内蒙古乌兰浩特地区萤石矿床成矿预测

内蒙古乌兰浩特地区拥有丰富的萤石矿资源,虽然地方上矿产开发力度大,但成矿研究相对较少,为此,开展该地区的成矿预测研究。本研究运用流体包裹体测量方法结合矿床地质特征探讨成矿模式,并采用伽马能谱测量技术对乌兰浩特地区的萤石矿床进行成矿预测,进而分析找矿靶区。结果表明,该区域属于浅层中—低温热液裂隙充填成矿,成矿流体的均一温度在170℃~195℃之间,平均值为186℃;盐度w(NaCleq)范围为0.35%~5.41%;平均密度为0.94 g/cm 3,平均压力为16.45 bar;萤石矿体较其他地质体的放射性元素相比含量最低,其U、Th、K元素的质量分数范围分别为1.76×10-6~6.35×10-6、18.2×10-6~25.7×10-6、0.37%~2.45%,运用伽马能谱测量找矿具有可行性,并根据Th含量测量结果,圈出A类和B类成矿远景区各一个。研究成果对今后的找矿具有一定的指导价值和实践意义。

Metallogenic prediction of fluorite deposits in Ulanhot area,Inner Mongolia

Ulanhot area of Inner Mongolia is rich in fluorite mineral resources.Although the local mineral development is strong,the metallogenic research is relatively less.In this study,combined with the geological characteristics of the deposit,fluid inclusion measurement method is used to discuss the metallogenic model.The gamma energy spectrum measurement technology is used to carry out metallogenic prediction of the fluorite deposit in Ulanhot area,and then the prospecting target area is analyzed.The result shows that the area belongs to shallow middle-low temperature hydrothermal fracture filling mineralization.The homogenization temperature of ore-forming fluid is between 170℃and 195℃with an average of 186℃.The salinity w(NaCleq)range is 0.35%-5.41%.The average density is 0.94 g/cm 3,and the average pressure is 16.45 bar.Compared with other geological bodies,fluorite ore body has the lowest radioactive element contents,and its U,Th and K contents are 1.76×10-6-6.35×10-6,18.2×10-6-25.7×10-6,0.37%-2.45%respectively.It is feasible to use gamma energy spectrum measurement in the ore prospecting.According to the measurement result of Th content,A and B metallogenic prospective areas are delineated.The research result has the certain guiding value and practical significance for the future prospecting.