秦岭金属矿床成矿系列与大陆造山带构造动力学背景

根据构造单元、构造演化及其矿床组合,将秦岭造山带划分为4个成矿集中区:小秦岭古陆活化区、熊耳山裂谷增生区、南秦岭被动陆缘断陷区和碧口地体古拼合带。分别构成4个成矿系列:花岗-绿岩带型金-铁矿床系列、陆相火山岩型金-钼矿床系列、沉积岩型金-铅锌-汞锑矿床系列、海相火山岩型金-银-多金属矿床系列与超基性岩型镍-金矿床系列。矿床系列表现出同生成矿作用和后生叠加改造成矿作用的演化,同生成矿作用与造山带形成早期(古生代及其以前)广泛的地幔羽或热点活动有关,后生成矿作用是在盆山转化和陆内构造-岩浆活动时期(120～340Ma)完成的。

Minerogenetic series of metallic ore deposits in the Qinling Mountains and tectonodynamic background of the continental orogenic belts

On the basis of the tectonic units,tectonic evolution and deposit association,the Qinling oro-genic belt is divided into four mineralization concentration areas:the Xiao Qinling craton activation area,Xiong'ershan rift accretion area,South Qinling passive continental-margin down-faulted area and Bikou terrane paleo-assemblage zone,which separately form four minerogenetic series:the granite-greenstone belt-type gold-iron minerogenetic series,continental volcanic-hosted gold-molybdenum minerogenetic se-ries,sedimentary-hosted gold-lead-zinc-mercury-antimony minerogenetic series and marine volcanic-host-ed gold-silver polymetallic and ultrabasic-hosted nickel-gold minerogenetic series.Syngenetic mineralization is related to extensive mantle or hot spot activities in the early stage(Paleozoic and its preceding stage)of format of the orogenic belt;post-genetic mineralization was accomplished during the basin-range transfor-mation and intracontinental tectono-magmatic activities(at120-340Ma ).