Two Geneses of Gray Sandstone and Their Uranium⁃Bearing Analysis of Lower Cretaceous Luohe Formation in Southwestern Ordos Basin
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摘要: 为了查明鄂尔多斯盆地西南部下白垩统洛河组灰色砂岩的成因，深化铀矿富集规律，定位砂岩型铀矿体产出部位，利用岩矿鉴定、XRD和元素地球化学分析等方法，对洛河组砂岩进行精细研究.结果显示研究区灰色砂岩有两种不同的成因：(1)洛河组下部砂岩具有典型的风成沉积特征，碎屑颗粒分选性和磨圆度较好，石英含量较高，粘土矿物总量较低，孔隙度大，具备较好的流体运移通道，经受后期还原流体的改造程度较高，为主要的富铀砂体；(2)洛河组上部砂岩为辫状河河道、河道边缘和泛滥盆地沉积，碎屑颗粒分选性和磨圆度中等‒较差，石英含量较低，粘土矿物总量较高，孔隙度低，经受还原改造程度较弱或基本未被改造.两种成因灰色砂岩元素地球化学特征总体一致，部分元素有所差异，在U含量富集部位，主量元素中CaO、P2O5和MnO含量升高，Fe2O3/FeO降低，风成灰色砂岩中δEu既有正异常又有负异常，δCe以负异常为主，河流沉积灰色砂岩中δEu和δCe均为负异常.研究得出，洛河组河流沉积砂岩以还原环境为主，为原生沉积砂岩，风成沉积砂岩则可能经受了由氧化向还原环境的转变，为蚀变改造砂岩.铀矿多产出于风成沉积的灰色砂岩中，U含量的增高伴随有P、Ca和ΣREE的相对富集，风成沉积灰色砂岩的生成以及铀矿的富集与烃类流体的蚀变作用紧密相关.Abstract: In order to find out the genesis of the gray sandstones of the Lower Cretaceous Luohe Formation in the southwestern Ordos basin, deepen the understanding of the law for uranium mineral enrichment, and locate the occurrence area of sandstone type uranium ore body, the gray sandstone of Luohe Formation is studied by means of rock and mineral identification, XRD analysis and element geochemical analysis. The results show that there are two different genetic types of gray sandstone in the study area. (1) The sandstone in the lower part of Luohe Formation has typical aeolian sedimentary characteristics, with good separation and roundness of clastic particles, high quartz content, low total clay minerals content, the inter-particle porosity is large, indicating that it has a better fluid migration channel, and it has undergone a higher degree of transformation by the later reducing fluid. Meanwhile, this type of sandstone is also the most important uranium rich sand body. (2) The sedimentary types of the upper part of Luohe Formation are mainly braided river channel, channel edge and flooding basin. with medium-poor separation and roundness of clastic particles, low quartz content, high total clay mineral content, the inter-particle porosity is slightly low, and the reduction transformation degree of sandstone is weak or even basically not transformed. The geochemical characteristics of the two genetic gray sandstones are generally consistent, and some elements are different. When the content of U is higher, the contents of Cao, P2O5 and MnO in the major elements increase obviously, while the ratio of Fe2O3/FeO decreases obviously.The δEu has both positive and negative anomalies and δCe shows mainly negative anomaly in the gray sandstone of aeolian deposition, while both δEu and δCe show negative anomalies in the gray sandstone of fluvial sedimentation. It is concluded that the fluvial sedimentary sandstone of the Luohe Formation is dominated by a reduction environment, which is primary sedimentary sandstone, while aeolian sedimentary sandstone may have undergone the transformation from oxidation to reduction environment, which is altered sandstone. Uranium ore bodies are mostly produced in gray sandstones of eolian deposits. The increase in U content is accompanied by the relative enrichment of P, Ca and ΣREE, the generation of aeolian sedimentary gray sandstone and the enrichment of uranium ore are closely related to the alteration of hydrocarbon fluids.
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Key words:
- gray sandstone /
- genetic type /
- uranium-bearing property /
- Luohe Formation /
- Pengyang uranium deposit /
- Ordos basin /
- mineral deposits
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图 1 鄂尔多斯盆地早白垩世宜君期‒洛河期盆地构造、岩相古地理简图(a)及研究区钻孔分布示意(b)
Fig. 1. The tectonic zoning and the lithofacies paleogeography for Yijun-Luohe Formation in the Early Cretaceous of the Ordos basin (a) and the borehole distribution diagram in the study area (b)
图 4 洛河组典型露头和岩心照片
a.露头区洛河组砂岩的大型高角度楔状交错层理(风成沉积砂岩)；b.露头区洛河组砂岩的板状交错层理(风成沉积砂岩)；c.露头区洛河组砂岩的波状交错层理，夹石膏薄层(河流沉积砂岩)；d.钻孔岩心中发育交错层理(风成沉积砂岩)；e.灰色砂岩中砂砾岩(河流沉积砂岩)；f.灰色细砂岩与褐色、灰色泥岩互层(河流沉积砂岩)；g.灰色泥岩中夹薄石膏层(沙漠湖沉积)；h.黄铁矿沿斜层理发育(风成沉积砂岩)；i：还原性流体沿裂隙贯入氧化砂岩，形成褪色蚀变(风成沉积砂岩)
Fig. 4. The typical photos of outcrops and core photographs in the Luohe Formation
图 5 鄂尔多斯盆地西南部洛河组NW-SE向岩性特征联井剖面
Fig. 5. The NW-SE well section of lithologic characteristics in the Luohe Formation, southwestern Ordos basin
图 6 洛河组风成沉积灰色砂岩与河流沉积灰色砂岩矿物成分和粘土矿物含量示意
a.洛河组风成沉积灰色砂岩与河流沉积灰色砂岩中矿物成分对比；b.洛河组风成沉积灰色砂岩与河流沉积灰色砂岩中粘土矿物含量对比
Fig. 6. The mineral composition and clay mineral content of the gray sandstone formed in the aeolian and fluvial depositional environment of the Luohe Formation
图 7 洛河组不同成因灰色砂岩微观岩石学特征
a.碎屑颗粒磨圆好，长石发生蚀变，表面生成粘土(蚀变灰色砂岩)；b.黑云母发生水解析出的铁质充填在解理缝中，使云母颗粒被浸染为红褐色(蚀变灰色砂岩)；c.亮晶方解石充填在碎屑颗粒孔隙间(蚀变灰色砂岩)；d.他形黄铁矿发育在碎屑颗粒间(蚀变灰色砂岩)；e.含矿砂岩附近较大量胶状黄铁矿充填在碎屑颗粒间(蚀变灰色砂岩)；f.河流成因的灰色砂岩附近泥质含量急增，碎屑颗粒粒径降低(原生灰色砂岩)；g.灰色砂岩孔隙内充填钙质胶结物，长石未发生蚀变(原生灰色砂岩)；h.灰色砂岩孔隙内充填钙质胶结物、泥质胶结物，长石未发生蚀变(原生灰色砂岩)；i.黑云母无黄铁矿浸染现象，未遭受明显蚀变(原生灰色砂岩)
Fig. 7. Micro petrological characteristics of gray sandstones of different origins in the Luohe Formation
图 8 Z17号钻孔洛河组中典型蚀变矿物和烃类流体含量垂向变化规律
Fig. 8. Vertical variations of typical altered mineral contents and hydrocarbon fluid contents in Luohe Formation of borehole Z17
图 9 Z17号钻孔洛河组灰色砂岩中主量元素垂向规律
Fig. 9. Vertical variations of major elements in gray sandstone of Luohe Formation in borehole Z17
图 10 洛河组砂岩微量元素球粒陨石标准化蛛网图(a)和稀土元素球粒陨石标准化配分模式(b)
a.标准化数据根据Sun and McDonough (1989)；b.据Boynton(1984)
Fig. 10. Chondrite-normalized trace element patterns (a) and chondrite-normalized REE diagrams (b) of sandstone in Luohe Formation
图 11 洛河组灰色砂岩样品粒度概率累积曲线
Fig. 11. Probability cumulative curves of grain size of gray sandstone from Luohe Formation
图 12 洛河组砂岩U含量与ΣREE、δCe、Eu相关性
Fig. 12. Correlation between U and ΣREE, δCe, Eu in the sandstone of Luohe Formation
图 13 鄂尔多斯盆地西南部洛河组铀矿体空间定位示意
Fig. 13. Schematic diagrams of spatial positioning for uranium ore bodies in Luohe Formation, southwestern Ordos basin
表 1 洛河组灰色砂岩中X衍射全岩分析结果
Table 1. Quantitative analysis of mineral components of gray sandstone in Luohe Formation by X-ray diffraction
岩石分类 样品编号 深度(m) 岩性 石英(%) 长石(%) 方解石(%) 白云石(%) 粘土矿物(%) 蚀变砂岩(风成沉积) Z17-n1 1 174 灰绿色细砂岩 74.8 13.2 5.8 0 6.2 Z17-n2 1 158.7 灰色细砂岩 72.3 16.8 0 0 10.9 Z17-n3 1 155.4 灰绿色细砂岩 73.3 14.9 3.1 0 8.7 Z17-n4 1 138.6 灰色细砂岩 72.8 14.1 3.3 0 9.8 Z17-n5 1 137.6 灰色细砂岩 67.9 19.2 4.8 0 8.1 Z17-n6 1 182 灰色细砂岩 63.2 16.6 8.2 0 12 Z17-n7 1 186.4 灰色细砂岩 64 18.3 12.1 0 5.6 Z17-n8 1 146.7 灰色细砂岩 60.2 19.4 11.4 0 9 Z17-n9 1 141.8 灰色细砂岩 68.4 19 6.7 0 5.9 Z17-n14 1 199 灰色中砂岩 70.9 12.6 0 5.5 11 Z13-n2 1 072 灰色钙质细砂岩 53.1 28 9.7 0 9.2 Z13-n3 1 084 灰色钙质细砂岩 67.5 13.5 9.3 0 9.7 Z13-n4 1 064.5 灰色钙质细砂岩 49 22 20.7 0 8.3 Z13-n5 1 036 灰色钙质细砂岩 64.7 8.8 18.4 0 8.1 Z13-n6 1 049.3 灰绿色中砂岩 79.6 9.7 0 0 10.7 Z13-n7 1 090.47 灰绿色细砂岩 65.5 26.6 5.1 0 2.8 平均值 66.70 17.04 7.41 0.34 8.50 原生砂岩(河流沉积) Z13-n8 1 009.5 灰色细砂岩 40.4 12.3 0 5.8 41.5 Z17-n10 930 灰色细砂岩 52.7 20.1 3.6 11.2 12.4 Z17-n11 892 灰色细砂岩 32.5 14.9 0 17.4 35.2 Z13-n10 800 灰色粉砂岩 31.7 11.8 0 11.4 45.1 平均值 39.33 14.78 0.90 11.45 33.55 
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表 2 洛河组灰色砂岩中X衍射粘土矿物定量分析结果
Table 2. Quantitative analysis of clay mineral components of gray sandstone in Luohe Formation by X-ray diffraction
岩石分类 序号 样品编号 深度(m) 岩性 粘土占比(%) S(%) I/S(%) It(%) Kao(%) C(%) 灰色钙质砂岩(风成沉积) 1 Z13-n2 1 072 灰色钙质细砂岩 9.20 0.00 79.00 8.00 7.00 6.00 2 Z13-n3 1 084 灰色钙质细砂岩 9.70 0.00 82.00 13.00 2.00 3.00 3 Z13-n4 1 064.5 灰色钙质细砂岩 8.30 0.00 53.00 23.00 24.00 0.00 4 Z13-n5 1 036 灰色钙质细砂岩 8.10 0.00 55.00 5.00 4.00 3.00 平均值 8.83 0.00 67.25 12.25 9.25 3.00 灰色砂岩(风成沉积) 5 Z17-n1 1 174 灰绿色细砂岩 6.20 0.00 45.00 13.00 42.00 0.00 6 Z17-n2 1 158.7 灰色细砂岩 10.90 0.00 30.00 17.00 41.00 12.00 7 Z17-n3 1 155.4 灰绿色细砂岩 8.70 0.00 42.00 14.00 34.00 10.00 8 Z17-n4 1 138.6 灰色细砂岩 9.80 0.00 35.00 22.00 36.00 7.00 9 Z17-n5 1 137.6 灰色细砂岩 8.10 0.00 36.00 31.00 33.00 0.00 10 Z17-n6 1 182 灰色细砂岩 12.00 0.00 45.00 21.00 28.00 6.00 11 Z17-n7 1 186.4 灰色细砂岩 5.60 0.00 75.00 13.00 8.00 4.00 12 Z17-n8 1 146.7 灰色细砂岩 9.00 0.00 29.00 32.00 30.00 9.00 13 Z17-n9 1 141.8 灰色细砂岩 5.90 0.00 38.00 18.00 32.00 12.00 14 Z13-n6 1 049.3 灰绿色中砂岩 10.70 0.00 53.00 27.00 20.00 0.00 15 Z13-n7 1 090.47 灰绿色细砂岩 2.80 0.00 32.00 18.00 50.00 0.00 平均值 8.15 0.00 41.82 20.55 32.18 5.45 灰色砂岩(河流沉积) 16 Z17-n10 930 灰色细砂岩 12.40 0.00 62.00 31.00 0.00 7.00 17 Z13-n8 1 009.5 灰色钙质细砂岩 41.50 0.00 72.00 22.00 4.00 2.00 18 Z13-n9 606 灰色细砂岩 26.80 0.00 57.00 38.00 2.00 3.00 19 Z17-n11 892 灰色细砂岩 35.20 0.00 50.00 41.00 0.00 9.00 20 Z13-n10 800 灰色粉砂岩 45.10 0.00 69.00 28.00 0.00 3.00 平均值 32.20 0.00 62.00 32.00 1.20 4.80 泥岩 21 Z13-n11 797.3 灰色泥岩 78.40 0.00 54.00 38.00 3.00 5.00 22 Z13-n12 1 003 灰色泥岩 51.60 0.00 59.00 22.00 11.00 8.00 23 Z17-n12 1 038.5 红色泥岩 55.20 0.00 51.00 40.00 2.00 7.00 24 Z17-n13 978.9 红色泥岩 67.10 0.00 64.00 26.00 5.00 5.00 平均值 63.08 0.00 57.00 31.50 5.25 6.25 注：S.蒙皂石；I/S.伊蒙混层；It.伊利石；Kao.高岭石；C.绿泥石.
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表 3 Z17号钻孔洛河组灰色砂岩中主量元素含量统计表
Table 3. Statistics of major element contents in gray sandstone of Luohe Formation in borehole Z17
类型 样品编号 岩性 深度(m) SiO2(%) Al2O3(%) Fe2O3(%) FeO(%) Fe2O3/FeO CaO(%) MgO(%) K2O(%) Na2O(%) TiO2(%) P2O5(%) MnO(%) U(10-6) Th(10-6) Th/U 风成沉积砂岩(围岩) Z17-p4 灰绿色细砂岩 1 174 84.53 4.71 0.42 0.44 0.95 3.24 0.46 1.88 1.03 0.13 0.031 0.028 1.81 4.68 2.59 Z17-p5 灰色细砂岩 1 158.7 84.49 6.4 0.52 0.37 1.41 1.72 0.44 2.36 1.47 0.16 0.038 0.009 4.79 2.77 0.58 Z17-p6 灰绿色细砂岩 1 155.4 82.72 6.58 0.7 0.42 1.67 2.37 0.47 2.36 1.56 0.19 0.036 0.015 3.88 3.41 0.88 Z17-p10 灰色细砂岩 1 137.6 83.56 5.86 0.57 0.25 2.28 2.68 0.42 2.3 1.33 0.13 0.16 0.022 12.8 10.5 0.82 平均值 83.83 5.89 0.55 0.37 1.58 2.50 0.45 2.23 1.35 0.15 0.07 0.02 5.82 5.34 1.22 风成沉积砂岩(含矿) Z17-p1 灰色中砂岩 1 199 82.23 4.87 0.26 0.55 0.47 3.19 1.34 1.97 1.04 0.12 0.18 0.028 21.9 3.3 0.15 Z17-p3 灰色细砂岩 1 182 71.24 5.92 0.25 0.62 0.40 9.53 0.45 2.15 1.44 0.19 0.26 0.046 27.4 22.2 0.81 Z17-p2 灰色细砂岩 1 186.4 75.09 5.11 0.29 0.39 0.74 8.25 0.39 1.99 1.21 0.14 0.35 0.025 37.2 3.93 0.11 Z17-p7 灰色细砂岩 1 146.7 82.97 6.53 0.34 0.59 0.58 2.44 0.42 2.35 1.52 0.17 0.051 0.016 241 4.65 0.02 Z17-p8 灰色细砂岩 1 141.8 81.03 5.93 0.29 0.61 0.48 4.06 0.42 2.22 1.4 0.15 0.16 0.027 1110 14.3 0.01 平均值 78.51 5.67 0.29 0.55 0.53 5.49 0.60 2.14 1.32 0.15 0.20 0.03 287.50 9.68 0.22 河流沉积砂岩 Z17-p16 灰色钙质细砂岩 1 002.2 69.86 4.1 0.24 0.36 0.67 10.35 1.84 1.64 0.92 0.14 0.13 0.024 7 7.26 1.04 Z17-p22 灰色细砂岩 930 68.98 8.58 1.65 0.88 1.88 5.7 1.8 2.82 2.09 0.45 0.12 0.055 1.64 7.91 4.82 Z17-p25 灰色细砂岩 890 77.21 7.89 0.72 0.61 1.18 4.02 0.69 2.38 2.09 0.26 0.059 0.033 1.59 4.77 3.00 平均值 72.02 6.86 0.87 0.62 1.24 6.69 1.44 2.28 1.70 0.28 0.10 0.04 3.41 6.65 2.95
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表 4 Z17号钻孔洛河组灰色砂岩中微量元素含量统计表
Table 4. Statistics of trace element content in gray sandstone of Luohe Formation in borehole Z17
类型 样品编号 Rb(10-6) K(10-2) Ba(10-6) Th(10-6) U(10-6) Nb(10-6) La(10-6) Ce(10-6) Sr(10-6) Nd(10-6) P(10-2) Zr(10-6) Hf(10-6) Sm(10-6) Ti(10-2) Y(10-6) Yb(10-6) Lu(10-6) Ta(10-6) 风成沉积砂岩(围岩) Z17-p4 60.1 1.88 475 4.68 1.81 2.14 10.8 20.2 139 8.94 0.03 66 2.08 1.56 0.13 4.85 0.54 0.09 0.21 Z17-p5 72.6 2.36 502 2.77 4.79 3 7.25 13.3 144 5.77 0.04 73.2 2.22 1.04 0.16 4.62 0.57 0.091 0.27 Z17-p6 75.2 2.36 550 3.41 3.88 3.65 13.2 23.1 164 9.02 0.04 127 3.5 1.46 0.19 5.26 0.62 0.1 0.32 Z17-p10 74.7 2.3 480 10.5 12.8 2.37 13.7 29.7 202 15.9 0.16 57.9 1.78 2.97 0.13 9.68 0.91 0.13 0.21 风成沉积砂岩(含矿) Z17-p1 63.6 1.97 527 3.3 21.9 2.09 9.49 17.7 199 8.07 0.18 55.6 1.65 1.46 0.12 6.06 0.87 0.15 0.19 Z17-p2 64.6 1.99 482 3.93 37.2 2.53 12.3 23.3 355 10 0.35 63.3 1.91 1.74 0.14 7.62 1.17 0.18 0.22 Z17-p3 70.6 2.15 497 22.2 27.4 3.19 13 24.5 423 11.4 0.26 84.6 2.48 2.31 0.19 16.9 1.95 0.29 0.29 Z17-p7 74.1 2.35 538 4.65 241 3.3 15.1 27.3 134 10.8 0.05 85.7 2.54 1.82 0.17 6 0.66 0.1 0.29 Z17-p8 72 2.22 572 14.3 1110 2.64 21.1 43.5 217 18.3 0.16 61.1 1.86 3.62 0.15 15.4 1.15 0.15 0.24 河流沉积砂岩 Z17-p16 54.8 1.64 366 7.26 7 2.26 11.2 21.8 228 10.6 0.13 83.9 2.34 1.88 0.14 9.96 0.86 0.13 0.2 Z17-p22 90.4 2.82 516 7.91 1.64 7.79 27.1 50.9 227 23.1 0.12 241 6.77 4.22 0.45 17.7 1.91 0.3 0.66 Z17-p25 79.6 2.38 445 4.77 1.59 4.48 16.7 31 213 14 0.06 97.1 2.91 2.53 0.26 10.9 1.21 0.19 0.38
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表 5 Z17号钻孔洛河组灰色砂岩中稀土元素含量统计
Table 5. Statistics of rare earth element contents in gray sandstone of Luohe Formation in borehole Z17
类型 样品编号 La(10-6) Ce(10-6) Pr(10-6) Nd(10-6) Sm(10-6) Eu(10-6) Gd(10-6) Tb(10-6) Dy(10-6) Ho(10-6) Er(10-6) Tm(10-6) Yb(10-6) Lu(10-6) Y(10-6) ΣREE LREE HREE δEu δCe 风成沉积砂岩(围岩) Z17-p4 10.8 20.2 2.44 8.94 1.56 0.49 1.47 0.2 1.01 0.19 0.57 0.085 0.54 0.09 4.85 48.59 44.43 4.16 0.99 0.95 Z17-p5 7.25 13.3 1.58 5.77 1.04 0.43 1.01 0.16 0.94 0.18 0.55 0.085 0.57 0.091 4.62 32.956 29.37 3.59 1.28 0.95 Z17-p6 13.2 23.1 2.59 9.02 1.46 0.5 1.46 0.2 1.01 0.2 0.58 0.092 0.62 0.1 5.26 54.132 49.87 4.26 1.05 0.95 Z17-p10 13.7 29.7 4.02 15.9 2.97 0.74 2.55 0.39 2.11 0.36 1.05 0.15 0.91 0.13 9.68 74.68 67.03 7.65 0.82 0.96 风成沉积砂岩(含矿) Z17-p1 9.49 17.7 2.15 8.07 1.46 0.49 1.45 0.21 1.21 0.22 0.69 0.11 0.87 0.15 6.06 44.27 39.36 4.91 1.03 0.94 Z17-p2 12.3 23.3 2.71 10 1.74 0.51 1.81 0.26 1.43 0.29 0.9 0.17 1.17 0.18 7.62 56.77 50.56 6.21 0.88 0.97 Z17-p3 13 24.5 3 11.4 2.31 0.67 2.43 0.45 3.03 0.65 1.95 0.31 1.95 0.29 16.9 65.94 54.88 11.06 0.86 0.94 Z17-p7 15.1 27.3 3.07 10.8 1.82 0.57 1.79 0.24 1.26 0.23 0.68 0.1 0.66 0.1 6 63.72 58.66 5.06 0.97 0.97 Z17-p8 21.1 43.5 4.88 18.3 3.62 0.89 3.31 0.54 3.02 0.58 1.66 0.21 1.15 0.15 15.4 102.91 92.29 10.62 0.786 1.03 河流沉积砂岩 Z17-p16 11.2 21.8 2.81 10.6 1.88 0.48 1.86 0.3 1.77 0.36 1 0.14 0.86 0.13 9.96 55.19 48.77 6.42 0.78 0.94 Z17-p22 27.1 50.9 6.14 23.1 4.22 0.93 3.92 0.6 3.32 0.66 1.95 0.29 1.91 0.3 17.7 125.34 112.39 12.95 0.70 0.95 Z17-p25 16.7 31 3.77 14 2.53 0.66 2.37 0.36 2.01 0.4 1.2 0.19 1.21 0.19 10.9 76.59 68.66 7.93 0.82 0.94
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表 6 风成沉积与河流沉积灰色砂岩主要特征综合对比表
Table 6. Comprehensive comparison for the main characteristics of aeolian and fluvial gray sandstones
灰色砂岩成因 河流沉积 风成沉积 空间分布特征 原生灰色砂岩呈透镜状或舌状产出于红色、黄色砂岩内部，泥质含量明显升高 灰色蚀变砂岩与红色或黄色氧化砂岩水平接触部位呈较明显的穿层现象，垂向上氧化砂岩与灰色砂岩的接触边界受粒度和渗透性控制明显 结构特征 大小 砾岩、砂砾岩、粗砂岩、中砂岩、细砂岩 中砂岩、细砂岩为主 形状 次棱角状 次圆状 分选 分选性中等 分选性好 成分特征 石英平均含量为39.33%，粘土矿物平均含量为33.55% 石英平均含量为66.70%，粘土矿物平均含量为8.5% 构造特征 水平层理、波状层理 大型楔状、板状交错层理 粘土矿物特征 伊/蒙混层矿物含量高，绿泥石含量较低，高岭石含量极低 伊/蒙混层矿物含量较高，泥质胶结的灰色砂岩中高岭石含量较高，钙质胶结的灰色砂岩中高岭石和伊利石均较低 主量元素特征 SiO2和P2O5含量较低，CaO、MgO和MnO含量较高 SiO2含量较高，随着U含量升高，CaO、P2O5和MnO含量明显升高，Fe2O3/FeO明显降低 微量、稀土元素特征 Ce为负异常 Ce为负异常，δCe值随U含量增高而明显增大.Eu的亏损程度要明显小于河流沉积灰色砂岩 粒度特征 粒度概率累积曲线斜率较低，显示粒径变化范围更大.河道边缘中的细砂岩以跳跃组分为主体，辫状河道中的砂砾岩概率累积曲线以滚动组分和跳跃组分为主体，悬浮组分较低 以跳跃组分为主体，伴随有少量悬浮组分 蚀变现象 不明显 可见规模不等的沿裂隙切层或顺层发育的还原性流体蚀变现象，具有明显的对称蚀变分带，从中心向外围依次为绿灰色‒黄色/浅红色‒红色砂岩，并且见到较明显的油浸、油斑、油迹等现象，显微镜下荧光现象也比较常见 岩石颜色成因 原生沉积色为主 后生蚀变色为主 矿体形态 / 板状 主要的富铀砂体 否 是
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