河南铁山河铁矿地质特征及矿床成因探讨

Discussion of geological characteristics and deposit genesis of Tieshanhe iron deposit in Henan Province

河南铁山河铁矿是1958年发现的一个本矿区品位最高的铁矿床,矿区内全铁品位最高69.05%,最低20.6%,平均42.28%,但矿床成因至今仍有很多分歧。通过对前人成果的总结和矿区实地调研后发现:矿床主要赋存于古元古界银鱼沟群白岩山组,与地层同步褶皱,具有明显的沉积变质作用成矿特征,同时矿床受后期斜长角闪岩侵入体的叠加改造,认为铁山河铁矿应为沉积变质+叠加改造成因。这一认识为铁山铁矿及外围勘查找矿,特别是为找富矿体指明方向。

Tieshanhe iron deposit is discovered in Henan Province in 1958,which is an iron deposit of the highest grade in the mining area.The Fe grade ranges from 69.05%to 20.6%,with an average of 42.28%.So far the genesis of this deposit is still under debate.On the basis of the summary of the previous study results and the field survey in the mining area,it is discovered that Tieshanhe deposit is mainly hosted in Proterozoic Baiyanshan Formation of Yinyugou Group,and the ore bodies are isochronous folding with the strata.With obvious sedimentary-metamorphic mineralization characteristics,the deposit is also suffered the superimposition and reformation of the late plagioclase amphibolitie.Therefore,it is considered that Tieshanhe deposit is the sedimentary-metamorphic and late superimposition-reformation genesis.This understanding of the genesis of Tieshanhe iron deposit has pointed out the prospecting direction of how to find out the rich orebody in the mining area and its periphery.