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    青藏高原拉萨地块发现古元古代地体

    何世平 李荣社 王超 张宏飞 计文化 于浦生 辜平阳 时超

    何世平, 李荣社, 王超, 张宏飞, 计文化, 于浦生, 辜平阳, 时超, 2013. 青藏高原拉萨地块发现古元古代地体. 地球科学, 38(3): 519-528. doi: 10.3799/dqkx.2013.052
    引用本文: 何世平, 李荣社, 王超, 张宏飞, 计文化, 于浦生, 辜平阳, 时超, 2013. 青藏高原拉萨地块发现古元古代地体. 地球科学, 38(3): 519-528. doi: 10.3799/dqkx.2013.052
    HE Shi-ping, LI Rong-she, WANG Chao, ZHANG Hong-fei, JI Wen-hua, YU Pu-sheng, GU Ping-yang, SHI Chao, 2013. Discovery of the Paleoproterozoic Terrane in Lhasa Block, Qinghai-Tibet Plateau. Earth Science, 38(3): 519-528. doi: 10.3799/dqkx.2013.052
    Citation: HE Shi-ping, LI Rong-she, WANG Chao, ZHANG Hong-fei, JI Wen-hua, YU Pu-sheng, GU Ping-yang, SHI Chao, 2013. Discovery of the Paleoproterozoic Terrane in Lhasa Block, Qinghai-Tibet Plateau. Earth Science, 38(3): 519-528. doi: 10.3799/dqkx.2013.052

    青藏高原拉萨地块发现古元古代地体

    doi: 10.3799/dqkx.2013.052
    基金项目: 

    中国地质大调查项目"青藏高原前寒武纪地质、古生代构造-古地理综合研究" 1212010610102

    详细信息
      作者简介:

      何世平(1963-), 男, 研究员, 主要从事大地构造、地球化学研究.E-mail: xakeyi@163.com

    • 中图分类号: P587;P597+.3

    Discovery of the Paleoproterozoic Terrane in Lhasa Block, Qinghai-Tibet Plateau

    • 摘要: 拉萨地块东部呈断块状分布的松多岩群包括岔萨岗岩组、马布库岩组和雷龙库岩组, 对其形成时代存在较大分歧.通过高精度的LA-ICP-MS(激光剥蚀等离子体质谱仪)锆石微区原位U-Pb同位素测年, 西藏工布江达县一带岔萨岗岩组变基性火山岩中获得2 450.3±9.9 Ma的不一致线上交点年龄, 为原岩形成时代, 属于古元古代早期, 是目前拉萨地块获得的最老基底同位素年龄值.依据野外调研和新获得的同位素年代学数据, 结合新近完成的区域地质调查资料, 建议将原"松多岩群"解体, 新建工布江达岩群(Pt1Gb), 松多岩群仅保留马布库岩组(AnOm)和雷龙库岩组(AnOl).拉萨地块古元古代地体的发现, 对重新厘定该区前寒武纪基底格架、区域对比、构造归属划分以及寻找与前寒武纪相关的矿产具有重要意义.

       

    • 图  1  拉萨地块东部西藏工布江达县一带地质简图

      1.新生界;2.中生界;3.上古生界;4.下古生界;5.前奥陶系松多岩群雷龙库岩组;6.前奥陶系松多岩群马布库岩组;7.前奥陶系松多岩群岔萨岗岩组;8.中新元古界念青唐古拉岩群;9.中新元古界林芝岩群;10.古近纪花岗岩;11.白垩纪花岗闪长岩;12.侏罗纪花岗闪长岩;13.三叠纪花岗闪长岩;14.缝合带及编号;15.断裂/推测断裂;16.公路/水系;17.研究区范围;18.采样位置及编号;①康西瓦-木孜塔格-玛沁-勉县-略阳缝合带;②西金乌兰-金沙江缝合带;③班公湖-怒江缝合带;④雅鲁藏布江缝合带

      Fig.  1.  Earstern Lhasa block in Gongbujiangda County, Tibet

      图  2  松多岩群岔萨岗岩组变基性火山岩锆石CL图像(单位: Ma)

      锆石中的圆圈为同位素测年激光剥蚀的示意范围, 相应的编号为测点号, 其他数字为207Pb/206Pb年龄和误差

      Fig.  2.  CL images of zircons from meta-basic volcanic rock in Chasagang rock formation of Songduo rock group

      图  3  松多岩群岔萨岗岩组变基性火山岩锆石U-Pb年龄谐和图(单位: Ma)

      Fig.  3.  U-Pb concordia diagram of zircons from meta-basic volcanic rock in Chasagang rock formation of Songduo rock group

      图  4  拉萨地块东段西藏工布江达县一带前寒武系分布

      1.显生宇;2.前奥陶系松多岩群雷龙库岩组(AnOl);3.前奥陶系松多岩群马布库岩组(AnOm);4.中新元古界林芝岩群(Pt2-3L);5.中新元古界念青唐古拉岩群(Pt2-3N);6.古元古代工布江达岩群(Pt1Gb)

      Fig.  4.  Precambrian of the eastern Lhasa block in Gongbujiangda County, Tibet

      表  1  拉萨地块松多岩群岔萨岗岩组变基性火山岩单颗粒锆石LA-ICP-MS U-Pb同位素测年结果

      Table  1.   The results of the LA-ICP-MS U-Pb isotopic dating for the single-grain zircon from meta-basic volcanic rock in Chasagang rock formation of Songduo rock group

      样点编号 同位素比值 同位素年龄(Ma) 同位素含量(μg·g-1) Th/U
      207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 204Pb 206Pb 207Pb 208Pb 232Th 238U
      比值 比值 比值 比值 年龄 年龄 年龄 年龄
      07SD-1-01 0.160 0.002 9.451 0.095 0.427 0.004 0.135 0.001 2 442 25 2 370 10 2 288 19 2 269 22 9.45 1 396.42 270.39 33.06 107.13 749.63 0.14
      07SD-1-02 0.162 0.002 9.879 0.098 0.443 0.005 0.166 0.002 2 335 30 2 331 12 2 326 21 2 325 25 56.67 2 251.40 457.53 145.75 426.92 1 101.38 0.39
      07SD-1-03 0.156 0.002 9.264 0.091 0.431 0.004 0.120 0.001 2 414 8 2 364 9 2 308 20 2 292 19 0.64 1 613.01 297.31 25.27 88.32 855.13 0.10
      07SD-1-04 0.171 0.002 6.137 0.060 0.261 0.003 0.017 0.000 2 564 8 1 996 9 1 494 14 343 3 96.49 4 052.15 816.52 121.47 2 977.47 3 545.16 0.84
      07SD-1-05 0.159 0.002 11.010 0.108 0.503 0.005 0.114 0.001 2 442 8 2 524 9 2 628 22 2 190 18 13.86 2 658.65 498.21 29.72 108.97 1 205.73 0.09
      07SD-1-06 0.161 0.002 10.963 0.111 0.493 0.005 0.118 0.001 2 471 8 2 520 9 2 582 22 2 253 19 12.05 854.52 167.70 95.72 318.65 387.25 0.82
      07SD-1-08 0.160 0.002 10.744 0.105 0.488 0.005 0.132 0.001 2 451 8 2 501 9 2 564 22 2 501 21 9.88 2 008.55 378.45 48.02 152.99 938.58 0.16
      07SD-1-09 0.161 0.002 10.400 0.105 0.469 0.005 0.107 0.001 2 465 8 2 471 9 2 479 21 2 050 18 4.95 1 313.06 257.92 90.84 307.79 566.64 0.54
      07SD-1-10 0.157 0.002 11.152 0.109 0.514 0.005 0.094 0.001 2 428 8 2 536 9 2 673 22 1 823 15 69.29 2 908.02 540.55 66.62 296.25 1 291.61 0.23
      07SD-1-11 0.157 0.002 10.265 0.100 0.474 0.005 0.095 0.001 2 423 8 2 459 9 2 503 21 1 841 15 4.35 3 154.28 584.50 69.57 306.21 1 517.30 0.20
      07SD-1-12 0.162 0.002 9.125 0.090 0.409 0.004 0.041 0.000 2 475 8 2 351 9 2 209 19 809 7 46.89 3 245.91 620.57 45.66 469.18 1 812.20 0.26
      07SD-1-13 0.161 0.002 11.404 0.112 0.514 0.005 0.116 0.001 2 464 8 2 557 9 2 676 22 2 221 18 6.85 2 867.96 544.55 211.02 762.45 1 272.40 0.60
      07SD-1-14 0.157 0.002 11.405 0.112 0.526 0.005 0.110 0.001 2 426 8 2 557 9 2 725 23 2 118 17 <0.54 2 468.11 458.36 42.40 161.09 1 070.86 0.15
      07SD-1-15 0.161 0.002 10.473 0.104 0.471 0.005 0.137 0.001 2 470 8 2 478 9 2 487 21 2 600 22 1 312.01 4 112.61 1 795.75 1 301.97 1 360.04 1 594.78 0.85
      07SD-1-16 0.161 0.002 11.208 0.110 0.504 0.005 0.137 0.001 2 470 8 2 541 9 2 631 22 2 597 21 17.37 2 331.49 444.17 71.48 218.79 1 056.02 0.21
      07SD-1-17 0.155 0.002 9.540 0.094 0.447 0.005 0.111 0.001 2 401 8 2 391 9 2 381 20 2 124 17 <0.57 1 040.14 190.25 57.98 219.58 531.41 0.41
      07SD-1-18 0.160 0.002 10.038 0.099 0.455 0.005 0.109 0.001 2 457 8 2 438 9 2 416 21 2 098 17 <0.37 904.78 171.07 110.25 423.09 454.11 0.93
      07SD-1-19 0.161 0.002 9.641 0.095 0.434 0.004 0.116 0.001 2 468 8 2 401 9 2 323 20 2 219 19 4.23 1 422.05 270.73 39.45 142.68 748.25 0.19
      07SD-1-20 0.159 0.002 10.365 0.101 0.474 0.005 0.115 0.001 2 442 8 2 468 9 2 500 21 2 204 18 15.54 2 737.95 513.11 86.62 315.55 1 319.08 0.24
      07SD-1-21 0.161 0.002 10.328 0.101 0.465 0.005 0.092 0.001 2 468 8 2 465 9 2 461 21 1 779 15 14.74 2 940.46 559.63 41.91 191.20 1 443.80 0.13
      07SD-1-22 0.164 0.002 11.338 0.112 0.502 0.005 0.107 0.001 2 497 8 2 551 9 2 621 22 2 054 17 56.92 2 445.83 492.93 208.87 670.04 1 077.87 0.62
      07SD-1-23 0.156 0.002 11.159 0.109 0.517 0.005 0.115 0.001 2 418 8 2 536 9 2 688 22 2 193 18 1.86 2 481.67 458.51 159.94 585.63 1 094.87 0.53
      07SD-1-24 0.158 0.002 10.137 0.100 0.467 0.005 0.119 0.001 2 430 8 2 447 9 2 469 21 2 265 19 6.09 1 366.06 254.18 64.58 228.59 668.15 0.34
      07SD-1-26 0.160 0.002 8.565 0.084 0.388 0.004 0.077 0.001 2 455 8 2 293 9 2 115 18 1 501 12 19.17 3 206.29 636.60 140.15 670.95 1 615.09 0.42
      07SD-1-27 0.155 0.002 9.406 0.093 0.439 0.004 0.102 0.001 2 407 8 2 378 9 2 346 20 1 958 17 2.43 1 196.77 219.69 31.63 130.50 622.34 0.21
      07SD-1-28 0.157 0.002 11.105 0.109 0.514 0.005 0.145 0.001 2 421 8 2 532 9 2 673 22 2 738 23 30.08 3 935.97 728.55 85.45 247.20 1 748.12 0.14
      07SD-1-29 0.157 0.002 11.373 0.111 0.527 0.005 0.078 0.001 2 419 8 2 554 9 2 728 23 1 518 13 49.82 4 215.59 779.45 32.04 172.42 1 826.24 0.09
      07SD-1-30 0.161 0.002 11.092 0.108 0.500 0.005 0.111 0.001 2 465 8 2 531 9 2 614 22 2 128 17 9.66 3 893.54 739.87 356.53 1 347.93 1 777.38 0.76
      注: LA-ICP-MS U-Pb同位素含量和年龄测试在西北大学大陆动力学国家重点实验室完成, 使用Andersen(2002)的方法进行了普通铅校正, 谐和度=(207Pb/206Pb)/(206Pb/238U)×100.
      下载: 导出CSV
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