Zircon U-Pb Ages and Implications of the Dianzhong Formation in Chazi Area, Middle Lhasa Block, Tibet
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摘要: 林子宗群火山岩是在青藏高原南部广泛发育的新生代火山岩,形成于新特斯洋闭合向印度-亚洲大陆碰撞过渡的背景下,其底部典中组火山岩的年龄对限定印度-亚洲大陆的碰撞时限具有重要意义.然而林子宗群火山岩的研究主要集中在拉萨地块东部林周盆地及其附近,其中部和西部的火山岩研究较少,系统的年代学研究则更少.对拉萨地块中段查孜地区的一条林子宗群典中组火山岩剖面进行了系统的锆石U-Pb年代学研究,获得了火山岩锆石U-Pb年龄分别为70.7±1.4 Ma、69.9±1.5 Ma、68.3±1.2 Ma.结合前人资料,对拉萨地块林子宗群火山岩年代学进行了区域对比,结果显示其底部火山岩的年龄沿东西走向存在一定的差别,中段年龄略早于东段和西段,表明印度-亚洲大陆碰撞中段略早于东部和西部.Abstract: The Cenozoic volcanic rocks in Linzizong Group are widely exposed in southern Tibet Plateau and it is considered to have been formed in the transitional process from the end of subduction of Neo-Tethyan oceanic plate to India-Asia continent collision.The age of Dianzhong Formation is significant to constrain the time of collision between India and Asia.However, research on the Linzizong Group volcanic rocks is mainly concentrated on the Linzhou basin and its vicinity in the eastern part of the Lhasa block.There are few studies on volcanic rocks in the central and western parts of the Lhasa block, and very few systematic chronology studies.After the stratigraphic and petrological study, we conducted systematic U-Pb zircon dating on 3 selected samples taken from the geological section of Dianzhong Formation in Chazi area.The results show the ages of Dianzhong Formation are 70.7±1.4 Ma, 69.9±1.5 Ma and 68.3±1.2 Ma, respectively.Combining with previously reported chronological data, it is revealed that there were certain differences of the ages from bottom layer of the Linzizong volcanic rocks in Lhasa block.The initial collision between India and Asia continent took place earlier in middle Lhasa block but later in eastern and western parts.
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Key words:
- middle Lhasa block /
- Linzizong Group /
- volcanic rocks /
- Dianzhong Formation /
- zircon U-Pb age /
- geochemistry /
- geochronology
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图 1 青藏高原南部构造单元划分(a)和研究区地质简图(b)
图a修改自朱弟成等(2006); 70.7~68.3 Ma为本次测试年龄,其他年龄均为前人资料.SXG.狮泉河-许如错-工布江达断裂; THS.吉隆-定日-岗巴-错那断裂
Fig. 1. The structural units division of southern Tibetan Plateau (a) and the simplified geological map of Chazi area (b)
表 1 样品PM022-1-N锆石U-Pb定年结果
Table 1. Zircon U-Pb dating results for sample PM022-1-N
分析点 含量(10-6) 同位素比值 年龄(Ma) Th U Th/U 207Pb/235U 1 σ 206Pb/238U 1 σ 207Pb/235U 1 σ 206Pb/238U 1 σ 1 210 212 0.99 0.084 2 0.020 7 0.010 6 0.000 6 82.1 19.4 68.0 4.1 2 135 171 0.79 0.040 6 0.021 5 0.011 3 0.000 6 40.5 21.0 72.2 4.0 3 192 188 1.02 0.071 4 0.013 9 0.011 0 0.000 6 70.0 13.2 70.5 3.9 4 122 147 0.83 0.078 9 0.023 6 0.011 0 0.000 5 77.1 22.2 70.6 3.4 5 460 313 1.47 0.092 4 0.014 3 0.010 1 0.000 5 89.8 13.3 64.9 3.0 6 165 217 0.76 0.072 3 0.011 5 0.011 2 0.000 5 70.8 10.9 72.1 3.4 7 339 300 1.13 0.073 8 0.010 9 0.011 2 0.000 5 72.3 10.3 71.6 3.5 8 162 193 0.84 0.077 2 0.014 1 0.010 8 0.000 6 75.5 13.3 69.0 3.8 9 447 336 1.33 0.068 7 0.014 4 0.011 2 0.000 5 67.4 13.7 72.1 3.1 10 224 279 0.80 0.078 8 0.010 3 0.011 4 0.000 5 77.0 9.7 73.0 2.9 11 266 282 0.94 0.079 7 0.012 9 0.011 0 0.000 5 77.8 12.1 70.7 3.2 12 331 430 0.77 0.064 2 0.009 5 0.010 8 0.000 4 63.1 9.0 69.3 2.3 13 306 393 0.78 0.072 9 0.012 5 0.010 9 0.000 5 71.5 11.8 70.2 3.0 14 171 250 0.69 0.076 1 0.011 5 0.010 8 0.000 6 74.5 10.9 69.6 3.9 15 368 450 0.82 0.064 9 0.012 1 0.010 6 0.000 5 63.8 11.5 67.8 3.1 16 186 266 0.70 0.069 2 0.015 5 0.010 8 0.000 5 67.9 14.7 69.5 3.2 17 410 608 0.67 0.063 6 0.008 9 0.010 7 0.000 4 62.6 8.5 68.3 2.7 18 78.0 87.1 0.90 0.080 8 0.027 5 0.012 9 0.001 0 78.9 25.8 82.4 6.5 19 517 526 0.98 0.076 3 0.009 7 0.011 1 0.000 4 74.6 9.2 71.4 2.5 20 104 144 0.72 0.077 2 0.012 8 0.011 4 0.000 7 75.5 12.1 73.0 4.7 21 111 129 0.86 0.068 6 0.015 8 0.011 3 0.000 7 67.4 15.0 72.4 4.6 22 155 186 0.83 0.076 5 0.010 6 0.011 1 0.000 7 74.9 10.0 71.4 4.7 23 121 141 0.86 0.077 9 0.016 3 0.011 2 0.000 6 76.2 15.3 72.0 3.6 24 254 302 0.84 0.071 1 0.010 8 0.011 3 0.000 5 69.8 10.2 72.7 3.0 表 2 样品PM022-14-N锆石U-Pb定年结果
Table 2. Zircon U-Pb dating results for sample PM022-14-N
分析点 含量(10-6) 同位素比值 年龄(Ma) Th U Th/U 207Pb/235U 1 σ 206Pb/238U 1 σ 207Pb/235U 1 σ 206Pb/238U 1 σ 1 297 232 1.28 0.044 3 0.008 6 0.010 2 0.000 4 44.1 8.3 65.6 2.8 2 343 337 1.02 0.066 0 0.008 5 0.010 8 0.000 4 64.9 8.1 69.2 2.3 3 97.4 135 0.72 0.040 6 0.008 5 0.010 6 0.000 6 40.4 8.3 68.0 3.7 4 277 251 1.10 0.069 3 0.010 7 0.010 9 0.000 4 68.0 10.2 69.6 2.8 5 72.7 150 0.48 0.905 0 0.059 0 0.102 2 0.002 4 654.4 31.5 627.2 13.9 6 490 487 1.01 0.099 8 0.009 1 0.014 7 0.000 4 96.6 8.4 94.2 2.8 7 839 929 0.90 0.066 7 0.006 5 0.013 1 0.000 3 65.6 6.1 84.2 2.0 8 155 226 0.69 0.070 0 0.008 4 0.010 7 0.000 6 68.7 7.9 68.7 3.8 9 762 503 1.52 0.063 4 0.007 3 0.010 6 0.000 3 62.4 6.9 68.2 2.0 10 587 543 1.08 0.081 5 0.010 0 0.010 3 0.000 6 79.5 9.4 65.9 3.8 11 479 415 1.15 0.076 4 0.011 3 0.011 2 0.000 4 74.7 10.7 71.8 2.4 12 223 452 0.49 0.107 1 0.012 9 0.015 5 0.001 0 103.3 11.8 99.1 6.3 13 165 215 0.77 0.066 7 0.016 0 0.010 9 0.000 8 65.5 15.2 69.7 4.8 14 1 170 672 1.74 0.067 4 0.009 0 0.011 2 0.000 4 66.2 8.6 71.6 2.4 15 187 231 0.81 0.072 4 0.013 2 0.011 0 0.000 7 71.0 12.5 70.8 4.3 16 1 025 738 1.39 0.020 9 0.004 3 0.002 0 0.000 1 21.1 4.3 12.8 0.8 17 438 1 035 0.42 0.231 4 0.014 5 0.034 0 0.000 7 211.3 12.0 215.8 4.3 18 320 248 1.29 0.655 1 0.041 6 0.082 1 0.001 7 511.6 25.5 508.5 9.9 19 178 207 0.86 0.640 1 0.057 4 0.087 5 0.002 1 502.4 35.6 540.7 12.5 20 1 072 746 1.44 0.078 2 0.006 6 0.010 9 0.000 3 76.4 6.2 69.9 2.1 21 756 622 1.22 0.079 7 0.014 1 0.011 1 0.000 5 77.8 13.3 71.1 3.4 22 765 590 1.30 0.076 6 0.010 6 0.010 8 0.000 4 74.9 10.0 69.3 2.5 23 153 210 0.73 0.065 7 0.010 5 0.011 0 0.000 6 64.6 10.0 70.5 4.0 24 617 426 1.45 0.076 5 0.014 5 0.011 0 0.000 5 74.8 13.7 70.6 3.4 表 3 样品PM022-17-N锆石U-Pb同位素定年结果
Table 3. Zircon U-Pb dating results for sample PM022-17-N
分析点 含量(10-6) 同位素比值 年龄(Ma) Th U Th/U 207Pb/235U 1 σ 206Pb/238U 1 σ 207Pb/235U 1 σ 206Pb/238U 1 σ 1 481 474 1.01 0.093 5 0.011 4 0.013 5 0.000 5 90.8 10.6 86.6 3.0 2 30.3 40.3 0.75 0.090 0 0.028 7 0.014 9 0.001 4 87.5 26.8 95.5 9.0 3 137 160 0.85 2.285 5 0.127 0 0.202 8 0.003 8 1 207.8 39.2 1 190.5 20.6 4 350 373 0.94 0.092 5 0.012 7 0.015 3 0.000 5 89.9 11.8 98.1 3.5 5 225 548 0.41 0.065 8 0.008 0 0.010 6 0.000 4 64.7 7.6 67.8 2.5 6 321 890 0.36 0.071 0 0.012 4 0.010 6 0.000 7 69.7 11.7 68.0 4.5 7 122 191 0.64 0.112 4 0.016 5 0.016 2 0.000 7 108.2 15.1 103.8 4.6 8 163 285 0.57 0.125 7 0.017 4 0.011 1 0.000 5 120.2 15.7 71.1 3.0 9 390 905 0.43 0.073 5 0.007 0 0.010 6 0.000 4 72.0 6.6 67.9 2.5 10 833 1 482 0.56 0.073 7 0.012 2 0.010 5 0.000 7 72.2 11.6 67.0 4.6 11 267 182 1.46 0.065 2 0.006 4 0.010 4 0.000 6 64.2 6.1 66.5 3.7 12 414 733 0.56 0.064 2 0.008 7 0.010 8 0.000 4 63.2 8.3 69.1 2.3 13 147 154 0.96 0.077 4 0.008 5 0.010 8 0.000 9 75.7 8.0 69.4 5.7 14 461 496 0.93 0.071 6 0.013 3 0.010 9 0.000 6 70.2 12.6 70.1 3.9 15 349 412 0.85 0.076 8 0.012 1 0.010 9 0.000 5 75.1 11.4 69.7 3.4 16 669 1 142 0.59 0.066 7 0.005 5 0.010 7 0.000 2 65.5 5.2 68.7 1.6 17 273 355 0.77 0.068 7 0.009 0 0.010 8 0.000 5 67.5 8.5 69.2 3.0 18 161 163 0.99 0.076 8 0.011 7 0.010 8 0.000 6 75.1 11.0 69.5 4.1 19 170 267 0.64 0.372 2 0.029 0 0.046 6 0.000 9 321.3 21.4 293.9 5.7 20 79.9 114 0.70 0.064 9 0.003 4 0.010 5 0.000 6 63.9 3.3 67.5 4.1 21 1 163 1 781 0.65 0.074 7 0.005 6 0.010 3 0.000 2 73.2 5.3 66.2 1.1 22 852 1 222 0.70 0.076 6 0.005 5 0.011 0 0.000 3 74.9 5.2 70.8 1.7 23 170 290 0.59 0.158 8 0.012 1 0.023 5 0.000 7 149.7 10.6 149.7 4.2 24 335 499 0.67 0.072 8 0.013 1 0.010 6 0.000 4 71.4 12.4 67.8 2.9 25 515 607 0.85 0.066 3 0.011 4 0.011 0 0.000 4 65.2 10.9 70.6 2.5 26 206 280 0.74 0.103 0 0.010 6 0.014 9 0.000 5 99.6 9.7 95.4 3.3 27 290 342 0.85 0.105 0 0.008 5 0.010 7 0.000 4 101.4 7.8 68.6 2.3 表 4 林子宗群火山岩锆石U-Pb年龄结果
Table 4. Zircon U-Pb dating results of Linzizong Group volcanic rocks
分带 采样点 岩性 岩组 年龄(Ma) 测试方法 参考文献 拉萨地块东段 林周盆地 流纹岩 典中组 68.7±2.4 锆石U-Pb He et al.(2007) 林周盆地 英安质凝灰岩 帕那组 43.9±1.4 锆石U-Pb He et al.(2007) 林周盆地 中钾玄武安山岩 典中组 64.43±0.57 40Ar-39Ar 周肃等(2004) 林周盆地 玄武安山岩 年波组 56.51±0.34 40Ar-39Ar 周肃等(2004) 林周盆地 高钾流纹岩 帕那组 43.93±0.37 40Ar-39Ar 周肃等(2004) 林周盆地 辉石安山岩 典中组 64.9±0.8 锆石U-Pb 陈贝贝等(2016) 林周盆地 黑云母安山岩 典中组 65.8±1.7 锆石U-Pb 陈贝贝等(2016) 林周盆地 辉石安山岩 典中组 66.0±0.9 锆石U-Pb 陈贝贝等(2016) 林周盆地 沉凝灰岩 年波组 54.6±1.2 锆石U-Pb 陈贝贝等(2016) 林周盆地 玻屑凝灰岩 年波组 55.7±0.8 锆石U-Pb 陈贝贝等(2016) 林周盆地 安山玢岩 帕那组 53.5±0.8 锆石U-Pb 陈贝贝等(2016) 林周盆地 典中组 63.9±0.7 锆石U-Pb Huang et al.(2015) 林周盆地 凝灰岩 帕那组 50.5±2.4 锆石U-Pb Ding et al.(2014) 林周盆地 凝灰岩 帕那组 48.4±1.0 锆石U-Pb Ding et al.(2014) 拉萨地块中段 措麦地区 凝灰岩 年波组 70~65 锆石U-Pb 于枫等(2010) 朱诺地区 流纹质岩屑晶屑凝灰岩 典中组 64.8±1.6 锆石U-Pb 梁银平等(2010) 朱诺地区 英安质岩屑晶屑凝灰岩 年波组 59.7±1.8 锆石U-Pb 梁银平等(2010) 朱诺地区 流纹质玻屑晶屑凝灰岩 帕那组 48.9±0.8 锆石U-Pb 梁银平等(2010) 丁仁勒地区 安山质晶屑凝灰岩 典中组 69.97±0.72 锆石SHRIMP 谢冰晶等(2013) 孔隆地区 英安质熔结凝灰岩 年波组 59.64±0.72 锆石SHRIMP 谢冰晶等(2013) 赤马地区 英安质晶屑岩屑角砾岩 年波组 64.58±0.66 锆石U-Pb 丁枫等(2017) 拉萨地块西段 狮泉河 流纹岩 典中组 64.25±0.91 锆石U-Pb 王乔林(2011) 狮泉河 流纹岩 典中组 64.52±0.48 锆石U-Pb 王乔林(2011) 狮泉河 流纹岩 帕那组 53.9±0.5 锆石U-Pb 付文春等(2014) -
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