内蒙古正蓝旗桃山萤石矿床地质特征及找矿方向浅析

Geological characteristics and prospecting direction ofthe Taoshan fluorite deposit in Zhenglan Banner,Inner Mongolia

桃山萤石矿床位于冀北—辽西萤石矿成矿带,该区域既位于华北克拉通与兴蒙造山带构造转换区域,又是大兴安岭火山岩带与冀北—辽西火山岩带转换的区域,良好区域位置为萤石矿的形成提供了有利条件。为了满足矿山持续生产需求,通过矿山地质测量、槽探、钻探、物探等地质调查工程手段,共查明3条萤石工业矿体,均赋存于上侏罗统满克头鄂博组地层中;矿体受断裂构造控制,走向NE,倾向NW,倾角55°;矿体形态复杂,以脉状为主,其次为囊状、透镜状;工程控制矿体长度60~200 m,最大控制斜深50~117 m,矿体真厚度0.64~5.73 m。高密度电阻率法测量显示矿体围岩表现为中低阻特征,矿体具中高阻特征。通过对矿床地质背景、矿床地质特征、矿床成因、找矿标志及方向进行研究探讨,为矿山生产、深部及外围进一步探矿工作提供依据。

The Taoshan fluorite deposit is located in the fluorite metallogenic belt from northern Hebei to western Liaoning.This area is not only located in the tectonic transformation area between North China Craton and Xingmeng orogenic belt,but also the transformation area between Greater Khingan Range volcanic rock belt and northern Hebei western Liaoning volcanic rock belt.The good regional location provides favorable conditions for the formation of fluorite deposit.In order to meet the demand of continuous production of the mine,three fluorite industrial ore bodies have been found through geological survey engineering means such as mine geological survey,trenching,drilling and geophysical exploration,all of which occur in the strata of Manketou’ebo Formation of Upper Jurassic system;The ore body is controlled by fault structure,with NE trend,NW dip and 55°;The shape of the ore body is complex,mainly vein,followed by capsule and lens;The length of the ore body controlled by the project is 60~200 m,the maximum controlled inclined depth is 50~117 m,and the true thickness of the ore body is 0.64~5.73 m.The high-density resistivity measurement shows that the surrounding rock of the ore body is characterized by medium low resistivity,and the ore body is characterized by medium high resistivity.Through the research and Discussion on the geological background,geological characteristics,genesis,prospecting signs and direction of the mining area,it provides a basis for mine production,deep and peripheral further exploration.