摘要
白乃庙铜金矿田经历了复杂的多期次成矿作用,通过对白乃庙铜(钼金)矿床南北矿带及赋存在不同构造中的金矿床(点)的详细观察分析和对比研究,阐述了铜矿的形成经历了早期变质热液-岩浆热液-晚期变质热液等的多期成矿作用叠加,南北矿带叠加强度不一致,铸成了两矿带地质特征上的差异;不同构造中的金矿脉是不同期成矿作用的产物。赋存于白乃庙主干及其派生断裂或裂隙中的石英脉是燕山期大气降水热液作用所致,而韧性剪切带、片理化带及其附近构造中的石英脉则是海西期末的变质热液(其中混有一定量的岩浆水)矿化作用的结果。
With the movement of tectonics, Bainaimiao copper-gold ore field underwent complex multiphase metallization the whole geological history. In this paper, has been studied and analysed in detail by comparing the geological characteristics of north with those of south ore zones of copper (molybdenum and gold) deposit and gold bodies which exist in the different tectonics, such as typomorphism of prite, alteration of county rock and so on. It's concluded from these reseraches that main elements for mineralization (Cu, Mo, Au) orig- inated from the county rock-Bainaimiao group with some Cu and Mo from the granediorite porphyry (386Ma K-Ar). As a whole, the copper deposit was the result of superimposition of multiphase metallization which could be described as early metamorphic hydrothermal-magmatic hydrothermal-remetamorphic hydrothermal, but there were many differdnts between the two zones. Haixi and Yanshan periods are important time for mineralization of gold. In Haixi period, a lot of prospects in uncomformity, shear zones and some EW or SN trending structural fractures were formed by filling of mixed hydrothermal of postmagmatic and metamorphic water. And in Yanshan period, it's mesozoic hydrothermal that filled Bainaimiao fault fracture zone, passing the source-bed and getting enomous quatities of Au-from there, in order to form Au-pbearing quartz veins.
