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SCIENTIA SINICA Terrae, Volume 51 , Issue 5 : 734-740(2021) https://doi.org/10.1360/N072020-0277

中国吉林晚三叠世天桥岭植物群时代的确定: 来自LA-ICP-MS锆石U-Pb年龄的证据

冯玉辉 1,2, 杨涛 1,2, 梁飞 1,2, 孙革 1,2,3,*
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  • ReceivedAug 19, 2020
  • AcceptedNov 23, 2020
  • PublishedMar 29, 2021

Abstract


Funded by

国家自然科学基金项目(41072011)

辽宁省教育厅基金项目(LQN201916)

沈阳师范大学博士启动基金项目(BS201911)


References

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  • 图 1

    晚三叠世天桥岭植物群分布及地层特征

    (a) 天桥岭植物群化石分布及同位素测年样品位置平面图; (b) 大兴沟群岩性剖面及天桥岭植物群化石分布综合柱状图

  • 图 2

    同位素测年样品(流纹岩)照片

    (a) 样品野外照片; (b) 样品手标本照片; (c) 样品偏光显微镜照片(单偏光); (d) 样品偏光显微镜照片(正交偏光)

  • 图 3

    同位素测年样品部分锆石阴极发光图像及测年结果

    (a) 部分锆石阴极发光图像及年龄; (b), (c) 同位素测年样品谐和图; (d) 同位素测年样品加权平均年龄

  • 表 1   TQL-1样品LA-ICP-MS锆石U-Pb年龄数据

    样品点号

    含量(×10−6)

    Th/U

    同位素比值

    年龄(Ma)

    和谐度(%)

    Th

    U

    207Pb/206Pb

    1σ

    207Pb/235U

    1σ

    206Pb/238U

    1σ

    208Pb/232Th

    1σ

    207Pb/206Pb

    1σ

    207Pb/235U

    1σ

    206Pb/238U

    1σ

    TQL-1-1

    30.1287

    71.8597

    0.4193

    0.0476

    0.0028

    0.2098

    0.0123

    0.0325

    0.0009

    0.0104

    0.0005

    76.0

    133.3

    193.4

    10.3

    206.4

    5.5

    93

    TQL-1-2

    48.8342

    98.4736

    0.4959

    0.0572

    0.0028

    0.2514

    0.0109

    0.0328

    0.0007

    0.0107

    0.0004

    501.9

    109.2

    227.7

    8.9

    208.2

    4.4

    91

    TQL-1-3

    41.3666

    90.4110

    0.4575

    0.0546

    0.0028

    0.2458

    0.0123

    0.0329

    0.0007

    0.0104

    0.0004

    398.2

    114.8

    223.2

    10.0

    208.5

    4.7

    93

    TQL-1-4

    39.4761

    85.5313

    0.4615

    0.0532

    0.0030

    0.3031

    0.0168

    0.0417

    0.0009

    0.0123

    0.0005

    338.9

    125.0

    268.8

    13.1

    263.2

    5.4

    97

    TQL-1-5

    28.3539

    69.1937

    0.4098

    0.0558

    0.0034

    0.2605

    0.0137

    0.0345

    0.0008

    0.0114

    0.0006

    455.6

    135.2

    235.1

    11.0

    218.7

    4.8

    92

    TQL-1-6

    28.0180

    80.7364

    0.3470

    0.0501

    0.0026

    0.2343

    0.0119

    0.0343

    0.0008

    0.0116

    0.0006

    211.2

    120.4

    213.8

    9.8

    217.3

    4.9

    98

    TQL-1-7

    89.4613

    146.9243

    0.6089

    0.0523

    0.0022

    0.2390

    0.0105

    0.0330

    0.0007

    0.0109

    0.0004

    298.2

    98.1

    217.6

    8.6

    209.2

    4.2

    96

    TQL-1-8

    37.9494

    88.3323

    0.4296

    0.0529

    0.0024

    0.2444

    0.0114

    0.0338

    0.0006

    0.0108

    0.0004

    324.1

    108.3

    222.0

    9.3

    214.1

    4.0

    96

    TQL-1-9

    24.1968

    61.9093

    0.3908

    0.0527

    0.0028

    0.2329

    0.0119

    0.0329

    0.0007

    0.0108

    0.0005

    322.3

    122.2

    212.6

    9.8

    208.9

    4.5

    98

    TQL-1-10

    30.7454

    77.8556

    0.3949

    0.0551

    0.0029

    0.2497

    0.0122

    0.0338

    0.0008

    0.0117

    0.0005

    416.7

    116.7

    226.4

    10.0

    214.0

    4.9

    94

    TQL-1-11

    16.8825

    49.8318

    0.3388

    0.0512

    0.0045

    0.2273

    0.0137

    0.0330

    0.0009

    0.0116

    0.0006

    250.1

    205.5

    208.0

    11.3

    209.5

    5.8

    99

    TQL-1-12

    31.8784

    78.1331

    0.4080

    0.0536

    0.0027

    0.2528

    0.0127

    0.0347

    0.0008

    0.0104

    0.0005

    353.7

    114.8

    228.8

    10.3

    219.8

    4.7

    95

    TQL-1-13

    21.2519

    56.9551

    0.3731

    0.0562

    0.0033

    0.2647

    0.0155

    0.0350

    0.0008

    0.0130

    0.0009

    461.2

    132.2

    238.5

    12.4

    221.6

    5.2

    92

    TQL-1-14

    34.0120

    79.8248

    0.4261

    0.0510

    0.0026

    0.2339

    0.0120

    0.0333

    0.0007

    0.0104

    0.0004

    239.0

    118.5

    213.4

    9.9

    210.9

    4.5

    98

    TQL-1-15

    175.6935

    242.6602

    0.7240

    0.0536

    0.0018

    0.2462

    0.0083

    0.0335

    0.0007

    0.0111

    0.0003

    366.7

    77.8

    223.5

    6.7

    212.7

    4.5

    95

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