Geochronological Evidence of Ordovician and Jurassic Magmatic Events in Nyainrong Microcontinent, Tibet
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摘要: 为了加深对班公湖-怒江缝合带构造演化过程的认识,选择聂荣微陆块内的花岗质片麻岩和花岗闪长质片麻岩中的锆石进行LA-ICP-MS U-Pb定年,结果主要显示两组206Pb/238U的加权平均年龄:一组为453.7±2.5 Ma; 另一组为176.6±1.1 Ma和178.04±0.8 Ma.花岗质片麻岩中黑云母和花岗闪长质片麻岩中白云母的40Ar-39Ar定年结果显示,坪年龄分别为161.8±1.1 Ma和178.9±1.2 Ma.上述年龄结果表明,聂荣微陆块主要经历了晚奥陶世和早侏罗世两期岩浆事件,这两期岩浆事件分别与冈瓦纳大陆北缘早古生代的造山作用和班公湖-怒江洋壳的俯冲闭合存在密切的动力学关系.Abstract: In order to deepen our knowledge and understanding about the tectonic evolution of the Bangonghu-Nujiang suture zone(BNS), zircon U-Pb dating was conducted for granitic gneiss and granodioritic gneiss of Nyainrong microcontinent by LA-ICP-MS in this study. Results show two groups of average zircon U-Pb ages, with one of 453.7±2.5 Ma, and the other of 176.6±1.1 Ma and 178.04±0.8 Ma. 40Ar-39Ar dating was conducted for biotite from granitic gneiss and muscovite from granodioritic gneiss in Nyainrong microcontinent.The 40Ar-39Ar plateau ages yield 161.8±1.1 Ma and 178.9±1.2 Ma, respectively, showing that the study area experienced the Late Ordovician and the Early Jurassic magmatic events. Combined with field condition and study results, it is suggested that the Ordovician magmatic event was related to the Early Paleozoic orogeny which could be caused by proto-Tethyan oceanic subduction along Gondwana continental margin, and the Jurassic magmatic event was related to the subduction and closure of the Bangong-Nujiang oceanic crust.
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图 1 青藏高原地质简图
MBT.主边界断裂; YZS.雅鲁藏布江缝合带; BNS.班公湖-怒江缝合带; HJS.可可西里-金沙江缝合带; SKS.昆南缝合带; KJF.喀喇昆仑-嘉黎断裂; JSF.金沙江断裂; XSF.鲜水河断裂; EKF.东昆仑断裂.据吴珍汉等(2009)修改
Fig. 1. Geological sketch map of the Tibetan Plateau
表 1 聂荣微陆块片麻岩LA-ICP-MS锆石U-Pb同位素测年结果
Table 1. LA-ICP-MS data of zircons from gneisses in Nyainrong microcontinent
点号 Th/U 同位素比值 年龄(Ma) 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 花岗质片麻岩(样品B06) 1 0.106 1 0.027 0 0.000 2 0.185 0 0.002 1 0.049 8 0.000 5 171.8 1.2 172.4 1.8 2 2.136 5 0.072 9 0.000 4 0.597 9 0.005 0 0.059 5 0.000 4 453.4 2.6 475.9 3.2 3 5.476 5 0.014 2 0.000 1 0.434 8 0.003 4 0.222 9 0.001 2 90.6 0.6 366.6 2.4 4 1.373 9 0.064 2 0.000 3 0.502 5 0.003 6 0.056 8 0.000 3 400.9 2.0 413.4 2.5 5 0.228 7 0.028 1 0.000 1 0.197 5 0.001 2 0.051 1 0.000 2 178.4 0.8 183.0 1.1 6 1.353 6 0.073 0 0.000 7 0.584 4 0.005 9 0.058 1 0.000 3 454.0 4.2 467.3 3.8 7 0.635 9 0.028 3 0.000 1 0.204 8 0.003 4 0.0525 0.000 9 180.0 0.9 189.2 2.9 8 1.092 7 0.072 6 0.000 4 0.569 2 0.003 6 0.056 9 0.000 2 451.5 2.4 457.5 2.3 9 2.226 1 0.022 4 0.000 0.190 4 0.009 6 0.061 5 0.002 9 143.0 1.6 177.0 8.2 10 0.456 7 0.073 4 0.000 6 0.577 0 0.007 7 0.057 0 0.000 6 456.7 3.5 462.5 5.0 11 1.407 4 0.073 6 0.000 7 0.585 5 0.006 0 0.057 8 0.000 3 457.7 4.2 468.0 3.8 12 0.143 4 0.027 7 0.000 2 0.191 7 0.001 8 0.050 3 0.000 4 176.0 0.9 178.1 1.6 13 6.093 1 0.043 9 0.000 2 0.433 8 0.002 7 0.071 7 0.000 3 276.8 1.2 365.9 1.9 14 0.150 4 0.038 2 0.000 3 0.281 8 0.004 3 0.053 5 0.000 6 241.5 1.8 252.1 3.4 15 0.168 7 0.028 2 0.000 1 0.196 1 0.001 2 0.050 4 0.000 2 179.5 0.8 181.9 1.0 16 0.160 4 0.027 8 0.000 1 0.190 6 0.001 1 0.049 8 0.000 1 176.7 0.9 177.1 0.9 17 0.717 5 0.028 3 0.001 0 0.204 6 0.006 8 0.052 5 0.000 4 179.8 6.6 189.0 5.7 18 0.165 9 0.027 7 0.000 1 0.189 1 0.001 1 0.049 6 0.000 2 175.9 0.7 175.8 0.9 19 0.650 2 0.028 1 0.000 3 0.196 9 0.002 2 0.050 9 0.000 6 178.5 2.1 182.5 1.9 20 1.678 9 0.027 9 0.000 6 0.201 7 0.004 4 0.052 4 0.001 2 177.6 3.7 186.6 3.7 21 0.164 2 0.027 5 0.000 2 0.189 9 0.001 5 0.050 0 0.000 3 175.2 1.0 176.5 1.2 22 1.394 4 0.072 8 0.000 6 0.595 5 0.004 6 0.059 5 0.000 3 453.1 3.6 474.3 2.9 23 5.921 5 0.047 9 0.000 5 0.478 9 0.007 5 0.072 6 0.000 8 301.8 3.3 397.3 5.1 花岗闪长质片麻岩(样品B65) 1 0.290 3 0.066 5 0.000 7 6.080 7 0.057 1 0.663 7 0.002 5 415.0 4.2 1 987.5 8.2 2 1.984 8 0.075 9 0.001 6 6.345 5 0.189 1 0.599 3 0.006 1 471.4 9.8 2 024.8 26.1 3 5.887 7 0.028 2 0.000 5 1.803 3 0.026 0 0.466 4 0.003 4 179.2 3.3 1 046.7 9.4 4 3.381 7 0.028 0 0.000 2 0.198 8 0.002 7 0.051 5 0.000 6 178.2 1.2 184.1 2.3 5 3.136 8 0.029 8 0.000 2 1.361 2 0.012 2 0.331 1 0.002 4 189.4 1.0 872.4 5.3 6 0.433 3 0.028 2 0.000 2 0.202 2 0.002 2 0.052 0 0.000 5 179.5 1.1 187.0 1.9 7 0.701 5 0.081 7 0.000 4 0.656 0 0.004 1 0.058 2 0.000 2 506.2 2.5 512.2 2.5 8 2.606 6 0.059 5 0.000 8 4.638 2 0.062 8 0.565 1 0.001 7 372.7 4.9 1 756.2 11.3 9 0.435 2 0.027 7 0.000 2 0.198 1 0.003 9 0.051 7 0.000 9 176.4 1.1 183.5 3.3 10 2.440 3 0.028 0 0.000 2 1.977 5 0.013 4 0.511 6 0.002 3 178.3 1.2 1 107.9 4.6 11 1.898 1 0.028 1 0.000 1 0.195 6 0.002 2 0.050 5 0.000 5 178.5 0.9 181.4 1.8 12 3.116 1 0.028 2 0.000 3 0.670 7 0.010 1 0.173 3 0.003 0 179.0 1.6 521.2 6.2 13 2.409 7 0.031 6 0.000 5 1.141 4 0.022 6 0.261 4 0.002 3 200.9 3.3 773.2 10.7 14 1.628 7 0.057 7 0.001 8 5.065 0 0.160 7 0.636 9 0.002 4 361.4 11.0 1 830.3 26.9 15 0.508 0 0.027 9 0.000 1 0.201 5 0.001 0 0.052 3 0.000 1 177.6 0.8 186.4 0.8 16 0.038 6 0.027 8 0.000 3 0.190 7 0.002 2 0.049 7 0.000 3 176.9 1.7 177.2 1.9 17 5.200 0 0.032 2 0.000 7 2.626 7 0.038 4 0.595 4 0.005 4 204.2 4.2 1 308.1 10.7 18 2.416 2 0.028 1 0.000 2 0.192 4 0.001 8 0.049 7 0.000 3 178.5 1.2 178.7 1.5 19 1.052 8 0.108 8 0.001 6 5.329 5 0.256 1 0.333 7 0.012 4 665.7 9.5 1 873.6 41.1 20 5.160 5 0.101 0 0.001 5 9.157 6 0.178 8 0.652 4 0.003 7 620.4 9.1 2 353.9 17.9 21 0.428 9 0.025 2 0.001 1 0.933 2 0.055 8 0.480 7 0.214 2 160.7 6.7 669.3 29.3 22 3.723 9 0.040 9 0.009 5 2.533 3 0.110 0 0.594 3 0.014 6 258.2 58.8 1 281.6 31.6 表 2 聂荣微陆块花岗质片麻岩黑云母和花岗闪长质片麻岩白云母常规40Ar/39Ar测年结果
Table 2. Conventionally 40Ar/39Ar isotopic age analyses of biotite and muscovite
T(℃) (40Ar/39Ar)m (36Ar/39Ar)m (37Ar/39Ar)m (38Ar/39Ar)m 40Ar(%) F 39Ar(10-14 mol) 39Ar(Cum.)(%) Age(Ma) ±1(Ma) 样品B06(花岗质片麻岩)黑云母W=28.03 mg J=0.004 267 700 56.020 7 0.151 9 8.741 9 0.043 7 20.96 11.8233 0.19 0.49 88.8 2.8 750 26.404 5 0.016 4 0.269 1 0.016 0 81.69 21.574 1 3.33 9.06 158.9 1.5 790 23.095 3 0.002 7 0.154 6 0.013 3 96.55 22.300 6 6.08 24.73 164.0 1.6 830 22.700 9 0.001 3 0.276 4 0.013 0 98.32 22.323 5 6.21 40.73 164.1 1.6 870 22.721 8 0.001 6 0.181 9 0.013 1 97.95 22.259 1 2.84 48.04 163.7 1.6 910 22.990 2 0.003 9 0.858 4 0.013 4 95.21 21.903 0 1.64 52.27 161.2 1.6 950 22.954 2 0.004 7 0.658 3 0.013 4 94.15 21.622 3 1.47 56.05 159.2 1.6 1 000 22.579 1 0.002 9 0.373 0 0.013 6 96.28 21.746 7 3.13 64.13 160.1 1.5 1 050 22.627 6 0.001 5 0.237 2 0.013 1 98.04 22.188 1 5.89 79.31 163.2 1.6 1 080 26.087 2 0.014 8 0.254 4 0.015 2 83.24 21.718 6 3.37 87.99 159.9 1.5 1 120 23.158 5 0.003 1 0.181 3 0.013 2 96.13 22.265 0 3.91 98.07 163.7 1.6 1 400 126.013 0 0.410 7 1.920 1 0.084 4 3.79 4.789 6 0.75 100.00 36.5 1.1 样品B665(花岗闪长质片麻岩)白云母W=27.40 mg J=0.004 301 700 20.958 2 0.015 6 6.004 6 0.015 3 80.03 16.853 6 0.22 0.56 126.2 2.9 750 22.734 0 0.004 2 1.643 3 0.013 2 95.02 21.630 0 0.71 2.39 160.5 1.7 800 23.079 3 0.002 2 1.306 9 0.012 8 97.62 22.554 9 1.43 6.07 167.0 1.6 850 23.584 9 0.001 6 0.723 0 0.012 7 98.24 23.183 9 2.40 12.27 171.5 1.7 890 24.330 9 0.001 6 0.235 4 0.012 8 98.05 23.861 3 4.47 23.79 176.2 1.7 930 24.430 3 0.000 7 0.082 3 0.012 6 99.17 24.229 6 4.82 36.21 178.8 1.7 970 24.757 4 0.001 1 0.345 5 0.012 6 98.81 24.470 2 4.77 48.52 180.5 1.7 1 010 24.624 2 0.001 1 0.156 1 0.012 6 98.69 24.304 2 2.68 55.42 179.4 1.7 1 050 24.713 4 0.001 4 0.376 0 0.012 8 98.43 24.332 2 4.11 66.03 179.6 1.7 1 090 24.616 5 0.001 2 0.253 1 0.012 7 98.60 24.276 7 6.55 82.92 179.2 1.7 1 130 24.592 5 0.000 8 0.234 4 0.012 5 99.11 24.379 0 6.16 98.81 179.9 1.7 1 180 26.853 2 0.010 5 3.263 8 0.012 7 89.30 24.044 0 0.39 99.81 177.5 2.0 1 400 75.442 2 0.210 9 24.901 3 0.050 8 19.74 15.195 3 0.07 100.00 114.2 7.0 注:W.实验参数; J.照射参数. -
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