U-Pb age and Hf isotope composition of detrital zircons from the Chengjiang Formation in Dongchuan area, Yunnan Province of the western Yangtze Block and its constraints on provenance and crustal evolution
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摘要:
澄江组是晋宁不整合面之上最早沉积的地层之一，了解其物源对于认识扬子西缘早期地壳演化具有重要意义。对扬子西缘东川地区澄江组底部碎屑锆石进行了U-Pb定年和Lu-Hf同位素分析。结果显示，澄江组碎屑锆石的年龄谱具有780~900 Ma、约1000 Ma、约1800 Ma的峰值，最年轻一组碎屑锆石年龄加权平均值为801±5 Ma（MSWD=2.4，n=9），与区内澄江组底部火山岩的年龄十分接近，限定研究区澄江组的沉积下限为约800 Ma。综合碎屑锆石U-Pb年龄和Hf同位素组成、锆石形态及古地理特征，认为东川地区澄江组底部的物源主要来自于扬子地块西缘新元古代岩浆岩的剥蚀，其次为东川群的沉积再循环。通过扬子地块南华纪早期地层的区域对比发现，扬子西缘与北缘在新元古代之前可能具有不同的地壳演化历史。扬子西缘不同地区澄江组之间存在物源差异，与区域构造活动密切相关。
Abstract:The Chengjiang Formation is one of the earliest stratigraphic units above the Jinning unconformity.Determining the sources is of great significance for the understanding of the early crustal evolution in the western Yangtze Block.U-Pb dating and Lu-Hf isotopic composition studies were carried out on the detrital zircons from the Lower Chengjiang Formation in the Dongchuan area of the western Yangtze Block.The U-Pb ages of the zircons are clustered at 780~900 Ma, ~1000 Ma and~1800 Ma respectively, and the weighted mean age of the youngest group is 801±5 Ma(MSWD=2.4, n=9), which is consistent with the volcanic age of the Lower Chengjiang Formation.Thus, it is further confirmed that the lower age of the Chengjiang Formation should be limited at~800 Ma.Combined with the U-Pb age and Hf isotopic composition, zircon morphology and paleogeography, it is believed that the detritus was largely sourced from the widely distributed Neoproterozoic magmatic rock in the western Yangtze Block, and a small part from the recycled materials of the Dongchuan Group.Regional comparison of the early Nanhua strata of the Yangtze Block indicates that the western and northern margins of the Yangtze Block show different crustal evolution history.The provenance differences of the Chengjiang Formation in different regions of the western margin of the Yangtze are closely related to regional tectonic activities.
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Key words:
- western Yangtze Block /
- Chengjiang Formation /
- detrital zircon /
- Hf isotope /
- crustal evolution /
- Dongchuan
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表 1 东川地区澄江组底部碎屑锆石U-Th-Pb同位素数据
Table 1. U-Th-Pb isotopic data of detrital zircons from the bottom of the Chengjiang Formation in the Dongchuan area
分析点 元素/10-6 Th/U 同位素比值 年龄/Ma 谐和度 Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ PM31-1-1 99.1 201 0.49 0.0703 0.0026 1.4829 0.0507 0.1544 0.0021 1000 76 923 21 925 11 99% PM31-1-2 477 493 0.97 0.0673 0.0016 1.2740 0.0311 0.1368 0.0012 856 51 834 14 827 7 99% PM31-1-3 591 995 0.59 0.0683 0.0015 1.3051 0.0295 0.1379 0.0012 876 44 848 13 833 7 98% PM31-1-4 776 1282 0.61 0.0696 0.0014 1.4491 0.0290 0.1508 0.0013 917 43 910 12 905 7 99% PM31-1-5 637 809 0.79 0.0761 0.0017 1.8668 0.0413 0.1774 0.0014 1098 45 1069 15 1053 8 98% PM31-1-6 245 487 0.50 0.1551 0.0028 9.5969 0.1841 0.4469 0.0041 2403 31 2397 18 2381 19 99% PM31-1-7 456 768 0.59 0.0684 0.0017 1.4338 0.0387 0.1510 0.0014 880 52 903 16 906 8 99% PM31-1-8 449 632 0.71 0.0673 0.0017 1.2675 0.0332 0.1362 0.0015 856 52 831 15 823 8 99% PM31-1-9 393 406 0.97 0.0677 0.0019 1.2833 0.0366 0.1376 0.0016 861 59 838 16 831 9 99% PM31-1-10 234 991 0.24 0.0688 0.0018 1.3317 0.0365 0.1399 0.0015 894 54 860 16 844 8 98% PM31-1-11 766 1509 0.51 0.0696 0.0017 1.3441 0.0342 0.1397 0.0014 917 52 865 15 843 8 97% PM31-1-12 568 318 1.79 0.1003 0.0026 4.0739 0.1060 0.2946 0.0031 1629 48 1649 21 1664 16 99% PM31-1-13 232 558 0.42 0.0672 0.0018 1.3032 0.0350 0.1406 0.0015 843 56 847 15 848 9 99% PM31-1-14 233 538 0.43 0.0744 0.0017 1.8522 0.0439 0.1803 0.0017 1052 46 1064 16 1069 10 99% PM31-1-15 624 865 0.72 0.0666 0.0014 1.3041 0.0300 0.1413 0.0013 828 46 848 13 852 8 99% PM31-1-16 631 502 1.26 0.0671 0.0017 1.2650 0.0322 0.1368 0.0012 839 53 830 14 826 7 99% PM31-1-17 197 206 0.95 0.0639 0.0040 1.2539 0.0626 0.1354 0.0028 739 127 825 28 819 16 99% PM31-1-18 124 185 0.67 0.0650 0.0030 1.2580 0.0549 0.1330 0.0014 776 99 827 25 805 8 97% PM31-1-19 507 626 0.81 0.0658 0.0015 1.2464 0.0283 0.1369 0.0012 1200 47 822 13 827 7 99% PM31-1-20 139 1048 0.13 0.0718 0.0014 1.7437 0.0333 0.1755 0.0015 983 39 1025 12 1042 8 98% PM31-1-21 625 896 0.70 0.0656 0.0017 1.1766 0.0325 0.1296 0.0012 794 59 790 15 786 7 99% PM31-1-22 142 231 0.62 0.0676 0.0022 1.3051 0.0425 0.1403 0.0016 857 69 848 19 846 9 99% PM31-1-23 342 866 0.39 0.0661 0.0017 1.2607 0.0330 0.1376 0.0010 809 48 828 15 831 6 99% PM31-1-24 270 544 0.50 0.0677 0.0017 1.3017 0.0321 0.1393 0.0011 861 58 846 14 841 6 99% PM31-1-25 283 481 0.59 0.0626 0.0017 1.1733 0.0304 0.1357 0.0012 694 57 788 14 820 7 96% PM31-1-26 198 307 0.65 0.0655 0.0020 1.2787 0.0382 0.1414 0.0012 791 63 836 17 853 7 98% PM31-1-27 384 689 0.56 0.0664 0.0014 1.3243 0.0288 0.1445 0.0013 817 44 856 13 870 8 98% PM31-1-28 177 674 0.26 0.0736 0.0015 1.8171 0.0365 0.1786 0.0015 1031 41 1052 13 1059 8 99% PM31-1-29 283 372 0.76 0.1108 0.0022 4.9596 0.0984 0.3238 0.0028 1813 35 1812 17 1808 14 99% PM31-1-30 533 578 0.92 0.0656 0.0017 1.2897 0.0335 0.1422 0.0015 794 58 841 15 857 8 98% PM31-1-31 337 440 0.77 0.0661 0.0018 1.2633 0.0329 0.1388 0.0014 809 56 829 15 838 8 99% PM31-1-32 74.0 162 0.46 0.0694 0.0027 1.3650 0.0507 0.1438 0.0017 909 80 874 22 866 10 99% PM31-1-33 268 361 0.74 0.0678 0.0022 1.2830 0.0404 0.1375 0.0014 861 67 838 18 831 8 99% PM31-1-34 533 763 0.70 0.0664 0.0014 1.2789 0.0289 0.1391 0.0012 820 46 836 13 839 7 99% PM31-1-35 253 464 0.55 0.0661 0.0016 1.2631 0.0304 0.1383 0.0013 809 45 829 14 835 7 99% PM31-1-36 126 262 0.48 0.0676 0.0020 1.3050 0.0386 0.1399 0.0012 855 61 848 17 844 7 99% PM31-1-37 195 273 0.71 0.0655 0.0020 1.2236 0.0368 0.1356 0.0014 791 64 811 17 820 8 99% PM31-1-38 400 532 0.75 0.0669 0.0015 1.2776 0.0301 0.1378 0.0012 835 46 836 13 832 7 99% PM31-1-39 816 785 1.04 0.0958 0.0018 3.6873 0.0715 0.2776 0.0024 1544 40 1569 16 1579 12 99% PM31-1-40 167 238 0.70 0.0658 0.0024 1.2403 0.0455 0.1364 0.0016 800 78 819 21 824 9 99% PM31-1-41 399 573 0.70 0.0657 0.0017 1.2538 0.0330 0.1379 0.0013 796 54 825 15 833 8 99% PM31-1-42 417 866 0.48 0.0673 0.0015 1.2811 0.0283 0.1378 0.0012 856 47 837 13 832 7 99% PM31-1-43 254 523 0.49 0.0741 0.0018 1.7818 0.0447 0.1736 0.0015 1056 50 1039 16 1032 8 99% PM31-1-44 246 652 0.38 0.1214 0.0019 6.0992 0.1022 0.3627 0.0030 1977 28 1990 15 1995 14 99% PM31-1-45 463 901 0.51 0.1075 0.0017 4.7085 0.0807 0.3161 0.0026 1767 29 1769 14 1771 13 99% PM31-1-46 380 524 0.72 0.1862 0.0028 13.6378 0.2137 0.5292 0.0043 2709 30 2725 15 2738 18 99% PM31-1-47 1098 2083 0.53 0.0678 0.0011 1.3203 0.0225 0.1407 0.0011 863 35 855 10 849 6 99% PM31-1-48 213 449 0.47 0.0657 0.0017 1.2727 0.0330 0.1401 0.0012 798 54 834 15 845 7 98% PM31-1-49 255 502 0.51 0.0737 0.0018 1.7723 0.0439 0.1739 0.0017 1035 50 1035 16 1034 9 99% PM31-1-50 409 827 0.49 0.0661 0.0016 1.3304 0.0330 0.1454 0.0013 809 47 859 14 875 7 98% PM31-1-51 241 458 0.53 0.0695 0.0018 1.3678 0.0357 0.1424 0.0014 915 53 875 15 858 8 98% PM31-1-52 225 692 0.32 0.0729 0.0015 1.7428 0.0367 0.1730 0.0015 1011 43 1024 14 1028 8 99% PM31-1-53 328 441 0.74 0.0654 0.0018 1.2433 0.0353 0.1377 0.0014 789 62 820 16 832 8 98% PM31-1-54 168 282 0.60 0.0670 0.0021 1.2755 0.0400 0.1380 0.0015 839 65 835 18 833 9 99% PM31-1-55 562 1417 0.40 0.0744 0.0013 1.7909 0.0324 0.1739 0.0013 1052 35 1042 12 1034 7 99% PM31-1-56 309 339 0.91 0.0676 0.0018 1.3025 0.0353 0.1396 0.0013 857 62 847 16 842 7 99% PM31-1-57 333 486 0.68 0.0660 0.0016 1.2599 0.0305 0.1384 0.0012 806 52 828 14 836 7 99% PM31-1-58 248 361 0.69 0.0676 0.0018 1.2802 0.0332 0.1374 0.0013 855 (145) 837 15 830 7 99% PM31-1-59 371 453 0.82 0.0672 0.0018 1.2718 0.0336 0.1370 0.0012 844 56 833 15 827 7 99% PM31-1-60 262 424 0.62 0.0678 0.0018 1.3039 0.0331 0.1395 0.0013 861 55 847 15 842 8 99% PM31-1-61 122 1360 0.09 0.0747 0.0014 1.8172 0.0351 0.1757 0.0013 1061 39 1052 13 1043 7 99% PM31-1-62 571 828 0.69 0.0681 0.0018 1.2917 0.0389 0.1368 0.0014 872 57 842 17 826 8 98% PM31-1-63 147 192 0.77 0.0685 0.0024 1.3129 0.0446 0.1398 0.0017 883 72 851 20 843 9 99% PM31-1-64 320 361 0.89 0.1154 0.0022 5.3151 0.1047 0.3337 0.0030 1887 35 1871 17 1856 14 99% PM31-1-65 234 515 0.45 0.0666 0.0016 1.2961 0.0321 0.1408 0.0014 828 50 844 14 849 8 99% PM31-1-66 242 655 0.37 0.0658 0.0014 1.2701 0.0273 0.1398 0.0011 798 44 832 12 843 6 98% PM31-1-67 227 488 0.47 0.1866 0.0029 13.7682 0.2322 0.5339 0.0041 2712 26 2734 16 2758 17 99% PM31-1-68 450 1510 0.30 0.0659 0.0012 1.2597 0.0240 0.1385 0.0012 806 39 828 11 836 7 99% PM31-1-69 178 264 0.67 0.0654 0.0020 1.1688 0.0356 0.1303 0.0013 787 65 786 17 789 7 99% PM31-1-70 157 406 0.39 0.1127 0.0020 5.1799 0.0976 0.3335 0.0027 1843 33 1849 16 1855 13 99% PM31-1-71 628 764 0.82 0.0908 0.0017 3.1905 0.0617 0.2549 0.0021 1443 35 1455 15 1464 11 99% PM31-1-72 125 741 0.17 0.1117 0.0049 5.3436 0.3243 0.3352 0.0042 1827 80 1876 52 1863 20 99% PM31-1-73 497 594 0.84 0.0656 0.0016 1.2314 0.0323 0.1361 0.0013 794 56 815 15 823 7 99% PM31-1-74 392 615 0.64 0.0627 0.0015 1.1561 0.0296 0.1342 0.0014 698 54 780 14 812 8 96% PM31-1-75 675 824 0.82 0.0661 0.0015 1.2382 0.0310 0.1361 0.0015 809 48 818 14 823 8 99% PM31-1-76 310 506 0.61 0.0796 0.0019 2.2359 0.0563 0.2031 0.0018 1187 48 1192 18 1192 10 99% PM31-1-77 228 372 0.61 0.0663 0.0018 1.1912 0.0310 0.1304 0.0012 817 56 797 14 790 7 99% PM31-1-78 351 411 0.85 0.0648 0.0018 1.1941 0.0327 0.1336 0.0012 769 58 798 15 808 7 98% PM31-1-79 217 271 0.80 0.0656 0.0020 1.2277 0.0408 0.1351 0.0015 794 65 813 19 817 9 99% PM31-1-81 262 582 0.45 0.0663 0.0015 1.2991 0.0307 0.1415 0.0012 817 49 845 14 853 7 99% PM31-1-82 249 699 0.36 0.0653 0.0014 1.3102 0.0276 0.1453 0.0014 783 46 850 12 874 8 97% PM31-1-83 214 1704 0.13 0.0719 0.0013 1.6941 0.0297 0.1700 0.0013 983 37 1006 11 1012 7 99% PM31-1-84 550 1244 0.44 0.0649 0.0013 1.2396 0.0254 0.1377 0.0013 772 44 819 12 831 7 98% PM31-1-85 130 880 0.15 0.0709 0.0015 1.7090 0.0372 0.1736 0.0015 954 44 1012 14 1032 8 98% PM31-1-86 405 481 0.84 0.1108 0.0021 5.2868 0.1023 0.3434 0.0030 1813 34 1867 17 1903 15 98% PM31-1-87 107 1012 0.11 0.0715 0.0014 1.7002 0.0327 0.1713 0.0013 972 39 1009 12 1019 7 98% PM31-1-88 443 603 0.73 0.0660 0.0016 1.2516 0.0295 0.1371 0.0013 806 52 824 13 828 8 99% PM31-1-91 696 926 0.75 0.0647 0.0013 1.2332 0.0237 0.1375 0.0011 765 43 816 11 830 6 98% PM31-1-92 208 756 0.27 0.0720 0.0015 1.7295 0.0341 0.1732 0.0014 987 41 1020 13 1030 8 99% PM31-1-93 270 418 0.65 0.0645 0.0019 1.2370 0.0376 0.1380 0.0013 767 62 818 17 833 7 98% PM31-1-94 230 353 0.65 0.0661 0.0022 1.2713 0.0421 0.1386 0.0015 809 69 833 19 837 8 99% PM31-1-95 353 323 1.09 0.0635 0.0021 1.1767 0.0367 0.1341 0.0013 724 69 790 17 811 7 97% PM31-1-96 398 637 0.62 0.0651 0.0023 1.1835 0.0391 0.1314 0.0012 776 74 793 18 796 7 99% PM31-1-97 401 609 0.66 0.0663 0.0017 1.2989 0.0318 0.1414 0.0013 817 56 845 14 852 7 99% PM31-1-98 277 732 0.38 0.0661 0.0016 1.3252 0.0319 0.1448 0.0013 809 47 857 14 872 8 98% PM31-1-99 603 1054 0.57 0.0665 0.0014 1.3077 0.0265 0.1421 0.0013 822 44 849 12 857 7 99% PM31-1-100 674 1686 0.40 0.0662 0.0014 1.3390 0.0277 0.1461 0.0014 813 43 863 12 879 8 98% 
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表 2 东川地区澄江组底部碎屑锆石Hf同位素组成
Table 2. Hf isotope compositions of detrial zircons from the bottom of the Chengjiang Formation in the Dongchuan area
分析点(同年龄点) 176Hf/177Hf 1σ 176Lu/177Hf 1σ 176Yb/177Hf 1σ U-Pb年龄/Ma εHf(0) 1σ εHf(t) 1σ TDM1/Ma TDM2/Ma fLu/Hf PM31-1-2 0.282402 0.000023 0.001675 0.000022 0.051359 0.000779 827 -13.1 1.0 4.3 1.0 1223 1369 -0.95 PM31-1-6 0.281230 0.000028 0.000725 0.000011 0.023480 0.000349 2403 -54.5 1.1 -1.9 1.2 2798 2958 -0.98 PM31-1-11 0.282112 0.000027 0.001188 0.000012 0.041144 0.000418 843 -23.3 1.1 -5.4 1.1 1613 1911 -0.96 PM31-1-12 0.281748 0.000019 0.001050 0.000013 0.032330 0.001041 1629 -36.2 0.9 -1.1 0.9 2112 2302 -0.97 PM31-1-20 0.282143 0.000028 0.000273 0.000005 0.011212 0.000361 983 -22.3 1.1 -0.7 1.1 1533 1765 -0.99 PM31-1-28 0.282082 0.000028 0.000127 0.000006 0.005261 0.000191 1031 -24.4 1.1 -1.7 1.1 1610 1858 -1.00 PM31-1-32 0.282309 0.000045 0.000376 0.000002 0.013363 0.000218 866 -16.4 1.7 2.6 1.7 1309 1494 -0.99 PM31-1-40 0.282455 0.000026 0.001098 0.000016 0.036903 0.000785 824 -11.2 1.1 6.4 1.1 1130 1250 -0.97 PM31-1-43 0.282209 0.000029 0.001739 0.000041 0.066613 0.001092 1056 -19.9 1.1 2.2 1.2 1500 1664 -0.95 PM31-1-46 0.281108 0.000021 0.000705 0.000004 0.025493 0.000593 2709 -58.9 0.9 0.8 1.0 2961 3063 -0.98 PM31-1-51 0.282210 0.000029 0.000769 0.000003 0.027199 0.000325 858 -19.9 1.2 -1.3 1.2 1460 1702 -0.98 PM31-1-54 0.282383 0.000025 0.001019 0.000016 0.037199 0.000568 833 -13.8 1.0 4.1 1.0 1228 1384 -0.97 PM31-1-56 0.282389 0.000025 0.000992 0.000008 0.036075 0.000404 842 -13.5 1.0 4.5 1.1 1219 1367 -0.97 PM31-1-59 0.282621 0.000018 0.001103 0.000008 0.036063 0.000624 827 -5.3 0.8 12.4 0.9 895 922 -0.97 PM31-1-69 0.282428 0.000030 0.001411 0.000006 0.073072 0.001315 789 -12.2 1.2 4.5 1.2 1177 1324 -0.96 PM31-1-70 0.281450 0.000015 0.000317 0.000004 0.009838 0.000184 1843 -46.7 0.7 -6.1 0.8 2473 2738 -0.99 PM31-1-72 0.281535 0.000012 0.001402 0.000011 0.036323 0.000255 1827 -43.7 0.7 -4.7 0.8 2427 2655 -0.96 PM31-1-93 0.282454 0.000022 0.001136 0.000011 0.041723 0.000357 833 -11.2 0.9 6.6 1.0 1132 1248 -0.97 PM31-1-99 0.282342 0.000038 0.000805 0.000019 0.027064 0.000484 857 -15.2 1.4 3.3 1.5 1278 1448 -0.98 PM31-1-100 0.282171 0.000017 0.001139 0.000022 0.040795 0.001369 879 -21.3 0.8 -2.5 0.8 1530 1783 -0.97 注：锆石εHf(t)值采用相应的U-Pb年龄计算，λ=1.867×10-11/a，(176Hf/177Hf)CHUR= 0.282772，(176Lu/177Hf)CHUR = 0.0332；(76Lu/177Hf)DM= 0.0384, (176Hf/177Hf)DM = 0.28325；(176Lu/177Hf)平均地壳= 0.015
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