少砬哈子碱性岩体铌钽矿化特征及吉中地区碱性岩找矿方向

摘要

More than 20 alkaline igneous complexes have been found in the Dunmi fault zone of the central part of Jilin Province.In this paper,the geological features of Shaolahazi alkaline rock bodies and alteration and mineralization in the southern part of Jiaohe region were studied through detailed geological survey,and found that the rock has a good niobium,cerium mineralization,Nb5O2 average grade of 0.043%,up to？0.049%（no analysis of tantalum）,family of rare-earth content of 0.109% cerium,and different facies alteration with mineralization are quite different,fine-grained structure with relatively good mineralization;by scanning electron microscopy to determine that the ore mineral with niobium tantalum is brown yttrium niobium,it provides the basis for the dressing;combined analysis of the regional geological conditions,it is considered that the alkaline complex in the Dunmi fault zone of central part of Jilin Province is important target for prospecting rare element minerals.%在吉中地区敦密断裂带上,分布大小不等的碱性杂岩体已发现的大约20余个。本文对蛟河南部少砬哈子碱性岩体地质特征及蚀变矿化进行了详细的野外地质调查,发现该岩体具有很好的铌、铈矿化,Nb5O2平均品位0.043%,最高为0.049%（未分析钽）,铈族稀土质量分数0.109%,且不同的岩相带矿化蚀变存在较大差异,细粒结构相矿化相对较好;通过电镜扫描,确定了含铌钽的矿物为褐钇铌矿,为选矿提供了依据;结合区域成矿地质条件分析,认为分布在吉中地区敦密断裂带上的这些碱性杂岩是寻找稀有元素矿产的重要靶区。