新疆乌恰萨热克铜矿北矿带库孜贡苏组沉积相、古流向、物源区及其找矿意义——来自砾石统计分析的证据

萨热克盆地库孜贡苏组是萨热克铜矿的赋矿层位,开展沉积相、物源区及古流向研究对隐伏铜矿的勘探具有重要意义。选取萨热克铜矿北矿带库孜贡苏组地表矿化最好的砾岩展开砾石统计分析,结果表明,偏斜度显示砾岩为冲积扇相沉积,砾石叠瓦状和砂岩斜层理产状统计显示古流向为北北东向;砾石成分主要为石英、石英砂岩、砂岩,石英岩等;粒度分布呈宽峰态或尖峰态;物源区为元古宇长城系阿克苏群变质岩剥蚀区;物源补给分为主河流补给和支河流补给2种方式。冲积扇相、古流向、物源区分析确定了矿体的范围、最优的勘探线布置方位和潜在的找矿靶区,具有很好的勘探意义。

Sedimentary facies, paleocurrent, provenances and prospecting significance of Kuzigong-su Formation in the northern ore belt of the Sareke copper deposit in Wuqia, Xinjiang: Evidence from gravel statistic analy-sis

The Late Jurassic Kuzigongsu Formation in the Sareke Basin is the ore-bearing horizon of the Sareke copper deposit, and its sedimentary facies, provenance and palaeocurrent direction are of important significance for the exploration of the concealed cop-per deposits. The authors selected the best surface mineralized conglomerate of the Late Jurassic Kuzigongsu Formation located in the northern ore belt of Sareke basin to conduct statistical analysis of gravel. Some results were obtained:the skewness of the gravel shows that it is of alluvial fan facies; attitude statistics of the imbricated gravel and sandstone oblique bedding show that the paleocurrent was in NNE direction; components of gravel are quartz, quartz sandstone, sandstone, quartzite etc.; the distribution of the particle sizes is in shapes of wide peak and sharp peak; the source area was the eroded area of the metamorphic rocks of Calymmian Aksu Group; the supply of the provenance came from the main river and the branching river. The study of alluvial fans, ancient flows and the prove-nance has determined the range of the orebody, the best orientation of the exploration line and the potential prospecting targets, thus providing guidance for further exploration.