Zircon U-Pb age and Hf isotopes of the biotite plagioclase genesis in Duobagou area, Gansu Province
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摘要:
通过对多坝沟地区敦煌杂岩中黑云斜长片麻岩LA-ICP-MS锆石U-Pb年龄和Lu-Hf同位素的研究,对敦煌杂岩的形成时代和敦煌地块的前寒武纪地壳生长演化进行探讨。锆石U-Pb年代学研究表明,710Ma代表了敦煌杂岩的最大沉积时代,黑云斜长片麻岩发育422Ma的早古生代变质事件,表明敦煌地块卷入了早古生代古亚洲洋俯冲-碰撞的演化过程。锆石Hf同位素研究结果表明,敦煌地块具有幕式生长特征,经历了约2.7Ga、2.5Ga、2.3Ga、2.0Ga和1.8Ga多个地壳生长时期。黑云斜长片麻岩发育的约0.9Ga和约0.8Ga的峰值年龄表明,敦煌地块新元古代构造热事件可与塔里木克拉通对比。
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关键词:
- 多坝沟 /
- 敦煌杂岩 /
- 碎屑锆石U-Pb年龄 /
- 锆石Lu-Hf同位素
Abstract:The LA-ICP-MS zircon U-Pb age and zircon Lu-Hf isotope were analyzed for biotite-plagioclase gneiss from Duoba-gou area, Dunhuang terrain, with the purpose of determining the formation age of the Dunhuang complex and discussing the crustal growth and evolution history of the Dunhuang terrain during Precambrian. Zircon U-Pb dating results indicate that the maximum depositional age of supracrustal rocks from the Dunhuang complex is ca. 710Ma. Additionally, the studied biotite-plagioclase gneiss indicates a metamorphic event at 422Ma, suggesting that the Precambrian Dunhuang terrain might have been involved in the subduc-tion-collision process of the Paleo-Asian Ocean during Early Paleozoic. Zircon Hf isotopes show that the Dunhuang terrain experi-enced episodic crustal growth events at ca. 2.7Ga, ca.2.5Ga, ca. 2.3Ga, ca. 2.0Ga and ca. 1.8Ga, suggesting episodic crustal growth. It is considered that the tectonic attribute could be compared with that of the Tarim craton during Neoproterozoic, as shown by the peak age at ca. 0.9Ga and ca. 0.8Ga.
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Keywords:
- Duobagou area /
- Dunhuang complex /
- detrital zircon U-Pb age /
- zircon Lu-Hf isotope
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致谢: 样品测试过程中得到了西北大学大陆动力国家重点实验室第五春荣、戴梦宁、张红等老师的大力帮助,成文过程得到中国地质调查局西安地质调查中心孙吉明、李平工程师的帮助,在此一并表示感谢。
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表 1 黑云斜长片麻岩LA-ICP-MS锆石U-Th-Pb同位素测试数据
Table 1 LA-ICP-MS zircon U-Th-Pb analytical data of biotite-plagioclase gneiss
测点号 比值 年龄/Ma 含量/10-6 Th/U Pb207/Pb206 1σ Pb207/U235 1σ Pb206/U238 1σ Pb208/Th232 1σ Pb207/Pb206 1σ Pb206/U238 1σ Pb208/Th232 1σ Th232 U238 09-4-2-01 0.12465 0.00287 6.44475 0.10097 0.37491 0.00451 0.10784 0.00134 2023.8 40.21 2052.5 21.15 2070 24.43 196.01 557.65 0.35 09-4-2-02 0.12510 0.00302 6.55485 0.11238 0.37994 0.00468 0.10511 0.00146 2030.2 42.12 2076 21.88 2020.2 26.73 115.56 173.71 0.67 09-4-2-03 0.13556 0.00297 6.44071 0.09108 0.34453 0.00406 0.10425 0.00111 2171.2 37.7 1908.4 19.47 2004.4 20.32 302.31 760 0.40 09-4-2-04 0.12888 0.00294 6.43490 0.09880 0.36206 0.00434 0.11058 0.00137 2082.7 39.56 1991.9 20.55 2119.9 25 146.92 248.15 0.59 09-4-2-05 0.13361 0.00302 6.50991 0.09813 0.35330 0.00422 0.10191 0.00113 2146 38.94 1950.3 20.13 1961.5 20.82 118.13 391.93 0.30 09-4-2-06 0.13518 0.00292 6.60636 0.09077 0.35438 0.00415 0.10921 0.00111 2166.3 37.23 1955.5 19.75 2094.9 20.3 301.35 387.01 0.78 09-4-2-07 0.12596 0.00363 6.35668 0.14491 0.36595 0.00498 0.09875 0.00166 2042.3 50.1 2010.3 23.5 1903.5 30.59 232.47 340.95 0.68 09-4-2-08 0.12922 0.00309 6.72697 0.11323 0.37750 0.00464 0.10843 0.00138 2087.3 41.45 2064.6 21.72 2080.8 25.23 138.15 226.73 0.61 09-4-2-09 0.08332 0.00200 2.44812 0.04179 0.21305 0.00254 0.06420 0.00070 1276.6 46.21 1245 13.52 1257.6 13.22 323.92 453.84 0.71 09-4-2-10 0.12580 0.00341 6.50252 0.13519 0.37481 0.00492 0.11080 0.00189 2040.1 47.16 2052 23.07 2124 34.46 89.48 158.91 0.56 09-4-2-11 0.12920 0.00325 6.69396 0.12318 0.37570 0.00474 0.11417 0.00160 2087.1 43.57 2056.2 22.23 2185.2 29.05 147.77 255.17 0.58 09-4-2-12 0.12643 0.00282 6.51552 0.09564 0.37370 0.00443 0.11067 0.00128 2048.9 38.85 2046.8 20.79 2121.6 23.26 126.56 201.54 0.63 09-4-2-13 0.20171 0.00438 10.27964 0.14133 0.36954 0.00440 0.11636 0.00254 2840.1 34.95 2027.2 20.71 2224.8 46.01 45.12 454.94 0.10 09-4-2-14 0.07727 0.00176 1.52452 0.02357 0.14306 0.00167 0.04820 0.00074 1128.2 44.75 862 9.44 951.5 14.27 158.65 1104.93 0.14 09-4-2-15 0.05722 0.00209 0.55137 0.01757 0.06987 0.00094 0.02201 0.00052 499.6 79.07 435.4 5.65 440 10.22 119.6 354.49 0.34 09-4-2-16 0.05687 0.00214 0.54224 0.01792 0.06914 0.00094 0.02127 0.00055 485.8 81.67 431 5.66 425.4 10.9 86.81 308.82 0.28 09-4-2-17 0.25464 0.00527 17.12490 0.21077 0.48766 0.00566 0.15081 0.00187 3213.8 32.31 2560.6 24.52 2839.2 32.81 157.35 373.17 0.42 09-4-2-18 0.05790 0.00226 0.53224 0.01842 0.06666 0.00092 0.02136 0.00056 525.5 83.8 416 5.58 427.2 11.11 113.7 382.78 0.30 09-4-2-19 0.05649 0.00378 0.50964 0.03217 0.06542 0.00123 0.02058 0.00106 470.9 142.19 408.5 7.42 411.7 21.04 101.74 374.03 0.27 09-4-2-20 0.05744 0.00304 0.51209 0.02509 0.06464 0.00105 0.02019 0.00073 508.1 112.69 403.8 6.33 404 14.41 162.59 164.83 0.99 09-4-2-21 0.07241 0.00190 1.63795 0.03280 0.16404 0.00200 0.05008 0.00071 997.4 52.52 979.2 11.09 987.7 13.75 191.88 513.46 0.37 09-4-2-22 0.16479 0.00533 8.68040 0.22990 0.38197 0.00589 0.11132 0.00278 2505.4 53.43 2085.5 27.45 2133.3 50.53 57.45 97.47 0.59 09-4-2-23 0.05531 0.00159 0.52478 0.01210 0.06880 0.00084 0.02124 0.00032 425.1 62.03 428.9 5.09 424.7 6.28 404 872.55 0.46 09-4-2-24 0.05593 0.00287 0.53808 0.02548 0.06976 0.00110 0.02826 0.00135 449.1 110.31 434.7 6.61 563.3 26.6 27.63 103.49 0.27 09-4-2-25 0.07350 0.00364 1.38773 0.06288 0.13692 0.00228 0.03863 0.00070 1027.7 97.1 827.2 12.94 766.2 13.61 77.69 299.14 0.26 09-4-2-26 0.05585 0.00224 0.51034 0.01822 0.06626 0.00092 0.02070 0.00056 446.2 86.57 413.6 5.57 414 11.05 78.39 280.64 0.28 09-4-2-27 0.05516 0.00302 0.50563 0.02576 0.06647 0.00109 0.01956 0.00073 418.6 117.43 414.9 6.57 391.6 14.53 141.06 410.06 0.34 09-4-2-28 0.05489 0.00212 0.49710 0.01698 0.06567 0.00090 0.01971 0.00048 407.8 83.68 410 5.42 394.6 9.46 79.96 281.43 0.28 09-4-2-29 0.14240 0.00854 4.30952 0.23508 0.21945 0.00524 0.07573 0.00452 2256.6 100.04 1279 27.68 1475.4 85.02 17.74 42.16 0.42 09-4-2-30 0.16591 0.00374 10.79940 0.16162 0.47200 0.00572 0.13195 0.00163 2516.8 37.39 2492.3 25.04 2505.1 29.11 285.08 405.2 0.70 09-4-2-31 0.06616 0.00311 1.29303 0.05542 0.14172 0.00223 0.04206 0.00072 811.4 95.41 854.4 12.58 832.7 13.99 136.64 91.46 1.49 09-4-2-32 0.11213 0.00318 5.05660 0.11295 0.32700 0.00433 0.09068 0.00172 1834.2 50.55 1823.8 21.04 1754.5 31.93 54.66 126.02 0.43 09-4-2-33 0.11297 0.00273 4.90466 0.08443 0.31481 0.00385 0.08943 0.00129 1847.8 43.1 1764.3 18.87 1731.3 23.91 84.77 180.83 0.47 09-4-2-34 0.07366 0.00293 1.63652 0.05744 0.16109 0.00236 0.04700 0.00117 1032.3 78.27 962.8 13.12 928.2 22.62 71 458.01 0.16 09-4-2-35 0.07691 0.00329 1.70977 0.06535 0.16121 0.00249 0.05027 0.00143 1118.8 82.97 963.5 13.8 991.3 27.45 46.33 334.66 0.14 09-4-2-36 0.07016 0.00196 1.40141 0.03074 0.14483 0.00180 0.04318 0.00089 933.1 56.15 871.9 10.13 854.4 17.21 51.48 399.04 0.13 09-4-2-37 0.07353 0.00244 1.66026 0.04644 0.16372 0.00219 0.04839 0.00118 1028.7 65.6 977.4 12.15 955.1 22.8 67.39 199 0.34 09-4-2-38 0.06403 0.00263 1.02776 0.03774 0.11639 0.00168 0.03502 0.00062 742.6 84.68 709.8 9.71 695.8 12.05 173.51 248.47 0.70 09-4-2-39 0.18938 0.00468 11.77300 0.20784 0.45078 0.00586 0.12170 0.00177 2736.8 40.06 2398.7 26.02 2321.3 31.93 116.33 161.34 0.72 09-4-2-40 0.16436 0.00372 6.32886 0.09512 0.27922 0.00337 0.11537 0.00314 2501 37.59 1587.4 16.98 2207 56.99 30.5 370.41 0.08 09-4-2-41 0.07080 0.00237 1.63194 0.04619 0.16714 0.00224 0.04917 0.00063 951.7 66.91 996.3 12.35 970.1 12.22 219.91 164.03 1.34 09-4-2-42 0.07262 0.00200 1.69077 0.03644 0.16882 0.00210 0.04981 0.00080 1003.5 54.62 1005.6 11.56 982.4 15.34 186.45 354.5 0.53 09-4-2-43 0.07301 0.00244 1.69365 0.04790 0.16820 0.00226 0.04784 0.00130 1014.4 66.28 1002.2 12.48 944.5 25.11 199.98 352.58 0.57 09-4-2-44 0.05623 0.00204 0.53523 0.01687 0.06902 0.00092 0.02119 0.00048 460.8 78.5 430.2 5.55 423.8 9.55 139.37 446.68 0.31 09-4-2-45 0.18596 0.00646 12.98249 0.37670 0.50624 0.00858 0.13595 0.00432 2706.7 56.2 2640.6 36.74 2576.5 76.8 30.58 128.04 0.24 09-4-2-46 0.07034 0.00199 1.59914 0.03584 0.16485 0.00206 0.05183 0.00082 938.3 56.89 983.7 11.4 1021.4 15.83 138.34 399.99 0.35 09-4-2-47 0.17181 0.00376 9.84696 0.13856 0.41558 0.00495 0.11806 0.00154 2575.4 36.13 2240.4 22.53 2255.6 27.77 110.77 266.9 0.42 09-4-2-48 0.07006 0.00321 1.35679 0.05629 0.14043 0.00221 0.04589 0.00095 930 91.25 847.1 12.47 906.8 18.36 67.18 281.18 0.24 09-4-2-49 0.05846 0.00205 0.54689 0.01648 0.06783 0.00090 0.02923 0.00153 547.2 74.64 423.1 5.41 582.4 30.04 47.99 351.22 0.14 09-4-2-50 0.05538 0.00204 0.51995 0.01676 0.06808 0.00091 0.02045 0.00047 427.2 80.02 424.6 5.51 409.2 9.31 154.88 489.35 0.32 09-4-2-51 0.05631 0.00247 0.53689 0.02125 0.06913 0.00100 0.02107 0.00062 463.9 94.93 430.9 6.05 421.4 12.22 118.13 391.93 0.30 09-4-2-52 0.05514 0.00235 0.51106 0.01963 0.06721 0.00096 0.02013 0.00051 417.8 92.29 419.3 5.8 402.9 10.2 196.01 557.65 0.35 表 2 黑云斜长片麻岩Hf同位素组成
Table 2 Analytical data of zircon Hf isotope composition of biotite-plagioclase gneiss
测点号 年龄/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf (176Hf/177Hf)i 2σ εHf(0) εHf(t) TDM1 TDM2 fLu/Hf 09-4-2-2 2030 0.012233 0.000341 0.281447 0.281434 0.000036 -47.33 -2.50 2497 2786 -0.99 09-4-2-3 2171 0.014274 0.000390 0.281643 0.281627 0.000028 -40.51 7.48 2240 2283 -0.99 09-4-2-4 2083 0.012453 0.000354 0.281600 0.281586 0.000039 -41.94 4.08 2293 2423 -0.99 09-4-2-5 2166 0.022294 0.000602 0.281662 0.281638 0.000035 -40.12 7.44 2238 2281 -0.98 09-4-2-6 2042 0.020220 0.000554 0.281646 0.281625 0.000040 -40.57 4.27 2252 2380 -0.98 09-4-2-7 2087 0.014410 0.000406 0.281585 0.281569 0.000041 -42.55 3.49 2319 2462 -0.99 09-4-2-8 1277 0.034685 0.000918 0.282166 0.282144 0.000030 -22.21 5.31 1558 1725 -0.97 09-4-2-9 2040 0.009860 0.000279 0.281441 0.281430 0.000033 -47.45 -2.31 2498 2782 -0.99 09-4-2-10 2049 0.012387 0.000374 0.281429 0.281414 0.000041 -48.01 -2.81 2525 2820 -0.99 09-4-2-11 2087 0.011805 0.000335 0.281581 0.281568 0.000040 -42.58 3.56 2316 2458 -0.99 09-4-2-13 862 0.012118 0.000249 0.281981 0.281977 0.000028 -28.12 -9.26 1758 2317 -0.99 09-4-2-14 435 0.031385 0.000886 0.282506 0.282499 0.000030 -9.65 -0.34 1062 1435 -0.97 09-4-2-15 3214 0.024149 0.000684 0.280779 0.280737 0.000025 -71.96 -0.93 3455 3600 -0.98 09-4-2-17 416 0.035248 0.001013 0.282668 0.282660 0.000029 -3.96 4.91 838 1088 -0.97 09-4-2-19 409 0.027751 0.000770 0.282613 0.282607 0.000031 -5.82 2.96 907 1206 -0.98 09-4-2-20 404 0.020286 0.000545 0.282163 0.282158 0.000025 -21.70 -12.98 1523 2206 -0.98 09-4-2-21 979 0.038970 0.001027 0.282316 0.282297 0.000023 -16.79 4.18 1349 1567 -0.97 09-4-2-22 2505 0.002344 0.000049 0.281426 0.281424 0.000040 -47.68 8.44 2492 2483 -1.00 09-4-2-24 435 0.016689 0.000452 0.282220 0.282216 0.000034 -19.67 -10.24 1440 2058 -0.99 09-4-2-25 827 0.019086 0.000558 0.282165 0.282156 0.000048 -21.77 -3.83 1526 1952 -0.98 09-4-2-26 414 0.024436 0.000700 0.282478 0.282473 0.000035 -10.57 -1.67 1093 1503 -0.98 09-4-2-27 415 0.033856 0.000941 0.282725 0.282717 0.000031 -1.93 6.94 756 959 -0.97 09-4-2-28 2257 0.052166 0.001402 0.281675 0.281615 0.000031 -40.92 7.46 2316 2350 -0.96 09-4-2-29 410 0.021766 0.000584 0.282783 0.282779 0.000026 0.23 9.09 664 818 -0.98 09-4-2-30 2517 0.038110 0.001126 0.281479 0.281424 0.000034 -47.66 6.90 2561 2587 -0.97 09-4-2-31 854 0.013956 0.000382 0.282324 0.282318 0.000032 -16.07 2.57 1298 1572 -0.99 09-4-2-32 1834 0.010011 0.000271 0.281497 0.281488 0.000027 -45.41 -4.91 2420 2784 -0.99 09-4-2-33 1848 0.023634 0.000604 0.281847 0.281826 0.000025 -33.45 7.00 1981 2062 -0.98 09-4-2-34 963 0.030647 0.000863 0.282092 0.282076 0.000044 -24.60 -3.89 1649 2059 -0.97 09-4-2-35 964 0.028223 0.000813 0.282280 0.282265 0.000047 -17.93 2.85 1386 1638 -0.98 09-4-2-37 977 0.022406 0.000549 0.282342 0.282332 0.000028 -15.55 5.69 1283 1470 -0.98 09-4-2-38 872 0.011952 0.000337 0.282364 0.282358 0.000030 -14.63 4.43 1240 1469 -0.99 09-4-2-39 2737 0.015357 0.000416 0.281174 0.281152 0.000033 -57.30 3.44 2880 2968 -0.99 09-4-2-41 996 0.012917 0.000328 0.281822 0.281816 0.000032 -33.82 -12.05 1981 2591 -0.99 09-4-2-43 1014 0.055249 0.001306 0.282481 0.282456 0.000026 -11.17 10.38 1134 1204 -0.96 09-4-2-44 430 0.038066 0.001041 0.282825 0.282817 0.000031 1.58 10.75 618 728 -0.97 09-4-2-45 2707 0.019976 0.000546 0.281315 0.281287 0.000053 -52.51 7.33 2708 2708 -0.98 09-4-2-46 984 0.031931 0.000781 0.282362 0.282348 0.000026 -15.00 6.25 1269 1441 -0.98 09-4-2-50 2575 0.025940 0.000736 0.281294 0.281258 0.000027 -53.53 2.96 2760 2872 -0.98 09-4-2-51 847 0.020067 0.000562 0.282301 0.282292 0.000075 -16.96 1.42 1339 1639 -0.98 09-4-2-53 423 0.018808 0.000532 0.282543 0.282539 0.000034 -8.25 0.90 997 1347 -0.98 09-4-2-55 425 0.032210 0.000885 0.282700 0.282693 0.000032 -2.78 6.32 789 1006 -0.97 09-4-2-54 431 0.039267 0.001092 0.282782 0.282773 0.000033 0.04 9.22 680 827 -0.97 -
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