豫西龙门店银矿成矿规律及深部预测

Metallogenic Regularities and Deep Prospecting of the Longmendian Silver Deposit in Western Henan Province

为探讨豫西龙门店银矿的成矿规律和深部成矿潜力,在分析矿区成矿地质背景和矿床地质特征的基础上,开展了野外地质调查以及包裹体测温。结果发现,龙门店银矿具有断裂构造控矿、矿体等距分布、矿体侧伏明显及围岩蚀变分带等成矿特征,对区内找矿有重要的指示作用。其中的K6矿体化探数据表明,该矿体自上而下的原生晕轴向分带序列为W-Cu-AsHg-Mo-Au-Bi-Zn-Ag-Pb-Sb,出现了明显的＂前尾晕共存＂及＂反向分带＂现象;结合微量元素地球化学参数垂向变化规律,预测K6矿体深部存在规模较大的盲矿体,在848m标高以下有较大的找矿潜力,设计验证钻孔ZK6-01,预测见矿深度620~640m。

In order to discuss the metallogenic regularity and deep prospecting potential of the Longmendian silver deposit in western Henan Province, on the basis of analyzing metallogenie geological background and ore geological features of the deposit, field geological survey, microthermometric survey of fluid inclusions, and geochemical survey of the deposit have been carried out in this paper. Results show that several metallogenic characteristics, including fracture-controlling, iso- metric distribution, and obvious side raking of orebodies, and wallrock alteration zoning, have been observed in the Long- meridian silver deposit. They are very important indicative factors for the mineral exploration in the Longmendian area. Re- suits of geochemical survey in the K6 orebody show that the primary halo zoning sequence of the indicator elements in axial direction from up to bottom of the K6 orebody is W-Cu-As-Hg-Mo-Au-Bi-Zn-Ag-Pb-Sb. This appears that there are obvious phenomenon of the co-existence of frontal halo and tail halo, and the reverse axial zoning. Combining with the variation regularities of geochemical parameters of trace elements in axial direction it is considered that there could be a quite large blind orebody in depth below the K6 orebody, especially, below the 848 m level. A drilling hole ZK6-01 has been de- signed to testify the predictive orebody at 620 ~ 640 m level.