新疆北金齐火山盆地铀-多金属矿化特征与控矿因素分析  

Uranium-polymetallic Mineralization Characteristics and Ore-controlling Factors in Beijinqi Volcanic Basin,Xinjiang

作　　者：陈浩[1] 杨文龙[1] 张叶军 庞星 钟仕诚 尹松[1] 鲁克改[1] CHEN Hao;YANG Wenlong;ZHANG Yejun;PANG Xing;ZHONG Shicheng;YIN Song;LU Kegai(Geologic Party No.216,CNNC,Urumqi,Xinjiang 830011,China)

机构地区：[1]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《铀矿地质》2024年第2期238-249,共12页Uranium Geology

基　　金：中国核工业地勘基金项目“新疆北部重点区铀-多金属矿调查评价与勘查”(编号:2022008)资助。

摘　　要：北金齐火山盆地具有较好的铀矿找矿基础和成矿潜力,其铀矿化特征在新疆北部火山岩带具有普遍性。文章以北金齐火山盆地南、北缘和中部的3条典型铀-多金属矿化带为研究对象,较为全面地阐述了各带地质、矿化及蚀变组合等特征,并通过总结分析区内主要控矿因素及其控矿作用,初步建立了区域铀成矿模式。北金齐地区铀-多金属成矿具多因素联合控矿作用,铀-多金属矿化整体分布受火山盆地及北东东向区域大断裂控制,且盆地南、北缘大断裂较中部火山机构成矿地质条件优越。盆地内大断裂两侧的次级断裂带、裂隙带为主要含矿构造;酸性火山熔岩与酸性凝灰(角)砾岩为主要赋矿岩性,并为铀成矿提供一部分铀源;花岗斑岩等岩浆岩侵入活动为区内铀-多金属矿化主要成矿作用,推测火山机构塌陷后,花岗斑岩等岩浆岩侵入活动带来的含矿流体沿断裂贯入,在有利的构造和岩性中富集成矿。In Beijinqi volcanic basin,the former exploration efforts have evaluated the uranium mineralization potential,which bears the representative characteristics in the volcanic rock belt of northern Xinjiang.In this paper,three typical uranium-polymetallic mineralization zones in the southern and northern margin and the central part of the basin were studied.The characteristics of geology,mineralization and altered mineral assemblages of each zone were comprehensively described,a regional uranium metallogenic model was established by summarizing and analyzing the main ore controlling factors and their effects.Uranium polymetallic mineralization in Beijinqi region is controlled by multiple factors.The overall distribution of uranium-polymetallic mineralization is controlled by volcanic basins and NEE-trending regional major faults,the faults in the northern and southern margin of the basin are more important than those in the central.The secondary fault zone and fracture zone on both sides of the major fault in the basin are the main ore-bearing structures.Acid volcanic lava and acid tuff(breccia)are the main host rock which also provide some uranium sources to the uranium mineralization.The intrusion of granite-porphyry and other magmatic rocks is the main metallogenic events of uranium-polymetall,the ore-bearing fluids was migrated by the intrusion activities of magma such as granite porphyry penetrating along the fault resulted from the collapse of volcanic institutions,and enriched in the favorable structures and lithology.

关 键 词：北金齐火山盆地 铀-多金属 控矿因素 成矿作用 

分 类 号：P619.14[天文地球—矿床学]