内蒙古索伦山菱镁矿成矿地质条件与找矿潜力分析

产于内蒙古索伦山缝合带蛇绿岩中的菱镁矿,其深入研究对于菱镁矿的勘查、增加战略矿产资源以及国民经济的发展有重大意义。本文对内蒙古索伦山地区菱镁矿进行了系统的调查和研究,通过归纳索伦山地区菱镁矿矿床地质特征,探讨了索伦山地区菱镁矿矿床的成矿地质条件,在此基础上,分析和评价了索伦山地区菱镁矿的找矿潜力。索伦山地区菱镁矿产于索伦山蛇绿岩的地幔橄榄岩内,受岩体内部微小构造控制,矿体贫富受风化程度的制约,受超基性岩风化淋滤形成。菱镁矿与超基性岩硅质风化壳在成因上具有耦合关系,上部为风化淋滤残留物—超基性岩硅质风化壳,下部为风化淋滤的产物—菱镁矿。索伦山地区含菱镁矿的地幔橄榄岩岩体巨大,深部矿体众多,与国内西藏巴夏式菱镁矿在成矿条件和成矿模式方面相一致。所以,索伦山地区具有较大的菱镁矿找矿潜力。

Metallogenic geological conditions and prospecting potential of the Solonker magnesite deposit in Inner Mongolia

The magnesite deposit in the ophiolites of the Solonker suture zone in Inner Mongolia is of great significance to surveys of magnesite, increasing strategy mineral resources and national economy development. This paper presents a systematic investigation and study on this deposit. We have summarized its basic geological characteristics and discussed the metallogenic geological conditions, then analyzed and evaluated its prospecting potential. The magnesite of the Solonker area occurs in the mantle peridotite of the ophiolites in the Solonker Mountains, which is controlled by micro structure in the rock bodies. Mineralization enrichment was constrained by weathering degrees of rocks, and the magnesite was generated by ultrabasic rock weathering-infiltration. There is a coupling relationship between the magnesite formation and ultrabasic rock silicic weathering crust. The upper part of the deposit is the residual of weathering-infiltration product, while the lower part is the magnesite orebody. The magnesite-bearing mantle peridotite rock mass is huge, and many orebodys are present in the deep subsurface with the same metallogenic geological conditions andmetallogenic model as the Baxia magnesite in Tibet. So, there is a larger prospecting potential in the Solonker area.