越西县拉尔铁矿地质特征及控矿因素

Geological Characteristics and Ore-controlling Factors of Laer Iron Deposit in Yuexi County

越西县拉尔铁矿采矿权范围内的铁矿资源经过多年开采,拥有的铁矿资源量已不多,需要加大勘查投入寻找接替资源。通过对拉尔铁矿的成矿地质背景、矿床地质特征及控矿因素进行综合分析,结果表明:①该矿床与本地区铁矿床具有相同的成矿地质背景,铁矿体赋存于中泥盆统箐门组砂岩夹页岩的碎屑岩中,呈顺层状产出;②该矿具有层控矿床特征,受切罗木向斜控制;③越西地区古地理环境有利于铁矿床的形成,属于“宁乡式”沉积型铁矿床;④矿床成因属于浅海相的沉积型胶体化学成矿。研究结果对于区域同一层位、邻区找矿勘查有一定的参考价值。

After years of exploitation,the amount of iron ore resources in the mining right of Laer Iron Mine in Yuexi County is small,so it is necessary to increase exploration investment to find replacement resources.Through comprehensive analysis of metallogenic geological background,geological characteristics and ore-controlling factors of Laer Iron Mine,the results show that:①The deposit has the same metallogenic geological background as the iron ore deposit in this area.The iron ore body occurs in the clastic rock of sandstone and shale of Qingmen Formation of Middle Devonian,and is produced in bedding.②The deposit is stratified and controlled by cheromu syncline.③The palaeogeographic environment in the west of Yuexi is favorable to the formation of iron deposits,which belong to Ningxiang-type sedimentary iron deposits.④The genesis of the deposit belongs to the sedimentary colloid chemical mineralization of shallow Marine facies.The research results have certain reference value for the prospecting of the same horizon and adjacent area in the region.