The demand for fluorite resource is increasing rapidly as most fluorite deposits on Earth’s surface have been exhausted.The newly discovered fluorite deposits in Inner Mongolia are hosted by Permian metamorphosed san...The demand for fluorite resource is increasing rapidly as most fluorite deposits on Earth’s surface have been exhausted.The newly discovered fluorite deposits in Inner Mongolia are hosted by Permian metamorphosed sandy slate,intermediate-acid intrusive rocks and Cretaceous volcanic sedimentary rocks.The ore bodies are strictly controlled by faults and buried by cover rocks.The feasibility and effectiveness of multi-techniques for prospecting concealed fluorite ore bodies are evaluated,and 10 anomalies are delineated.On the basis of geological features and effectiveness of different methods,the optimum combinations of ore prospecting techniques are proposed for the exploration of zonal type and burial type concealed fluorite ore bodies.Based on comprehensive researches,an integrated exploration model is proposed:(i)select key prospecting targets based on geological backgrounds,regional geochemical anomalies of F and Ca,and remote sensing images;(ii)identify the spatial distribution of low resistivity anomaly and ore-controlling structure from geophysical survey;(iii)evaluate the mineralization potential in fault zone based on F and Ca anomalies in key sections selected from low resistivity anomaly zones;and(iv)evaluate the mineralization potential and reveal the spatial distribution of fluorite ore bodies and ore-controlling faults based on integrated geophysical and geochemical anomalies.The integrated exploration model is verified to be a powerful tool for prospecting concealed fluorite ore bodies in coverage area.展开更多
内蒙古林西县萤石矿产资源丰富,已知萤石矿床（点）68处。萤石矿床产出于中生界火山-沉积岩地层中,矿体主要受近 SN 向或 NNE 向断裂破碎带控制。为了研究水头地区萤石矿床的成矿流体来源和成矿机理,文章对矿床稀土元素进行了分析。结...内蒙古林西县萤石矿产资源丰富,已知萤石矿床（点）68处。萤石矿床产出于中生界火山-沉积岩地层中,矿体主要受近 SN 向或 NNE 向断裂破碎带控制。为了研究水头地区萤石矿床的成矿流体来源和成矿机理,文章对矿床稀土元素进行了分析。结果表明萤石和方解石的稀土元素总量（∑REE）为4.37-159μg/g, LREE/HREE比值为0.24-1.80,δEu =0.57-1.60,具弱Ce负异常（0.81-0.98）特征, Y/Ho比值为21-78,平均41。从成矿早阶段到晚阶段,∑REE值及LREE/HREE比值均逐渐减小,晚阶段萤石具有重新活化、重结晶的特征。结合赋矿地层及矿区外围花岗岩体REE特征分析,认为其成矿流体迁移距离较远,稀土元素和成矿元素可能来自下伏高F地体和含Ca赋矿火山-沉积地层,为热液成因-破碎带充填交代型萤石矿床。展开更多
基金supported by the Fundamental Research Funds for the Central Universities(No.2652019191)China Geological Survey(No.1212011120187)the National Natural Science Foundation of China(No.41502347)。
文摘The demand for fluorite resource is increasing rapidly as most fluorite deposits on Earth’s surface have been exhausted.The newly discovered fluorite deposits in Inner Mongolia are hosted by Permian metamorphosed sandy slate,intermediate-acid intrusive rocks and Cretaceous volcanic sedimentary rocks.The ore bodies are strictly controlled by faults and buried by cover rocks.The feasibility and effectiveness of multi-techniques for prospecting concealed fluorite ore bodies are evaluated,and 10 anomalies are delineated.On the basis of geological features and effectiveness of different methods,the optimum combinations of ore prospecting techniques are proposed for the exploration of zonal type and burial type concealed fluorite ore bodies.Based on comprehensive researches,an integrated exploration model is proposed:(i)select key prospecting targets based on geological backgrounds,regional geochemical anomalies of F and Ca,and remote sensing images;(ii)identify the spatial distribution of low resistivity anomaly and ore-controlling structure from geophysical survey;(iii)evaluate the mineralization potential in fault zone based on F and Ca anomalies in key sections selected from low resistivity anomaly zones;and(iv)evaluate the mineralization potential and reveal the spatial distribution of fluorite ore bodies and ore-controlling faults based on integrated geophysical and geochemical anomalies.The integrated exploration model is verified to be a powerful tool for prospecting concealed fluorite ore bodies in coverage area.
文摘内蒙古林西县萤石矿产资源丰富,已知萤石矿床（点）68处。萤石矿床产出于中生界火山-沉积岩地层中,矿体主要受近 SN 向或 NNE 向断裂破碎带控制。为了研究水头地区萤石矿床的成矿流体来源和成矿机理,文章对矿床稀土元素进行了分析。结果表明萤石和方解石的稀土元素总量（∑REE）为4.37-159μg/g, LREE/HREE比值为0.24-1.80,δEu =0.57-1.60,具弱Ce负异常（0.81-0.98）特征, Y/Ho比值为21-78,平均41。从成矿早阶段到晚阶段,∑REE值及LREE/HREE比值均逐渐减小,晚阶段萤石具有重新活化、重结晶的特征。结合赋矿地层及矿区外围花岗岩体REE特征分析,认为其成矿流体迁移距离较远,稀土元素和成矿元素可能来自下伏高F地体和含Ca赋矿火山-沉积地层,为热液成因-破碎带充填交代型萤石矿床。
