准噶尔盆地东部北三台地区砂岩型铀矿赋矿围岩元素地球化学特征及地质意义  

Elemental Geochemical Characteristics of the Ore⁃bearing Wall Rock of the Sandstone⁃type Uranium Deposits in the Beisantai Area of the Eastern Junggar Basin and Their Geological Significances

作　　者：关宝文 王晋 李满根[2,3] 袁琪 陈念楠 唐湘飞[5] 吴声明 段建兵 黄思俊 曾宪智 GUAN Baowen;WANG Jin;LI Mangen;YUAN Qi;CHEN Niannan;TANG Xiangfei;WU Shengming;DUAN Jianbing;HUANG Sijun;ZENG Xianzhi(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Earth Science,East China University of Technology,Nanchang 330013,China;National Key Laboratory of Uranium Resource Exploration-Mining and Nuclear Remote Sensing,East China University of Technology,Nanchang 330013,China;Zhejiang Zhezhong Geological Engineering Survey Institute Co.,Ltd.,Jinhua 321000,China;Geologic Party No.216,CNNC,Urumqi 830011,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,江西南昌330013 [2]东华理工大学地球科学学院,江西南昌330013 [3]东华理工大学铀资源探采与核遥感全国重点实验室,江西南昌330013 [4]浙江省浙中地质工程勘察院有限公司,浙江金华321000 [5]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《东华理工大学学报(自然科学版)》2025年第1期15-29,共15页Journal of East China University of Technology(Natural Science)

基　　金：国家自然科学基金项目(42362020);核资源与环境国家重点实验室开放基金项目(2020NRE14);江西省教育厅科学技术研究项目(GJJ2200710);中国核工业地质局核工业二一六大队项目(H202200098);江西省研究生创新基金项目(YC2023 S575)。

摘　　要：为揭示准噶尔盆地东部北三台地区沙湾组铀矿化细粒碎屑岩的源岩风化程度、物源性质及构造背景,对其开展显微镜观察、元素地球化学分析等研究。结果表明,北三台地区沙湾组细粒碎屑岩为岩屑砂岩,轻重稀土元素分馏差异性(ω(LREE)/ω(HREE)平均为5.78)较明显;源区化学风化程度(CIA指数平均为62.77)相对较低,物源以中酸性火成岩为主,源区为研究区北部的卡拉麦里山。该区砂岩型铀矿的形成环境处于从弱氧化弱还原的转化阶段,并在黄铁矿、油气等还原作用下富集成矿。In order to reveal the weathering degree,material source properties and tectonic background of the source rocks of the uranium mineralised fine⁃grained clastic rocks of the Shawan Formation in the Beisantai area of the eastern Junggar Basin,microscopic observation and elemental geochemical analyses were conducted.The re⁃sults show that the fine⁃grained clastic rocks of the Shawan Formation in the Beisantai area are clastic sandstones,with relatively obvious light and heavy rare earth element fractionation variability(the average value ofω(LREE)/ω(HREE)is 5.78);the chemical weathering degree of the source area(the average CIA values is 62.77)is relatively low,and the source is dominated by moderate⁃acidic igneous rocks,with the source area be⁃ing the Kalamaili Mountain in the northern part of the study area.The environment for the formation of sandstone⁃type uranium ores in the area is in the stage of transformation from weak oxidation to weak reduction and enriched by the reduction of pyrite,oil,and gas.

关 键 词：元素地球化学 新近系 沙湾组 砂岩型铀矿 准噶尔盆地东部 

分 类 号：P619.14[天文地球—矿床学]