南秦岭月坪沟钼矿床地质特征及成矿规律

Geological Characteristics and Metallogenic Regularity of Yuepinggou Molybdenum Deposit in Southern Qinling Orogen

月坪沟钼矿位于秦岭造山带中南部,胭脂坝—四海坪岩体外接触带,镇旬盆地西缘一带,属南秦岭江口—旬阳坝—杨泗钼钨矿集区。矿床类型为热液脉型,矿体产出严格受控于NNE—NE向节理、裂隙系统,赋矿岩性主要为石英脉。通过对月坪沟钼矿成矿地质背景、矿床特征、矿床成因模式进行分析总结,结合邻区桂林沟钼矿、月河坪钼矿等典型矿床,总结出区域钼矿成矿时间主要为燕山期,空间上具有分布于岩体内、外接触带,以及"上脉下体"的矿化分布特征,以及"三层楼"成矿规律。在上述分析的基础上,对月坪沟一带钼矿找矿前景进行了分析,并提出了找矿建议。

Yuepinggou Molybdenum Deposit in Southern Qinling Orogen is located in the contact zone between Yanzhiba and Sihaiping granite,and in the west margin of Zhenxun Basin.The mining area belongs to the part of Jiangkou-Xunyangba-Yangsi molybdenum tungsten ore collection area.The genesis type of deposit is hydrothermal vein type,the output of orebodies is strictly controlled by NNE-NE joint and fissure structure.The ore hosting lithology is quartz vein.Through the analysis and study of the metallogenic geological environment and deposit characteristics,genetic model of the deposit is summarized.By comparison of the characteristics of Guilingou Molybdenum Ddeposit and Yueheping Molybdenum Deposit in the adjacent of Yuepinggou Molybdenum Deposit,it is concluded that the metallogenic time of molybdenum deposit in the mining area is mainly in Yanshanian,the mineralization is distributed in the inner and outer contact zoens of granite,and the spatial distribution of mineralization can be characterized by "the upper part is a vein body and the lower part is orebody", and the metallogenic regularity of "three levels" is presented.Based on the above discussion results,the prospecting prospective of molybdenum deposit in Yuepinggou area is analyzed,and some related prospecting suggestions are given.