柴西北缘中新生代构造演化及铀源分析  

Mesozoic-cenozoic tectonic evolution and uranium source analysis in northwestern Qaidam basin

作　　者：张超[1,2] 王善博 俞礽安 程银行 冯平 于航[3] ZHANG Chao;WANG Shan-bo;YU Reng-an;CHENG Yin-hang;FENG Ping;YU Hang(Tianjin Centre,China Geological Survey,Tianjin 300170,China;North China Center for Geoscience Innovation Tianjin 300170,China;The nuclear industry geological survey 283 brigade in Sichuan province,Dazhou Sichuan 635000,China)

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]华北地质科技创新中心,天津300170 [3]四川省核工业地质局二八三大队,四川达州635000

出　　处：《华北地质》2021年第2期67-73,共7页North China Geology

基　　金：中国地质调查局地质调查项目“:鄂尔多斯、柴达木等盆地砂岩型铀矿调查(DD20190119)”。

摘　　要：柴达木盆地在中、新生代以来构造演化共经历了大约两次从断陷-坳陷-挤压隆升的完整大型构造演化阶段。铀矿成矿受构造条件、沉积相、地层岩性、水文地质条件、氧化作用等因素综合控制,盆地内稳定的构造斜坡带对铀成矿最为有利,沉积体系中辫状河三角洲是最有利的成矿部位,三角洲平原分流河道砂体、三角洲前缘砂体是最有利的容矿砂体。盆地中铀的来源主要有基底铀源、沉积盖层铀源及蚀源区铀源三部分,其中中侏罗统的含煤碎屑岩建造,可作为后生成矿的铀源。Since the Mesozoic and Cenozoic,the Qaidam Basin has undergone about two complete large-scale tectonic evolution stages characterized by fault depression to compressive uplift.The tectonic movement reversed in late Jurassic-Cretaceous.Uranium mineralization is controlled by many factors including tectonic conditions,sedimentary facies,stratigraphic lithology,hydrogeological conditions and so on.The stable structural slope zone in the basin is most favorable for uranium mineralization.Braided river delta is the most favorable place for oreforming and precipitation in the sedimentary system.Delta plain distributary channel sand bodies and delta front sand bodies are the most favorable ore-hosting sand bodies.The uranium sources in the basin includes deep uranium source,sedimentary cover uranium source and erosion uranium.The coal-bearing clastic rock formation of middle Jurassic canprovide uranium provenance for the post-mineralization.

关 键 词：柴西北缘 中新生代 构造演化 铀源 

分 类 号：P536[天文地球—古生物学与地层学]