闽西北铅锌矿成矿特征及控矿条件浅析

METALLOGENIC FEATURES AND ITS ORE-CONTROLING CONDITIONS ON LEAD-ZNIC IN NORTHWEST FUJIAN

闽北地区属华南褶皱系的一部分,其中铅、锌为区内优势矿种,广泛分布于前震旦纪变质岩系中,尤其以前震旦纪龙北溪组的黑云斜长变粒岩、云母片岩、石英片岩中最为多见。其成矿特征可分为热液型铅锌矿床、充填交代型铅锌矿床及沉积变质热液叠加型铅锌矿床。其形成受地层、岩浆、构造(以断裂构造为主)控制较为明显,前震旦系变质岩系中的绿片岩、压扭性断裂及前震旦系变质岩系与岩体的接触带及其附近应是本区铅锌矿床找矿的主要方向。

North Fujian is part of south China fold system, as the predominant minearls, lead and znic widely distributing in metamorphic rock series of early sinina period, especially exists in rocks of mica-plagioclase leptynite, mica schist and quartz-schist, structure （ fracture ）, The lead-znic deposit can be divided into metamorphic hydrothermal Pb-Zn deposots, filling metasomatic type Pb-Zn deposits and sedimentary-metamorphic hydrothermal superimposited Pb-Zn deposots according on its metallogenic feature. Its ore-forming controlled by the stratum, magma, the green schist of metamorphic rock series in early Sinain Period, compressional tortion fracture, contact zone of rock body and rock series in early Sinain Period＇are the main directions for looking for lead-znic deposits in this area.