沈阳南部蟒公屯一带铁矿成矿地质特征及成因分析

Metallogenic Geological Characteristics and Genetic Analysis of Iron Ore Deposits in the Area of Manggongtun South of Shenyang

本文为研究沈阳南部蟒公屯一带铁矿成矿的地质特征,对蟒公屯铁矿所处的区域地质背景,矿区、矿体地质特征等进行论述,分析总结矿体的成矿条件,探究岩浆活动、构造运动及围岩蚀变与铁矿体成因之间的关系。结果表明:区内出露的太古代鞍山群大峪沟组为铁矿体的主要赋矿层位,铁矿层呈扁豆状赋存于角闪斜长变粒岩段中;断裂构造多具控矿作用,为成矿提供元素的运移通道;围岩总体上具有黄铁矿化、硅化、碳酸盐岩化,对找矿具有指示作用。矿体较大而贫,物质组分简单,为铁硅质沉积建造受区域变质的矿床,矿床成因属“鞍山式”铁矿床。

In order to study the geological characteristics of iron ore mineralization in the Manggongtun area in the south of Shenyang,the regional geological background,geological characteristics of mining area and ore body of Manggongtun Iron Mine were discussed,the ore-forming conditions of the ore body were analyzed and summarized,and the relationship between magmatic activity,tectonic movement and wall rock alteration and the genesis of the iron body was explored.The results show that The dayugou formation of Anshan group is the main host bed of the iron ore body,and the iron ore layer occurs in the hornblende granulite section in the shape of lentil.The faulted structure has many ore-controlling functions and provides the migration channel of elements for mineralization.The surrounding rock has pyritization,silicification and carbonate lithification on the whole,which is indicative for ore prospecting.The ore body is large and poor,and the material composition is simple.It is an iron-silicic deposit that is subject to regional metamorphism.The genesis of the deposit belongs to anshan type iron deposit.