世界核地质科学2025，Vol.42Issue(6)：1162-1180,19.DOI:10.3969/j.issn.1672-0636.2025.06.003
塔里木盆地库车坳陷吉迪克组古环境演化及其对铀成矿的制约
Paleoenvironmental evolution of the Jidike formation in the Kuqa depression and its constraints on uranium mineralization
摘要
Abstract
To investigate the paleoenvironmental evolution and its constraints on uranium mineralization of the Neogene Jidike formation in the Kuqa depression,Tarim basin,this study analyzed major,trace,and rare earth elements of 29 sandstone and mudstone samples(comprising red-brown and gray-green lithologies)from the western Qiulitage structural belt.The results indicate that the sediments were primarily derived from intermediate-acidic igneous rocks in an active continental margin setting.The source area underwent incipient to moderate chemical weathering(average CIA ≈ 62),characterized by rapid tectonic erosion and deposition.The Jidike formation was deposited under an overall arid to semi-arid climate with distinct environmental differentiation:red-brown beds record a strongly oxidizing,brackish environment under hot-arid conditions,evidenced by high w(Sr)/w(Cu)and low w(V)/w(Cr)and w(Ni)/w(Co)ratios;whereas gray-green beds were formed in saline to hypersaline(high w(Sr)/w(Ba)),transitional weak oxidation-weak reduction environments during relatively humid periods.This"red-green"lithological combination,controlled by paleoclimatic cycles,provides essential elements for uranium mineralization:the red-brown oxidized sandbodies serve as migration channels for uranium-rich oxygenated fluids,while the high-salinity,reducing gray-green beds act as critical reduction barriers and precipitation spaces.关键词
库车坳陷/吉迪克组/地球化学特征/古环境演化/铀成矿Key words
Kuqa depression/Jidike formation/geochemical characteristics/paleoenvironmental evolution/uranium mineralization分类
天文与地球科学引用本文复制引用
GENG Yingying,HUANG Shaohua,XU Qiang,LIU Nian,GUO Qiang,JIANG Yayi..塔里木盆地库车坳陷吉迪克组古环境演化及其对铀成矿的制约[J].世界核地质科学,2025,42(6):1162-1180,19.基金项目
中国核工业地质局"塔里木盆地中新生代构造-水动力系统专项编图"资助(编号:22007004) Supported by Specialized Mapping of Mesozoic-Cenozoic Tectono-Hydrodynamic Field in the Tarim Basin of China Nuclear Geology,CNNC(No.22007004) （编号:22007004）
