内蒙古锡林浩特王根敖包铁矿地质特征及找矿方向

内蒙古自治区锡林浩特王根敖包铁矿产于上石炭统阿木山组上段灰岩与辉长-辉绿杂岩体接触带及其构造裂隙中。文章通过阐述该区成矿地质背景、矿区地质特征(地层、构造、岩浆岩、变质作用、围岩蚀变)、矿床地质特征,分析了区内铁矿主要受岩浆和构造双重因素控制,其矿床具有典型的矽卡岩蚀变分带,矿床成因为矽卡岩型铁矿。对矿床的关键控矿因素、找矿标志进行研究和总结,认为岩体附近的矽卡岩蚀变带、深部分异较好的辉长岩体、北东部M1团状高磁异常区是进一步寻找矽卡岩型铁矿床的有利地段。

Geological characteristics and prospecting direction of Wanggenaobao iron deposit in Inner Mongolia

Wanggenaobao iron deposit is located in the contact zone between limestone and gabbro diabase complex in the upper part of Amushan formation of Upper Carboniferous and its structural fracture. This paper expounds the metallogenic geological background, geological characteristics of the mining area (stratum, structure, magmatic rock, metamorphism, wall rock alteration), and geological characteristics of the deposit, and analyzes that the ore-forming control factors of the iron ore in the area are mainly controlled by the dual factors of magma and structure, and the deposit has a typical skarn alteration zoning, and the deposit is formed by the skarn type iron ore. Based on the study and summary of the key ore controlling factors and prospecting criteria of the deposit, it is considered that the skarn alteration zone near the rock mass, the gabbro body with good deep heterogeneity and the M1 group high magnetic anomaly area in the north-east are the favorable areas for further exploration of skarn type iron deposits.