| 二连盆地桑根达来凹陷赛汉组岩石学、矿物学特征及其对铀矿富集的指示 |
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| 引用本文：朱强,司庆红,文思博,俞礽安,李光耀,张博,王善博,彭胜龙,李健敏.2026.二连盆地桑根达来凹陷赛汉组岩石学、矿物学特征及其对铀矿富集的指示[J].地球学报,47(4):805-819. |
| DOI：10.3975/cagsb.2025.112011 |
| 摘要点击次数: 171 |
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| 基金项目:本文由国家重点研发计划项目(编号: 2023YFC2906700)、国家自然科学基金项目(编号: 92162212)、中国地质调查局地质调查项目(编号: DD20240204701; DD20243379; DD20190119-03)和国际地球科学计划项目(编号: IGCP675)联合资助。 |
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| 中文摘要:为查明二连盆地桑根达来凹陷赛汉组岩石学、矿物学特征, 揭示其对铀富集规律的指示作用, 本文通过偏光显微镜、扫描电镜、电子探针、XRD、岩心红外光谱扫描、元素地球化学分析等多种方法, 对赛汉组矿物蚀变类型、组分、含量、铀矿化规律等特征进行研究。结果表明: (1)凹陷边缘西部斜坡带, 主体为辫状河-辫状河三角洲-浅湖相沉积, 主要含矿层位为赛汉组上段, 岩石学特征显示该区物源近, 堆积速度快, 沉积相变大。(2)赛汉组地层有机质(烃类、炭屑)、黄铁矿等还原介质含量丰富, 又兼受深部含烃流体作用。(3)砂岩型铀矿物以铀石为主, 与黄铁矿、钛铁矿、方解石、有机质等伴生紧密, 同时锆石、钍石、独居石、磷钇矿等矿物中铀含量较高, 显示铀源供给距离较近。通过综合分析岩石学、矿物学特征, 认为研究区赛汉组铀矿化是早期的沉积预富集加上后期的叠加改造富集的结果, 下一步工作可以将砂体厚度稳定区域和烃类流体逸散区作为有利成矿区进行追索, 为该地区拓展铀矿勘查方向提供了依据。 |
| 中文关键词:赛汉组 岩石学 矿物学 铀成矿 桑根达来凹陷 |
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| Petrological and Mineralogical Characteristics of the Saihan Formation in the Sanggendalai Sag of the Erlian Basin and Their Indications for Uranium Enrichment |
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| Abstract:To investigate the petrological and mineralogical characteristics of the Saihan Formation in the Sanggendalai sag of the Erlian Basin, and to reveal its indicative role of uranium enrichment laws, the characteristics of mineral alteration types, components, contents, and uranium mineralization regularities of the Saihan Formation are studied by means of various methods such as polarizing microscope, scanning electron microscope, electron probe, XRD, core infrared spectroscopy scanning, and elemental geochemical analysis. The results showed that: (1) The main ore bearing layer in the western slope zone of the sag edge is the upper section of the Saihan Formation, which is mainly composed of braided river-braided-river delta-shallow lake sedimentation. The petrological characteristics show that this area is close to the sediment source, with a fast accumulation rate and significant sedimentary phase changes in the target layer. (2) The Saihan Formation is rich in reducing media such as organic matter (hydrocarbons, plant charcoal) and pyrite, meanwhile, it is also influenced by deep-seated hydrocarbon containing fluids. (3) Uranium minerals are mainly coffinite, closely associated with pyrite, ilmenite, calcite, organic matter, etc., besides, minerals such as zircon, thorium, monazite, and phosphorite have high uranium content, indicating that the uranium source supply distance is relatively close. Through comprehensive analysis of petrological and mineralogical characteristics, it is believed that the uranium mineralization of the Saihan Formation in the study area is the result of early sedimentary pre enrichment and later superimposed transformation enrichment. In the next step of the work, the stable sandstone thickness area and the escape area of hydrocarbon fluids can be identified as favorable ore-forming zones for exploration, which will provide theoretical basis for expanding the direction of uranium exploration in this region. |
| keywords:Saihan Formation petrology mineralogy uranium mineralization Sanggendalai sag |
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