LA-ICP-MS zircon U-Pb dating of migmatite in Datian, Panzhihua City, and its geological significance
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摘要:
广泛分布于扬子地台西缘康滇地轴上的康定杂岩,其形成时代一直争议较大。选取前人少有涉及的大田地区混合岩进行LA-ICP-MS锆石U-Pb年龄测定,结果表明,其年龄时限集中在744~772Ma之间,为晋宁造山运动期产物,与近年其他学者针对康定杂岩的锆石测年结果一致,说明康滇地轴最大一次混合岩化作用发生在晋宁期。混合岩稀土元素具2种明显不同的配分型式,显示深熔作用特征。深熔作用早期混合岩Eu具正异常特征,晚期则具明显的负Eu异常,显示有分异结晶作用。有利的铀矿赋矿围岩为深熔作用晚期分异结晶形成的混合岩
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关键词:
- LA-ICP-MS锆石U-Pb测年 /
- 地球化学 /
- 混合岩 /
- 康滇地轴 /
- 铀矿
Abstract:The Kangding complex that is extensively distributed in the Kangdian Axis on the western margin of Yangtze Platform is greatly disputed in terms of its formation age. In this paper, migmatite in Datian region which has rarely been referred to before was selected to perform U-Pb zircon LA-ICP-MS age determination. The results show that the ages are mainly concentrated from 744Ma to 772Ma, suggesting that the complex was formed in Jinning orogeny period; moreover, this conforms to the zircon dating results specific to the Kangding complex presented by other researchers, which further indicates that the strongest migmatization event of Xikang-Yunnan Axis occurred in the Jinning period. There exist two distinctly different REE patterns of the migmatite which indicates geochemical characteristics of anatexite. At the early stage of anatexis, the magmatite produced positive anomaly of Eu; whereas at the later stage, Eu negative anomaly implying a process of differentiation crystallization was produced. The beneficial host rock of uranium mineralization is the magmatite formed by differentiation crystallization in the late period of anatexis.
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Key words:
- LA-ICP-MS zircon U-Pb dating /
- geochemistry /
- migmatite /
- Kangdian Axis /
- uranium mineralization
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表 1 黑云斜长混合岩 (DY-1) LA-ICP-MS锆石U-Th-Pb定年结果
Table 1. LA-ICP-MS zircon U-Th-Pb isotope data for biotite plagioclase migmatite samples
测试号 含量/10-6 同位素比值 年龄/Ma Pb U 232Th/238U 206Pb/238U ±1σ 207Pb/235U ±1σ 207Pb/206Pb ±1σ 206Pb/238U ±1σ 207Pb/235U ±1σ 207Pb/206Pb ±1σ 黑云斜长混合岩DY-1 DY-1.1 109 741 0.662 0.1273 0.0008 1.1591 0.0132 0.0661 0.0008 772 5 782 9 808 25 DY-1.2 220 1443 0.486 0.1386 0.0008 1.2932 0.0124 0.0677 0.0007 837 5 843 8 859 22 DY-1.3 269 1647 0.037 0.1328 0.0009 1.2601 0.0193 0.0688 0.0011 804 5 828 13 893 33 DY-1.4 160 1106 0.580 0.1272 0.0007 1.2056 0.0106 0.0687 0.0007 772 5 803 7 890 20 DY-1.5 298 1813 1.115 0.1278 0.0008 1.1743 0.0084 0.0667 0.0006 775 5 789 6 827 18 DY-1.6 151 1069 0.521 0.1278 0.0008 1.2049 0.0198 0.0684 0.0011 775 5 803 13 880 34 DY-1.7 339 2254 0.715 0.1281 0.0008 1.2029 0.0085 0.0681 0.0005 777 5 802 6 871 16 DY-1.8 359 2696 0.333 0.1282 0.0008 1.1557 0.0265 0.0654 0.0015 778 5 780 18 786 47 DY-1.9 238 1509 0.705 0.1273 0.0008 1.1584 0.0343 0.0660 0.0019 772 5 781 23 806 60 DY-1.10 119 745 0.332 0.1521 0.0012 1.4633 0.0126 0.0698 0.0005 913 7 915 8 921 15 DY-1.11 273 1781 0.159 0.1551 0.0010 1.5104 0.0075 0.0706 0.0005 929 6 935 5 947 14 DY-1.12 301 2075 0.570 0.1292 0.0008 1.1676 0.0138 0.0655 0.0008 783 5 785 9 792 27 DY-1.13 334 2653 0.096 0.1258 0.0008 1.1340 0.0082 0.0654 0.0005 764 5 770 6 787 16 DY-1.14 497 3065 0.738 0.1289 0.0008 1.2035 0.0283 0.0677 0.0016 781 5 802 19 860 49 DY-1.15 453 2945 0.462 0.1306 0.0009 1.2184 0.0324 0.0677 0.0018 791 5 809 22 858 56 DY-1.16 228 1484 0.703 0.1266 0.0008 1.1763 0.0318 0.0674 0.0018 769 5 790 21 849 55 DY-1.17 111 725 0.573 0.1265 0.0008 1.1534 0.0251 0.0661 0.0015 768 5 779 17 810 46 DY-1.18 181 1252 0.409 0.1264 0.0008 1.1765 0.0291 0.0675 0.0016 767 5 790 20 853 51 DY-1.19 194 1273 0.572 0.1368 0.0008 1.2900 0.0110 0.0684 0.0006 826 5 841 7 881 19 DY-1.20 238 1379 0.754 0.1446 0.0010 1.4104 0.0205 0.0707 0.0010 871 6 893 13 950 30 DY-1.21 290 1608 0.083 0.1579 0.0013 1.6478 0.0194 0.0757 0.0008 945 7 989 12 1087 20 DY-1.24 503 2998 0.543 0.1343 0.0011 1.1775 0.0465 0.0636 0.0025 812 6 790 31 728 84 黑云斜长混合岩DY-16 DY-16.1 39 289 0.114 0.1377 0.0008 1.2776 0.0113 0.0673 0.0006 832 5 836 7 846 17 DY-16.2 5 37 0.709 0.1274 0.0008 1.1614 0.0392 0.0661 0.0022 773 5 783 26 811 71 DY-16.3 3 21 0.618 0.1271 0.0010 1.1419 0.0730 0.0652 0.0042 771 6 773 49 780 134 DY-16.4 12 61 1.205 0.1451 0.0010 1.3644 0.0226 0.0682 0.0011 874 6 874 14 874 35 DY-16.5 11 66 0.470 0.1475 0.0009 1.4089 0.0179 0.0693 0.0009 887 5 893 11 907 27 DY-16.6 15 93 0.136 0.1612 0.0010 1.5915 0.0157 0.0716 0.0008 964 6 967 10 975 22 DY-16.8 6 40 0.491 0.1403 0.0010 1.3151 0.0332 0.0680 0.0017 846 6 852 21 868 52 DY-16.9 1 6 0.243 0.1370 0.0028 1.2654 0.2507 0.0670 0.0145 828 17 830 165 837 450 DY-16.10 6 42 0.650 0.1274 0.0008 1.1520 0.0363 0.0656 0.0021 773 5 778 24 793 66 DY-16.11 6 40 0.593 0.1273 0.0008 1.2106 0.0369 0.0690 0.0021 772 5 805 25 898 63 DY-16.12 20 150 0.245 0.1331 0.0008 1.2192 0.0111 0.0664 0.0006 806 5 809 7 820 20 DY-16.13 5 28 1.440 0.1320 0.0009 1.2052 0.0604 0.0662 0.0033 799 6 803 40 813 105 DY-16.14 2 17 0.372 0.1414 0.0010 1.3197 0.0810 0.0677 0.0041 853 6 854 52 858 127 DY-16.15 5 34 0.487 0.1254 0.0008 1.1301 0.0309 0.0653 0.0018 762 5 768 21 786 57 DY-16.16 5 35 0.430 0.1327 0.0009 1.2096 0.0459 0.0661 0.0025 803 5 805 31 809 79 DY-16.17 5 31 0.639 0.1329 0.0009 1.2138 0.0435 0.0662 0.0024 804 5 807 29 814 75 DY-16.18 3 22 0.478 0.1269 0.0010 1.1424 0.0680 0.0653 0.0039 770 6 774 46 784 124 DY-16.19 11 78 0.196 0.1413 0.0010 1.3526 0.0280 0.0694 0.0015 852 6 869 18 912 44 DY-16.20 5 31 0.651 0.1311 0.0008 1.1984 0.0426 0.0663 0.0023 794 5 800 28 816 74 DY-16.21 39 240 0.159 0.1632 0.0010 1.6407 0.0158 0.0729 0.0007 974 6 986 10 1012 20 DY-16.22 8 47 0.350 0.1450 0.0009 1.3763 0.0239 0.0688 0.0012 873 6 879 15 894 35 DY-16.23 43 269 0.113 0.1583 0.0010 1.5501 0.0213 0.0710 0.0009 947 6 951 13 958 26 DY-16.24 60 346 0.077 0.1590 0.0014 1.5612 0.0567 0.0712 0.0021 951 8 955 35 964 61 角闪斜长混合岩DY-19 DY-19.1 4 25 0.519 0.1257 0.0008 1.1279 0.0341 0.0651 0.0019 763 5 767 23 777 62 DY-19.2 12 39 0.500 0.1722 0.0014 1.7440 0.0230 0.0735 0.0007 1024 8 1025 14 1027 20 DY-19.3 8 60 0.570 0.1221 0.0007 1.0896 0.0203 0.0647 0.0012 743 5 748 14 765 40 DY-19.4 19 137 0.660 0.1237 0.0007 1.1132 0.0107 0.0653 0.0007 752 4 760 7 783 22 DY-19.5 8 60 0.600 0.1220 0.0007 1.0942 0.0211 0.0650 0.0013 742 5 751 14 776 42 DY-19.6 7 52 0.597 0.1221 0.0008 1.0824 0.0277 0.0643 0.0016 743 5 745 19 751 53 DY-19.7 10 66 0.912 0.1222 0.0007 1.0948 0.0208 0.0650 0.0013 743 4 751 14 774 41 DY-19.8 11 87 0.372 0.1258 0.0007 1.1225 0.0148 0.0647 0.0009 764 5 764 10 765 29 DY-19.9 72 510 0.441 0.1339 0.0009 1.2864 0.0081 0.0697 0.0005 810 5 840 5 919 14 DY-19.10 6 44 0.704 0.1225 0.0008 1.1015 0.0309 0.0652 0.0018 745 5 754 21 781 59 DY-19.11 7 51 0.786 0.1227 0.0008 1.0968 0.0280 0.0648 0.0017 746 5 752 19 769 54 DY-19.12 7 49 0.944 0.1222 0.0007 1.0851 0.0205 0.0644 0.0013 743 5 746 14 754 41 DY-19.13 12 89 0.660 0.1230 0.0007 1.0958 0.0137 0.0646 0.0009 748 4 751 9 761 28 DY-19.14 6 45 0.729 0.1219 0.0007 1.2330 0.0300 0.0734 0.0018 741 4 816 20 1025 50 DY-19.15 4 25 0.447 0.1271 0.0008 1.1552 0.0359 0.0659 0.0020 771 5 780 24 804 62 DY-19.16 12 86 0.572 0.1251 0.0007 1.1318 0.0169 0.0656 0.0010 760 5 769 11 794 33 DY-19.17 7 42 0.890 0.1285 0.0008 1.1685 0.0299 0.0660 0.0017 779 5 786 20 805 53 DY-19.18 4 26 0.708 0.1305 0.0009 1.1817 0.0335 0.0657 0.0018 791 6 792 22 797 58 DY-19.20 5 35 0.864 0.1261 0.0008 1.1715 0.0314 0.0674 0.0018 766 5 787 21 849 56 DY-19.21 4 28 0.643 0.1266 0.0008 1.1715 0.0356 0.0671 0.0020 769 5 787 24 841 63 DY-19.22 12 76 0.748 0.1306 0.0008 1.2409 0.0178 0.0689 0.0010 791 5 819 12 896 30 DY-19.23 5 30 0.668 0.1284 0.0009 1.1668 0.0403 0.0659 0.0022 779 5 785 27 803 71 DY-19.24 6 38 0.655 0.1305 0.0008 1.2063 0.0424 0.0671 0.0023 790 5 804 28 840 73 石英闪长岩DY-20 DY-20.1 7 47 0.751 0.1233 0.0008 1.2213 0.0104 0.0718 0.0005 749 5 810 7 982 15 DY-20.2 1 1 0.954 0.1233 0.0008 1.0980 0.0099 0.0646 0.0004 750 5 752 7 760 14 DY-20.3 20 141 0.606 0.1232 0.0008 1.0936 0.0088 0.0644 0.0005 749 5 750 6 754 15 DY-20.4 7 46 0.614 0.1230 0.0008 1.2643 0.0110 0.0745 0.0010 748 5 830 7 1056 28 DY-20.5 10 77 0.256 0.1232 0.0008 1.2476 0.0093 0.0734 0.0007 749 5 822 6 1026 18 DY-20.6 10 63 0.865 0.1272 0.0008 1.1927 0.0128 0.0680 0.0007 772 5 797 9 869 20 DY-20.7 8 52 0.624 0.1288 0.0008 1.2471 0.0298 0.0702 0.0005 781 5 822 20 935 14 DY-20.8 4 30 0.587 0.1268 0.0008 1.1538 0.0110 0.0660 0.0005 770 5 779 7 806 17 DY-20.9 6 38 0.888 0.1289 0.0009 1.1674 0.0135 0.0657 0.0004 782 5 785 9 797 13 DY-20.10 8 49 0.675 0.1304 0.0009 1.2091 0.0102 0.0672 0.0004 790 5 805 7 845 14 DY-20.11 6 37 0.561 0.1273 0.0008 1.1536 0.0098 0.0657 0.0004 772 5 779 7 798 14 DY-20.12 14 92 0.670 0.1361 0.0008 1.2815 0.0098 0.0683 0.0004 823 5 838 6 877 13 DY-20.13 4 24 0.574 0.1302 0.0008 1.2266 0.0120 0.0683 0.0011 789 5 813 8 879 34 DY-20.14 4 28 0.745 0.1318 0.0009 1.2470 0.0114 0.0686 0.0007 798 5 822 7 887 21 DY-20.15 4 24 0.641 0.1374 0.0008 1.3162 0.0262 0.0695 0.0006 830 5 853 17 912 17 DY-20.16 2 12 0.483 0.1293 0.0009 1.1739 0.0223 0.0659 0.0004 784 5 788 15 802 13 DY-20.17 4 22 0.738 0.1331 0.0009 1.2488 0.0170 0.0681 0.0023 805 5 823 11 870 70 DY-20.18 1 4 0.570 0.1333 0.0009 1.2972 0.0142 0.0706 0.0007 806 6 844 9 946 20 DY-20.19 8 54 0.627 0.1302 0.0013 1.2501 0.0130 0.0697 0.0004 789 8 823 9 918 13 DY-20.20 9 64 0.398 0.1315 0.0009 1.2704 0.0102 0.0701 0.0005 797 5 833 7 930 15 DY-20.21 4 27 0.317 0.1298 0.0008 1.2149 0.0103 0.0679 0.0005 786 5 807 7 866 16 DY-20.22 4 25 0.581 0.1311 0.0009 1.1975 0.0097 0.0662 0.0008 794 5 799 6 814 27 DY-20.23 6 41 0.446 0.1393 0.0008 1.3011 0.0169 0.0677 0.0006 841 5 846 11 861 19 DY-20.24 9 66 0.063 0.1367 0.0008 1.2716 0.0094 0.0674 0.0005 826 5 833 6 851 16 DY-20.25 1 10 0.567 0.1242 0.0007 1.1092 0.0117 0.0648 0.0006 755 5 758 8 767 21 表 2 混合岩稀土元素分析结果
Table 2. REE compositions of migmatite
10-6 样品编号 ZY-13 ZY-17 ZY-33 ZY-49 ZY-50 ZY-51 W-1 W-2 W-8 W-12 La 28.10 37.30 28.60 30.90 15.30 23.00 31.30 23.40 143.00 31.40 Ce 48.20 67.30 54.20 57.10 24.10 39.80 79.90 56.50 264.00 63.90 Pr 4.88 6.97 5.86 5.90 2.19 3.96 10.50 7.03 27.90 7.87 Nd 17.20 24.10 21.20 22.30 6.79 12.60 45.60 28.60 104.00 32.00 Sm 2.37 2.96 3.69 3.56 0.85 1.66 10.50 5.61 17.50 5.90 Eu 1.64 1.71 1.65 1.54 0.73 0.85 1.10 0.34 1.36 1.18 Gd 2.37 2.32 3.81 2.95 0.89 1.46 9.86 5.84 16.00 6.26 Tb 0.30 0.28 0.48 0.42 0.17 0.22 1.90 1.06 2.42 1.08 Dy 1.51 1.38 2.52 1.83 0.92 1.34 10.90 6.22 12.90 6.57 Ho 0.29 0.21 0.44 0.39 0.13 0.23 1.99 1.14 1.95 1.25 Er 0.83 0.64 1.30 1.09 0.34 0.68 6.32 3.47 4.71 3.67 Tm 0.13 0.11 0.17 0.15 0.07 0.11 1.01 0.62 0.71 0.56 Yb 0.82 0.75 0.90 0.96 0.40 0.82 6.18 4.13 3.39 3.40 Lu 0.11 0.12 0.13 0.15 0.05 0.10 0.73 0.62 0.41 0.45 Y 8.08 6.18 11.40 9.67 3.65 6.45 60.00 37.60 56.60 36.20 ∑REE 108.76 146.15 124.95 129.25 52.91 86.83 217.79 144.58 600.25 165.49 LREE 102.39 140.34 115.20 121.30 49.96 81.87 178.90 121.48 557.76 142.25 HREE 6.37 5.81 9.75 7.95 2.95 4.96 38.89 23.10 42.49 23.24 LREE/HREE 16.09 24.14 11.82 15.27 16.94 16.50 4.60 5.26 13.13 6.12 (La/Yb)N 24.61 35.72 22.77 22.99 27.57 20.07 3.63 4.06 30.26 6.62 δEu 2.12 1.99 1.35 1.45 2.57 1.67 0.33 0.18 0.25 0.59 δCe 1.01 1.02 1.03 1.04 1.02 1.02 1.08 1.08 1.02 1.00 样品编号 W-13 W-15 W-16 W-17 W-18 Y18-1 DT-Y21 XT-1 XT-2 XT-3 La 30.20 266.00 277.00 193.00 108.00 27.10 35.00 45.60 30.90 28.40 Ce 68.00 504.00 547.00 399.00 213.00 61.30 91.80 104.00 82.60 74.70 Pr 8.74 56.10 63.20 46.70 24.30 8.28 12.60 13.70 12.20 10.80 Nd 34.60 214.00 241.00 181.00 90.60 38.30 57.30 54.60 56.10 47.20 Sm 7.84 31.30 43.90 32.90 14.10 10.90 13.60 12.80 16.40 13.10 Eu 0.94 1.50 1.86 2.44 1.72 1.28 1.28 1.74 0.82 0.98 Gd 7.98 22.90 34.70 24.50 11.90 8.99 12.00 9.90 12.00 9.40 Tb 1.50 2.65 5.37 3.37 1.68 2.21 3.68 2.34 3.26 2.64 Dy 8.97 11.10 29.40 15.20 9.81 15.20 23.40 15.00 20.00 16.60 Ho 1.50 1.55 4.96 1.98 1.89 2.98 5.20 3.26 4.28 3.54 Er 3.73 4.00 14.00 4.65 6.95 7.22 14.30 8.96 11.60 9.29 Tm 0.51 0.45 1.81 0.53 1.08 0.88 2.00 1.36 1.64 1.32 Yb 2.56 2.27 10.60 2.55 7.85 4.99 12.90 8.32 9.44 7.50 Lu 0.35 0.31 1.33 0.29 1.20 0.61 1.70 1.20 1.28 1.04 Y 37.00 41.80 124.00 58.00 52.10 65.40 128.00 82.80 101.00 78.20 ∑REE 177.42 1118.13 1276.13 908.10 494.08 190.24 286.76 282.78 262.52 226.51 LREE 150.32 1072.90 1173.96 855.04 451.72 147.16 211.58 232.44 199.02 175.18 HREE 27.10 45.23 102.17 53.06 42.36 43.08 75.18 50.34 63.50 51.33 LREE/HREE 5.55 23.72 11.49 16.11 10.66 3.42 2.81 4.62 3.13 3.41 (La/Yb)N 8.46 84.05 18.74 54.29 9.87 3.90 1.95 3.93 2.35 2.72 δEu 0.36 0.17 0.15 0.26 0.41 0.38 0.30 0.46 0.17 0.26 δCe 1.03 1.01 1.01 1.03 1.02 0.99 1.07 1.01 1.04 1.05 注:测试单位为核工业北京地质研究院分析测试研究中心 -
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