内蒙古园包山地区换新滩金多金属矿矿床地质特征及成因分析

Geological characteristics and genesis analysis of the Huanxintan gold polymetallic deposit in the Yuanbaoshan area,Inner Mongolia

换新滩金多金属矿是内蒙古北山地区新发现的一处矿点,位于额济纳旗-雅干海西期铁、金、铜、钼、镍三级成矿带内,成矿地质条件优越。本文在系统分析区域成矿地质背景、矿区地质特征、矿床地质特征的基础上,对矿床成因、成矿潜力进行了研究。研究认为,换新滩金多金属矿成矿作用与晚石炭世二长花岗岩关系密切,晚石炭世岩浆活动为矿床的形成提供了成矿元素活化、迁移和富集的热源条件和驱动力;断裂构造及其次级裂隙系统控制了矿体的产状、形态和矿化强度,提供了成矿流体的聚集空间和沉淀场所,矿点具有中低温热液石英脉型-蚀变岩型的成矿特征。

The Huanxintan gold polymetallic ore deposit is a newly discovered mine site in the Beishan area of Inner Mongolia.The deposit is located in the hercynian period iron,gold,copper,molybdenum and nickel metallogenic belts of the Ejinaqi-Yangan,and shows superior prospecting potential.Based on the systematic analysis of regional ore-forming geological background,geological characteristics of the mining area and geological characteristics of the deposit,the genesis and metallogenic potential of the deposit are studied.The study suggests that the mineralization of the Huanxintan gold polymetallic deposit is closely related to the Late Carboniferous monzonitic granite.The late carboniferous magmatism provides the heat source conditions and driving forces for the activation,migration and enrichment of ore-forming elements;the fault structure and its secondary fracture system control the occurrence,shape and mineralization intensity of the ore body,and provide the accumulation space and sedimentation site of the ore-forming fluid,which is consistent with the metallogenic characteristics of the medium-low temperature hydrothermal quartz vein type-altered rock type.