CHARACTERISTICS OF SAND BODY AND URANIUM MOTALLOGENIC POTENTIAL IN SIFANGTAI FORMATION OF YI'AN SAG, NORTHERN SONGLIAO BASIN
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摘要:
根据钻探施工及取样分析结果，总结了松辽盆地北部依安凹陷内上白垩统四方台组沉积相、砂体发育及后生蚀变特征.依安凹陷内四方台组可分为上下两段，其中四方台组上段主要发育辫状河相沉积，下段主要为曲流河相沉积.辫状河相一般发育1~2层砂体，砂体规模较大，局部后生氧化作用发育.通过对依安凹陷四方台组铀源、构造、砂体发育及后生改造特征分析，认为其具有较好的砂岩型铀成矿所需的铀源条件、构造条件、砂体条件及后生氧化改造条件，铀矿找矿潜力较大.
Abstract:Based on the results of drilling and sampling analysis, the paper summarizes the characteristics of sedimentary facies, sand body development and epigenetic alteration of Upper Cretaceous Sifangtai Formation in Yi'an sag, northern Songliao Basin. The Sifangtai Formation can be divided into upper and lower members, with developed braided river facies sediments and meandering river facies sediments respectively. There are usually 1-2 layers of sand body developed in braided river facies, large in scale, with epigenetic oxidation locally. Through the analysis of uranium source, structure, sand body development and epigenetic transformation characteristics, it is considered that Sifangtai Formation has good conditions necessary for sandstone-type uranium mineralization, with great uranium prospecting potential.
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表 1 依安凹陷四方台组原生还原与后生氧化砂岩地球化学分析结果表
Table 1. Geochemical analysis results of primary reduced and epigenetic oxidized sandstones in Sifangtai Formation
样品类型 样品名称 有机碳/% 低价硫/% Fe3+/% Fe2+/% Fe3+/Fe2+ Th/U 原生还原 灰色细砂岩 0.022 0.0006 0.312 0.688 0.453 3.608 灰色细砂岩 0.015 0.0006 0.273 0.310 0.883 3.369 灰色中砂岩 0.026 0.0001 0.267 0.416 0.643 2.510 灰色细砂岩 0.026 0.0168 0.130 0.637 0.205 2.178 灰色中砂岩 0.022 0.0021 0.247 0.482 0.512 2.977 灰色中砂岩 0.022 0.0099 0.683 0.293 2.334 2.013 平均值 0.022 0.0050 0.320 0.470 0.840 2.780 后生氧化 浅黄色细砂岩 0.018 0.006 0.51 0.42 1.24 3.94 浅黄色泥质细砂岩 0.031 0.001 0.89 0.34 2.60 5.41 浅黄色含泥细砂岩 0.030 0.002 1.42 0.40 3.58 5.15 浅黄色含泥细砂岩 0.040 0.004 0.94 0.34 2.75 2.38 浅黄色含泥细砂岩 0.027 0.001 0.99 0.47 2.11 6.49 浅黄色细砂岩 0.036 0.003 1.67 0.35 4.76 4.37 浅黄色细砂岩 0.068 0.002 1.16 0.49 2.36 3.81 平均值 0.036 0.0030 1.08 0.40 2.77 4.51 分析测试单位：核工业东北分析测试中心. 
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