Sequence Stratigraphy of the Lower Cretaceous Uraniferous Measures and Mineralization of the Sandstone-hosted Tamusu Large Uranium Deposit,North China

作     者：LIU Bo SHI Zhiqiang PENG Yunbiao ZHANG Pengfei LI Peng 

作者机构：Institute of Sedimentary GeologyChengdu University of TechnologyChengdu 610059China Geologic Party No.208China Nuclear GeologyBaotouInner Mongolia 014010China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2022年第96卷第1期

页      面：167-192页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：funded by the project of Investigation and Exploration of Uranium Deposits in Bayingobi Basin(Grant No.201903,202203) China Nuclear Geology,CNNC 

主　　题：Bayingobi Formation sequence stratigraphy fan delta uranium mineralization Tamusu uranium deposit 

摘      要：The Bayingobi basin is the Mesozoic-Cenozoic basin in North China in which the Tamusu uranium deposit is *** ore-target layer of the deposit is the Lower Cretaceous Bayingobi Formation,which developed as a fan deltashallow lacustrine *** distributary channel sand body of the fan delta plain and the underwater distributary channel sand body of the fan delta front formed a favorable uranium reservoir,so the study of sequence stratigraphy is extremely important to understanding the genesis of uranium *** the basis of field investigation and a large number of borehole logs,the high resolution sequence stratigraphy of the Lower Cretaceous is divided and the system tracts of different periods are *** relationship between deposition,interlayer oxidation and uranium enrichment is *** Lower Cretaceous Bayingobi Formation can be divided into two fourth-order sequences(Sq1 and Sq2).The lower member of the Bayingobi Formation is referred to as Sq1,which is composed of a falling-stage system tract(FSST)on *** the other hand,the upper member of the Bayingobi Formation is referred to as Sq2,which is composed of a lowstand system tract(LST),transgressive system tract(TST)and highstand system tract(HST).The lowstand system tract forms a favorable stratigraphic structure(mud-sand-mud formation)with the lacustrine mudstone of the overlying transgressive system tract,that is conducive for the migration of uranium-bearing oxygen *** organic matter and pyrite in the fan delta sand body,as well as the dark mudstone in the distributary bay,provided a reducing medium for uranium *** ore body mainly occurs in the distributary channel,underwater distributary channel or the mouth bar of the fan *** a result of the moderate thickness,high permeability,favorable barrier and rich reducing medium,the rich ore body mainly occurs in the underwater distributary channel and mouth bar sand body of the delta *** on study