栾川县大清沟铁铜矿床地质特征及成矿模式探讨

Discussion on geological characteristics and metallogenic model of Daqinggou Fe-Cu deposit in Luanchuan County

大清沟铁铜矿位于华北地台南缘,基底为太古界太华群变质岩系,盖层为中元古界熊耳群安山岩、官道口群碳酸盐岩,区内北西西向构造发育,岩浆活动比较频繁;矿体多呈脉状、似层状、透镜状分布,矿体严格受北西西向断裂或片理化带的控制。初步建立矿床的成矿模式:原生沉积的铁质形成了太华群片麻岩含铁建造基底,局部富集成矿形成原生沉积变质铁矿床;古远古晚期岩浆热液交代,在片理化带内富集形成含铁建造—热液改造型铁矿床;中生代花岗质岩浆沿断裂上侵进入火山岩盖层形成火山沉积含铁建造—热液改造型铁矿,在绢云石英片岩带附近形成闪长岩脉的同时形成热液脉状铜矿床。

Daqinggou Fe-Cu deposit is located in the southern margin of North China,the base Archean Taihua Group metamorphic rocks,cap rock is Mesoproterozoic Xiong’er Group andesite,Guandaokou group of carbonate rocks,the area NWW tectonic development,Magmatic activities are relatively frequent;the ore bodies are mostly vein-like,layer-like,and lenticular,and the ore bodies are strictly controlled by the NW-west fault or the physicochemical zone.The ore-forming model of the deposit was preliminarily established in this paper:the primary sedimentary iron formed the iron-bearing basement of the Taihua Group gneiss,and the localized rich ore formed the primary sedimentary metamorphic iron deposit.The ancient Paleozoic magmatic hydrothermal metasomatism,in the physicochemical zone Internal enrichment,formed an iron-bearing-hydrothermal-reformed iron deposit;Mesozoic granitic magma invaded into a volcanic rock caprock along the fault to form a volcanic deposit iron-bearinghydrothermal reformed iron ore,near the ziyun quartz schist zone.The formation of a diorite vein formed a hydrothermal vein copper deposit.