准噶尔盆地南缘硫磺沟地区中-新生代构造演化与侏罗系铀成矿的关系  

Relationship Between Mesozoic-Cenozoic Structural Evolution and Jurassic Uranium Mineralization in Liuhuanggou Area,Southern Margin of Junggar Basin

作　　者：闫晶晶[1] 贾为卫 黄松 YAN Jingjing;JIA Weiwei;HUANG Song(Geologic Party No.216,CNNC,Urumqi,Xinjiang 830011,China)

机构地区：[1]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《铀矿地质》2022年第6期1022-1031,共10页Uranium Geology

基　　金：中国核工业地质局全国铀矿资源调查评价计划项目“新疆准噶尔盆地铀矿资源调查评价与勘查”(编号:202206)资助。

摘　　要：为了研究准噶尔盆地南缘中-新生代构造演化对砂岩型铀成矿的控制和影响,文章结合准噶尔盆地南缘硫磺沟地区近年勘查成果及样品分析,探讨了准南中-新生代构造演化与铀成矿的关系,分析认为:早-中侏罗世稳定坳陷沉降阶段,在接受北天山碎屑物质沉积时期铀形成了早期预富集,形成了头屯河组富含还原介质的厚大辫状河相沉积砂体;晚侏罗世-早白垩世挤压隆升阶段,受构造抬升剥蚀和古气候的变化,为蚀源区铀的活化与迁移提供便利条件,有利于含氧含铀水的渗入,形成层间氧化带型铀矿体;晚白垩世-古近纪弱伸展阶段,先抬升后伸展的构造演化特点、相对稳定的构造环境有利于铀成矿作用的持续进行;新近纪以来强烈构造挤压与快速隆升阶段,强烈的构造运动对早期铀矿以剥蚀改造及破坏作用为主。In order to study the control and influence of Meso-Cenozoic structural evolution on sandstone type uranium mineralization in the southern margin of Junggar Basin,the relationship between Meso-Cenozoic tectonic evolution and uranium mineralization in southern Junggar Basin was discussed with the combination of recent exploration results and sample analysis in the Liuhuanggou area in the southern margin of Junggar Basin.The analysis showed that early pre-enrichment of uranium was formed during the deposition of clastic materials in the Northern Tianshan Mountains during the Early-Middle Jurassic stable depression subsidence stage.Thick braided fluvial sedimentary sand bodies rich in reducing media were formed in Toutunhe Formation;in the Late Jurassic to Early Cretaceous compression uplift stage,tectonic uplift,denudation and paleoclimate changes provided convenient conditions for the activation and migration of uranium in the erosion source area,which was conducive to the infiltration of oxygen-containing uranium water and the formation of interlayer oxidation zone type uranium ore bodies;in the weak extension stage from Late Cretaceous to Paleogene,the tectonic evolution characteristics of first uplift and then extension,and the relatively stable tectonic environment were conducive to the continuation of uranium mineralization;in the stage of strong tectonic compression and rapid uplift since Neogene,the early formed uranium deposits were mainly denuded and destroyed by strong tectonic movement.

关 键 词：构造演化 侏罗系 砂岩型铀矿 准噶尔盆地 

分 类 号：P542[天文地球—构造地质学] P619.14[天文地球—地质学]