地学前缘 ›› 2026, Vol. 33 ›› Issue (2): 290-310.DOI: 10.13745/j.esf.sf.2025.1.12

• 战略矿产成因机制与金属富集 • 上一篇    下一篇

准噶尔盆地中北部蚀源区岩浆岩时空分布特征与铀源条件分析

曹玉召1,2(), 吴玉2, 钟军2, 朱斌2, 韩长城1,*(), 马静辉1, 林陈雨2,3, 何中波2, 冀华丽2, 东前2, 郭子欣2   

  1. 1.新疆大学 地质与矿业工程学院, 新疆 乌鲁木齐 830047
    2.核工业北京地质研究院, 铀资源探采与核遥感全国重点实验室, 北京 100029
    3.北京科技大学 土木与资源工程学院, 北京 100083
  • 收稿日期:2024-05-16 修回日期:2025-01-21 出版日期:2026-03-25 发布日期:2026-01-29
  • 通信作者: 韩长城(1984—),男,教授,主要从事石油地质及储层特征研究。E-mail: hanchangchen@126.com
  • 作者简介:曹玉召(1999—),男,硕士研究生,地质资源与地质工程专业。E-mail: cao15230112600@163.com
  • 基金资助:
    新疆维吾尔自治区天山英才培养计划项目(2023TSYCCX0009);国家自然科学基金项目(42062010);新疆维吾尔自治区重大科技专项(2024A03003-2);中核集团青年英才项目(QNYC22-01);中国核工业地质局铀矿地质勘查项目(2022006006);中国核工业地质局铀矿地质勘查项目(22045405);中核集团集中研发项目(2021-143)

Analysis of the spatiotemporal distribution characteristics of magmatic rocks and uranium source conditions in the erosion source area of the Central and Northern Junggar Basin, China

CAO Yuzhao1,2(), WU Yu2, ZHONG Jun2, ZHU Bin2, HAN Changcheng1,*(), MA Jinghui1, LIN Chenyu2,3, HE Zhongbo2, JI Huali2, DONG Qian2, GUO Zixin2   

  1. 1. College of Geology and Mining Engineering, Xinjiang University, ürümqi 830047, China
    2. National Key Laboratory of Uranium Resources Exploration-Mining and Nuclear Remote Sensing, Beijing Research Institute of Uranium Geology, Beijing 100029, China
    3. College of Resources and Civil Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2024-05-16 Revised:2025-01-21 Online:2026-03-25 Published:2026-01-29

摘要:

蚀源区铀源的分析和评价对沉积盆地中砂岩型铀矿的勘查具有重要意义。本研究聚焦于准噶尔盆地中北部地区,通过对蚀源区岩浆岩的铀含量特征、锆石U-Pb年龄分布和Hf同位素组成特征分析,探讨蚀源区岩浆岩时空分布特征、铀源条件以及有利铀源的岩浆岩特征,进而为准噶尔盆地中北部砂岩型铀矿找矿预测提供了源区评价依据。分析结果表明,准噶尔盆地中北部蚀源区富铀地质体的岩浆活动期次主要集中在奥陶纪、晚志留世—晚泥盆世和早石炭世—晚二叠世,其次为早侏罗世。在空间分布上,蚀源区富铀地质体的铀含量和供铀能力呈现出“自北向南减小、东高西低”的趋势。阿尔泰造山带中段和东准噶尔的野马泉岛弧带具有较高的供铀能力,而西准噶尔造山带的铀含量相对较低。在岩浆岩类型上,蚀源区古铀含量最高和供铀能力最强的岩体为酸性侵入岩,其次为碱性岩和酸性喷出岩,最后是中基性岩浆岩;在岩石成因上,S型的花岗岩较A型和I型花岗岩具有更好的铀源条件;另外,锆石Hf同位素特征显示,壳源岩浆岩相较于幔源岩浆岩更为富铀。因此,多种因素的叠加促使了有利铀源的形成。最后,根据有利铀源的分布和盆地内已知铀矿化信息,提出准噶尔盆地东部卡姆斯特地区、库普盆地西北缘、福津盆地北部以及和什托洛盖盆地北部具有较好的砂岩型铀矿的成矿潜力。

关键词: 古铀含量, 蚀源区岩浆岩, 铀源条件, 砂岩型铀矿, 准噶尔盆地中北部地区

Abstract:

Identifying uranium sources in erosion source areas is crucial for exploring sandstone-type uranium deposits in sedimentary basins. This study focuses on the central and northern Junggar Basin. By analyzing the uranium content, age distribution, and zircon Hf isotope composition of magmatic rocks in the source area, we aim to: (1) characterize their spatial and temporal distribution, (2) evaluate uranium source conditions, and (3) identify the features of magmatic rocks that favor uranium supply. This work provides a basis for predicting sandstone-type uranium mineralization in the region. Our results show that uranium-rich magmatic rocks in the source area were primarily formed during the Ordovician, Late Silurian to Late Devonian, and Early Carboniferous to Late Permian, with a minor phase in the Early Jurassic. Spatially, uranium content and the ability to provide uranium generally decrease from north to south and are higher in the east than in the west. Specifically, the central Altai Orogenic Belt and the Yemaquan Island Arc Belt in the East Junggar exhibit high uranium potential, whereas the West Junggar Orogenic Belt is relatively uranium-poor. Among the different magmatic rock types, acidic intrusive rocks possess the highest inherent uranium content and strongest potential to release uranium, followed by alkaline rocks and acidic extrusive rocks, whereas intermediate-mafic magmatic rocks have the lowest potential. Regarding petrogenesis, S-type granites offer more favorable uranium source conditions than A-type and I-type granites. Additionally, zircon Hf isotopes indicate that crust-derived magmas are more enriched in uranium than those derived from the mantle. Consequently, a combination of these factors controls the formation of favorable uranium sources. Finally, by integrating the distribution of these favorable sources with known mineralization data, we propose that the Kamster area (eastern Junggar), the northwestern margin of the Kupu Basin, the northern Fujin Basin, and the northern Hestoluogai Basin are promising targets for sandstone-type uranium exploration.

Key words: ancient uranium content, erosion source area magmatic rocks, uranium source conditions, sandstone-type uranium deposits, the central and northern Junggar Basin

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