华南地质2026，Vol.42Issue(4)：648-663,16.DOI:10.3969/j.issn.2097-0013.2026.04.007
柴达木盆地北缘鱼卡地区尕秀西段中侏罗统石门沟组沉积特征及铀成矿条件分析
Sedimentary Characteristics and Uranium Mineralization Conditions of the Jurassic Shimengou Formation in the Western Section of Gaxiu in the Yuqia Area of the Northern Margin of the Qaidam Basin
摘要
Abstract
[Objective]The Middle Jurassic sandstone-type uranium deposits in the Qaidam Basin are char-acterized by favorable metallogenic geological settings and substantial resource potential.This study presents a systematic investigation into the uranium metallogenic geological conditions of the Middle Jurassic Shimen Formation in the Yuqa-Gaxiu West section of the northern Qaidam Basin margin,aiming to provide a scien-tific basis for breakthroughs in sandstone-type uranium exploration within the Qaidam Basin.[Methods]Based on the systematic integration of existing coalfield geological data,reprocessing of borehole records,and verification of radioactive anomalies,this study conducts a comprehensive investigation into the uranium metallogenic geological conditions,encompassing sedimentary characteristics,uranium provenance,structural evolution,hydrogeology,lithofacies paleogeography,redox environment,and uranium mineralization features,thereby elucidating the metallogenic controls and ore-forming potential.[Results]The research results indicate that the Middle Jurassic Shimen'gou Formation is stratigraphically subdivided into the upper shale member(J2s2)and the lower coal-bearing member(J2s1),which collectively host three distinct sand bodies:the sand body overlying the oil shale,the sand body intercalated between Coal Seams 3 and 4,and the sand body situated between Coal Seams 4 and 5.Each sand body is separated by coal seams and exhibits a characteristic"mudstone-sandstone-mudstone"stratigraphic configuration.[Conclusions]Uranium mineralization in the study area is dually controlled by yellow oxidation zones and deep-seated hydrocarbons.Surficial uranium sources were oxidized and subsequently migrated into sandstone bodies via groundwater,where they were precipitated.The favorable hydrophobicity of organic-rich oil shale and coal seam floor rocks,coupled with early-stage uranium complexation and enrichment,provided advantageous conditions for subsequent uranium concentration in overlying sandstones.Consequently,the western Gasaxiu segment is considered to possess favorable geological conditions and promising prospects for sandstone-type uranium mineralization.关键词
沉积特征/岩相古地理/石门沟组/成矿条件/层间氧化带/砂岩型铀矿/柴达木盆地北缘Key words
sedimentary characteristics/lithofacies paleogeography/Shimengou Formation/metallogenic conditions/interlayer oxidation zone/sandstone-type uranium deposit/Northern Margin of Qaidam Basin分类
天文与地球科学引用本文复制引用
王伟龙,赖天功..柴达木盆地北缘鱼卡地区尕秀西段中侏罗统石门沟组沉积特征及铀成矿条件分析[J].华南地质,2026,42(4):648-663,16.基金项目
中国地质调查局项目(12120113075900) （12120113075900）
