阿拉善盟阿达日嘎金矿床成矿地质特征与潜力分析

Geological characteristics and potential analysis of the Adariga gold deposit in Alashan

阿达日嘎金矿床位于内蒙古阿拉善珠斯楞—乌拉尚德铜、金、铅锌成矿亚带中部,是内蒙古近年来地质矿产勘查中的重要找矿发现,目前对该矿床的成因认识还不清楚。本文重点分析了矿床地质特征,并开展了矿区地球化学和地球物理调查研究,探讨了矿床成因,初步分析判断矿床成因类型为岩浆热液型金矿床。矿区地球化学测量显示,金异常规模大,强度高。地球物理特征显示明显的高阻低极化特征。矿体的赋矿围岩主要为变质长石石英细砂岩、粉砂岩,次为辉长岩。矿区内北西向构造发育,为金元素的活化迁移提供了便利的导矿构造。岩浆岩多期次侵入,为金矿化提供了重要的物源及热源,后期构造叠加及水循环作用,成矿元素不断的活化、迁移、富集,最终形成阿达日嘎金矿。

The Adariga gold deposit is located in the central part of the Alxa Zhusiling Ula Shangde copper,gold,lead and zinc mineralization belt,Inner Mongolia.It has been an important discovery in geological and mineral exploration in Inner Mongolia in recent years,while the genetic understanding of the deposit is still unclear.This paper mainly analyzes the geological characteristics of the deposit,conducts geochemical and geophysical investigations in the mine area,discusses genesis of the deposit,and preliminarily confirm that the genetic type of the deposit is magmatic hydrothermal gold deposit.Geochemical survey in the mining area shows that gold has large abnormal modulus and high strength.The geophysical characteristics show obvious high resistance and low polarization characteristics.The host country rocks of the ore body are mainly metamorphic feldspathic quartz fine sandstone and siltstone,followed by gabbro.The northwest trending structure in the mining area is highly developed,providing a convenient guiding structure for the activation and migration of gold elements.Igneous rock intruded in many stages,which provided important material source and heat source for gold mineralization.Later structural superposition and water circulation resulted in continuous activation,migration and enrichment of ore-forming elements,and finally formed Adariga gold deposit.