Diagenesis of Sand-Mudstone from Qingshankou Formation and Their Uranium Mineralization in DL Deposit, Southwestern Songliao Basin
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摘要: 为查明松辽盆地西南部DL铀矿床青山口组红杂色层砂-泥岩协同成岩作用及其铀成矿效应，系统开展了不同颜色岩石的岩石、矿物、元素及同位素特征研究.结果表明，砂、泥岩具有相似的碎屑物组成、黏土矿物组合以及主微量元素含量或比值，反映了统一的物源和构造-沉积环境；地层正常的最大埋藏演化达到了中成岩A阶段的早期.砂岩经历了酸碱交替成岩成矿作用演化，沉积-埋藏成岩期普遍发育方解石化、白云石化、菱铁矿化、伊蒙混层化、黄（白）铁矿化、高岭石化及局部（褐）赤铁矿化和铀矿化；古近纪期间深部基性岩浆侵入衍生的碱性热流体使得砂岩发生了（高锰）铁白云石化、绿泥石化、硅化、砷铅矿化以及早期铀矿的叠加改造；表生成岩阶段发育了强烈的（褐）赤铁矿化及其伴生的铀矿体.其中，红色砂岩既有原生同沉积型，也存在后生氧化成因；灰色砂岩为原生弱还原性砂岩叠加了深部流体次生还原后的氧化残留体.所有泥岩表现为碱性成岩作用，黏土矿物以伊蒙混层和伊利石为主；主要发育（褐）赤铁矿化、方解石化、白云石化、伊蒙混层化，且灰色泥岩局部发育黄铁矿化和铀矿化.同一钻孔相邻砂、泥岩在黏土矿物、Ca、Mg、Fe、Mo、U等活动性元素及碳同位素组成方面存在相似的变化规律，指示了原生不同地球化学性质岩石之间在沉积-埋藏成岩阶段短距离发生了一定的物质迁移和流体交换.目的层总体具有青山口-嫩江期同沉积-成岩预富集和潜水氧化初始成矿以及嫩江末以来多元流体耦合叠加层间氧化主成矿的两阶段板状铀成矿过程.Abstract: The synergistic diagenesis of the sand-mudstone from the Qingshankou Formation and their uranium metallogenic significance were systematically researched through investigating the petro-mineralogy, major and trace elements, carbon and oxygen isotopes of various rocks with different colors. Results show that both sandstone and mudstone have similar clastic mineral composition, clay mineral assemblage and the major and trace element contents, reflecting the unified provenance and the same tectonic-sedimentary environment. The maximum burial evolution of the target strata probably reached the early stage-A of the middle diagenesis. The sandstone has undergone the acid-alkaline alternating diagenetic evolution. During burial diagenesis stage, it has widely developed the calcitization, dolomitization, sideritization, semctite-illitization, pyritization, kaolinization and local limonitization, hematitization and uranium mineralization. Also, the alkaline hydrothermal fluid derived from the intrusion of deep basic magma in Paleogene period, led to the occurrence of high manganese ankerite, chloritization, silicification, mimetite and the superimposed reformation of the early uranium ores. Then, the sand body developed strong limonitization, hematitization and associated uranium mineralization in the epigenetic stage. Thus, these conclusions could be draw, i.e. the red sandstone mainly formed by epigenetic oxidation, and a few from primary syn-sedimentary. Present residual grey sandstone, characterized by intense reduced capability, was secondary reduced by the deep fluid. The mudstone is characterized by alkaline diagenesis with the respects of the much aboundance of smectite mixed layer and illite, and the extensive development of the limonitization, hematitization, calcitization, dolomitization and semctite-illitization. Moreover, little pyritization and uranium mineralization were locally occurred within grey mudstone. The similar changing rules in terms of clay minerals, the movable element of Ca, Mg, Fe, Mo, U and the carbon isotopic compositions exist both in the sandstone and adjacent mudstone from the same borehole, which indicates that aboundant materials and fluids migrated and exchanged between various rocks with different geochemical properties in sedimentary-burial diagenetic stage. The two-stage ore-forming process of the tabular-shaped uranium deposit was proposed for the target bed of the Qingshankou Formation, i.e. (1) synsedimentary-diagenetic preconcentration and phreatic oxidation uranium initial mineralization from the Qingshankou to the Nenjiang period, (2) main coupling interlayer oxidation uranium mineralization superimposed by deep fluid since the end of Nenjiang era.
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图 2 DL铀矿床青山口组砂-泥岩样品位置及岩心宏观照片
Fig. 2. Location of samples and photographs of rock cores of the Qingshankou Formation from DL uranium deposit
图 3 DL铀矿床青山口组砂-泥岩镜下微观照片
Zr.锆石；Ms.白云母；Kfs.钾长石；Dol.白云石；De.岩屑；Q.石英；Lm-Hem.褐铁矿化和赤铁矿化；C.碳屑；Cal.方解石；Ank.铁白云石；Mn-Ank.高锰铁白云石；Py.黄铁矿
Fig. 3. Microscopic photographs and energy spectrum of sandstone and mudstone from the Qingshankou Formation of DL uranium deposit
图 4 DL铀矿床青山口组砂-泥岩黏土矿物及碳、氧同位素纵向分布
Fig. 4. Vertical distribution of clay minerals and carbon and oxygen isotopes for the sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
图 5 DL铀矿床青山口组砂-泥岩黏土及自生矿物微观照片
Q.石英；Ab.钠长石；Kln.高岭石；S/I.伊蒙混层；Ilm.伊利石；Kfs-Sm.钾长石蒙脱石化；Fe-Chl.铁绿泥石；Ank.铁白云石；Chl.绿泥石；Dol.白云石；Mrc.白铁矿；Py.黄铁矿；U+Ti+Si.含铀、钛、硅混合物；Se-Pb.砷铅矿；U.铀矿物
Fig. 5. Micrographs of clay and authigenic minerals of sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
图 6 DL铀矿床青山口组砂-泥岩主量元素相关关系
底图a据胡妍等（2020）；判别函数1=-1.773TiO2+0.607Al2O3+0.76TFe2O3-1.5MgO+0.616CaO+0.509Na2O-1.224K2O-9.09；判别函数2=0.445TiO2+0.07Al2O3-0.25TFe2O3-1.142MgO+0.438CaO+1.475Na2O+1.426K2O-6.861
Fig. 6. Correlation of major elements for sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
图 7 DL铀矿床青山口组砂-泥岩部分元素含量及比值纵向分布
Fig. 7. Vertical distribution of some element contents and ratios for sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
图 8 DL铀矿床青山口组砂-泥岩稀土元素配分图
Fig. 8. Cobweb diagram of REE distribution for sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
图 9 DL铀矿床青山口组砂-泥岩碳酸盐胶结物C-O同位素分布图(b底图据刘建明等，1997)
Fig. 9. Carbon and oxygen isotopic distribution of carbonate cements from sandstone and mudstone of the Qingshankou Formation in DL uranium deposit (background map b from Liu et al., 1997)
图 10 DL铀矿床青山口组砂-泥岩协同成岩成矿演化序列
Fig. 10. Evolution sequence of synergetic diagenesis and uranium mineralization for sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
图 11 DL铀矿床青山口组砂-泥岩协同成岩成矿作用模型
Fig. 11. Model of synergetic diagenesis and uranium mineralization for sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
表 1 DL铀矿床青山口组砂-泥岩X衍射分析结果(%)
Table 1. X-ray diffraction results for sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
类型 样号 伊蒙混层 伊利石 高岭石 绿泥石 混层比 石英 钾长石 斜长石 方解石 白云石 赤铁矿 黏土矿物 红色泥岩 XT19-01 37.00 38.00 21.00 4.00 16.00 42.00 4.00 15.80 / / 3.30 34.90 XT19-03 84.00 13.00 3.00 / 67.00 / / / / / / / XT19-10 13.00 25.00 59.00 3.00 19.00 28.50 5.00 14.20 8.80 / / 43.50 XT19-12 45.00 35.00 16.00 4.00 5.00 36.00 3.80 12.90 / / 3.60 43.70 XT19-16 36.00 40.00 19.00 5.00 20.00 44.60 4.40 9.90 / / 2.10 39.00 XT19-20 38.00 26.00 33.00 3.00 16.00 53.90 4.70 / / / / 41.40 XT19-27 55.00 35.00 8.00 2.00 40.00 36.40 5.90 14.40 / 8.20 / 35.10 XT19-29 47.00 45.00 5.00 3.00 40.00 32.70 2.60 12.00 11.70 5.20 1.10 34.70 平均值 44.38 32.13 20.50 3.43 27.88 39.16 4.34 13.20 10.25 6.70 2.53 38.90 灰色泥岩 XT19-14 37.00 28.00 28.00 7.00 17.00 39.00 3.40 8.20 / / / 49.40 XT19-17 31.00 36.00 29.00 4.00 20.00 XT19-23 32.00 25.00 39.00 4.00 17.00 50.80 3.70 / / / / 45.50 平均值 33.33 29.67 32.00 5.00 18.00 44.90 3.55 8.20 47.45 红色砂岩 XT19-14 27.00 24.00 44.00 5.00 8.00 58.10 13.90 13.90 / 5.60 / 8.50 XT19-04 18.00 23.00 56.00 3.00 5.00 55.50 9.60 7.50 / 12.20 / 15.20 XT19-05 48.00 19.00 30.00 3.00 18.00 49.80 3.60 8.50 / / / 38.10 XT19-09 21.00 7.00 69.00 3.00 5.00 65.50 7.30 / / 5.90 / 21.30 XT19-11 43.00 20.00 32.00 5.00 49.00 35.70 24.70 19.30 / 11.20 / 9.10 XT19-13 27.00 20.00 48.00 5.00 5.00 42.70 10.30 18.00 / 25.40 / 3.60 XT19-15 33.00 15.00 48.00 4.00 6.00 46.90 13.70 14.30 / 15.30 / 9.80 XT19-19 20.00 19.00 58.00 3.00 15.00 60.50 7.00 11.30 / 6.90 / 14.30 XT19-25 24.00 22.00 51.00 3.00 16.00 30.40 4.80 6.50 / 43.90 4.10 10.30 XT19-26 27.00 16.00 53.00 4.00 25.00 64.70 6.70 5.70 / 5.40 3.10 14.40 XT19-28 62.00 25.00 10.00 3.00 40.00 41.80 8.70 14.40 3.50 13.40 / 18.20 XT19-30 51.00 14.00 30.00 5.00 55.00 39.80 14.50 20.00 7.00 8.70 / 10.00 平均值 33.42 18.67 44.08 3.83 20.58 49.28 10.40 12.67 5.25 13.99 3.60 14.40 灰色砂岩 XT19-14 9.00 17.00 71.00 3.00 5.00 49.20 17.10 7.90 / 10.60 / 15.20 XT19-07 17.00 15.00 64.00 4.00 5.00 46.90 22.30 6.90 / 6.70 / 17.20 XT19-08 10.00 17.00 69.00 4.00 5.00 63.80 12.10 10.90 / 3.50 / 9.70 XT19-18 14.00 15.00 66.00 5.00 5.00 62.30 8.30 12.10 / 5.10 / 12.20 XT19-21 26.00 25.00 47.00 2.00 19.00 53.70 9.40 8.10 / 4.40 / 24.40 XT19-22 15.00 16.00 67.00 2.00 5.00 53.50 12.50 8.30 / 12.60 / 13.10 XT19-24 16.00 16.00 66.00 2.00 5.00 63.40 8.70 2.80 / 8.90 / 16.20 平均值 15.29 17.29 64.29 3.14 7.00 56.11 12.91 8.14 7.40 15.43 注：测试结果中的白云石为铁白云石或白云石，X衍射结果未区分. 
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表 2 DL铀矿床青山口组砂-泥岩主要元素含量表(%)
Table 2. Major element contents for sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
类型 样号 SiO2 Al2O3 TFe2O3 MgO CaO Na2O K2O MnO TiO2 P2O5 FeO Fe3+/Fe2+ Nb/Ta Zr/Hf Al2O3/Zr K2O/Zr CaO/Zr MgO/Zr CIA 红色泥岩 XT19-01 66.71 15.80 5.77 0.79 0.33 1.89 3.67 0.02 0.79 0.20 0.53 7.91 13.33 32.63 0.08 0.02 0.00 0.00 66.92 XT19-03 58.61 13.42 3.79 2.27 5.56 2.36 2.39 0.11 0.57 0.13 0.48 5.52 14.30 30.50 0.12 0.02 0.05 0.02 44.07 XT19-10 76.18 10.89 3.20 0.46 0.76 0.85 3.38 0.03 0.33 0.07 1.04 1.66 13.71 31.44 0.08 0.03 0.01 0.00 128.38 XT19-12 63.59 16.61 6.58 1.01 0.45 1.80 3.83 0.02 0.79 0.23 0.49 9.94 14.03 33.28 0.07 0.02 0.00 0.00 67.59 XT19-16 67.99 15.95 4.64 0.64 0.27 1.72 3.71 0.02 0.80 0.16 0.45 7.45 13.97 33.49 0.08 0.02 0.00 0.00 67.98 XT19-20 68.37 16.17 4.86 0.54 0.24 0.36 3.15 0.02 0.81 0.22 0.86 3.72 14.46 34.58 0.07 0.01 0.00 0.00 79.97 XT19-27 65.85 14.36 4.52 1.36 1.57 2.24 3.38 0.03 0.71 0.17 0.40 8.24 14.92 33.88 0.09 0.02 0.01 0.01 63.50 XT19-29 61.36 12.85 3.29 1.21 5.91 2.02 3.20 0.11 0.54 0.13 0.41 5.62 14.33 33.68 0.10 0.02 0.05 0.01 74.00 平均值 66.08 14.51 4.58 1.04 1.89 1.66 3.34 0.05 0.66 0.16 0.58 6.26 14.13 32.94 0.09 0.02 0.01 0.01 74.05 灰色泥岩 XT19-14 66.46 17.90 2.84 0.68 0.26 1.59 3.74 0.02 0.75 0.14 0.80 2.04 13.40 33.55 0.09 0.02 0.00 0.00 71.00 XT19-17 68.43 18.03 1.56 0.52 0.25 1.41 3.56 0.01 0.83 0.15 0.67 1.06 13.82 34.73 0.07 0.01 0.00 0.00 72.82 XT19-23 68.36 17.34 2.03 0.48 0.26 0.54 3.19 0.02 0.82 0.22 1.43 0.34 14.07 33.48 0.08 0.01 0.00 0.00 79.57 平均值 67.75 17.76 2.14 0.56 0.26 1.18 3.50 0.01 0.80 0.17 0.97 1.15 13.76 33.92 0.08 0.02 0.00 0.00 74.46 红色砂岩 XT19-02 80.10 9.55 1.23 0.51 0.87 1.74 3.15 0.02 0.26 0.06 0.51 1.13 12.56 31.28 0.09 0.03 0.01 0.00 58.69 XT19-04 73.08 11.42 2.16 0.99 2.07 0.85 3.34 0.09 0.36 0.07 0.84 1.26 12.59 30.47 0.09 0.03 0.02 0.01 67.50 XT19-05 69.60 16.21 3.25 0.56 0.21 1.10 3.53 0.02 0.77 0.11 0.35 6.63 13.26 32.74 0.08 0.02 0.00 0.00 72.65 XT19-09 78.38 10.58 2.14 0.59 0.97 0.22 2.90 0.04 0.37 0.09 0.36 3.96 13.81 32.70 0.08 0.02 0.01 0.00 75.11 XT19-11 73.26 11.08 1.73 1.23 2.14 2.36 3.44 0.03 0.33 0.07 0.53 1.81 12.38 31.35 0.11 0.03 0.02 0.01 55.24 XT19-13 68.25 8.97 1.47 2.75 4.98 1.75 2.88 0.06 0.22 0.06 0.78 0.71 12.62 32.90 0.11 0.04 0.06 0.03 51.51 XT19-15 74.16 10.28 1.79 1.04 2.12 1.68 3.16 0.06 0.37 0.06 1.14 0.46 12.67 32.02 0.08 0.03 0.02 0.01 62.39 XT19-19 79.62 10.44 1.47 0.31 0.61 1.17 3.34 0.06 0.28 0.09 0.40 2.14 12.73 32.14 0.08 0.02 0.00 0.00 68.05 XT19-25 58.14 8.47 6.85 2.92 7.04 0.73 2.44 0.27 0.45 0.09 2.78 1.17 14.18 33.78 0.07 0.02 0.06 0.02 65.27 XT19-26 77.06 10.71 3.21 0.43 0.71 0.56 3.15 0.04 0.34 0.10 0.90 2.05 14.03 33.66 0.08 0.02 0.01 0.00 72.43 XT19-28 64.56 11.64 2.78 2.05 4.42 2.25 3.15 0.09 0.44 0.12 0.33 5.94 13.99 32.68 0.10 0.03 0.04 0.02 58.33 XT19-30 65.48 12.22 2.33 1.32 5.01 2.65 2.78 0.08 0.48 0.13 0.25 6.66 14.60 33.14 0.14 0.03 0.06 0.02 62.01 平均值 71.81 10.96 2.53 1.22 2.60 1.42 3.11 0.07 0.39 0.09 0.76 2.83 13.28 32.41 0.09 0.03 0.02 0.01 64.10 灰色砂岩 XT19-06 76.19 10.46 1.81 0.80 1.56 0.81 3.25 0.04 0.28 0.06 1.30 0.31 12.63 30.87 0.09 0.03 0.01 0.01 68.24 XT19-07 76.54 12.25 1.56 0.40 0.54 0.61 3.54 0.05 0.45 0.10 1.17 0.27 13.32 32.04 0.10 0.03 0.00 0.00 75.71 XT19-08 81.46 10.21 0.78 0.20 0.31 0.81 3.17 0.01 0.34 0.09 0.56 0.32 13.18 31.28 0.09 0.03 0.00 0.00 69.85 XT19-18 81.74 9.67 0.58 0.29 0.67 1.26 2.99 0.04 0.30 0.12 0.35 0.53 12.92 32.33 0.08 0.03 0.01 0.00 64.82 XT19-21 73.59 12.98 2.66 0.60 0.74 0.65 3.11 0.04 0.62 0.13 1.48 0.64 13.33 31.79 0.08 0.02 0.00 0.00 74.40 XT19-22 75.53 10.67 2.04 0.72 1.52 1.12 3.15 0.06 0.35 0.08 1.68 0.17 13.03 32.26 0.10 0.03 0.01 0.01 69.44 XT19-24 76.43 10.15 2.89 0.65 1.07 0.36 3.07 0.04 0.32 0.10 1.96 0.38 12.53 31.49 0.07 0.02 0.01 0.00 75.60 平均值 77.35 10.91 1.76 0.52 0.92 0.80 3.18 0.04 0.38 0.10 1.21 0.37 12.99 31.72 0.09 0.03 0.01 0.00 71.15 注：CaO*=CaO-CO2(方解石)-0.5CO2(白云石)-10/3P2O5；CIA=[Al2O3/(Al2O3+CaO*+Na2O+K2O)]×100%；氧化物含量均为摩尔含量，CaO*为硅酸盐中的CaO摩尔含量，方解石和白云石通过全岩X射线衍射获得；公式参考胡妍等(2020).
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表 3 DL铀矿床青山口组砂-泥岩稀土元素含量(10-6)及比值
Table 3. Contents and ratios of rare earth elements for sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
类型 样号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu ΣREE LREE HREE L/H (La/Yb)N δEu δCe 红色泥岩 XT19-01 49.90 101.00 11.80 45.70 8.80 1.66 8.55 1.40 7.16 1.30 3.67 0.51 3.43 0.48 245.36 218.86 26.50 8.26 10.44 0.59 1.02 XT19-03 34.20 63.30 7.63 29.20 5.35 1.19 5.25 0.81 4.35 0.84 2.43 0.36 2.40 0.34 157.64 140.87 16.77 8.40 10.22 0.69 0.96 XT19-10 28.20 53.90 6.43 24.40 4.38 1.04 4.33 0.67 3.68 0.72 2.14 0.33 2.22 0.31 132.75 118.35 14.40 8.22 9.11 0.73 0.98 XT19-12 57.30 115.00 12.90 49.90 9.00 1.63 8.33 1.26 6.42 1.21 3.53 0.56 3.69 0.55 271.28 245.73 25.55 9.62 11.14 0.58 1.04 XT19-16 44.90 90.00 10.10 38.70 6.78 1.23 6.61 1.02 5.76 1.13 3.32 0.53 3.43 0.50 214.01 191.71 22.30 8.60 9.39 0.56 1.04 XT19-20 50.50 97.30 10.90 41.40 7.13 1.36 6.95 1.04 5.66 1.11 3.31 0.51 3.32 0.51 231.01 208.59 22.42 9.31 10.91 0.59 1.02 XT19-27 44.40 82.90 9.71 37.10 6.45 1.58 6.06 0.92 4.56 0.85 2.40 0.37 2.46 0.37 200.12 182.14 17.98 10.13 12.95 0.77 0.98 XT19-29 34.90 64.20 7.43 28.20 4.90 1.79 4.84 0.72 3.86 0.73 2.14 0.33 2.18 0.33 156.55 141.42 15.13 9.35 11.48 1.12 0.98 平均值 43.04 83.45 9.61 36.83 6.60 1.44 6.37 0.98 5.18 0.98 2.87 0.44 2.89 0.42 201.09 180.96 20.13 8.98 10.70 0.70 1.00 灰色泥岩 XT19-14 53.00 106.00 12.20 48.10 8.67 1.51 7.96 1.20 6.06 1.17 3.37 0.52 3.39 0.50 253.65 229.48 24.17 9.50 11.21 0.56 1.02 XT19-23 54.20 108.00 12.70 48.40 8.88 1.54 8.09 1.24 6.25 1.23 3.57 0.55 3.72 0.54 258.91 233.72 25.19 9.28 10.45 0.56 1.01 XT19-17 49.70 102.00 11.70 44.20 7.45 1.33 7.20 1.17 6.90 1.40 3.91 0.64 4.11 0.61 242.32 216.38 25.94 8.34 8.67 0.56 1.04 平均值 52.30 105.33 12.20 46.90 8.33 1.46 7.75 1.20 6.40 1.27 3.62 0.57 3.74 0.55 251.63 226.53 25.10 9.04 10.11 0.56 1.02 红色砂岩 XT19-02 26.80 48.90 6.01 22.70 4.20 0.92 4.02 0.63 3.45 0.68 1.94 0.30 2.00 0.28 122.82 109.53 13.29 8.24 9.61 0.68 0.94 XT19-04 27.70 50.70 6.31 24.10 4.68 1.13 4.61 0.80 4.68 0.92 2.68 0.39 2.49 0.36 131.54 114.62 16.92 6.77 7.98 0.74 0.94 XT19-05 47.30 96.90 11.20 42.80 8.18 1.58 7.97 1.21 6.34 1.19 3.46 0.51 3.47 0.49 232.60 207.96 24.64 8.44 9.78 0.60 1.03 XT19-09 27.90 51.40 6.11 22.60 3.99 0.87 4.15 0.65 3.65 0.72 2.21 0.35 2.29 0.33 127.22 112.87 14.35 7.86 8.74 0.65 0.97 XT19-11 26.40 45.50 5.61 21.20 3.67 1.74 3.51 0.55 2.98 0.58 1.70 0.26 1.71 0.25 115.67 104.12 11.55 9.02 11.07 1.48 0.92 XT19-13 23.00 43.40 5.14 19.30 3.61 0.96 3.51 0.56 3.21 0.64 1.79 0.28 1.87 0.27 107.55 95.41 12.14 7.86 8.82 0.83 0.98 XT19-15 27.90 52.20 6.40 25.10 4.62 4.96 4.59 0.73 4.16 0.82 2.38 0.37 2.37 0.35 136.95 121.18 15.77 7.68 8.44 3.29 0.96 XT19-19 28.60 50.60 6.34 23.90 4.36 1.25 4.27 0.68 4.01 0.76 2.22 0.36 2.39 0.36 130.10 115.05 15.05 7.65 8.58 0.89 0.92 XT19-25 24.30 42.40 5.23 20.50 3.73 0.83 3.68 0.66 4.00 0.83 2.32 0.38 2.39 0.37 111.62 96.99 14.63 6.63 7.29 0.69 0.92 XT19-26 27.00 47.50 5.96 22.90 4.15 0.91 3.94 0.62 3.41 0.72 2.08 0.33 2.22 0.32 122.06 108.42 13.64 7.95 8.72 0.69 0.92 XT19-28 27.70 50.50 6.06 23.50 3.99 1.80 3.95 0.58 3.12 0.59 1.72 0.26 1.67 0.25 125.69 113.55 12.14 9.35 11.90 1.39 0.96 XT19-30 28.80 51.90 6.34 24.50 4.18 2.15 3.97 0.58 2.88 0.53 1.59 0.24 1.55 0.23 129.44 117.87 11.57 10.19 13.33 1.61 0.94 平均值 28.62 52.66 6.39 24.43 4.45 1.59 4.35 0.69 3.82 0.75 2.17 0.34 2.20 0.32 132.77 118.13 14.64 8.14 9.52 1.13 0.95 灰色砂岩 XT19-06 24.50 45.10 5.59 21.30 4.07 1.02 4.02 0.67 3.82 0.75 2.16 0.32 2.14 0.30 115.76 101.58 14.18 7.17 8.21 0.77 0.94 XT19-07 30.20 56.10 6.63 24.50 4.36 1.00 4.14 0.60 3.07 0.59 1.83 0.28 1.88 0.28 135.46 122.79 12.67 9.69 11.52 0.72 0.97 XT19-08 30.90 56.60 7.17 27.70 5.10 1.17 4.86 0.72 3.66 0.69 2.06 0.30 2.05 0.28 143.26 128.64 14.62 8.80 10.81 0.72 0.93 XT19-18 29.10 53.80 6.35 24.20 4.27 0.93 4.11 0.63 3.55 0.71 2.07 0.32 2.16 0.31 132.50 118.65 13.85 8.56 9.66 0.68 0.97 XT19-21 35.60 68.00 8.25 32.00 5.89 1.27 5.58 0.87 4.85 0.95 2.71 0.43 2.87 0.41 169.68 151.01 18.67 8.09 8.90 0.68 0.97 XT19-22 27.80 50.30 6.23 23.30 4.30 0.96 4.10 0.66 3.66 0.70 2.02 0.31 2.04 0.29 126.67 112.89 13.78 8.20 9.77 0.70 0.94 XT19-24 33.20 63.60 7.59 29.10 5.40 1.12 5.22 0.83 4.54 0.89 2.54 0.39 2.65 0.39 157.45 140.01 17.44 8.03 8.99 0.64 0.98 平均值 30.19 56.21 6.83 26.01 4.77 1.07 4.58 0.71 3.88 0.75 2.20 0.34 2.26 0.32 140.11 125.08 15.03 8.36 9.70 0.70 0.96
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表 4 DL铀矿床青山口组砂-泥岩铀及部分伴生元素含量表(10-6)
Table 4. Contents of uranium and some associated elements for sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
类型 样号 Y Mo Th U U/Th 类型 样号 Y Mo Th U U/Th 红色泥岩 XT19-01 32.20 0.86 15.20 2.40 0.16 红色砂岩 XT19-11 15.70 0.39 6.80 1.34 0.20 XT19-03 21.00 0.43 10.70 1.46 0.14 XT19-13 17.70 0.31 6.18 1.63 0.26 XT19-10 18.40 0.56 7.68 3.39 0.44 XT19-15 22.40 0.44 8.14 3.69 0.45 XT19-12 31.80 0.83 15.70 2.29 0.15 XT19-19 20.90 0.46 8.20 3.49 0.43 XT19-16 31.00 0.90 13.80 3.01 0.22 XT19-25 23.40 0.68 7.11 5.06 0.71 XT19-20 30.60 0.78 12.60 3.86 0.31 XT19-26 18.70 0.48 7.56 3.65 0.48 XT19-27 21.90 0.48 10.40 1.74 0.17 XT19-28 16.10 0.31 6.91 1.21 0.18 XT19-29 20.30 0.35 8.72 2.04 0.23 XT19-30 14.50 0.24 5.33 0.81 0.15 平均值 25.90 0.65 11.85 2.52 0.23 平均值 19.86 0.46 7.96 2.66 0.33 灰色泥岩 XT19-14 30.50 1.29 15.10 6.99 0.46 灰色砂岩 XT19-06 18.70 0.35 7.15 13.70 1.92 XT19-17 36.20 1.70 15.10 1564.00 103.58 XT19-07 15.30 0.34 7.76 68.90 8.88 XT19-23 31.90 1.89 15.70 47.80 3.04 XT19-08 17.80 0.34 7.03 4.94 0.70 平均值 32.87 1.63 15.30 539.60 35.69 XT19-18 19.50 0.54 7.96 32.00 4.02 红色砂岩 XT19-02 17.00 0.48 8.65 1.57 0.18 XT19-21 25.90 0.50 10.70 4.16 0.39 XT19-04 23.80 0.45 8.44 2.22 0.26 XT19-22 18.90 0.31 7.72 7.17 0.93 XT19-05 29.10 0.86 14.40 5.05 0.35 XT19-24 23.80 0.58 8.52 14.40 1.69 XT19-09 19.00 0.41 7.83 2.24 0.29 平均值 19.99 0.42 8.12 20.75 2.65
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表 5 DL铀矿床青山口组砂-泥岩碳酸盐胶结物C-O同位素结果(‰)
Table 5. Carbon and oxygen isotopic compositions of carbonate cements from sandstone and mudstone of the Qingshankou Formation in DL uranium deposit
类型 样号 δCV-PDB δOV-PDB δOV-SMOW Z t (℃) 类型 样号 δCV-PDB δOV-PDB δOV-SMOW Z t (℃) 红色泥岩 XT19-01 -3.30 -12.40 18.10 114.37 86.59 红色砂岩 XT19-15 -2.50 -17.20 13.10 113.61 121.82 XT19-03 -2.80 -11.60 19.00 115.79 81.16 XT19-19 -0.80 -17.40 12.90 117.00 123.39 XT19-10 -5.60 -13.20 17.30 109.26 92.14 XT19-26 0.30 -17.70 12.70 119.10 125.76 XT19-12 -3.90 -14.10 16.30 112.29 98.54 XT19-30 -3.60 -16.90 13.50 111.51 119.48 XT19-16 -4.10 -16.30 14.10 110.79 114.86 XT19-11 -4.20 -16.70 13.70 110.38 117.94 XT19-20 -1.90 -13.80 16.70 116.54 96.39 XT19-25 -0.80 -17.90 12.40 116.75 127.34 XT19-27 -5.00 -12.70 17.80 110.74 88.66 XT19-28 -4.90 -16.80 13.50 108.90 118.71 XT19-29 -5.10 -16.10 14.30 108.84 113.34 平均值 -1.96 -17.07 13.29 114.78 120.86 平均值 -3.96 -13.78 16.70 112.32 96.46 灰色砂岩 XT19-06 -0.20 -17.20 13.20 118.32 121.82 灰色泥岩 XT19-14 -4.50 -17.60 12.80 109.32 124.96 XT19-07 0.30 -17.00 13.40 119.45 120.26 XT19-23 -2.90 -15.00 15.50 113.89 105.10 XT19-08 -1.60 -16.50 13.90 115.81 116.40 平均值 -3.70 -16.30 14.15 111.61 115.03 XT19-18 -1.60 -18.00 12.30 115.06 128.14 红色砂岩 XT19-02 -3.30 -16.50 13.90 112.32 116.40 XT19-21 0.30 -17.30 13.10 119.30 122.60 XT19-04 -0.10 -17.00 13.40 118.63 120.26 XT19-22 0.30 -17.70 12.60 119.10 125.76 XT19-09 1.40 -17.70 12.70 121.35 125.76 XT19-24 -0.10 -18.20 12.10 118.03 129.74 XT19-13 -3.10 -16.00 14.40 112.98 112.58 平均值 -0.37 -17.41 12.94 117.87 123.53 注：Z(%NaCl)=2.048×(δ13CPDB+50)+0.498×(δ18OPDB+50)，据Keith and Weber(1964)；t=16.9-4.38×(δ18OPDB-δw)+0.1×(δ18OPDB-δw)2，据Shackleton(1974)，其中，δw为当时海水氧同位素值，取0.
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