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桂北地区丹洲群碎屑锆石LA-ICP-MS U-Pb年龄和Hf同位素特征及其地质意义

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寇彩化, 刘燕学, 李廷栋, 黄河, 张恒. 桂北地区丹洲群碎屑锆石LA-ICP-MS U-Pb年龄和Hf同位素特征及其地质意义[J]. 地质通报, 2017, 36(8): 1393-1406.
引用本文: 寇彩化, 刘燕学, 李廷栋, 黄河, 张恒. 桂北地区丹洲群碎屑锆石LA-ICP-MS U-Pb年龄和Hf同位素特征及其地质意义[J]. 地质通报, 2017, 36(8): 1393-1406.
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KOU Caihua, LIU Yanxue, LI Tingdong, HUANG He, ZHANG Heng. LA-ICP-MS U-Pb dating and Hf isotopes of detrital zircon grains from siltstone of Danzhou Group in northern Guangxi and their geological significance[J]. Geological Bulletin of China, 2017, 36(8): 1393-1406.
Citation: KOU Caihua, LIU Yanxue, LI Tingdong, HUANG He, ZHANG Heng. LA-ICP-MS U-Pb dating and Hf isotopes of detrital zircon grains from siltstone of Danzhou Group in northern Guangxi and their geological significance[J]. Geological Bulletin of China, 2017, 36(8): 1393-1406.
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桂北地区丹洲群碎屑锆石LA-ICP-MS U-Pb年龄和Hf同位素特征及其地质意义

  • 中国地质科学院地质研究所, 北京 100037

  • 基金项目:
    国家自然科学基金项目《江南造山带西段桂北新元古代基性-超基性岩岩石成因研究及其对构造演化的约束》（批准号：41402052）、中国地质科学院基本科研业务《湘西新元古代基性-超基性岩岩石年代学及成因研究》（编号：J1602）和中国地质调查项目《中国区域地质志》（编号：1212011120117）
详细信息
    作者简介: 寇彩化(1985-), 女, 博士, 助理研究员, 从事岩石地球化学研究。E-mail:caihuakou@163.com

  • 中图分类号: P597+.3;P534.3

LA-ICP-MS U-Pb dating and Hf isotopes of detrital zircon grains from siltstone of Danzhou Group in northern Guangxi and their geological significance

  • Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

    摘要

  • 桂北丹洲群顶部拱洞组粉砂岩的碎屑锆石的阴极发光图像和Th/U（0.2~2.4）值显示，它们均为岩浆成因的锆石。锆石206Pb/238Pb年龄分布在730~769Ma和771~850Ma之间，这些锆石的Hf同位素成分范围较大，εHf（t）值和二阶段Hf模式年龄（TDM2）分别为-18.4~11.4和1020~2812Ma。此外，样品中还有一些年龄较老的锆石颗粒，207Pb/206Pb年龄为1910~3140Ma，εHf（t）值和二阶段Hf模式年龄（TDM2）分别为-13.6~3.4和2740~3635Ma。结合前人的研究推测，桂北丹洲群拱洞组沉积年龄小于等于706±10Ma，物源主要由扬子板块新元古代岩浆岩组成，也有少量太古宙岩浆岩的加入。推测中国华南地区存在对应于Rodinia超大陆聚合相关的格林威尔运动的响应。根据已测锆石的εHf（t）值和Hf二阶段模式年龄推断，研究区地壳生长主要经历3个阶段：① 3.64~3.25Ga，初生地壳出现在3.64Ga；② 2.98~2.37Ga；③ 2.19~1.28Ga，地壳生长的主要时期。

    This paper reports LA-ICP-MS U-Pb dating and Hf isotopes for detrital zircon grains of siltstone from Gongdong For-mation at the top of the Danzhou Group. The majority of zircon grains are transparent, euhedral and prismatic crystals with oscillato-ry zoning in CL images and have high Th/U ratios of 0.2~2.4, indicating an igneous origin for the zircon. The 206Pb/238Pb age distri-butions for the detrital zircon grains mainly range from 730Ma to 769Ma and 771Ma to 850Ma, and εHf(t)and two-stage Hf model ages (TDM2) range from -18.4 to 11.4 and from 1020Ma to 2812Ma, respectively. Moreover, there are some detrital zircon grains with relatively older ages with 206Pb/238Pb ages from 1910Ma to 3140Ma, and εHf(t)and TDM2 from -13.6~3.4 and 2740~3635Ma, respec-tively. Combined with previous researches, the authors infer that the maximum depositional age of the Gongdong Formation from Danzhou Group is 706±10Ma. The source region was predominated by Neoproterozoic magmatic rocks from Yangtze Block (ca. 750~830Ma) with the mixture of minor Archean magmatic rocks. There was developed the Greenville movement in South China re-sulting from the assembly of Rodinia supercontinent. In addition, on the basis of the εHf(t)and TDM2 data of the detrital zircon grains, the authors hold the existence of three stages for the crust growth in the study area:① 3.64Ga to 3.25Ga, with the juvenile crust at 3.64Ga; ② 2.98Ga to 2.37Ga; ③ 2.19Ga to 1.28Ga.

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  • 图 1  研究区地质简图

    Figure 1. 

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    图 2  丹洲群拱洞组浅灰绿色粉砂岩

    Figure 2. 

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    图 3  丹洲群拱洞组碎屑锆石阴极发光（CL）图像

    Figure 3. 

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    图 4  丹洲群拱洞组碎屑锆石U-Pb谐和图（a）和年龄直方图（b）

    Figure 4. 

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    图 5  丹洲群拱洞组碎屑锆石εHf(t)和U-Pb年龄图

    Figure 5. 

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    图 6  丹洲群拱洞组碎屑锆石TDM2 -εHf(t)（a）和二阶段Hf模式年龄直方图（b）

    Figure 6. 

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    表 1  丹洲群拱洞组碎屑锆石U-Th-Pb同位素数据（样品号：HK-19）

    Table 1.  U-Th-Pb isotope data for detrital zircon grains fromGongdong Formation in Danzhou Group (Sample: HK-19)

    点号Th/U铅同位素比值及误差年龄及误差/Ma
    206Pb/238U±1σ207Pb/235U±1σ207Pb/206Pb±1σ208Pb/232Th±1σ 206Pb/238U±1σ207Pb/235U±1σ207Pb/206Pb±1σ208Pb/232Th±1σ
    1 1.5 0.1279 0.0014 1.3656 0.0171 0.0805 0.0009 0.0447 0.0004 776 8 874 7 1208 21 885 7
    2 1.4 0.1215 0.0019 1.0770 0.0597 0.0642 0.0026 0.0441 0.0008 739 11 742 29 749 82 872 15
    3 1 0.1226 0.0019 1.2502 0.0600 0.0785 0.0023 0.0464 0.0009 745 11 824 27 1159 58 917 17
    5 0.8 0.1160 0.0017 1.0137 0.0474 0.0688 0.0021 0.0458 0.0009 707 10 711 24 894 63 905 17
    6 0.9 0.1214 0.0014 1.2101 0.0227 0.0757 0.0010 0.0486 0.0005 739 8 805 10 1086 27 959 9
    7 1.1 0.1199 0.0016 1.0707 0.0369 0.0724 0.0017 0.0452 0.0006 730 9 739 18 996 46 893 12
    8 0.8 0.3517 0.0042 5.7701 0.1901 0.1300 0.0019 0.1087 0.0014 1943 20 1942 29 2098 25 2085 26
    10 0.3 0.1303 0.0015 1.3014 0.0227 0.0730 0.0009 0.0477 0.0006 790 8 846 10 1013 26 941 11
    11 0.5 0.3653 0.0041 8.2370 0.1776 0.1622 0.0018 0.1070 0.0012 2007 19 2257 20 2478 19 2055 21
    12 0.9 0.1286 0.0018 1.2802 0.0581 0.0721 0.0021 0.0420 0.0008 780 11 837 26 990 57 831 15
    13 1.5 0.1284 0.0015 1.3790 0.0298 0.0804 0.0012 0.0425 0.0004 779 8 880 13 1207 29 841 8
    14 1.2 0.1261 0.0014 1.5223 0.0273 0.0848 0.0011 0.0401 0.0004 765 8 939 11 1310 25 795 7
    17 0.9 0.1314 0.0016 1.1880 0.0361 0.0671 0.0014 0.0421 0.0006 796 9 795 17 840 42 833 11
    18 0.2 0.4065 0.0045 8.0073 0.1490 0.1416 0.0015 0.1349 0.0015 2199 21 2232 17 2247 19 2557 27
    19 0.6 0.3909 0.0044 7.0752 0.1552 0.1320 0.0015 0.1055 0.0011 2127 20 2121 20 2125 20 2028 20
    22 1.7 0.1248 0.0014 1.3757 0.0218 0.0808 0.0010 0.0374 0.0003 758 8 879 9 1217 23 743 6
    24 0.9 0.4518 0.0053 10.3996 0.3385 0.1600 0.0020 0.1301 0.0015 2403 24 2471 30 2456 21 2472 27
    25 0.9 0.1483 0.0019 1.4037 0.0532 0.0675 0.0015 0.0369 0.0006 892 11 891 22 854 46 732 12
    27 1 0.1286 0.0016 1.3455 0.0452 0.0716 0.0015 0.0404 0.0006 780 9 866 20 974 42 800 11
    28 1 0.1400 0.0016 1.4749 0.0230 0.0770 0.0009 0.0461 0.0004 845 9 920 9 1120 23 911 8
    30 1 0.1294 0.0015 1.3466 0.0236 0.0763 0.0010 0.0416 0.0004 785 8 866 10 1104 25 825 8
    31 0.5 0.2278 0.0026 3.8563 0.0745 0.1230 0.0014 0.0828 0.0009 1323 13 1605 16 2000 21 1609 16
    34 1.6 0.1804 0.0030 1.9028 0.1375 0.0741 0.0025 0.0465 0.0010 1069 16 1082 48 1044 67 919 20
    35 2.2 0.1327 0.0022 2.1332 0.1268 0.1069 0.0033 0.0427 0.0008 803 13 1160 41 1748 55 846 15
    36 1.1 0.1375 0.0016 1.4122 0.0271 0.0755 0.0010 0.0402 0.0004 831 9 894 11 1082 27 798 8
    37 1.5 0.1355 0.0015 1.4474 0.0257 0.0791 0.0010 0.0392 0.0004 819 9 909 11 1174 25 777 7
    38 0.8 0.4790 0.0053 10.8197 0.1935 0.1657 0.0018 0.1191 0.0011 2523 23 2508 17 2515 18 2275 20
    39 1.3 0.1339 0.0015 1.4799 0.0325 0.0773 0.0011 0.0414 0.0004 810 9 922 13 1128 29 819 8
    40 1.9 0.1403 0.0016 1.5250 0.0283 0.0771 0.0010 0.0384 0.0004 846 9 941 11 1125 26 762 7
    41 1.1 0.1242 0.0015 1.3032 0.0335 0.0761 0.0013 0.0381 0.0005 755 9 847 15 1097 33 755 9
    42 2 0.1247 0.0017 1.4777 0.0609 0.0840 0.0021 0.0467 0.0006 757 10 921 25 1291 48 922 12
    43 0.5 0.3277 0.0036 5.3420 0.0685 0.1236 0.0013 0.0841 0.0007 1827 17 1876 11 2008 18 1632 13
    45 1.9 0.1278 0.0014 1.3844 0.0211 0.0807 0.0009 0.0402 0.0004 775 8 882 9 1214 23 797 7
    46 1.7 0.1239 0.0014 1.4050 0.0228 0.0818 0.0010 0.0416 0.0004 753 8 891 10 1240 24 823 7
    47 0.4 0.3664 0.0040 7.9664 0.1168 0.1566 0.0016 0.1193 0.0011 2012 19 2227 13 2419 17 2278 20
    48 0.9 0.1278 0.0014 1.3298 0.0216 0.0736 0.0009 0.0441 0.0004 776 8 859 9 1031 24 873 8
    50 1 0.1410 0.0026 1.5663 0.1190 0.0720 0.0031 0.0399 0.0012 850 15 957 47 986 86 791 22
    52 0.8 0.1238 0.0024 1.0980 0.0891 0.0605 0.0032 0.0425 0.0013 753 14 752 43 621 32 842 26
    53 0.6 0.5089 0.0057 12.6676 0.2778 0.1802 0.0020 0.1365 0.0014 2652 24 2655 21 2655 18 2587 24
    55 0.2 0.1326 0.0015 1.2181 0.0234 0.0685 0.0009 0.0466 0.0007 803 9 809 11 884 28 920 13
    56 0.6 0.3177 0.0035 6.6179 0.1242 0.1485 0.0016 0.0970 0.0009 1779 17 2062 17 2329 19 1871 17
    57 0.8 0.1281 0.0014 1.2817 0.0236 0.0740 0.0010 0.0434 0.0004 777 8 838 10 1040 26 859 8
    58 0.7 0.1290 0.0017 1.1541 0.0422 0.0669 0.0016 0.0426 0.0007 782 10 779 20 835 49 842 14
    60 1.4 0.1278 0.0021 1.2811 0.0729 0.0737 0.0025 0.0484 0.0009 775 12 837 32 1034 68 955 16
    61 1.2 0.1355 0.0020 1.2282 0.0567 0.0697 0.0020 0.0402 0.0007 819 11 814 26 918 59 797 14
    62 1 0.1282 0.0015 1.2805 0.0254 0.0725 0.0010 0.0399 0.0004 778 8 837 11 1000 28 791 8
    63 1.4 0.3886 0.0049 6.9856 0.3021 0.1323 0.0021 0.1000 0.0013 2117 23 2110 38 2129 28 1926 23
    65 1.4 0.1278 0.0014 1.3714 0.0206 0.0797 0.0009 0.0423 0.0004 776 8 877 9 1191 23 837 7
    66 0.9 0.1281 0.0015 1.3583 0.0273 0.0769 0.0011 0.0436 0.0004 777 8 871 12 1117 28 862 9
    67 1.3 0.3407 0.0042 6.3821 0.2477 0.1361 0.0021 0.1135 0.0013 1890 20 2030 34 2179 27 2172 24
    68 2 0.1265 0.0014 1.4306 0.0274 0.0814 0.0011 0.0399 0.0004 768 8 902 11 1231 26 791 7
    69 1.6 0.1271 0.0015 1.4205 0.0366 0.0802 0.0013 0.0389 0.0004 771 9 898 15 1201 33 772 8
    70 1.3 0.1277 0.0015 1.3916 0.0270 0.0788 0.0011 0.0443 0.0004 775 8 885 11 1168 27 877 8
    72 1.5 0.1279 0.0020 1.3012 0.0687 0.0726 0.0024 0.0411 0.0008 776 11 846 30 1004 65 814 15
    75 1.8 0.1247 0.0016 1.3630 0.0421 0.0809 0.0016 0.0423 0.0005 758 9 873 18 1218 38 838 9
    76 0.6 0.5460 0.0060 18.7385 0.3436 0.2430 0.0025 0.1551 0.0014 2809 25 3029 18 3140 16 2914 25
    77 1.1 0.1250 0.0015 1.3401 0.0323 0.0756 0.0012 0.0398 0.0004 759 8 863 14 1084 32 789 9
    79 0.7 0.2967 0.0033 6.2970 0.1025 0.1512 0.0016 0.0851 0.0008 1675 16 2018 14 2359 18 1651 14
    80 1 0.2948 0.0038 4.2902 0.1695 0.1207 0.0021 0.1044 0.0014 1666 19 1692 33 1966 31 2007 26
    81 0.5 0.4567 0.0051 10.1246 0.2459 0.1589 0.0018 0.1121 0.0013 2425 23 2446 22 2444 19 2147 24
    82 1.1 0.3620 0.0041 6.4596 0.1485 0.1343 0.0016 0.1019 0.0010 1992 19 2040 20 2155 20 1962 18
    83 0.8 0.3374 0.0042 5.4538 0.1983 0.1255 0.0019 0.0854 0.0013 1874 20 1893 31 2036 27 1656 24
    85 0.8 0.4594 0.0051 10.6858 0.2360 0.1717 0.0019 0.1289 0.0013 2437 23 2496 21 2574 18 2451 22
    86 1.2 0.1323 0.0017 1.2307 0.0426 0.0713 0.0016 0.0422 0.0006 801 10 815 19 965 44 836 12
    87 1.1 0.3678 0.0041 8.3767 0.1806 0.1640 0.0019 0.0807 0.0008 2019 19 2273 20 2498 19 1569 15
    88 1.7 0.1341 0.0015 1.4328 0.0233 0.0778 0.0009 0.0411 0.0004 811 8 903 10 1141 24 814 7
    89 0.2 0.4116 0.0045 7.9881 0.1218 0.1412 0.0015 0.1074 0.0011 2222 20 2230 14 2242 18 2061 20
    90 1.4 0.1263 0.0015 1.2999 0.0297 0.0750 0.0012 0.0339 0.0004 767 8 846 13 1067 31 674 7
    92 1 0.1235 0.0015 1.1300 0.0370 0.0665 0.0022 0.0351 0.0007 751 8 768 18 833 73 697 13
    93 1.6 0.1173 0.0017 1.0583 0.0381 0.0652 0.0023 0.0330 0.0006 715 10 733 19 789 73 657 12
    94 1.4 0.1210 0.0012 1.1084 0.0257 0.0663 0.0015 0.0295 0.0005 736 7 757 12 815 48 587 10
    95 1.6 0.1354 0.0017 1.2053 0.0383 0.0648 0.0022 0.0373 0.0007 818 10 803 18 769 69 740 15
    96 0.6 0.3508 0.0043 5.9422 0.1281 0.1225 0.0025 0.0942 0.0020 1938 20 1967 19 1992 37 1820 37
    97 1.4 0.1316 0.0018 1.1608 0.0345 0.0639 0.0019 0.0372 0.0008 797 10 782 16 739 24 739 16
    98 0.7 0.1392 0.0019 1.2991 0.0447 0.0677 0.0023 0.0398 0.0011 840 11 845 20 859 70 789 21
    99 2.3 0.1276 0.0016 1.1130 0.0238 0.0632 0.0013 0.0339 0.0007 774 9 760 12 722 42 674 13
    100 2 0.1290 0.0019 1.1084 0.0328 0.0630 0.0020 0.0312 0.0007 782 11 757 16 706 69 622 13
    101 2.4 0.1294 0.0016 1.1673 0.0295 0.0657 0.0017 0.0328 0.0008 785 9 785 14 798 54 652 16
    102 1.4 0.1391 0.0020 1.2490 0.0371 0.0659 0.0021 0.0341 0.0011 839 12 823 17 1200 67 678 21
    104 1.4 0.1224 0.0019 1.0384 0.0436 0.0624 0.0028 0.0285 0.0011 744 11 723 22 700 99 568 21
    105 1.6 0.1268 0.0018 1.0735 0.0356 0.0623 0.0021 0.0310 0.0010 769 11 740 17 683 73 618 19
    106 0.3 0.5570 0.0065 16.1080 0.3605 0.2098 0.0041 0.1234 0.0034 2854 27 2883 22 2906 32 2353 62
    107 1.5 0.1321 0.0022 1.1502 0.0506 0.0633 0.0027 0.0343 0.0009 800 13 777 24 717 86 681 17
    108 1.3 0.1301 0.0015 1.0967 0.0300 0.0610 0.0015 0.0335 0.0007 788 8 752 15 639 58 665 15
    109 1.2 0.1211 0.0015 1.0231 0.0287 0.0614 0.0017 0.0317 0.0007 737 9 715 14 654 64 632 14
    110 1 0.1237 0.0021 1.0895 0.0394 0.0639 0.0022 0.0334 0.0008 752 12 748 19 739 73 663 15
    111 1 0.3236 0.0048 5.2312 0.1328 0.1169 0.0027 0.0874 0.0020 1807 24 1858 22 1910 9 1694 38
    112 0.7 0.1145 0.0014 0.9719 0.0193 0.0612 0.0010 0.0313 0.0006 699 8 689 10 656 37 622 11
    113 1.2 0.3597 0.0057 6.0394 0.1412 0.1221 0.0029 0.0965 0.0022 1981 27 1982 20 1987 43 1863 40
    114 1.1 0.3414 0.0036 5.6829 0.1087 0.1202 0.0024 0.1051 0.0021 1894 18 1929 17 1959 35 2019 39
    115 2.2 0.1244 0.0013 1.1103 0.0220 0.0645 0.0012 0.0363 0.0006 756 8 758 11 767 41 720 12
    116 1.7 0.1306 0.0013 1.1795 0.0234 0.0654 0.0013 0.0380 0.0007 791 7 791 11 789 43 753 14
    117 2.2 0.1224 0.0012 1.0672 0.0214 0.0632 0.0012 0.0322 0.0006 744 7 737 11 722 41 641 11
    118 1.3 0.1274 0.0016 1.1309 0.0269 0.0644 0.0014 0.0345 0.0007 773 9 768 13 754 46 686 15
     注：锆石U-Pb年龄值使用说明（包括正文、图及锆石Hf同位素计算）：小于12亿年的数据均用锆石的206Pb/238Pb年龄，大于12亿年的数据均用锆石的207Pb/206Pb年龄
    下载: 导出CSV

    表 2  丹洲群拱洞组碎屑锆石Hf同位素数据（样品号：HK-19）

    Table 2.  Hf isotope data for detrital zircon grains for from Gongdong Formation in Danzhou Group (Sample: HK-19)

    点号年龄/Ma176Yb/177Hf176Lu/177Hf176Hf/177Hf2σεHf(0)εHf(t)2σTDMTDM2fLu/Hf
    1 776 0.219353 0.006281 0.282138 0.000030 -22.4 -8.6 1.1 1825 1020 -0.81
    5 707 0.072002 0.001906 0.281938 0.000022 -29.5 -14.8 0.8 1894 1276 -0.94
    6 739 0.058196 0.002005 0.282453 0.000029 -11.3 4.0 1.0 1162 1284 -0.94
    7 730 0.114721 0.002999 0.282442 0.000023 -11.7 3.0 0.8 1210 1318 -0.91
    9 737 0.052978 0.001515 0.282479 0.000022 -10.4 5.2 0.8 1109 1331 -0.95
    11 2478 0.026945 0.000711 0.281292 0.000020 -52.3 2.0 0.7 2716 2878 -0.98
    12 780 0.084112 0.002497 0.282416 0.000026 -12.6 3.3 0.9 1231 1357 -0.92
    14 765 0.071027 0.002187 0.282358 0.000028 -14.6 1.1 1.0 1305 1376 -0.93
    18 2247 0.010113 0.000281 0.281005 0.000021 -62.5 -12.7 0.8 3068 3635 -0.99
    24 2456 0.012930 0.000350 0.280947 0.000027 -64.5 -10.1 1.0 3150 3633 -0.99
    25 892 0.059806 0.001608 0.282423 0.000020 -12.4 6.4 0.7 1192 1404 -0.95
    27 780 0.066628 0.002078 0.282221 0.000029 -19.5 -3.3 1.0 1497 1419 -0.94
    28 845 0.111336 0.003463 0.282502 0.000029 -9.5 7.2 1.0 1135 1455 -0.90
    31 2000 0.095880 0.002104 0.281371 0.000029 -49.6 -7.8 1.0 2707 3133 -0.94
    36 831 0.070647 0.001974 0.282486 0.000029 -10.1 7.1 1.0 1113 1464 -0.94
    37 819 0.079851 0.002488 0.282402 0.000030 -13.1 3.6 1.1 1251 1480 -0.93
    38 2515 0.024262 0.000678 0.281306 0.000027 -51.8 3.4 0.9 2694 2818 -0.98
    39 810 0.054110 0.001748 0.281968 0.000030 -28.4 -11.5 1.1 1844 1485 -0.95
    41 755 0.047925 0.001671 0.282422 0.000029 -12.4 3.4 1.0 1196 1491 -0.95
    43 2008 0.034244 0.000899 0.281269 0.000022 -53.2 -9.6 0.8 2760 3254 -0.97
    45 775 0.087182 0.002445 0.282459 0.000027 -11.1 4.8 1.0 1166 1496 -0.93
    48 776 0.060838 0.001670 0.282451 0.000024 -11.3 4.9 0.8 1154 1505 -0.95
    50 850 0.055959 0.001554 0.282587 0.000027 -6.6 11.4 0.9 957 1542 -0.95
    52 753 0.044033 0.001189 0.282224 0.000025 -19.4 -3.4 0.9 1458 1556 -0.96
    53 2655 0.032016 0.000840 0.281053 0.000027 -60.8 -2.7 0.9 3048 3316 -0.97
    55 803 0.096307 0.002506 0.282404 0.000029 -13.0 3.4 1.0 1249 1621 -0.92
    56 2329 0.060331 0.001826 0.281380 0.000029 -49.2 0.0 1.0 2674 2892 -0.95
    57 777 0.052260 0.001568 0.282393 0.000028 -13.4 2.9 1.0 1234 1643 -0.95
    60 775 0.082866 0.002401 0.282354 0.000025 -14.8 1.1 0.9 1319 1674 -0.93
    61 819 0.065627 0.001713 0.281999 0.000024 -27.4 -10.2 0.8 1798 1678 -0.95
    62 778 0.060447 0.001703 0.282432 0.000025 -12.0 4.3 0.9 1181 1745 -0.95
    63 2129 0.019084 0.000527 0.281344 0.000028 -50.5 -3.7 1.0 2633 2975 -0.98
    65 776 0.181892 0.005012 0.282140 0.000030 -22.4 -7.8 1.1 1754 1800 -0.85
    66 777 0.055295 0.001738 0.282379 0.000027 -13.9 2.3 1.0 1260 1800 -0.95
    67 2179 0.026747 0.000692 0.281207 0.000030 -55.3 -7.7 1.1 2829 3265 -0.98
    68 768 0.193127 0.004771 0.282366 0.000027 -14.4 0.1 0.9 1391 1808 -0.86
    70 775 0.055633 0.001524 0.281995 0.000023 -27.5 -11.2 0.8 1794 1809 -0.95
    79 2359 0.095668 0.002043 0.281448 0.000030 -46.8 2.7 1.0 2594 2740 -0.94
    80 1966 0.018405 0.000473 0.281409 0.000022 -48.2 -5.0 0.8 2541 2929 -0.99
    81 2444 0.027353 0.000719 0.281183 0.000023 -56.2 -2.6 0.8 2863 3148 -0.98
    82 2155 0.014151 0.000423 0.281287 0.000024 -52.5 -5.0 0.8 2702 3076 -0.99
    83 2036 0.038675 0.000924 0.281141 0.000022 -57.7 -13.6 0.8 2936 3525 -0.97
    85 2574 0.051989 0.001255 0.281031 0.000030 -61.6 -6.1 1.1 3111 3466 -0.96
    87 2498 0.026692 0.000816 0.281296 0.000022 -52.2 2.4 0.8 2718 2867 -0.98
    88 811 0.161497 0.004032 0.281970 0.000030 -28.4 -12.7 1.1 1961 1886 -0.88
    89 2242 0.015048 0.000415 0.281320 0.000022 -51.4 -1.9 0.8 2658 2944 -0.99
    93 715 0.067517 0.001980 0.282279 0.000024 -17.4 -2.6 0.8 1410 1905 -0.94
    94 736 0.057541 0.001597 0.282381 0.000025 -13.8 1.6 0.9 1252 2021 -0.95
    95 818 0.030886 0.001072 0.282313 0.000029 -16.2 1.2 1.0 1329 2107 -0.97
    96 1992 0.018463 0.000468 0.281237 0.000021 -54.3 -10.5 0.7 2773 3300 -0.99
    97 779 0.081626 0.002245 0.282296 0.000029 -16.8 -0.8 1.0 1397 1371 -0.93
    97 797 0.081366 0.002633 0.282469 0.000029 -10.7 5.5 1.0 1158 2186 -0.92
    98 840 0.052788 0.001501 0.281752 0.000027 -36.1 -18.4 1.0 2134 2232 -0.95
    99 774 0.218394 0.005379 0.281978 0.000029 -28.1 -13.8 1.0 2027 2306 -0.84
    100 782 0.100439 0.002769 0.282180 0.000029 -21.0 -5.2 1.0 1587 2370 -0.92
    104 744 0.055933 0.001592 0.282270 0.000030 -17.7 -2.1 1.1 1409 2395 -0.95
    108 788 0.064820 0.001832 0.282317 0.000026 -16.1 0.3 0.9 1351 2404 -0.94
    109 737 0.038962 0.001193 0.282480 0.000024 -10.3 5.3 0.9 1098 2444 -0.96
    110 752 0.086209 0.002935 0.282427 0.000029 -12.2 2.9 1.1 1230 2517 -0.91
    111 1910 0.060079 0.001492 0.281307 0.000030 -51.8 -11.2 1.0 2750 3277 -0.96
    116 791 0.208042 0.006198 0.282101 0.000023 -23.7 -9.6 1.1 1880 2559 -0.81
    117 744 0.161311 0.004125 0.282035 0.000029 -26.1 -11.7 1.0 1868 2572 -0.88
    118 773 0.106784 0.002604 0.282274 0.000027 -17.6 -1.9 1.1 1443 2812 -0.92
     注：锆石的εHf(t)值用各自的206Pb/238Pb（介于707~892Ma之间的锆石）或207Pb/206Pb（介于1910~2655Ma之间的锆石）年龄计算
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    ①

    广西壮族自治区地质矿产局. 1: 20万三江幅和溆浦幅. 1985.

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