李玉华　杨伟红

摘 要：莱州莲花山地区位于胶北突起的西南部，地层仅零星出露新太古代胶东岩群，区内岩浆岩广泛发育，主要为中生代晚侏罗世燕山早期玲珑序列。区内断裂构造较发育，分布有东西向、北东向和北西向三组断裂，其中东西向断裂具有多期活动特点，是区内导矿和储矿构造。区内发育三条萤石矿脉，赋存在断裂带硅化角砾岩内或硅化角砾岩顶板二长花岗岩中，呈裂隙密集脉状、网脉状沿东西向断裂带展布。该矿床的成因类型应属浅成中低温、热液裂隙充填脉型萤石矿床。

关键词：萤石；地质特征；找矿方向；莲花山

中图分类号：P619.215 文献标志码：A 文章编号：2095-2945（2018）32-0062-02

Abstract： The Lianhuashan area in Laizhou is located in the southwest of Jiaobei protuberance. The strata only show the NeoArchean Jiaodong rock group sporadically. The magmatic rocks are widely developed in the area， mainly belong to the early Yanshanian linglong sequence of late Jurassic in the Mesozoic Era. There are three groups of faults in this area， which are EW， NE and NW. Among them， the EW faults have the characteristics of multiple periods of activity and are the ore conducting and storage structures in the region. There are three fluorite ore veins in the area， which occur in the silicified breccia of the fault zone or in the monzonitic granite of the silicified breccia roof， and are distributed along the east-west fault zone in the form of fissure-dense veins and net-veins. The genetic type of the deposit should be epithermal meso-low temperature， hydrothermal fissure filling vein type of fluorite deposit.

Keywords： fluorite； geological characteristics； prospecting direction； Lianhuashan

萤石是唯一能形成工业矿产的氟化物，广泛用于钢铁、氟化工、炼铝、建材工业、精密光学仪器、医药、农业等行业。随着工业和科学技术的发展，其需求量不断增加。山东较大的萤石矿床均分布在沂沐断裂带东侧白垩纪火山-沉积岩系附近的燕山期花岗质侵入岩及早前寒武纪变质岩系中，主要有3个萤石矿集中区[1]。该区即位于其中的胶北隆起西南部莱州东-平度西一带的新元古代二长花岗岩和古元古代荆山群变质岩分布区。胶北隆起的基底变质岩系受到晚中生代构造热事件的影响[2]，构造活动强烈，岩浆活动比较频繁，该区萤石矿也多与此有关，其中招远青龙萤石矿[3]与本区为同一构造带控制。

1 区域地质背景

该区大地构造位置位于华北板块、胶辽隆起区、胶北隆起、胶北断隆、胶北凸起。……