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大兴安岭中部乌兰浩特地区林西组碎屑岩锆石U-Pb年龄、地球化学特征及其构造意义

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张海华, 张健, 黄欣, 邱亮, 苏飞, 郑月娟, 张德军. 大兴安岭中部乌兰浩特地区林西组碎屑岩锆石U-Pb年龄、地球化学特征及其构造意义[J]. 地质通报, 2019, 38(9): 1484-1500.
引用本文: 张海华, 张健, 黄欣, 邱亮, 苏飞, 郑月娟, 张德军. 大兴安岭中部乌兰浩特地区林西组碎屑岩锆石U-Pb年龄、地球化学特征及其构造意义[J]. 地质通报, 2019, 38(9): 1484-1500.
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ZHANG Haihua, ZHANG Jian, HUANG Xin, QIU Liang, SU Fei, ZHENG Yuejuan, ZHANG Dejun. Zircon U-Pb age, geochemical characteristics and tectonic implications of detrital zircon from Linxi Formation in the Wulanhaote area, central Da Hinggan Mountains[J]. Geological Bulletin of China, 2019, 38(9): 1484-1500.
Citation: ZHANG Haihua, ZHANG Jian, HUANG Xin, QIU Liang, SU Fei, ZHENG Yuejuan, ZHANG Dejun. Zircon U-Pb age, geochemical characteristics and tectonic implications of detrital zircon from Linxi Formation in the Wulanhaote area, central Da Hinggan Mountains[J]. Geological Bulletin of China, 2019, 38(9): 1484-1500.
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大兴安岭中部乌兰浩特地区林西组碎屑岩锆石U-Pb年龄、地球化学特征及其构造意义

  • 1.

    中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110034

  • 2.

    中国地质大学(北京)地球科学与资源学院, 北京 100083

  • 基金项目:
    中国地质调查局项目《松辽外围西部盆地油气基础地质调查》(编号：DD20160163)和《松辽盆地北部及外围石炭—二叠系油气地质调查》(编号：DD20190097)
详细信息
    作者简介: 张海华(1986-), 男, 硕士, 工程师, 从事岩石学、大地构造学研究。E-mail:zhanghaihua311@163.com
    通讯作者: 黄欣(1985-), 女, 硕士, 工程师, 从事地层古生物、古生态研究。E-mail:158776077@qq.com

  • 中图分类号: P588.21;P597+.3

Zircon U-Pb age, geochemical characteristics and tectonic implications of detrital zircon from Linxi Formation in the Wulanhaote area, central Da Hinggan Mountains

  • 1.

    Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China

  • 2.

    School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China

More Information

    摘要

  • 内蒙古乌兰浩特地区出露一套缺少化石、遭受接触变质作用的厚层碎屑岩。在该套地层采集碎屑锆石样品，进行碎屑锆石U-Pb测年研究。80个锆石分析点的年龄可分为3个主要年龄区间：242~294Ma，年龄加权平均值为263.6±3.3Ma(n=50，MSWD=4.9)，峰值年龄为261Ma；301~381Ma，峰值年龄为348Ma；454~530Ma，峰值年龄为487Ma。另有7个锆石分析点的年龄分别为824Ma、836Ma、859Ma、867Ma、1279Ma、1556Ma、2447Ma。261Ma的峰值年龄限定了该地层的沉积下限，即属晚二叠世林西组。主量元素SiO2含量为67.81%，Al2O3为18.22%，MgO为1.44%，CaO为0.41%，Na2O为1.54%，K2O为3.90%，K2O/Na2O为1.15~10.21；A12O3/(CaO+Na2O)为4.87~26.38；稀土元素总量介于162.39×10-6~223.46×10-6之间，平均值为200.88×10-6，负Eu异常，Ce为1.00~1.05，轻稀土元素富集，重稀土元素亏损，微量元素以亏损Nb、Ta、Sr，富集Rb、Ba、La、Ce、Pb、Nd、Sm为特征。以上分析表明，林西组形成于活动大陆边缘构造背景。依据碎屑锆石年龄谱值信息，林西组沉积物源具多样性和复杂性，除东北各地块，同时存在华北板块和西伯利亚板块的物源信息，说明林西组沉积时期华北板块与西伯利亚板块可能已经开始俯冲碰撞过程。

    There are a set of thick layers of rocks in Wulanhaote of Inner Mongolia which are lack of fossil and suffered from contact metamorphism. LA-ICP-MS U-Pb isotope test was performed on the zircons from the clastic rock samples. The concordant-near concordant ages of 80 zircons were obtained. The 80 detrital zircons can be divided into three groups according to age and frequency distribution characteristics:242~294Ma with peak age at 261 Ma; 301~381Ma with peak age at 348, and 454~530Ma with peak age at 487Ma. In addition, other 7 zircons have ages of 824Ma, 836Ma, 859Ma, 867Ma, 1279Ma, 1556Ma and 2447Ma. The weighted average age for the youngest age group is 263.6±3.3Ma (MSWD=4.9, n=50), consistent with the minimum peak age of 261 Ma. It is inferred that the maximum deposition age of the Linxi Formation is 261 Ma. The major chemical composition of these rocks is SiO2 67.81%, Al2O3 18.22%, MgO 1.44%, CaO 0.41%, Na2O 1.54% and K2O 3.90%, with K2O/Na2O between 1.15 and 10.21, A12O3/(CaO + Na2O) between 4.87 and 26.38. The value of rare earth element ΣREE is in the range of 162.39×10-6~223.46×10-6, averagely 200.88×10-6. δEu is in the range of 0.58~0.71, averagely 0.64. δCe is between 1.00 and 1.05. The clastic rocks are characterized by LREE enrichment and HREE depletion. Trace elements are characterized by depletion of Nb, Ta, Sr and enrichment of Rb, Ba, La, Ce, Pb, Nd, Sm.These data show that the Linxi Formation was formed in an active continental marginal structural background. Based on detrital zircon age profile information, the authors hold that sediment sources in Linxi Formation were diverse and complex, in addition to blocks in the northeast, there existed provenance information for the North China plate and the Siberia plate at the same time, suggesting that the North China plate and the Siberia plate probably began the subduction collision process during the deposition period of the Linxi Formation.

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  • 图 1  研究区地质略图

    Figure 1. 

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    图 2  林西组碎屑岩宏观（a）及镜下特征（b，正交偏光）照片

    Figure 2. 

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    图 3  林西组(D1142TWS)碎屑锆石阴极发光（CL）图像和年龄

    Figure 3. 

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    图 4  林西组(D1142TWS)碎屑锆石稀土元素配分曲线

    Figure 4. 

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    图 5  林西组碎屑锆石U-Pb年龄频率分布图

    Figure 5. 

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    图 6  林西组碎屑岩锆石U-Pb谐和图

    Figure 6. 

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    图 7  微量元素蛛网图（a）及稀土元素配分模式图（b）

    Figure 7. 

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    图 8  林西组碎屑岩物源属性判别

    Figure 8. 

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    图 9  林西组碎屑岩构造背景判别

    Figure 9. 

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    图 10  林西组碎屑岩构造背景判别

    Figure 10. 

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    表 1  林西组碎屑岩锆石原位微区稀土元素分析测试结果

    Table 1.  REE analyses of the detrital zircons from Linxi Formation

    10-6
    测点 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu δEu δCe
    1 4.99 45.6 1.82 12.6 12 3.19 49.7 16.1 193 69.9 321 65.2 657 121 0.34 3.17
    2 0.152 17.5 0.306 3.78 6.5 1.86 34.3 12.1 153 58.3 276 60.3 646 124 0.29 13.8
    3 11.3 36.5 3.33 16.1 4.77 0.97 14.3 4.98 64.7 26.1 133 31.5 353 72.1 0.33 7.66
    4 52.5 183 17.1 83.3 21.9 2.52 43.1 13 155 56.6 261 56.3 563 101 0.68 43.4
    5 0.0602 12.2 0.051 0.734 1.49 0.286 9.12 3.64 48.6 19.1 91.5 20.3 213 40.3 0.17 0.89
    6 1.16 21.9 0.655 3.86 2.94 1.03 11.6 4.03 50.4 20.5 103 24.4 274 55.5 0.11 1.84
    7 0.511 14.2 0.223 3.27 5.72 0.748 32.8 11.4 142 51.7 233 48.3 474 85.7 0.21 6.84
    8 1.34 25.3 0.614 5.43 8.1 1.54 40.9 14.7 186 70.5 330 66.1 674 127 0.34 5.15
    9 4.85 31.7 1.53 9.12 5.9 0.85 18.2 6.07 72.3 25.2 115 24.7 251 45.7 0.34 3.71
    10 0.767 38.5 0.487 3.84 4.56 0.961 21 7.63 105 41.7 200 44.4 467 90.4 0.16 4.53
    11 0.0644 28.9 0.117 1.97 3.84 1.29 21 7.91 106 42.4 205 46.5 498 97.3 0.13 10.3
    12 0.263 8.7 0.199 1.59 1.91 0.271 10.4 4.03 50.7 20 96.6 23 263 53.1 0.34 2.05
    13 0.0345 24.3 0.103 1.74 4.19 1.54 22.5 8.39 108.6 42.3 200 43.2 453 87.8 0.2 1.12
    14 0.0791 12 0.0537 0.952 1.72 1.05 8.67 2.76 34.2 13.1 63.3 15 171 34.8 0.36 58.5
    15 0.0016 2.77 0.0281 0.772 2 0.14 15.3 6.68 89.8 35.8 174.3 39 409 78.6 0.15 8.87
    16 0.68 11.8 0.332 3.67 5.32 0.833 26.9 9.32 116.9 44.1 198 40.8 402 75 0.24 1.11
    17 1.25 51 0.727 5.37 5.34 2.12 20.3 6.38 74.1 26.2 119 25.8 278 55.9 0.18 50.4
    18 31.3 127 19.1 106 29.7 5.18 44.2 11.7 127 43.8 186 37.8 365 66.2 0.1 1.51
    19 1.76 15 0.588 3.72 4.55 0.673 22.2 7.9 100 37.7 179 38.7 403 75.5 0.1 3.07
    20 0.14 8.6 0.275 3.87 7.37 1.23 37.2 12.4 150 53.2 230 46.2 454 83.2 0.21 4.44
    21 0.361 17.9 0.158 1.19 1.62 0.397 8.18 3.03 39.9 15.8 79.7 18.7 211 42.5 0.19 1.18
    22 0.275 18.5 0.124 0.984 1.71 0.436 8.75 3.38 46.3 18.9 97.7 23.5 273 57.1 0.19 8.06
    23 0.328 57 0.311 4.56 6.84 2.14 33.8 11.9 149.7 55.7 257 53.7 549 102 0.47 16.3
    24 12.9 52.6 1.58 6.13 2.65 1.03 10.4 3.27 41 15.6 74.8 17.4 189 38.2 0.33 23.2
    25 286 716 86.3 409 85.8 7.38 99.4 20.9 200 65.6 282 57.6 574 107 0.3 7.33
    26 0.405 1.6 0.087 0.565 1.26 0.333 13.2 7.88 121 42.9 196 44.9 481 83 0.33 1.82
    27 0.643 11.8 0.283 2.29 3.07 0.452 18.6 6.75 89.5 34.5 163 34.8 364 69.4 0.33 1.44
    28 3.55 20.1 1.5 11.4 9.98 3.45 46.7 14.6 171 58.9 247 46.9 436 77.7 0.17 1.74
    29 0.0412 26.7 0.169 2.19 4.75 1.57 28.1 11.1 152 61.1 307 68.6 763 149 0.32 44.7
    30 3.23 28.5 1.59 12.1 10.3 0.814 45 14.6 176 62.9 275 54.2 518 93.7 0.35 62.8
    31 4.07 36.1 0.89 4.33 2.98 0.552 14.9 5.61 77.6 31.3 158 37.9 417 80.8 0.29 2.2
    32 0.311 22.1 0.166 1.91 3.49 0.536 18.7 6.61 88.2 33.9 166 37.7 399 75.4 0.17 6.03
    33 0.317 12.4 0.167 1.79 2.96 0.554 16.7 6.24 78.3 29.2 133 28.1 284 51 0.17 3.6
    34 13.9 69.1 4.9 25.7 9.56 2.13 31.6 10.7 139 53.7 254 57 603 119 0.26 49.4
    35 0.115 7.41 0.0549 0.904 1.79 0.269 11.5 4.15 55.7 21.5 101 22.3 229 43.2 0.26 1.23
    36 0.133 5.1 0.0649 0.884 1.92 0.136 13.4 5.32 71.8 27.9 131 28 290 52.7 0.14 6.78
    37 24.6 98.3 12.4 74 22.6 1.21 39.1 10.3 117 43.2 199 43.1 449 83.2 0.3 11.5
    38 3.4 53.1 0.789 5.69 8.59 2.81 48.6 18.1 238 92 444 89.7 939 174 0.52 2.43
    39 0.24 32 0.213 2.41 4.36 1.5 21.9 8.06 104 39.9 187 40.4 414 78.2 0.14 22.7
    40 0.0542 1.19 0.058 0.922 2.81 0.0814 21.3 9.25 127 46.3 207 43.1 424 76.1 0.12 1.37
    41 0.0779 6.61 0.0375 0.647 1.41 0.439 7.6 2.76 38.4 15.3 79.2 19.3 222 46.2 0.16 23.6
    42 127 306 34 153 28.8 2 32.8 7.34 78.2 28.4 133 29.9 318 61.3 0.32 19.8
    43 0.791 30.6 0.344 3.39 4.59 1.37 19.9 6.71 85.3 32.1 150 32.2 336 64.4 0.21 1.82
    44 1.86 8.3 0.85 6.86 7.86 0.476 38.1 12.8 151 52.7 224 44.4 420 72.9 0.33 29.9
    45 1.3 31.2 0.455 3.23 3.52 0.507 16.8 5.81 75.7 29.3 142 32 351 68.5 0.22 4.13
    46 4.79 20.1 1.97 11.1 4.66 0.279 14.8 5.12 64 24.8 114 24.1 245 46 0.19 26.4
    47 8.17 36.3 2.92 16.4 8.36 2.21 36.2 12.1 149 54.8 243 48.8 475 85.6 0.4 57.3
    48 0.0545 14.9 0.0574 0.926 1.78 0.64 10.2 3.91 55.3 22.9 119 28.7 334 69.8 0.31 14.8
    49 0.258 15.9 0.109 1.37 2.82 0.829 13.8 5.05 66 25.6 120 26.6 283 53.6 0.39 65.8
    50 0.114 29.5 0.198 3.54 8.67 1.8 53.1 18.3 226 81.8 369 72.6 731 134 0.25 15
    51 2.86 25.7 0.788 3.81 2.18 0.388 9.62 3.58 48.3 19.5 98.6 22.9 256 51.2 0.25 1.49
    52 0.0679 4.01 0.0697 1.06 2.45 0.105 10.4 3.24 38.2 13.5 60.2 13 135 24.7 0.38 32.1
    53 16.7 63.3 6.34 34.4 11.9 0.673 32.9 10 124.8 45.9 203 41.6 409 74.8 0.47 6.05
    54 24.6 96.2 7.27 34.7 8.84 0.817 21.3 7.32 97.4 38.6 193 44.4 484 93.8 0.35 40
    55 35.8 91.3 9.73 45.1 10.9 1.03 23.1 7.05 86.7 32.4 151 32.6 339 64 0.19 13.1
    56 20.3 58.1 6.51 37.9 18.4 3.11 60.7 17.9 200 69.1 293 56.2 544 96.1 0.37 14.4
    57 0.865 23.4 0.284 2.53 4.9 1.41 27 9.11 115 42.5 187 39.4 394 72.5 0.44 1.24
    58 2.96 28.4 0.763 6.16 6.37 0.916 33.2 11.7 148 55.4 259 55.7 586 111 0.41 2.13
    59 0.47 42.7 0.627 10.3 18.7 7.32 86 27.4 325 115 516 98.9 1018 184 0.06 5.69
    60 4.34 31.2 1.32 9.29 4.88 1.13 16.8 5.86 77 29.5 147 33.8 362 69.4 0.39 64.8
    61 0.25 15.9 0.148 1.36 2.29 0.72 12.9 4.75 61.9 23.8 114 25 261 49.5 0.2 37.6
    62 9.22 37.4 2.61 12.7 3.82 0.271 12.8 4.75 64.8 26.5 132 31.5 351 70.8 0.17 9.94
    63 0.147 30.7 0.107 1.81 3.33 1.22 17 5.71 72.6 27.9 133 29.2 313 61 0.55 12.9
    64 0.162 8.52 0.296 3.5 4.98 1.17 21 6.91 86.6 32.2 148 31.7 330 60.3 0.28 24.6
    65 3.84 23 1.71 11.9 8.86 1.88 34.5 10.6 126 45.6 202 41.9 430 78.4 0.72 1.94
    66 0.552 12.9 0.554 3.72 4.17 1.29 21.2 8.43 114 45 217 48.4 498 91.5 0.07 1.61
    67 0.117 14.4 0.123 1.93 4.04 0.777 23.2 8.57 111 43.8 204 43.6 449 84.5 0.09 1.6
    68 6.42 40 1.84 9.41 4.46 0.666 15.3 5.01 61.5 23.5 111 25.4 277 53.1 0.03 5.71
    69 2.53 18 1.46 11.7 10.1 2.13 32.4 9.13 95.1 31.1 131 26.9 270 48.7 0.17 7.25
    70 0.0581 5.47 0.211 4.51 8.53 1.26 41 12.9 147 50 206 39.4 372 64.6 0.05 12.9
    71 0.104 25.9 0.121 1.59 3.47 0.925 20.7 7.53 97.8 37.3 176 38.1 394 74.5 0.22 2.82
    72 0.0219 23 0.0995 1.92 4.52 1.72 25.4 9.05 114 42.8 192 40.5 412 74.8 0.24 37.1
    73 1300 2018 181 652 66.3 3.62 66.1 16.5 200 77.12 385 82.7 905 171 0.27 18.3
    74 8.62 43.1 3.43 19.4 13.2 4.98 31.5 10.5 112 35 150 31.8 324 58.3 0.02 4.62
    75 0.169 18.3 0.0854 1.26 2.22 0.475 10.9 3.93 50.6 19.6 94.3 21.5 238 45.9 0.06 29.9
    76 8.6 39.7 3.31 18.9 8.57 1.16 27.6 8.98 109.9 41 189 40.6 419 78.4 0.33 2.26
    77 0.33 21 0.34 2.31 3.23 0.751 13.8 5.48 74.4 30.2 154 35.9 408 80 0.13 7.24
    78 0.0185 2.9 0.15 3.11 5.72 0.155 24.9 7.56 82.4 27.6 116 22.8 223 41.2 0.16 1.99
    79 0.0564 12.1 0.495 1.44 3.86 0.506 23.1 8.63 112.7 42.7 194 40.7 404 74.3 0.06 13.4
    80 0.028 1.69 0.0809 1.5 3.86 0.233 20.7 7.07 84.8 29.7 126 24.9 243 43.4 0.23 2.83
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    表 2  林西组碎屑锆石LA-ICP-MS U-Th-Pb分析结果

    Table 2.  LA-ICP-MS U-Th-Pb isotope composition of the detrital zircons from the Linxi Formation

    测点 元素含量/10-6 Th/U 同位素比值及误差 年龄/Ma
    Pb Th U 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 207Pb/206Pb ±1σ 207Pb/235U ±1σ Pb/206U238 ±1σ
    1 8.87 191 149 1.28 0.0522 0.0017 0.29 0.01 0.0402 0.0009 295 39 258 7 254 5
    2 27.4 340 449 0.76 0.0522 0.0013 0.327 0.0081 0.0454 0.0009 296 26 288 6 286 6
    3 6.48 57 125 0.46 0.0524 0.002 0.302 0.011 0.0418 0.0009 302 48 268 9 264 6
    4 25.5 308 415 0.74 0.0561 0.0013 0.357 0.0085 0.0461 0.0009 456 24 310 6 291 6
    5 6.66 62.8 131 0.48 0.0504 0.002 0.286 0.011 0.0411 0.0009 214 53 255 9 260 6
    6 46.7 290 837 0.35 0.0533 0.0012 0.343 0.0078 0.0467 0.001 340 23 300 6 294 6
    7 39.8 517 764 0.68 0.0516 0.0013 0.287 0.0074 0.0403 0.0008 269 27 256 6 255 5
    8 14.8 173 286 0.6 0.0519 0.0016 0.285 0.0087 0.0398 0.0008 281 35 255 7 252 5
    9 99.2 70 177 0.39 0.159 0.0031 9.37 0.2 0.427 0.0087 2447 16 2375 19 2291 39
    10* 21.2 249 335 0.74 0.0599 0.0038 0.377 0.023 0.0457 0.001 600 142 325 17 288 6
    11 16 266 274 0.97 0.0526 0.0014 0.305 0.0081 0.042 0.0009 312 28 270 6 265 5
    12 31.1 170 650 0.26 0.052 0.0018 0.293 0.01 0.0408 0.0009 287 42 261 8 258 5
    13 6.42 67.9 85 0.8 0.0553 0.0023 0.418 0.018 0.0548 0.0012 422 55 355 13 344 7
    14 7.27 81.7 146 0.56 0.0508 0.0021 0.274 0.011 0.0391 0.0009 229 55 246 9 247 5
    15 124.7 103 788 0.13 0.0668 0.0014 1.28 0.028 0.138 0.0028 833 20 835 12 836 16
    16 9.2 84.9 175 0.49 0.0517 0.0015 0.301 0.009 0.0422 0.0009 270 34 267 7 266 5
    17 49.7 472 619 0.76 0.054 0.0012 0.453 0.01 0.0609 0.0012 369 23 380 7 381 8
    18 9.39 121 142 0.85 0.0537 0.0025 0.355 0.016 0.048 0.0011 356 64 309 12 302 7
    19 15 143 281 0.51 0.0517 0.0017 0.301 0.0098 0.0422 0.0009 274 38 267 8 266 6
    20 12.6 136 241 0.57 0.0518 0.0018 0.295 0.01 0.0413 0.0009 275 43 262 8 261 5
    21 25 121 230 0.53 0.0575 0.0014 0.68 0.017 0.0856 0.0018 511 24 526 10 530 10
    22 23.1 144 247 0.58 0.0566 0.0013 0.57 0.014 0.0729 0.0015 477 23 458 9 454 9
    23 24.2 359 360 1 0.0513 0.0013 0.338 0.0085 0.0478 0.001 252 26 296 6 301 6
    24 26.8 405 450 0.9 0.0533 0.0012 0.316 0.0075 0.043 0.0009 340 24 279 6 271 5
    25 13 183 239 0.77 0.0547 0.0016 0.308 0.0092 0.0408 0.0009 400 33 273 7 258 5
    26 145 4.31 587 0.01 0.0834 0.0016 2.53 0.052 0.22 0.0045 1279 18 1282 15 1283 24
    27 20.7 148 402 0.37 0.0519 0.0016 0.304 0.0094 0.0425 0.0009 279 36 269 7 268 6
    28 13.6 140 205 0.68 0.057 0.0035 0.386 0.022 0.0491 0.0011 491 141 331 16 309 7
    29 14.5 172 266 0.65 0.0529 0.0017 0.306 0.0099 0.0419 0.0009 325 38 271 8 264 5
    30 23.1 277 439 0.64 0.0518 0.0013 0.295 0.0074 0.0412 0.0009 278 26 262 6 260 5
    31 12.8 124 243 0.51 0.0533 0.0015 0.303 0.0088 0.0412 0.0009 343 32 269 7 260 5
    32 6.62 76 118 0.65 0.0512 0.0017 0.306 0.01 0.0432 0.0009 251 40 271 8 273 6
    33 12.5 95.4 209 0.46 0.0518 0.0014 0.342 0.0094 0.0478 0.001 278 30 299 7 301 6
    34 18.3 339 320 1.06 0.0518 0.0013 0.288 0.0075 0.0403 0.0008 277 27 257 6 255 5
    35 11.8 84 223 0.38 0.0525 0.0015 0.312 0.009 0.043 0.0009 309 32 276 7 272 6
    36 61.4 60.7 190 0.32 0.0964 0.0019 3.49 0.074 0.262 0.0053 1556 18 1524 17 1500 27
    37 15.5 151 280 0.54 0.0535 0.0013 0.319 0.0081 0.0432 0.0009 348 26 281 6 273 5
    38 16 308 289 1.07 0.0517 0.0014 0.275 0.0073 0.0385 0.0008 273 28 247 6 244 5
    39 5.38 69.1 844 0.83 0.0511 0.0019 0.329 0.013 0.0467 0.001 244 49 289 10 294 6
    40 55.6 37.8 355 0.11 0.0666 0.0013 1.25 0.027 0.136 0.0028 826 20 825 12 824 16
    41 8.05 67.1 148 0.45 0.0531 0.0018 0.32 0.011 0.0436 0.0009 335 42 282 9 275 6
    42 10.7 120 201 0.6 0.0555 0.0018 0.31 0.01 0.0405 0.0009 431 37 274 8 256 5
    43 10.3 129 157 0.82 0.0508 0.0015 0.336 0.01 0.0479 0.001 232 34 294 8 301 6
    44 38.8 171 408 0.42 0.0583 0.0012 0.616 0.014 0.0766 0.0016 541 22 487 9 476 9
    45 33.6 300 452 0.66 0.053 0.0012 0.409 0.0095 0.056 0.0011 329 23 348 7 351 7
    46 31.1 84.8 340 0.25 0.0557 0.0013 0.591 0.014 0.0769 0.0016 439 23 471 9 477 9
    47 19.7 273 351 0.78 0.0514 0.0013 0.294 0.0074 0.0415 0.0009 259 26 262 6 262 5
    48 8.97 88.5 174 0.51 0.0526 0.0016 0.294 0.0092 0.0405 0.0009 311 36 262 7 256 5
    49 6.99 76.5 129 0.59 0.0523 0.0023 0.299 0.013 0.0414 0.0009 300 61 265 10 261 6
    50 38.7 566 472 1.2 0.0541 0.0012 0.412 0.0095 0.0552 0.0011 376 23 351 7 346 7
    51 13.7 145 239 0.61 0.0522 0.0014 0.316 0.0085 0.0438 0.0009 294 29 278 7 276 6
    52 92.9 260 977 0.27 0.0568 0.0011 0.624 0.013 0.0796 0.0016 483 21 492 8 494 10
    53 27.8 248 533 0.46 0.0533 0.0014 0.303 0.0081 0.0412 0.0009 339 28 269 6 260 5
    54 15.9 178 289 0.62 0.0516 0.0013 0.298 0.0078 0.0419 0.0009 266 28 265 6 264 5
    55 16.4 194 305 0.63 0.0523 0.0013 0.3 0.0078 0.0413 0.0009 315 27 266 6 261 5
    56 14.2 166 253 0.66 0.0519 0.0014 0.303 0.008 0.0423 0.0009 281 28 269 6 267 5
    57* 14.9 239 226 1.05 0.0608 0.0052 0.356 0.029 0.0425 0.001 631 192 309 22 268 6
    58 38.7 468 736 0.64 0.0513 0.0011 0.285 0.0065 0.0402 0.0008 256 23 255 5 254 5
    59 10.9 216 176 1.23 0.0526 0.002 0.3 0.011 0.0413 0.0009 310 47 266 9 261 6
    60 9.26 98.8 171 0.58 0.0556 0.006 0.268 0.028 0.0349 0.0009 438 245 241 22 221 5
    61 6.38 70.7 111 0.64 0.0526 0.0018 0.314 0.011 0.0433 0.0009 310 41 277 8 273 6
    62 17.8 175 353 0.5 0.0508 0.0013 0.279 0.0071 0.0397 0.0008 232 27 250 6 251 5
    63 6.96 101 108 0.94 0.0536 0.0022 0.336 0.014 0.0453 0.001 356 52 294 10 286 6
    64 17.7 194 330 0.59 0.0529 0.0013 0.302 0.0077 0.0414 0.0009 324 27 268 6 262 5
    65 14.2 178 249 0.71 0.0546 0.0016 0.317 0.0096 0.042 0.0009 397 34 280 7 265 5
    66 40 301 815 0.37 0.0531 0.0012 0.292 0.0068 0.0399 0.0008 333 24 260 5 252 5
    67 18 173 314 0.55 0.0508 0.0013 0.307 0.0079 0.0439 0.0009 231 27 272 6 277 6
    68 53.7 318 510 0.62 0.0568 0.0012 0.624 0.014 0.0797 0.0016 482 22 492 8 494 10
    69 75.1 235 402 0.58 0.0683 0.0014 1.34 0.028 0.143 0.0029 877 20 864 12 859 16
    70 15.9 80.9 154 0.52 0.057 0.0015 0.625 0.017 0.0794 0.0017 494 28 493 11 492 10
    71 14.3 165 254 0.65 0.0499 0.0016 0.291 0.0091 0.0422 0.0009 189 37 259 7 266 5
    72 9.34 94.3 156 0.61 0.0514 0.0015 0.323 0.0097 0.0456 0.001 260 34 284 7 287 6
    73 63.3 1218 1112 1.09 0.0533 0.0011 0.292 0.0062 0.0396 0.0008 343 22 260 5 250 5
    74 29.4 134 311 0.43 0.0562 0.0014 0.581 0.014 0.0749 0.0015 461 25 465 9 465 9
    75 12.4 69.8 116 0.6 0.0576 0.0016 0.645 0.018 0.0812 0.0017 513 29 505 11 503 10
    76 18.9 170 334 0.51 0.0527 0.0014 0.317 0.0085 0.0436 0.0009 315 28 279 7 275 6
    77 12.1 111 248 0.45 0.0537 0.0018 0.283 0.0095 0.0382 0.0008 357 39 253 7 242 5
    78 57.6 175 617 0.28 0.0567 0.0012 0.603 0.013 0.0771 0.0016 478 21 479 8 479 9
    79* 27.3 56.8 148 0.38 0.0805 0.0033 1.6 0.055 0.144 0.003 1210 81 969 22 867 17
    80 4.64 32.4 73.1 0.44 0.0515 0.002 0.359 0.014 0.0505 0.0011 261 50 311 10 318 7
    注：*为不谐和年龄
    下载: 导出CSV

    表 3  林西组样品主量、微量和稀土元素分析结果

    Table 3.  Major, trace and rare earth element composition of clastic rocks from Linxi Formation

    样品号 D1141H X-1 D1141H X-2 D1141H X-3 D1142H X-1 D1142H X-2
    SiO2 60.68 63.77 62.94 66.73 69.29
    TiO2 0.7930 0.6910 0.7240 0.7140 0.7140
    Al2O3 19.63 17.70 18.14 15.79 15.60
    Fe2O3 3.794 1.676 1.996 3.089 2.733
    FeO 2.291 4.268 4.178 1.752 1.123
    MnO 0.1540 0.1890 0.1900 0.07800 0.09400
    MgO 1.523 1.716 1.735 1.054 0.8400
    CaO 0.2630 0.2550 0.2730 0.4100 0.7730
    Na2O 0.4810 1.598 1.674 1.1670 2.429
    K2O 4.912 3.649 3.777 3.460 2.789
    P2O5 0.1100 0.1070 0.1230 0.1450 0.1390
    总量 94.62 95.62 95.74 94.39 96.52
    K2O/Na2O 10.21 2.283 2.257 2.965 1.148
    Ba 587.1 589.8 624.7 486.6 586.7
    Rb 191.0 113.5 120.9 119.8 86.44
    Sr 71.34 76.33 80.19 84.39 172.7
    Zr 267.0 229.3 232.9 243.1 262.6
    Nb 17.01 15.05 14.72 15.06 14.58
    Th 15.71 13.47 13.39 11.57 10.25
    U 2.329 2.114 2.404 2.129 1.750
    Pb 45.37 22.14 23.66 20.92 15.95
    Ga 23.05 22.15 22.14 17.83 17.09
    Cu 13.09 16.68 26.28 12.73 5.470
    Ni 37.38 38.11 41.40 24.85 21.07
    Cr 44.00 43.45 46.02 45.76 37.35
    Cs 15.70 8.042 9.208 13.46 4.807
    Sc 19.28 17.12 17.82 17.97 12.70
    Hf 4.792 3.791 4.574 3.613 3.888
    Ta 0.7270 0.8260 0.8660 0.5300 0.9300
    Li 88.69 66.41 70.25 50.80 45.80
    Co 13.57 14.35 17.06 8.208 11.80
    Y 36.84 31.77 36.24 35.06 25.29
    La 42.92 40.93 42.69 36.07 32.77
    Ce 93.46 90.53 92.13 77.15 68.12
    Pr 10.91 10.26 10.86 9.175 7.935
    Nd 42.16 38.55 42.27 35.58 29.76
    Sm 8.369 7.229 7.730 7.124 5.712
    Eu 1.516 1.448 1.504 1.278 1.242
    Gd 6.648 5.869 6.282 5.993 4.674
    Tb 1.027 0.9110 0.9740 0.9420 0.7180
    Dy 6.644 5.788 6.491 6.291 4.667
    Ho 1.216 1.039 1.222 1.169 0.8560
    Er 3.747 3.092 3.652 3.442 2.570
    Tm 0.5130 0.4460 0.4850 0.4730 0.3680
    Yb 3.882 3.204 3.588 3.504 2.694
    Lu 0.4490 0.3700 0.3990 0.3960 0.3090
    ΣREE 223.5 209.7 220.3 188.59 162.4
    LREE/HREE 8.262 9.120 8.538 7.491 8.634
    (La/Yb)N 7.931 9.163 8.532 7.384 8.725
    δEu 0.6000 0.6590 0.6400 0.5820 0.7130
    δCe 1.032 1.054 1.023 1.013 1.004
    注：主量元素含量单位为%，微量和稀土元素含量单位为10-6
    下载: 导出CSV
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收稿日期:  2018-05-10
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