西天山库松木切克—阿克秋白地区构造与铀成矿特征

Analysis of the Structures and Uranium Metallogenic Characteristics of Kusongmuqieke-A'keqiubai Area of Western Tianshan Mountains

西天山库松木切克—阿克秋白地区地处乌拉尔—蒙古造山系,与西侧哈萨克斯坦科克切塔夫铀成矿区一并隶属于中亚成矿域,是我国境内铀多金属成矿的重要区域。该区域地质背景、铀矿化特征、构造演化与铀成矿特征、构造断裂展布与控矿特征分析结果表明,在区域构造俯冲演化背景下,区内形成了以岛弧带为主要铀成矿构造带的沟-弧-盆体系,区域性主构造决定了区内铀成矿格局,次级构造应力及不同方向构造应力的叠加,为铀大规模矿化、活化、迁移、富集、成矿提供了有利空间。因此,加强对该地区构造特征与铀成矿的研究,可为西天山库松木切克—阿克秋白地区铀矿找矿工作提供重要依据。

The Kusongmuqieke-A′keqiubai zone of western Tianshan mountains is located in Ural-Mongolia orogenic system,the Kazakhstan Kokchetav uranium metallogenic zone is located in the western part of the Kusongmuqieke-A′keqiubai zone,they are belongs to the central Asian metallogenic province, which is the important uranium metallogenic zone in our country.The regional geological background,ura-nium mineralization characteristics,tectonic evolution and uranium metallogenic characteristics,tectonic fracture distribution and ore-controlling characteristics of the Kusongmuqieke-A′keqiubai zone are ana-lyzed in detail,the analysis results show that under the background of regional tectonic evolution of sub-duction,the trench-arc-basin system which taking the island arc belt as the main uranium metallogenic tectonic belt is formed,uranium mineralization pattern in the area is determined by the regional main structures,the advantageous spaces of the mineralization,activation,migration,enrichment and mineraliza-tion with large scale of uranium are provided by the superposition of secondary tectonic stress and the stresses of different directions.Therefore,strengthen the study of the structures characteristics and uranium metallogenic can provide some important reference for the uranium deposit prospecting work in the Kuso-ngmuqieke-A'keqiubai zone.