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uranium Metallogeny in Fault-Depression Transition Region:A Case Study of the tamusu uranium deposit in the Bayingobi Basin

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Journal of Earth Science 2022年第2期33卷 409-421页

作者： Liqun Wu Yangquan Jiao Yunbiao Peng Hui Rong Key Laboratory of Tectonics and Petroleum Resources Ministry of EducationChina University of GeosciencesWuhan 430074China Geologic Party No.208 BOGCNNCBaotou 014040China

Compared to the sandstone-type uranium deposits in the Ordos Basin and the Songliao Basin,the tamusu uranium deposit in the Bayingobi Basin formed in fault-depression transition region displays distinctive ***,the uranium-bearing sandstones and their interlayer oxidation zone extend longitudinally no more than ten ***,gravity flow sediments are more common in the uranium-bearing *** facies analysis indicates that the Upper Member(orebearing horizon)of the Bayingobi Formation was largely deposited in fan deltas that prograded into lakes during period of relatively dry *** distribution patterns of five facies associations along with two depositional environments(fan delta,lake)were reconstructed in this *** results demonstrated that the depositional systems and their inner genetic facies played different roles in uranium reservoir sandstone,confining beds(isolated barrier beds)and reduction geologic bodies during uranium mineralization process.

关键词： sandstone-type uranium deposit fan delta lake fault-depression transition tamusu uranium deposit Bayingobi Basin ore deposit geology

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Sequence Stratigraphy of the Lower Cretaceous Uraniferous Measures and Mineralization of the Sandstone-hosted tamusu Large uranium deposit,North China

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 167-192页

作者： LIU Bo SHI Zhiqiang PENG Yunbiao ZHANG Pengfei LI Peng Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China Geologic Party No.208 China Nuclear GeologyBaotouInner Mongolia 014010China

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

关键词： Bayingobi Formation sequence stratigraphy fan delta uranium mineralization tamusu uranium deposit

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