德令哈坳陷新近系层间氧化带砂岩型铀矿成矿条件及成矿潜力  

Metallogenic Conditions and Metallogenic Potential of Sandstone Type Uranium Deposit in Neogene Interlayer Oxidation Zone in Delingha Depression

作　　者：晁海德 陈建洲 李吉庆 赵维孝 任文恺 刘世明[4] 蔡廷俊 赵洪岳 刘立波 Chao Haide;Chen Jianzhou;Li Jiqing;Zhao Weixiao;Ren Wenkai;Liu Shiming;Cai Tingjun;Zhao Hongyue;Liu Libo(The Fourth Geological Exploration Institute of Qinghai Province,Xining,Qinghai,810000,China;Key Laboratory of shale gas resources of Qinghai Province,Xining,Qinghai,810000,China;The Second Geological Exploration Institute of Qinghai Province,Xining,Qinghai,810000,China;Hebei University of Engineering,Handan,Hebei,056009,China)

机构地区：[1]青海省第四地质勘查院,青海西宁810000 [2]青海省页岩气资源重点实验室,青海西宁810000 [3]青海省第二地质勘查院,青海西宁810000 [4]河北工程大学,河北邯郸056009

出　　处：《新疆地质》2022年第3期405-411,共7页Xinjiang Geology

基　　金：青海省地质矿产勘查开发局地质勘查项目(青地矿科[2020]61、青地矿科[2021]61)资助。

摘　　要：从铀源、岩性-岩相、构造演化、水文地质、后生蚀变特征等方面进行研究,对柴达木盆地东北缘德令哈坳陷新近系层间氧化带砂岩型铀矿成矿条件进行综合分析,探讨了成矿潜力。结果表明,研究区具备多铀源条件,北部、东部、西部一带的中酸性岩体及侏罗系等富铀地层提供了丰富的铀源;油砂山组广泛发育辫状河三角洲、辫状河相,“泥-砂-泥”相对稳定;欧龙布鲁克凸起内缓倾斜坡带发育,其内层间氧化带发育且分带特征明显;“补-径-排”水动力系统发育较完善。结合水系地球化学异常、成矿事实认为:柴达木盆地东北缘德令哈坳陷新近系层间氧化带砂岩型铀矿成矿潜力较好,欧龙布鲁克凸起内油砂山组发育地段,尤其是与辫状河相、辫状河三角洲相叠合的区域是重点找矿地段。This paper studies the uranium source,lithology lithofacies,structural evolution,hydrogeology and epigenetic alteration characteristics,comprehensively analyzes the metallogenic conditions of Neogene interlayer oxidation zone sandstone type uranium deposit in Delingha depression,northeast margin of Qaidam Basin,and discusses the metallogenic potential.The results show that the study area has multi uranium source conditions,and the intermediate acid rocks in the north,East and West and the uranium rich strata such as Jurassic provide rich uranium sources;Braided River Delta and braided river facies are widely developed in Youshashan formation,and"mud sand mud"is relatively stable;The gently inclined slope zone is developed in oulongbrooke uplift,and the interlayer oxidation zone is developed and has obvious zoning characteristics;The"supplement diameter discharge"hydrodynamic system is well developed.Combined with the geochemical anomaly of water system and metallogenic facts,it is considered that the Neogene interlayer oxidation zone sandstone type uranium deposit in Delingha depression,northeast margin of Qaidam Basin has good metallogenic potential,and the development section of Youshashan formation in oulongbrooke uplift,especially the area overlapped with braided river facies and braided river delta facies,is the key prospecting section.

关 键 词：德令哈坳陷 砂岩型铀矿 成矿地质条件 成矿潜力 

分 类 号：P578.493[天文地球—矿物学]