柴西南缘新近系铀储层发育与铀成矿水文地质条件分析  

Analysis of Neogene Uranium Reservoir Development and Uranium Mineralization Hydrogeological Conditions in Southwest Qaidam Basin

作　　者：杨君 奥琮[1,2,3] 孟利山 滕雪明 魏学斌 王铎 冯平 于航[5] YANG Jun;AO Cong;MENG Li-shan;TENG Xue-ming;WEI Xue-bin;WANG Duo;FENG Ping;YU Hang(Key Laboratory of the Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources, Xining 810012, China;Tianjin Center, China Geological Survey(CGS), Tianjin 300170, China;Key Laboratory of Uranium Geology, China Geological Survey(CGS), Tianjin 300170, China;Exploration and Development Research Institute of Qinghai Oilfield, Petro China, Dunhuang 736202, China;The Nuclear Industry Geological Survey 283 Brigade in Sichuan Province, Dazhou 635000, China)

机构地区：[1]青海省青藏高原北部地质过程与矿产资源重点实验室,西宁810012 [2]中国地质调查局天津地质调查中心,天津300170 [3]中国地质调查局铀矿地质重点实验室,天津300170 [4]中国石油青海油田勘探开发研究院,敦煌736202 [5]四川省核工业地质局二八三大队,达州635000

出　　处：《科学技术与工程》2022年第3期931-938,共8页Science Technology and Engineering

基　　金：青海省青藏高原北部地质过程与矿产资源重点实验室项目(2019-KY-02);中国地质调查局项目(DD20190119,DD20190813)。

摘　　要：柴达木西南缘花土沟地区新近系上油砂山组是重要的含铀岩系之一,其水文地质条件与铀成矿关系密切。通过分析地下水类型、水化学特征等,结合野外地质调查资料,认为本地区基底和盖层富铀,风化剥蚀后随地下水搬运至盆地内富集成矿,提供铀源;上油砂山组时期西北高东南低的构造格局,控制含氧含铀地下水的渗流方向;辫状河三角洲平原分流河道水动力适于铀矿沉淀富集成矿,成为潜在的铀储层;上新世末期含氧含铀流体下渗进入上油砂山组潜在铀储层中被还原,最终成矿。The Neogene upper Youshashan formation in Huatugou area on the southwest margin of Qaidam is one of the important uranium bearing rock series,and its hydrogeological conditions are closely related to uranium mineralization.Based on the analysis of groundwater types and hydrochemical characteristics,combined with the field geological survey data,it is considered that the basement and caprock in this area are rich in uranium,which is transported to the rich integrated ore in the basin with groundwater after weathering and denudation to provide uranium source.During the period of upper Youshashan formation,the structural pattern of high in Northwest and low in Southeast controls the seepage direction of oxygenated and uranium bearing groundwater.The distributary channel hydrodynamics of braided river delta plain is suitable for uranium precipitation,enrichment and mineralization,and becomes a potential uranium reservoir.At the end of Pliocene,the oxygenated uranium bearing fluid infiltrated into the potential uranium reservoir of upper Youshashan formation,was reduced and finally mineralized.

关 键 词：柴西南缘 花土沟 新近系 水动力 砂岩型铀矿 

分 类 号：P624[天文地球—地质矿产勘探]