Geochemical characteristics of Neoproterozoic-Early Paleozoic meta-sedimentary of Longquan Group and implications for tectonic evolution in South China
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摘要:
华夏地块是华南大陆的重要组成部分, 但其属于古陆还是造山带一直存在争议。选取华夏地块北部浙南地区龙泉岩群变沉积岩, 开展了野外调查、年代学研究、原岩恢复和原岩构造环境判别。龙泉岩群变沉积岩的碎屑锆石年龄谱具有多峰值特征, 存在明显的Grenville期和泛非期峰值, 反映了其源区与冈瓦纳古陆的亲缘性; 4件变沉积岩样品的最大沉积年龄分别为618 Ma、620 Ma、570 Ma和549 Ma, 结合区内加里东期花岗岩、变质作用等信息, 推测变沉积岩的原岩应形成于新元古代—早古生代。岩相学及地球化学特征分析表明, 龙泉岩群变沉积岩的原岩为杂砂岩和粘土岩, 为类复理石建造, 形成于活动大陆边缘环境。龙泉岩群包括类复理石构成的基质和变基性岩、硅质岩、大理岩等构成的岩块, 它们形成于不同时代、不同构造环境, 最年轻的基质沉积于震旦纪晚期(570~549 Ma)之后, 其构造属性应为新元古代—早古生代俯冲增生杂岩, 指示该时期扬子与华夏两大块体尚未碰撞拼贴。
Abstract:Cathaysia is an important part of the South China block, and whether its tectonic setting is an old continent or orogeny has been controversial.We dated detrital zircon U-Pb ages of Longquan Group meta-sedimentary rocks from southern Zhejiang Province in northern Cathaysia, analyzed the petrography, geochemistry and original tectonic settings of their protolith.The age spectrum of detrital zircons of these meta-sedimentary rocks shows multiple peaks, including the Pan-Africa and the Grenville peaks, reflecting their affinity with the Gondwana paleocontinent.The maximum sedimentary ages of the four samples are 618 Ma, 620 Ma, 570 Ma and 549 Ma respectively, combined with Caledonian granite intrusion and metamorphism in the region, the protoliths of meta-sedimentary rocks were inferred to be formed in Neoproterozoic to early Paleozoic.According to their petrographic and geochemical characteristics, the protoliths of the meta-sedimentary rocks are graywacke and clay rocks, which belong to flysch-like formation in active continent margin.Longquan Group is constituted by flysch-like matrix and exotic blocks, including meta-basites, siliceous rocks and marbles, formed in different time and different tectonic setting, and the youngest matrix deposited after Late Sinian(570~549 Ma).It is concluded that Longquan Group is Neoproterozoic-early Paleozoic subduction-accretionary complex, which implied that the Cathaysia Block and the Yangtze Block had not collided in this period.
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表 1 龙泉岩群变沉积岩基质样品
Table 1. Meta-sedimentary matrix samples of the Longquan Group
样品编号 采样位置 岩石名称 主要特征 LQ4-1 万山村 云母石英片岩 石英(45%)+绢云母(30%)+长石(15%)+绿泥石(3%)+白云母等(5%)，鳞片粒状变晶结构，片状构造 LQ9-2 高际头村 黑云斜长片麻岩 石英(60%)+长石(20%)+黑云母(15%)+极少量白云母(3%)，鳞片粒状变晶结构，片麻状构造、条带状构造 LQ29-1 拓坑村 云母石英片岩 石英(70%)+白云母(10%)+黑云母(15%)+长石(5%)，鳞片粒状变晶结构，片状构造 LQ8-1 高际头村 云母石英片岩 石英(75%)+长石(10%)+绢云母(15%)，鳞片粒状变晶结构，片状构造、条带状构造 LQ13-2 黄弄村 变长石石英砂岩 石英(60%~70%)+长石(30%)+杂基(5%)，变余砂状结构 LQ18-1 南弄村 黑云斜长片麻岩 石英(65%)+长石(15%)+黑云母(15%)，鳞片粒状变晶结构，片麻状构造、条带状构造 LQ108-2 大坑下村 云母石英片岩 石英(60%)+黑云母(25%)+长石(15%)，鳞片粒状变晶结构，片状构造 LQ112-1 内炉溪村 斜长黑云片麻岩 石英(55%)+黑云母(25%)+长石(15%)，鳞片粒状变晶结构，片麻状构造 
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表 2 龙泉岩群变沉积岩碎屑锆石LA-ICP-MS U-Th-Pb分析结果
Table 2. LA-ICP-MS U-Th-Pb dating results of detrital zircons from Longquan Group meta-sedimentary rocks
分析点 Th/10-6 U/10-6 Th/U 同位素比值 年龄/Ma 谐和度 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 样品LQ4-1云母石英片岩 LQ4-1-01 559.99 254.68 2.20 0.0804 0.0023 2.0567 0.0677 0.1864 0.0064 1207 56.3 1135 22.5 1102 35.0 97% LQ4-1-02 45.14 141.96 0.32 0.0932 0.0028 2.3788 0.0865 0.1855 0.0068 1492 57.4 1236 26.0 1097 36.8 88% LQ4-1-03 115.85 482.46 0.24 0.0757 0.0021 1.7538 0.0562 0.1691 0.0059 1087 55.6 1029 20.7 1007 32.3 97% LQ4-1-04 160.55 359.47 0.45 0.1471 0.0056 6.4532 0.2523 0.3218 0.0110 2313 65.1 2040 34.4 1799 53.7 87% LQ4-1-05 81.78 472.72 0.17 0.0748 0.0022 1.5948 0.0525 0.1551 0.0054 1065 58.5 968 20.5 929 30.3 95% LQ4-1-06 179.44 287.07 0.63 0.1273 0.0036 5.9505 0.1921 0.3393 0.0117 2061 49.7 1969 28.1 1883 56.5 95% LQ4-1-07 204.83 573.38 0.36 0.0771 0.0022 1.4822 0.0453 0.1393 0.0045 1124 61.6 923 18.5 841 25.5 90% LQ4-1-08 483.41 455.68 1.06 0.0765 0.0022 1.8809 0.0628 0.1789 0.0065 1109 56.9 1074 22.1 1061 35.3 98% LQ4-1-09 173.26 260.80 0.66 0.0810 0.0024 1.8402 0.0625 0.1658 0.0060 1220 58.2 1060 22.4 989 33.1 93% LQ4-1-10 130.86 444.67 0.29 0.0965 0.0037 2.5081 0.0930 0.1903 0.0066 1567 72.2 1274 26.9 1123 35.5 87% LQ4-1-11 142.43 275.69 0.52 0.2573 0.0071 19.2335 0.6526 0.5385 0.0194 3231 43.2 3054 32.8 2777 81.5 90% LQ4-1-12 329.08 710.11 0.46 0.0704 0.0020 1.5205 0.0486 0.1557 0.0054 940 57.4 939 19.6 933 30.1 99% LQ4-1-13 206.84 457.55 0.45 0.0695 0.0020 1.4104 0.0458 0.1465 0.0051 922 58.2 893 19.3 881 28.9 98% LQ4-1-14 18.31 31.13 0.59 0.0791 0.0029 1.8393 0.0679 0.1690 0.0058 1176 76.9 1060 24.3 1006 32.1 94% LQ4-1-15 241.36 418.16 0.58 0.0694 0.0020 1.5182 0.0512 0.1572 0.0056 911 59.3 938 20.6 941 31.3 99% LQ4-1-16 34.10 123.23 0.28 0.0790 0.0024 2.0592 0.0698 0.1876 0.0066 1172 53.5 1135 23.2 1108 35.9 97% LQ4-1-17 86.47 46.09 1.88 0.2320 0.0066 19.6596 0.6343 0.6099 0.0211 3066 45.1 3075 31.2 3070 84.5 99% LQ4-1-18 204.60 318.95 0.64 0.0814 0.0023 2.1773 0.0730 0.1923 0.0067 1231 54.5 1174 23.3 1134 36.3 96% LQ4-1-19 311.89 234.39 1.33 0.0692 0.0020 1.3894 0.0458 0.1449 0.0050 906 61.1 884 19.5 872 28.0 98% LQ4-1-20 148.77 210.74 0.71 0.0816 0.0024 1.8728 0.0615 0.1654 0.0056 1237 51.7 1072 21.7 987 31.1 91% LQ4-1-21 132.58 195.31 0.68 0.0781 0.0023 1.7384 0.0562 0.1615 0.0054 1150 52.8 1023 20.9 965 30.2 94% LQ4-1-22 67.10 37.14 1.81 0.0741 0.0027 1.4235 0.0568 0.1398 0.0048 1043 74.1 899 23.8 844 27.3 93% LQ4-1-23 115.34 202.97 0.57 0.1766 0.0049 11.8155 0.3836 0.4846 0.0170 2621 46.3 2590 30.4 2547 73.7 98% LQ4-1-24 141.43 54.10 2.61 0.0872 0.0027 2.3291 0.0799 0.1948 0.0070 1366 63.9 1221 24.4 1147 37.9 93% LQ4-1-25 356.39 391.84 0.91 0.0745 0.0021 1.8809 0.0597 0.1826 0.0062 1054 57.4 1074 21.1 1081 33.6 99% LQ4-1-26 134.15 135.59 0.99 0.0613 0.0019 0.8480 0.0296 0.1006 0.0035 650 63.9 624 16.3 618 20.6 99% LQ4-1-27 153.61 431.93 0.36 0.0970 0.0027 2.3325 0.0724 0.1733 0.0056 1569 52.5 1222 22.1 1030 30.6 82% LQ4-1-28 110.71 197.88 0.56 0.0725 0.0022 1.7084 0.0559 0.1720 0.0060 1000 60.0 1012 21.0 1023 33.2 98% LQ4-1-29 114.37 179.13 0.64 0.1113 0.0033 4.7550 0.1627 0.3081 0.0104 1821 52.6 1777 28.7 1731 51.4 97% LQ4-1-30 233.89 151.93 1.54 0.0774 0.0027 1.5845 0.0686 0.1478 0.0052 1131 70.1 964 27.0 889 29.1 91% LQ4-1-31 149.59 188.08 0.80 0.0835 0.0024 2.5504 0.0810 0.2221 0.0076 1281 51.4 1287 23.2 1293 40.4 99% LQ4-1-32 55.49 174.03 0.32 0.1085 0.0030 4.8323 0.1563 0.3225 0.0111 1776 49.8 1791 27.2 1802 54.1 99% LQ4-1-33 93.38 120.63 0.77 0.0822 0.0024 2.3572 0.0778 0.2091 0.0074 1250 57.9 1230 23.6 1224 39.4 99% LQ4-1-34 131.99 192.69 0.69 0.0850 0.0025 2.3658 0.0818 0.2024 0.0074 1317 56.9 1232 24.7 1188 39.6 96% LQ4-1-35 144.77 253.08 0.57 0.1649 0.0046 10.4347 0.3438 0.4604 0.0167 2506 47.4 2474 30.6 2441 73.8 98% LQ4-1-36 383.32 244.26 1.57 0.0795 0.0023 1.9799 0.0649 0.1811 0.0063 1185 57.4 1109 22.1 1073 34.3 96% LQ4-1-37 446.68 535.73 0.83 0.0776 0.0021 1.9544 0.0585 0.1824 0.0058 1136 55.6 1100 20.1 1080 31.8 98% LQ4-1-38 107.18 64.93 1.65 0.0981 0.0029 3.7988 0.1254 0.2834 0.0100 1587 55.6 1592 26.5 1608 50.1 99% LQ4-1-39 178.70 216.48 0.83 0.0735 0.0021 1.5966 0.0534 0.1585 0.0056 1028 57.4 969 20.9 949 31.2 97% LQ4-1-40 169.88 489.41 0.35 0.0838 0.0023 2.4031 0.0733 0.2082 0.0068 1289 53.7 1244 21.9 1219 36.1 98% LQ4-1-41 80.00 154.38 0.52 0.1037 0.0030 3.6555 0.1178 0.2562 0.0087 1691 52.0 1562 25.7 1470 44.6 93% LQ4-1-42 138.24 299.81 0.46 0.0764 0.0022 1.7028 0.0567 0.1624 0.0058 1106 52.8 1010 21.3 970 32.3 96% LQ4-1-43 118.21 227.74 0.52 0.0757 0.0022 1.8885 0.0565 0.1816 0.0060 1087 57.4 1077 19.9 1076 32.6 99% LQ4-1-44 176.36 253.32 0.70 0.0799 0.0025 2.0802 0.0732 0.1877 0.0060 1194 61.3 1142 24.1 1109 32.7 97% LQ4-1-45 47.98 166.78 0.29 0.0713 0.0022 1.4689 0.0505 0.1499 0.0054 965 63.0 918 20.8 900 30.2 98% LQ4-1-46 46.53 91.67 0.51 0.0741 0.0023 1.6611 0.0554 0.1623 0.0055 1043 57.2 994 21.2 970 30.4 97% LQ4-1-47 81.82 209.43 0.39 0.0625 0.0018 0.9173 0.0332 0.1054 0.0037 692 63.0 661 17.6 646 21.6 97% LQ4-1-48 136.96 101.08 1.35 0.0695 0.0022 1.2757 0.0455 0.1327 0.0043 915 66.7 835 20.3 803 24.7 96% LQ4-1-49 43.78 67.58 0.65 0.1920 0.0052 14.1940 0.4267 0.5336 0.0169 2761 44.8 2763 28.6 2756 71.1 99% LQ4-1-50 71.08 95.83 0.74 0.1055 0.0030 4.2981 0.1332 0.2964 0.0099 1724 53.2 1693 25.6 1674 49.2 98% LQ4-1-51 106.75 197.79 0.54 0.1221 0.0045 4.4196 0.1822 0.2609 0.0087 1987 65.6 1716 34.2 1494 44.6 86% LQ4-1-52 228.82 258.15 0.89 0.0774 0.0022 1.9097 0.0581 0.1784 0.0056 1132 55.6 1084 20.3 1058 30.8 97% LQ4-1-53 301.59 225.29 1.34 0.0819 0.0023 2.4796 0.0786 0.2194 0.0073 1244 55.6 1266 23.0 1279 38.6 99% LQ4-1-54 96.79 202.01 0.48 0.0731 0.0021 1.7068 0.0555 0.1684 0.0056 1017 54.6 1011 20.8 1004 30.8 99% LQ4-1-55 46.91 499.70 0.09 0.1252 0.0036 3.4620 0.1098 0.1996 0.0066 2032 51.7 1519 25.0 1173 35.3 74% LQ4-1-56 71.72 145.37 0.49 0.2912 0.0083 27.2548 0.9240 0.6781 0.0247 3424 44.4 3393 33.3 3337 94.9 98% LQ4-1-57 265.04 355.55 0.75 0.0832 0.0023 2.4369 0.0755 0.2103 0.0066 1273 54.8 1254 22.3 1231 35.4 98% LQ4-1-58 157.19 176.33 0.89 0.0651 0.0020 1.0556 0.0363 0.1172 0.0040 777 66.7 732 17.9 714 22.8 97% LQ4-1-59 10.03 35.88 0.28 0.1650 0.0108 3.3049 0.3007 0.1292 0.0050 2507 111 1482 70.9 783 28.6 38% LQ4-1-60 259.77 334.56 0.78 0.0728 0.0021 1.6130 0.0489 0.1597 0.0051 1009 57.4 975 19.0 955 28.1 97% 样品LQ9-2黑云斜长片麻岩 LQ9-2-01 106 270 0.39 0.0689 0.0021 1.5026 0.0595 0.1614 0.0071 894 67.6 931 24.2 965 39.2 96% LQ9-2-02 489 1153 0.42 0.0735 0.0022 1.8001 0.0698 0.1821 0.0080 1028 61.1 1046 25.3 1079 43.5 96% LQ9-2-03 189 289 0.66 0.0747 0.0024 1.6893 0.0677 0.1686 0.0076 1061 63.7 1004 25.6 1005 41.7 99% LQ9-2-04 102 278 0.37 0.0717 0.0027 1.4032 0.0571 0.1500 0.0069 976 77.8 890 24.1 901 38.5 98% LQ9-2-05 165 378 0.44 0.0762 0.0027 1.9919 0.0801 0.1978 0.0090 1099 70.4 1113 27.2 1163 48.5 95% LQ9-2-06 375 874 0.43 0.0729 0.0022 1.8097 0.0693 0.1827 0.0078 1013 61.1 1049 25.0 1082 42.6 96% LQ9-2-07 47.2 358 0.13 0.0723 0.0022 1.8336 0.0720 0.1875 0.0082 994 61.9 1058 25.8 1108 44.3 95% LQ9-2-08 129 293 0.44 0.0725 0.0024 1.5119 0.0593 0.1564 0.0070 1000 66.7 935 24.0 937 38.9 99% LQ9-2-09 195 213 0.91 0.0771 0.0024 2.0074 0.0782 0.1928 0.0083 1124 61.1 1118 26.4 1137 44.8 98% LQ9-2-10 38.9 88.6 0.44 0.1847 0.0058 10.4433 0.4208 0.4225 0.0192 2695 51.5 2475 37.4 2272 87.0 91% LQ9-2-11 571 1593 0.36 0.0726 0.0023 1.0680 0.0512 0.1087 0.0055 1011 64.1 738 25.1 665 31.8 89% LQ9-2-12 78.5 170 0.46 0.0756 0.0025 2.0259 0.0785 0.1955 0.0084 1083 66.7 1124 26.4 1151 45.1 97% LQ9-2-13 250 331 0.76 0.0746 0.0023 1.8008 0.0688 0.1807 0.0078 1057 63.0 1046 25.0 1071 42.7 97% LQ9-2-14 41.3 344 0.12 0.0742 0.0025 1.5156 0.0618 0.1543 0.0071 1056 72.4 937 25.0 925 39.4 98% LQ9-2-15 57.7 396 0.15 0.0734 0.0025 1.7906 0.0733 0.1765 0.0082 1033 69.0 1042 26.7 1048 44.8 99% LQ9-2-16 106 272 0.39 0.0717 0.0022 1.7044 0.0723 0.1764 0.0082 989 63.0 1010 27.1 1048 44.8 96% LQ9-2-17 229 435 0.53 0.0730 0.0023 1.6958 0.0664 0.1732 0.0077 1017 63.0 1007 25.0 1030 42.3 97% LQ9-2-18 107 175 0.61 0.0790 0.0025 1.7013 0.0688 0.1613 0.0073 1172 64.3 1009 25.9 964 40.4 95% LQ9-2-19 499 1478 0.34 0.0680 0.0021 1.1249 0.0454 0.1229 0.0056 878 -134.3 765 21.7 747 31.9 97% LQ9-2-20 165 119 1.38 0.0722 0.0024 1.6959 0.0713 0.1762 0.0081 992 67.4 1007 26.9 1046 44.2 96% LQ9-2-21 264 544 0.49 0.0768 0.0025 1.8855 0.0693 0.1848 0.0076 1117 68.7 1076 24.4 1093 41.1 98% LQ9-2-22 179 519 0.34 0.0721 0.0023 1.6444 0.0634 0.1700 0.0074 989 63.0 987 24.3 1012 40.8 97% LQ9-2-23 97.0 204 0.47 0.0771 0.0026 1.9042 0.0765 0.1857 0.0083 1124 68.5 1083 26.8 1098 45.1 98% LQ9-2-24 253 531 0.48 0.0639 0.0020 1.0522 0.0428 0.1224 0.0055 737 263.9 730 21.2 744 31.8 98% LQ9-2-25 64.3 687 0.09 0.0785 0.0028 1.8792 0.0720 0.1834 0.0083 1159 70.8 1074 25.4 1086 45.4 98% LQ9-2-26 246 460 0.54 0.0789 0.0027 1.8782 0.0732 0.1804 0.0081 1170 66.7 1073 25.8 1069 44.2 99% LQ9-2-27 93.8 189 0.50 0.0771 0.0026 2.0218 0.0817 0.1970 0.0088 1124 66.7 1123 27.5 1159 47.6 96% LQ9-2-28 140 232 0.60 0.0767 0.0026 2.0608 0.0873 0.2003 0.0093 1122 66.7 1136 29.0 1177 49.7 96% LQ9-2-29 57.4 233 0.25 0.0836 0.0028 2.0072 0.0853 0.1798 0.0079 1283 65.0 1118 28.8 1066 43.1 95% LQ9-2-30 111 352 0.31 0.0815 0.0035 2.1551 0.1251 0.1961 0.0077 1233 84.1 1167 40.3 1154 41.5 98% LQ9-2-31 157 147 1.07 0.0774 0.0028 2.0026 0.0785 0.1977 0.0088 1131 72.7 1116 26.6 1163 47.3 95% LQ9-2-32 111 356 0.31 0.0767 0.0024 1.9850 0.0748 0.1944 0.0082 1122 63.0 1110 25.5 1145 44.2 96% LQ9-2-33 254 475 0.53 0.1089 0.0033 5.0738 0.1931 0.3476 0.0147 1781 56.0 1832 32.3 1923 70.3 95% LQ9-2-34 52.1 235 0.22 0.0635 0.0021 1.0166 0.0411 0.1203 0.0053 726 70.4 712 20.7 733 30.6 97% LQ9-2-35 102 263 0.39 0.0663 0.0024 1.0046 0.0399 0.1154 0.0051 817 74.8 706 20.2 704 29.5 99% LQ9-2-36 109 214 0.51 0.1180 0.0036 5.9561 0.2292 0.3782 0.0164 1926 55.2 1969 33.5 2068 76.7 95% LQ9-2-37 93.6 221 0.42 0.1262 0.0042 6.2453 0.2476 0.3760 0.0170 2056 58.2 2011 34.7 2057 79.7 97% LQ9-2-38 320 394 0.81 0.0838 0.0039 2.0128 0.0752 0.1875 0.0081 1289 90.0 1120 25.4 1108 44.1 98% LQ9-2-39 339 569 0.60 0.0831 0.0026 2.5151 0.1036 0.2279 0.0108 1272 60.3 1276 30.0 1324 56.5 96% LQ9-2-40 127 409 0.31 0.0772 0.0027 1.8126 0.0680 0.1787 0.0076 1128 70.8 1050 24.6 1060 41.7 99% LQ9-2-41 232 638 0.36 0.0634 0.0022 0.9458 0.0348 0.1135 0.0048 722 69.4 676 18.2 693 27.7 97% LQ9-2-42 57.6 94.7 0.61 0.0784 0.0030 1.7192 0.0711 0.1711 0.0080 1167 75.9 1016 26.5 1018 44.3 99% LQ9-2-43 322 618 0.52 0.1117 0.0041 4.4724 0.1539 0.3072 0.0123 1827 65.6 1726 28.6 1727 60.5 99% LQ9-2-44 142 258 0.55 0.0799 0.0030 1.8938 0.0732 0.1884 0.0088 1194 74.1 1079 25.7 1113 48.0 96% LQ9-2-45 150 318 0.47 0.0629 0.0023 0.8312 0.0330 0.1010 0.0044 706 77.8 614 18.3 620 25.6 98% LQ9-2-46 67.1 68.0 0.99 0.0836 0.0036 1.9009 0.0865 0.1712 0.0069 1283 83.3 1081 30.3 1019 37.7 94% LQ9-2-47 143 147 0.97 0.1057 0.0037 3.9076 0.1546 0.2856 0.0130 1726 63.4 1615 32.0 1620 65.4 99% LQ9-2-48 488 549 0.89 0.0774 0.0027 1.9473 0.0690 0.1913 0.0077 1131 102.8 1098 23.8 1128 41.8 97% LQ9-2-49 78.8 362 0.22 0.0839 0.0031 2.2412 0.0907 0.2052 0.0093 1300 72.2 1194 28.4 1203 49.9 99% LQ9-2-50 357 573 0.62 0.0753 0.0025 1.7641 0.0641 0.1756 0.0071 1077 66.2 1032 23.6 1043 38.9 98% LQ9-2-51 164 357 0.46 0.0764 0.0027 1.8613 0.0711 0.1865 0.0081 1106 72.2 1067 25.2 1102 43.8 96% LQ9-2-52 54.4 87.2 0.62 0.0777 0.0030 1.8574 0.0776 0.1892 0.0092 1139 76.4 1066 27.6 1117 49.7 95% LQ9-2-53 113 239 0.47 0.0760 0.0030 1.7717 0.0696 0.1827 0.0086 1094 79.6 1035 25.5 1082 46.7 95% LQ9-2-54 33.2 214 0.15 0.0644 0.0023 1.0340 0.0426 0.1231 0.0056 755 74.1 721 21.3 748 32.0 96% LQ9-2-55 65.6 139 0.47 0.1263 0.0046 5.0466 0.2008 0.3067 0.0142 2047 63.1 1827 33.7 1724 69.8 94% LQ9-2-56 46.6 77.0 0.60 0.2123 0.0084 16.4084 0.6777 0.5994 0.0281 2923 64.7 2901 39.6 3027 113 95% LQ9-2-57 114 299 0.38 0.0790 0.0031 1.8590 0.0737 0.1813 0.0081 1172 76.7 1067 26.2 1074 44.1 99% LQ9-2-58 278 530 0.52 0.0720 0.0024 1.6646 0.0672 0.1737 0.0077 987 66.7 995 25.6 1033 42.4 96% LQ9-2-59 71.8 110 0.65 0.0610 0.0021 0.8506 0.0358 0.1056 0.0048 639 78.7 625 19.6 647 27.8 96% LQ9-2-60 497 1131 0.44 0.1182 0.0038 4.7732 0.2241 0.2970 0.0133 1929 57.4 1780 39.4 1676 66.1 93% 样品LQ29-1云母石英片岩 LQ29-1-01 310 105 2.96 0.0996 0.0028 3.6254 0.1117 0.2634 0.0077 1617 57.6 1555 24.5 1507 39.4 96% LQ29-1-02 204 267 0.76 0.1119 0.0030 4.8457 0.1400 0.3145 0.0092 1831 49.8 1793 24.4 1763 45.3 98% LQ29-1-03 271 426 0.64 0.1694 0.0047 11.3197 0.3235 0.4843 0.0139 2554 46.1 2550 26.7 2546 60.3 99% LQ29-1-04 135 241 0.56 0.0729 0.0021 1.6966 0.0507 0.1691 0.0049 1011 89.8 1007 19.1 1007 27.2 99% LQ29-1-05 167 238 0.70 0.0685 0.0020 1.2286 0.0365 0.1300 0.0037 885 54.6 814 16.7 788 21.0 96% LQ29-1-06 41.2 1118 0.04 0.1369 0.0037 5.7240 0.1623 0.3023 0.0085 2189 47.2 1935 24.5 1703 42.3 87% LQ29-1-07 410 219 1.87 0.0711 0.0022 1.5625 0.0461 0.1564 0.0045 961 62.2 955 18.3 937 24.9 98% LQ29-1-08 90.2 155 0.58 0.0902 0.0025 3.1469 0.0914 0.2517 0.0072 1429 52.3 1444 22.4 1447 37.2 99% LQ29-1-09 198 252 0.79 0.1647 0.0045 10.9517 0.3256 0.4787 0.0144 2505 45.7 2519 27.7 2522 62.8 99% LQ29-1-10 152 287 0.53 0.0706 0.0020 1.6251 0.0487 0.1652 0.0049 946 58.5 980 18.8 986 27.2 99% LQ29-1-11 71.1 177 0.40 0.0882 0.0025 2.7298 0.0862 0.2221 0.0068 1388 55.1 1337 23.5 1293 35.9 96% LQ29-1-12 573 338 1.70 0.0575 0.0017 0.7775 0.0243 0.0972 0.0029 522 60.2 584 13.9 598 16.8 97% LQ29-1-13 150 329 0.46 0.0707 0.0020 1.6276 0.0479 0.1657 0.0047 950 52.8 981 18.5 988 26.1 99% LQ29-1-14 240 351 0.68 0.1572 0.0043 9.7470 0.2813 0.4469 0.0127 2426 41.7 2411 26.6 2382 56.8 98% LQ29-1-15 188 249 0.75 0.1572 0.0044 9.5542 0.2823 0.4399 0.0130 2428 41.8 2393 27.2 2350 58.0 98% LQ29-1-16 283 462 0.61 0.0698 0.0020 1.5568 0.0469 0.1614 0.0047 920 63.9 953 18.6 964 25.9 98% LQ29-1-17 1536 1639 0.94 0.0689 0.0019 1.4550 0.0418 0.1523 0.0043 898 57.4 912 17.3 914 24.0 99% LQ29-1-18 152 338 0.45 0.1928 0.0082 11.9047 0.5764 0.4405 0.0137 2766 69.4 2597 45.4 2353 61.3 90% LQ29-1-19 56.8 349 0.16 0.1583 0.0043 10.1302 0.2865 0.4624 0.0133 2439 45.7 2447 26.2 2450 58.7 99% LQ29-1-20 68.5 1133 0.06 0.1458 0.0039 7.8360 0.2237 0.3875 0.0112 2298 46.3 2212 25.7 2111 51.8 95% LQ29-1-21 257 1858 0.14 0.1752 0.0047 9.3753 0.3131 0.3832 0.0124 2609 44.5 2375 30.7 2091 57.7 87% LQ29-1-22 613 696 0.88 0.0933 0.0025 3.1444 0.0890 0.2432 0.0070 1494 50.8 1444 21.8 1403 36.4 97% LQ29-1-23 65.8 195 0.34 0.0715 0.0020 1.5313 0.0462 0.1542 0.0044 972 52.8 943 18.5 924 24.4 98% LQ29-1-24 250 57.4 4.36 0.1670 0.0047 11.1201 0.3262 0.4812 0.0141 2528 48.0 2533 27.4 2533 61.2 99% LQ29-1-25 223 397 0.56 0.1665 0.0046 10.7705 0.3097 0.4665 0.0134 2524 46.3 2504 26.8 2468 59.1 98% LQ29-1-26 60.8 63.7 0.95 0.0791 0.0033 1.8732 0.0893 0.1702 0.0053 1176 78.7 1072 31.6 1013 29.0 94% LQ29-1-27 202 395 0.51 0.0836 0.0023 2.3417 0.0663 0.2024 0.0057 1283 53.7 1225 20.2 1188 30.6 96% LQ29-1-28 92.5 243 0.38 0.1142 0.0031 5.2648 0.1489 0.3325 0.0093 1933 49.2 1863 24.2 1850 44.9 99% LQ29-1-29 194 211 0.92 0.2449 0.0066 21.2825 0.6063 0.6280 0.0180 3154 42.6 3152 27.7 3142 71.4 99% LQ29-1-30 229 92.3 2.48 0.0605 0.0021 0.7705 0.0270 0.0924 0.0026 620 75.9 580 15.5 570 15.6 98% LQ29-1-31 230 264 0.87 0.1687 0.0045 11.4389 0.3181 0.4906 0.0137 2546 45.8 2560 26.0 2573 59.1 99% LQ29-1-32 18.8 36.6 0.51 0.2567 0.0080 23.0052 0.6716 0.6701 0.0225 3228 49.4 3227 28.5 3306 87.0 97% LQ29-1-33 218 324 0.67 0.2485 0.0066 21.4150 0.6003 0.6239 0.0176 3175 42.3 3158 27.3 3126 70.1 98% LQ29-1-34 37.0 87.3 0.42 0.1758 0.0049 12.2837 0.3496 0.5074 0.0145 2614 45.2 2626 26.8 2645 62.2 99% LQ29-1-35 80.8 257 0.31 0.0800 0.0023 2.2865 0.0682 0.2073 0.0061 1198 55.9 1208 21.1 1215 32.6 99% LQ29-1-36 84.1 41.1 2.05 0.0586 0.0028 0.7694 0.0375 0.0955 0.0029 554 99.1 579 21.5 588 17.1 98% LQ29-1-37 186 327 0.57 0.1667 0.0045 10.7695 0.3092 0.4676 0.0135 2525 45.4 2503 26.7 2473 59.2 98% LQ29-1-38 1445 448 3.23 0.0723 0.0020 1.6399 0.0485 0.1638 0.0047 994 55.6 986 18.7 978 25.9 99% LQ29-1-39 2.59 171 0.02 0.2586 0.0069 23.2098 0.6570 0.6489 0.0184 3238 42.3 3236 27.6 3224 71.9 99% LQ29-1-40 448 422 1.06 0.0960 0.0026 3.7347 0.1059 0.2817 0.0080 1548 51.2 1579 22.7 1600 40.5 98% LQ29-1-41 114 157 0.73 0.1255 0.0034 6.5494 0.1889 0.3774 0.0108 2036 47.8 2053 25.4 2064 50.5 99% LQ29-1-42 297 268 1.11 0.1630 0.0045 9.7263 0.2773 0.4313 0.0120 2487 46.3 2409 26.3 2312 54.1 95% LQ29-1-43 117 550 0.21 0.2244 0.0060 16.2257 0.4556 0.5229 0.0147 3013 42.9 2890 26.9 2712 62.2 93% LQ29-1-44 264 98.5 2.68 0.1060 0.0030 4.1622 0.1236 0.2847 0.0081 1731 52.9 1667 24.3 1615 40.7 96% LQ29-1-45 102 160 0.63 0.0937 0.0027 3.1110 0.0936 0.2402 0.0069 1503 59.4 1435 23.1 1388 35.8 96% LQ29-1-46 217 132 1.64 0.0712 0.0021 1.6028 0.0521 0.1626 0.0047 965 65.7 971 20.3 971 26.1 99% LQ29-1-47 40.2 66.2 0.61 0.0738 0.0024 1.6698 0.0571 0.1639 0.0048 1037 65.9 997 21.7 978 26.7 98% LQ29-1-48 205 290 0.71 0.1641 0.0044 10.2827 0.2927 0.4542 0.0131 2498 44.6 2461 26.4 2414 58.0 98% LQ29-1-49 111 431 0.26 0.2464 0.0066 21.0147 0.6035 0.6168 0.0176 3161 42.6 3139 27.9 3097 70.1 98% LQ29-1-50 78.5 279 0.28 0.0753 0.0021 1.8499 0.0551 0.1783 0.0052 1076 57.0 1063 19.6 1058 28.7 99% LQ29-1-51 185 718 0.26 0.1596 0.0043 9.3499 0.2690 0.4230 0.0122 2454 46.1 2373 26.4 2274 55.1 95% LQ29-1-52 253 492 0.51 0.0973 0.0027 3.7381 0.1060 0.2806 0.0089 1573 56.5 1580 22.7 1594 45.0 99% LQ29-1-53 167 290 0.57 0.0721 0.0020 1.6851 0.0501 0.1688 0.0049 989 62.0 1003 19.0 1005 26.8 99% LQ29-1-54 53.0 41.0 1.29 0.0650 0.0026 1.1964 0.0478 0.1346 0.0042 772 83.3 799 22.1 814 23.6 98% LQ29-1-55 182 335 0.54 0.0720 0.0021 1.6519 0.0492 0.1665 0.0050 987 63.9 990 18.9 993 27.6 99% LQ29-1-56 228 412 0.55 0.3446 0.0096 36.4424 1.0711 0.7642 0.0227 3683 42.6 3679 29.2 3659 82.9 99% LQ29-1-57 625 464 1.35 0.0651 0.0019 1.1186 0.0333 0.1244 0.0037 776 59.3 762 16.0 756 21.0 99% LQ29-1-58 98.4 96.3 1.02 0.0731 0.0023 1.6393 0.0516 0.1622 0.0048 1018 63.0 985 19.9 969 26.5 98% LQ29-1-59 4.62 27.4 0.17 0.1720 0.0050 10.9828 0.3393 0.4613 0.0138 2577 48.8 2522 28.8 2445 60.9 96% LQ29-1-60 64.4 365 0.18 0.0808 0.0022 2.3715 0.0715 0.2109 0.0062 1217 54.2 1234 21.5 1234 33.2 99% 样品LQ18-1黑云斜长片麻岩 LQ18-1-1 482 879 0.55 0.0646 0.0018 1.3821 0.0397 0.1546 0.0040 761 61.11 881 16.95 927 22.46 94% LQ18-1-2 80.5 218 0.37 0.1638 0.0046 10.3624 0.2903 0.4573 0.0120 2495 47.38 2468 26.00 2427 53.04 98% LQ18-1-3 184 590 0.31 0.0657 0.0019 1.3482 0.0388 0.1484 0.0039 798 56.48 867 16.79 892 21.81 97% LQ18-1-4 73.0 444 0.16 0.0864 0.0024 3.1053 0.1042 0.2586 0.0078 1348 59.42 1434 25.79 1483 40.03 96% LQ18-1-5 176 191 0.93 0.1161 0.0033 5.4238 0.1568 0.3372 0.0088 1898 45.53 1889 24.83 1873 42.56 99% LQ18-1-6 235 533 0.44 0.0681 0.0020 1.5706 0.0451 0.1667 0.0043 872 59.26 959 17.84 994 24.03 96% LQ18-1-7 94.4 204 0.46 0.0951 0.0028 3.5184 0.1165 0.2663 0.0077 1531 55.56 1531 26.20 1522 39.00 99% LQ18-1-8 101 217 0.47 0.0628 0.0021 0.9742 0.0323 0.1122 0.0030 700 70.36 691 16.63 686 17.45 99% LQ18-1-9 105 108 0.97 0.1004 0.0031 3.8646 0.1186 0.2786 0.0073 1631 57.56 1606 24.78 1584 37.03 98% LQ18-1-10 146 314 0.47 0.0649 0.0021 1.2512 0.0400 0.1393 0.0037 772 68.51 824 18.07 841 21.02 97% LQ18-1-11 96.5 547 0.18 0.0706 0.0020 1.7103 0.0506 0.1747 0.0046 946 59.26 1012 18.97 1038 25.29 97% LQ18-1-12 51.3 231 0.22 0.0772 0.0023 1.9358 0.0578 0.1811 0.0047 1126 58.80 1094 20.01 1073 25.78 98% LQ18-1-13 73.1 182 0.40 0.1501 0.0042 8.0793 0.2297 0.3888 0.0102 2347 48.15 2240 25.73 2117 47.56 94% LQ18-1-14 1425 798 1.79 0.0566 0.0017 0.7235 0.0217 0.0924 0.0024 476 66.66 553 12.77 570 14.19 96% LQ18-1-15 219 593 0.37 0.1779 0.0050 8.8489 0.2574 0.3588 0.0095 2633 46.14 2323 26.58 1976 45.00 83% LQ18-1-16 96.3 231 0.42 0.0719 0.0023 1.5384 0.0498 0.1544 0.0041 983 64.51 946 19.93 926 22.96 97% LQ18-1-17 310 484 0.64 0.0658 0.0020 1.3491 0.0399 0.1484 0.0039 1200 58.33 867 17.25 892 21.73 97% LQ18-1-18 174 156 1.11 0.0580 0.0021 0.7294 0.0258 0.0913 0.0025 532 77.77 556 15.16 563 14.74 98% LQ18-1-19 208 241 0.86 0.0690 0.0021 1.5506 0.0477 0.1626 0.0043 898 62.97 951 19.01 971 23.68 97% LQ18-1-20 254 424 0.60 0.0773 0.0022 1.6880 0.0570 0.1575 0.0048 1131 57.41 1004 21.54 943 26.87 93% LQ18-1-21 198 853 0.23 0.1185 0.0032 5.3684 0.1482 0.3277 0.0085 1933 48.76 1880 23.66 1827 41.31 97% LQ18-1-22 118 370 0.32 0.0697 0.0020 1.5502 0.0450 0.1611 0.0043 920 63.89 951 17.92 963 23.71 98% LQ18-1-23 235 301 0.78 0.0568 0.0018 0.6963 0.0223 0.0889 0.0024 483 70.37 537 13.37 549 14.02 97% LQ18-1-24 118 296 0.40 0.0844 0.0028 1.8370 0.0977 0.1521 0.0064 1302 64.05 1059 34.97 913 35.64 85% LQ18-1-25 260 181 1.44 0.0956 0.0028 3.5968 0.1060 0.2727 0.0073 1540 55.09 1549 23.44 1554 36.79 99% LQ18-1-26 66.8 136 0.49 0.1549 0.0044 8.6848 0.2550 0.4062 0.0111 2800 47.06 2305 26.79 2197 50.92 95% LQ18-1-27 34.7 378 0.09 0.0708 0.0021 1.5376 0.0469 0.1573 0.0043 952 55.40 946 18.78 942 23.85 99% LQ18-1-28 504 353 1.43 0.0831 0.0024 2.5717 0.0788 0.2240 0.0063 1272 54.47 1293 22.42 1303 33.06 99% LQ18-1-29 169 386 0.44 0.0634 0.0019 1.1508 0.0353 0.1313 0.0035 720 62.96 778 16.69 796 19.89 97% LQ18-1-30 136 178 0.77 0.0754 0.0023 1.7128 0.0528 0.1647 0.0043 1080 62.97 1013 19.76 983 23.92 96% LQ18-1-31 114 114 1.01 0.0648 0.0021 1.2386 0.0403 0.1390 0.0038 769 68.51 818 18.29 839 21.43 97% LQ18-1-32 101 148 0.68 0.1023 0.0030 3.8019 0.1130 0.2694 0.0072 1666 54.79 1593 23.92 1538 36.63 96% LQ18-1-33 136 287 0.47 0.1520 0.0042 7.6083 0.2141 0.3619 0.0095 2369 47.99 2186 25.29 1991 44.76 90% LQ18-1-34 102 202 0.51 0.0689 0.0022 1.2838 0.0401 0.1351 0.0035 894 65.28 839 17.82 817 20.15 97% LQ18-1-35 83.5 152 0.55 0.2203 0.0062 17.3651 0.5065 0.5696 0.0153 2982 45.06 2955 28.08 2906 62.92 98% LQ18-1-36 70.0 299 0.23 0.1491 0.0042 9.1964 0.2584 0.4456 0.0117 2336 47.84 2358 25.78 2376 52.35 99% LQ18-1-37 28.5 55.7 0.51 0.0683 0.0029 1.4040 0.0624 0.1496 0.0045 876 89.96 891 26.38 899 25.24 99% LQ18-1-38 665 570 1.17 0.0903 0.0026 3.1568 0.0891 0.2523 0.0065 1432 55.09 1447 21.80 1450 33.69 99% LQ18-1-39 955 622 1.54 0.0577 0.0018 0.7328 0.0228 0.0918 0.0024 517 65.73 558 13.37 566 14.32 98% LQ18-1-40 316 890 0.35 0.0584 0.0018 0.8263 0.0248 0.1021 0.0027 546 66.66 612 13.81 627 15.93 97% LQ18-1-41 390 619 0.63 0.0959 0.0028 3.8228 0.1120 0.2880 0.0078 1546 55.56 1598 23.61 1631 38.94 97% LQ18-1-42 355 481 0.74 0.0631 0.0020 0.9296 0.0294 0.1064 0.0029 722 60.95 667 15.47 652 17.19 97% LQ18-1-43 75.7 320 0.24 0.1237 0.0037 5.0269 0.2198 0.2883 0.0113 2010 47.37 1824 37.05 1633 56.35 88% LQ18-1-44 508 491 1.03 0.1576 0.0044 9.2072 0.2601 0.4215 0.0112 2431 47.06 2359 25.93 2267 50.99 96% LQ18-1-45 167 278 0.60 0.1122 0.0032 5.0654 0.1431 0.3260 0.0086 1836 51.85 1830 23.98 1819 41.64 99% LQ18-1-46 68.9 190 0.36 0.0850 0.0026 2.7530 0.1039 0.2331 0.0076 1317 59.27 1343 28.12 1350 39.91 99% LQ18-1-47 116 1275 0.09 0.0684 0.0019 1.3043 0.0370 0.1376 0.0036 883 58.49 848 16.32 831 20.61 98% LQ18-1-48 54.0 123 0.44 0.0797 0.0026 1.7143 0.0561 0.1557 0.0042 1191 65.28 1014 20.99 933 23.44 91% LQ18-1-49 227 167 1.36 0.1558 0.0044 9.1593 0.2614 0.4245 0.0112 2411 48.45 2354 26.18 2281 50.70 96% LQ18-1-50 290 128 2.27 0.0700 0.0024 1.2144 0.0415 0.1256 0.0034 928 70.38 807 19.05 763 19.47 94% LQ18-1-51 54.7 412 0.13 0.0725 0.0021 1.6906 0.0493 0.1686 0.0045 998 59.26 1005 18.61 1004 24.67 99% LQ18-1-52 201 403 0.50 0.0674 0.0020 1.4611 0.0429 0.1566 0.0041 850 60.03 914 17.70 938 23.09 97% LQ18-1-53 74.3 383 0.19 0.1379 0.0039 4.4004 0.1278 0.2303 0.0062 2211 49.23 1712 24.06 1336 32.37 75% LQ18-1-54 149 401 0.37 0.0841 0.0024 2.6550 0.0749 0.2281 0.0059 1294 55.55 1316 20.82 1325 31.18 99% LQ18-1-55 101 256 0.39 0.1021 0.0030 3.5096 0.1069 0.2480 0.0067 1662 54.78 1529 24.10 1428 34.69 93%
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表 3 龙泉岩群变沉积岩基质主量元素组成
Table 3. Composition of major element for the Longquan Group meta-sedimentary matrix
% 样品号 LQ4－1 LQ29－1 LQ8－1 LQ108－2 LQ13－2 LQ9－2 LQ112－1 岩性 云母石英片岩 云母石英片岩 云母石英片岩 云母石英片岩 变长石石英砂岩 黑云斜长片麻岩 黑云斜长片麻岩 SiO2 74.25 74.98 69.37 75.51 76.25 62.03 74.96 Al2O3 11.35 11.52 13.70 7.43 12.59 16.32 9.64 CaO 0.76 0.32 1.43 2.27 0.04 1.60 1.58 Fe2O3 2.67 1.27 1.34 0.54 3.06 1.60 2.17 FeO 2.12 2.84 3.48 3.92 0.90 4.42 3.09 K2O 3.08 3.24 3.56 2.12 2.81 4.35 1.94 MgO 1.79 1.88 1.81 2.92 0.65 3.66 1.98 MnO 0.06 0.06 0.05 0.16 0.04 0.05 0.08 Na2O 1.13 1.15 2.93 0.30 ＜0.01 1.44 1.12 P2O5 0.19 0.16 0.19 0.16 0.04 0.14 0.12 TiO2 0.52 0.58 0.75 0.44 0.49 0.74 0.6 烧失量 1.73 1.96 0.78 3.24 2.94 1.96 1.53 总计 99.65 99.96 99.39 99.01 99.82 98.31 98.81 TFe2O3 5.13 4.52 5.28 5.11 4.06 6.76 5.76 Na2O+K2O 4.21 4.39 6.49 2.42 5.79 3.06 DF值 -4.78 -4.96 -0.58 -7.01 -5.95 -2.93 -5.48 注：TFe2O3= Fe2O3+(FeO×1.111)
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表 4 龙泉岩群变沉积岩基质全岩稀土和微量元素组成
Table 4. Composition of trace and rare earth elements for meta-sedimentary rocks in the Longquan Group
10-6 样品号 LQ4－1 LQ29－1 LQ8－1 LQ108－2 LQ13－2 LQ9－2 LQ112－1 岩性 云母石英片岩 云母石英片岩 云母石英片岩 云母石英片岩 变长石石英砂岩 黑云斜长片麻岩 黑云斜长片麻岩 La 31.60 41.30 56.70 22.30 47.30 40.10 35.40 Ce 63.00 75.70 105.00 47.90 72.20 77.70 66.80 Pr 7.06 9.09 12.30 4.89 10.30 9.39 7.57 Nd 25.50 33.70 47.00 19.00 37.20 35.80 31.30 Sm 5.16 6.23 8.47 4.10 6.40 7.10 6.17 Eu 1.05 1.31 1.49 0.92 0.85 1.32 1.27 Gd 4.97 5.87 7.42 3.19 5.26 6.39 5.03 Tb 0.83 0.89 1.09 0.51 0.78 0.97 0.77 Dy 5.24 5.26 6.35 3.10 4.46 5.82 4.75 Ho 1.11 1.07 1.33 0.59 0.88 1.18 0.89 Er 3.00 2.86 3.51 1.72 2.33 3.13 2.62 Tm 0.46 0.45 0.54 0.24 0.36 0.49 0.38 Yb 3.02 2.92 3.54 1.62 2.42 3.30 2.48 Lu 0.45 0.44 0.52 0.24 0.36 0.50 0.37 Sc 11.90 9.61 12.00 12.30 7.91 16.80 11.30 ∑REE 152.45 187.09 255.26 110.32 191.10 193.19 165.80 LREE/HREE 6.99 8.47 9.50 8.84 10.34 7.87 8.59 (La/Yb)N 7.51 10.15 11.49 9.87 14.02 8.72 10.24 (La/Sm)N 3.95 4.28 4.32 3.51 4.77 3.65 3.70 (Gd/Yb)N 1.36 1.66 1.73 1.63 1.80 1.60 1.68 δEu 0.63 0.65 0.56 0.75 0.43 0.59 0.68 δCe 0.99 0.92 0.93 1.08 0.77 0.95 0.95 V 73.60 64.20 82.80 93.90 40.60 120.00 77.70 Ni 40.00 27.80 31.50 46.60 35.90 57.40 30.70 Co 15.70 11.70 12.20 27.50 8.73 20.40 12.60 Rb 96.00 142.00 196.00 97.60 140.00 196.00 105.00 Ba 512.00 554.00 719.00 628.00 466.00 784.00 454.00 Th 12.80 16.80 25.40 9.32 17.40 16.10 12.60 U 1.52 2.40 4.52 2.06 3.55 3.54 1.75 Nb 9.99 11.40 14.60 11.70 11.00 12.90 8.93 Sr 64.80 67.00 202.00 58.80 16.20 138.00 130.00 Zr 114.00 294.00 364.00 77.10 204.00 176.00 216.00 Hf 3.72 8.08 9.88 2.35 6.05 5.53 6.48 Y 27.50 27.90 34.20 14.70 24.70 30.60 23.90 Ta 0.84 0.94 1.21 0.79 0.93 1.09 0.78 Pb 18.50 21.40 15.40 14.50 31.00 17.40 33.40 注： $ \delta \mathrm{Eu}=\frac{\mathrm{Eu}_{\mathrm{N}}}{0.5\left(\mathrm{Sm}_{\mathrm{N}}+\mathrm{Gd}_{\mathrm{N}}\right)} ; \delta \mathrm{Ce}=\frac{\mathrm{Ce}_{\mathrm{N}}}{0.5\left(\mathrm{La}_{\mathrm{N}}+\mathrm{Pr}_{\mathrm{N}}\right)}$ ; 标准化值均采用C1球粒陨石标准化[27]
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