柴西北缘花土沟地区新近系油砂山组沉积特征及铀源分析  

The Characteristics of Sedimentary and Uranium Source Analysis of the Neogene Youshashan Formation in Huatugou Area, North Qaidam

作　　者：张超[1] 王善博 程银行 俞礽安 于航 冯平[2] 奥琮 李建国 李志丹 ZHANG Chao;WANG Shan-bo;CHENG Yin-hang;YU Reng-an;YU Hang;FENG Ping;AO Cong;LI Jian-guo;LI Zhi-dan(Tianjin Center,China Geological Survey,Tianjin 300170,China;The Nuclear Industry Geological Survey 283 Brigade in Sichuan Province,Dazhou 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]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》2020年第9期3427-3434,共8页Science Technology and Engineering

基　　金：中国地质调查项目(DD20190119)。

摘　　要：柴北缘花土沟地区新近系油砂山组含铀岩系为绿灰色碎屑岩沉积建造。区域内主要发育扇三角洲、滨浅湖相。含铀岩系受滨浅湖相沉积体系控制。研究区内铀源具有多源性特点,基底和盖层铀丰度较高。通过野外调查实测剖面和编录铀矿调查钻孔发现油砂山组具有泥-砂-泥结构特征,砂层厚度适宜,倾角较缓,属于宽缓的山前斜坡带,有利于含矿砂体及富氧流体进入层间,形成层间氧化带及铀的富集。The uranium-containing rocks in the Youshashan Formation in Huatugou area, North Qaidam Basin, Qinghai, NW China, are a series of the Neogene greenish gray clastic facies from fan-delta to shallow-coastal lake deposits. Distribution of the uranium-rich rocks is controlled by shallow lake sedimentary system. The uranium deposit features of multiple sources and has high uranium abundance in both the basement and cover. By field geological survey and borehole profiling, it was found that the Youshashan Formation is of mud-sand-mud sandwich structure. The sand unit has moderate thickness and gently dips, indicative of a broad and gentle piedmont slope zone, which is conducive to the distribution of oxygen-rich fluid among sandy interlayers, and uranium enrichment and mineralization in the study area.

关 键 词：柴北缘 新近系 油砂山 沉积相系 砂岩型铀矿 

分 类 号：P536[天文地球—古生物学与地层学]