浙江临安学川萤石矿区地质特征与成矿条件分析

Analysis on geological characteristics and metallogenic condition of Xuechuan fluorite deposit in Linan, Zhejiang

学川萤石矿床为中型规模萤石矿床,位于浙江临安西部,学川-武村背斜的北西翼。矿区共有5条矿体,受断裂控制基本呈北西、北西西或近东西向脉状产出,以萤石-石英型和条带状矿石为主,品位较高,属燕山晚期中低温热液裂隙充填型矿床。在综合分析区域地质、矿体特征等的基础上,对学川萤石矿的成矿条件、矿床成因进行了探讨,提出花岗岩体内外接触带、花岗岩岩株顶面凸起与成矿前北东向断裂汇合部位、近矿围岩蚀变、硅化带、开采巷道两端和深部五个找矿方向,为进一步的找矿工作奠定了基础。

The Xuechuan fluorite deposit is medium-sized.located in the west of Lin’an,Zhejiang Province,on the northwest wing of the Xuechuan-Wucun anticline.There are five orebodies in the mining area,which are mainly High-grade fluorite-quartz and stripe-like ores.The mineral veins are generally NW,NWW or nearly EW-trending,which are Controlled by faults.They belong to the Yanshanian medium-low temperature hydrothermal fissure filling deposit.Based on the analysis of areal geology and ore body characteristics,we preliminary analyzed the minerogenetic condition and the genesis of fluorite deposit.Finally,we propose five prospecting directions,i.e.,the contact zone inside and outside the granite body,the converging position of the top surface of the granite stock and the NE-trending faults before mineralization,the alteration of the surrounding rock near the ore body,the silicification zone,the two ends of the tunnel and the deep part,which lays a foundation for further prospecting work.