| 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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| 关键词:Saihan Formation petrology mineralogy uranium mineralization Sanggendalai sag |
| 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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| 摘要: |
| Petrological and Mineralogical Characteristics of the Saihan Formation in the Sanggendalai Sag of the Erlian Basin and Their Indications for Uranium Enrichment |
| 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. |
| ZHU Qiang,SI Qinghong,WEN Sibo,YU Reng’an,LI Guangyao,ZHANG Bo,WANG Shanbo,PENG Shenglong,LI Jianmin.2026.Petrological and Mineralogical Characteristics of the Saihan Formation in the Sanggendalai Sag of the Erlian Basin and Their Indications for Uranium Enrichment[J].Acta Geoscientica Sinica,47(4):805-819. |
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