重庆南武矿区煤中镓赋存规律及控制因素

Occurrence regularity and controlling factors of gallium in coal of Nanwu mining area, Chongqing

上二叠统龙潭组是重庆南武矿区的主要含煤岩系,通过采集主采煤层C_(25)样品,运用ICP-MS(稀土元素)、电子显微镜,X射线衍射等方法对重庆南武矿区龙潭组煤的元素地球化学特征进行研究。研究发现,南武矿区晚二叠世龙潭组C_(25)煤中Ga元素富集,平面上呈现东北高、西北低的分布规律,矿区东北部天宝煤矿和开发煤矿达到综合利用品位。统计分析表明,C_(25)煤中Ga主要以无机态赋存于黏土矿物或硅酸铝盐矿物中。初步分析认为,南武矿区上二叠统龙潭组煤中Ga元素的富集主要受物源、沉积环境及构造热演化的控制。

The Upper Permian Longtan Formation is the main coal-bearing rock series in Nanwu mining area of Chongqing. Based on the survey and sampling, ICP-MS（rare earth element）, electron microscope and X-ray diffraction, the elemental geochemical characteristics were studied. It is found that the element Ga in seam C_（25） of Late Permian Longtan Formation in Nanwu mining area is enriched, showing the variation pattern of being high in the northeast and low in the northwest in the plane. In Tianbao coal mine in the northeast of the mining area, the coal mine has reached comprehensive utilization grade, the value of comprehensive utilization of metallic elements deserves attention. SPSS statistical analysis showed that Ga in C_（25） exists mainly in the inorganic state in clay minerals or aluminum silicate minerals. The preliminary analysis shows that the Ga accumulation in the Late Permian Longtan Formation in Nanwu mining area is controlled mainly by provenance, sedimentary environment and tectonic thermal evolution.