河南灵宝银家沟硫铁多金属矿床地质特征及成矿模式

豫西银家沟硫铁多金属矿床是与中酸性斑岩小侵入体具成因联系的大型热液交代型矿床;矿床赋矿地层主要为蓟县系龙家园组和巡检司组含燧石条带白云岩;矿床的成矿岩体呈复式微型岩株,中心相为钾长花岗斑岩,边缘相为石英闪长斑岩,岩体为超浅成侵入伴随隐爆作用的次火山相岩浆岩;矿床以硫铁矿为主体,共/伴生有铁、铜、钼、铅、锌、银、金等;矿体以透镜状为主,均为隐伏矿体;成矿分为磁铁矿-赤铁矿阶段、石英-辉钼矿阶段、石英-中粗粒黄铁矿阶段、黄铜矿-磁黄铁矿阶段;铅锌硫化物为最晚期产物。银家沟硫铁多金属矿床具有成矿物质多来源、成矿多阶段的特点。成矿岩体自身携带大量成矿元素,同时萃取了围岩中的多种成矿元素,在环境适合的条件下沉淀成矿。

Geological features and prospecting model of Yinjiagou pyrite polymetallic deposit in Lingbao county, Henan province

Yinjiagou pyrite polymetallic deposit is a large hydrothermal metasomatic deposit closely related to small intermediate-acidic porphyry intrusions and occurs in chert-banded dolomite of Longjiayuan Fm and Xunjiansi Fm of Mesoproterozoic Jixian system in west Henan province.The small intermediate-acidic porphyry intrusions are super shallow intrusive bodies accompanied by crypto-blasted sub-volcnics occurring as micro-complex stocks in which is centered K-feldspar granite rimmed with quartz dioritic porphyry.The deposit is dominated by pyrite with by-product of Fe,Cu,Mo,Pb,Zn,Ag and Au.Ore bodies are all blind,mainly in lenses.Mineralization includes stages of （1） magnetite-hematite; （2） quartz-molybdenite; （3） quartz-medium-coarse grained pyrite; （4） chalcopyrite-pyrrhotite.Pb,Zn sulfides are the latest product.The deposit is characteristic of multiple ore material sources and metallogenic stages.The small porphyry intrusions carry large volume of ore elements and extract ore elements from the surrounding rocks.The ore elements are precipitated as ore under proper environment.