿区的找矿前景,详细分析了区域成矿地质背景、矿区地质特征及矿床地质特征。基于三维地质建模成矿预测理论,采用三维地质建模技术,利用Surpac软件构建了三维矿化域数字模型。根据块体模型Cu品位平面(XY)、纵剖面(XZ)、横剖面(YZ)投影等值线图,对铜矿化空间分布规律进行了分析。结果表明:铜矿化呈SSE—NNW走向,高品位矿化的连续性相对于低品位矿化差,高品位矿化呈不规则状、透镜状分布;铜矿化主要分布于760～840 m标高,高品位铜矿化具有缓倾性分布特征;矿区铜矿化由北向南具有向深部延伸的特点。根据上述分析,圈定了3处找矿靶区,通过对矿区进行1∶20 000土壤地球化学测量,发现了一条走向118°、长3.15 km、宽300～400 m的铜异常带,该异常带伴有锑、砷、金、银异常,多个异常区域呈串珠状分布,与所圈定的找矿靶区吻合性较高。

In order to clarify the prospecting prospect of Ashele Copper Deposit in Xinjiang, the regional metallogenic geological background, geological characteristics of the mining area and deposit are analyzed in detail.Based on three-dimensional geological prospecting prognosis theory, the three-dimensional geological modeling technique and Surpac software are adopted, three-dimensional numerical model of mineralized areas is established.According to the projection contour maps of plane section （XY）,longitudinal section （XZ） and transverse section （YZ） of Cu grade of the block model, the copper mineralization spatial distribution regularities is studied.The results show that the copper mineralization distributed with SSE-NNW direction, the continuity of copper mineralization with high grade is inferior to the continuity of copper mineralization with low grade, the copper mineralization with high grade is distributed with irregular and lenticular shapes ; copper mineralization in the mining area is mainly distributed at the elevation of 760-840 m, the copper mineralization with high grade is characterized by gentle slope distribution; copper mineralization of the mining area has the characteristics of extending to the deep from north to south.Based on the above analysis results, three prospecting targe areas are delineated, through the 1 ： 20 000 soil geochemical survey, the 118° trending copper anomaly belt with the length of 3.15 km and the width of 300～400 m is found, besides that, the anomaly belt is accompanied with Sb, As, Au and Ag anomalies, the above anomalies are distributedwith moniliform shape, which is basically consistent to the prospecting target areas delineated in this paper.