吉林省敦化市塔东铁矿床成因研究  

Genesis of Tadong Fe deposit in Dunhua city,Jilin province

作　　者：武晗[1] 

机构地区：[1]首钢地质勘查院地质研究所,北京100144

出　　处：《地质找矿论丛》2016年第2期220-227,共8页Contributions to Geology and Mineral Resources Research

摘　　要：塔东铁矿床与典型的沉积变质矿床相比,其具有特殊性。赋矿地层及矿体中黄铁矿分布广泛且含量高;不同矿体矿石品位表现出明显的差异。黄铁矿的电子探针分析反映有弱的S亏损,说明有热液成因的特点;S亏损程度低代表与岩浆作用有关的热液作用。黄铁矿Re-Os同位素年代反映塔东铁矿热液成矿作用发生于401 Ma±41 Ma,其与矿区西部黑云母斜长花岗岩年龄(407 Ma±28 Ma)极为相近;且塔东铁矿石品位w(mFe)值也因距离西部黑云斜长花岗岩的远近程度不同而表现出"东低西高、浅低深高"的特点。作者据此并结合前人研究成果将塔东铁矿床的成因总结为"海底火山喷发—区域变质—岩浆热液叠加富集成矿"。Compared to the typical sedimentary metamorphic iron deposit Tadong Fe deposit is special in respect of wide spread pyrite and high percent of the mineral in both the host strata and ore bodies,evident grade variation of each ore body and weak S depletion reflected by the electronic probe analysis.S depletion is chracter4 istic of hydrothermal activity.Weak S depletion is related to magmatic hydrothermal activity.The Re-Os dating of pyrite from the deposit shows that hydrothermal activity took place at401 Ma±41 Ma,very close to the age（407 Ma±28 Ma）of biotite-plagioclase granite in the west of the deposit.w（mFe）value of grade of the iron ore is varied with distance variation to the biotite-plagioclase granite,generally lower in east part and higher un the west part of the deposit and lower at shallower part and higher to deeper part of the deposit.Based on the grade distribution and previous researches the author sums up the ore-forming process：sea floor volcanic eruption-regional metamorphism-magmatic hydrothermal overprinting enrichment to ore for the deposit.

关 键 词：塔东铁矿 黄铁矿化 黑云斜长花岗岩 热液叠加 吉林省 

分 类 号：P611[天文地球—矿床学] P618.31[天文地球—地质学]