塔里木盆地西缘乌恰地区海相砂岩型铜矿的发现及对找矿的指示意义

Discovery and prospecting significance of marine sedimentary sandstone-type copper deposits in Wuqia County, western margin of Tarim Basin

塔里木盆地西缘乌恰地区玛依喀克海相砂岩型铜矿位于克孜勒苏河以南,大地构造位置属于帕米尔逆冲推覆构造带。本次在古近系海相沉积地层中发现3套稳定含矿层位,矿体主要受层位控制,走向上延伸约10~15 km,呈层状、透镜状,真厚度0.38~1.1 m,品位0.4%~4.12%。结合矿床形成的古地理环境、含矿砂岩的地球化学特征等,初步总结了玛依喀克铜矿以原始沉积作用形成稳定含矿层,后期构造及盆地流体的叠加形成矿床的成矿模式。塔里木盆地西缘喀什坳陷盆地海相砂岩铜矿的发现既完善了该区域砂砾岩型矿床成矿系统,也提出了新的找矿方向。

Mayikak marine sandstone-type copper deposit in Wuqia County, west margin of Tarim basin which located at south of Kezilesu River. Geotectonic location belongs to Pamir thrust nappe tectonic zone. Three sets of stable ore-bearing horizons were found in the Paleogene marine sedimentary strata this time, and its orebody is mainly controlled by horizons. The ore body extends approximately 10-15 km upwards, is layered and lenticular, with a true thickness of 0.38 to 1.1 meters and a grade of 0.4% to 4.12%. Based on the paleo-geographical environment and geochemical characteristics of ore-bearing sandstones, the ore-forming model of the Mayak Copper Mine that formed a stable ore-bearing layer through primary sedimentation, and the superposition of late structure and basin fluids, was initially summarized. The discovery of marine sandstone copper deposits in the Kash depression basin on the western margin of Tarim has not only perfected the ore-forming system of glutenite-type deposits in the area, but also proposed new prospecting directions.