LA-ICP-MS zircon U-Pb age, geochemistry and genesis of Neoproterozoic granitoids in the Biezhentao Mountain of Wenquan County, Xinjiang
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摘要:
对新疆温泉县别珍套山新元古代花岗岩开展了相关研究。获得了3个片麻状-眼球状花岗岩4件锆石样品年龄，其中206Pb/238U年龄值一致，大多集中在910~950 Ma之间。极少量继承锆石的年龄大于1000 Ma。这些花岗岩以特有的粗粒、巨大的眼球状片麻结构为特征。岩体具有高硅（≥ 70%）、富碱（K2O+Na2O，6.5%~8.9%）且K2O>Na2O的特征，表现出从钙碱性到钾玄岩演化的变化趋势。稀土元素特征表明其与碱性花岗岩相似。样品的微量元素蛛网图几乎完全相同，均明显亏损Ba、Nb、Ta、Sr、P、Ti，富集Rb、Th、U、K等元素，显示活动大陆边缘岩石特征。全岩Sr-Nd同位素特征表明具典型壳源花岗岩（S型花岗岩）的特征。Lu-Hf同位素特征表明单阶段Hf模式年龄（tDM1）为883~1351 Ma，平均为1133 Ma；二阶段Hf模式年龄（tDM2）为891~1588 Ma，平均为1250 Ma，与锆石形成年龄较接近。新元古代早期（约9 Ga）片麻状花岗岩可能是与Rodinia超大陆会聚有关的格林维尔期造山作用、地壳增厚导致地壳物质部分熔融的产物。
Abstract:The Neoproterozoic granites of the Biezhentao Mountain in Wenquan County of Xinjang were studied in this paper.Four LA-ICP-MS zircon U-Pb ages of 910~950 Ma were obtained for granitic gneisses in the Biezhentao Mountain of Wenquan County of Xinjiang.These new zircon LA-ICP MS U-Pb ages, together with previously published data, indicate that the granites were emplaced during 910~950 Ma.A few inherited old zircons U-Pb ages of >1000 Ma were found in all dated samples; they may have derived from the source rocks. These granitoids are characterized by a very coarse grained and huge augen gneiss texture. Major element data indicate that they belong to peraluminous monzogranite, with SiO2 (≥ 70%), K2O+Na2O (6.5%~8.9%), and K2O > Na2O, thus defined as calc-alkaline to shoshonitic rocks. These rocks show nearly parallel REE patterns with different abundances and distinct negative Eu anomalies. All the granitoids display similar spider diagrams with obvious negative anomalies of Ba, Nb, Ta, Sr, P and Ti, and obvious enrichment of Rb, Th, U, K. Sr-Nd data suggest that the protoliths of Neoproterozoic granitoids belong to peraluminous S-type granites. Zircon εHf (t) values range from +1.7 to +5.7, with model ages (tDM1) of 883~1351 Ma and model ages (tDM2) of 891~1588 Ma. Furthermore, with the age information on the ancient terranes of Tarim basin, the authors hold that the Tianshan ancient block probably formed a part of Rodina supercontinent during Early Neoproterozoic period and these granitoid rocks were linked to lithospheric thickening.
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Key words:
- granite /
- zircon U-Pb age /
- geochemistry /
- Neoproterozoic /
- Wenquan County
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表 1 新元古代片麻状花岗岩锆石U-Th-Pb年龄测试结果
Table 1. Zircon U-Th-Pb dating results of Neoproterozoic granitoids
测点 Pb
(总量)232Th 238U Th/U 同位素比值 同位素年龄/Ma 谐和
度/%/10-6 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ PM16-2-TW1 1 122 78 688 0.11 0.0681 0.0017 1.524 0.039 0.1624 0.0024 870 50 940 16 970 13 96.9 2 172 253 948 0.27 0.0666 0.0014 1.504 0.034 0.1638 0.0023 826 44 932 14 978 13 95.3 3 178 159 1066 0.15 0.0674 0.0014 1.419 0.031 0.1527 0.0022 849 42 897 13 916 12 97.9 4 216 1387 1026 1.35 0.0669 0.0014 1.356 0.030 0.1471 0.0021 834 43 870 13 885 12 98.3 5 127 157 662 0.24 0.0726 0.0017 1.670 0.040 0.1668 0.0024 1003 46 997 15 995 13 100.2 6 507 619 3233 0.19 0.0691 0.0010 1.375 0.023 0.1444 0.0020 901 29 879 10 870 11 101.0 7 473 810 2945 0.28 0.0693 0.0010 1.409 0.024 0.1475 0.0020 908 30 893 10 887 11 100.7 8 233 180 1389 0.13 0.0671 0.0013 1.419 0.029 0.1535 0.0022 839 39 897 12 921 12 97.4 9 160 100 948 0.11 0.0662 0.0015 1.417 0.033 0.1553 0.0022 812 46 896 14 931 12 96.2 10 173 184 1040 0.18 0.0685 0.0015 1.437 0.032 0.1521 0.0022 884 43 904 13 913 12 99.0 12 204 617 1316 0.47 0.0716 0.0014 1.392 0.030 0.1411 0.0020 973 40 885 13 851 11 104.0 13 187 135 1109 0.12 0.0664 0.0014 1.425 0.032 0.1556 0.0022 820 44 899 13 932 12 96.5 14 139 193 749 0.26 0.0669 0.0016 1.526 0.038 0.1655 0.0024 834 49 941 15 987 13 95.3 15 62 120 351 0.34 0.0675 0.0024 1.432 0.051 0.1540 0.0025 853 72 903 21 923 14 97.8 16 182 135 1124 0.12 0.0673 0.0014 1.391 0.031 0.1500 0.0022 846 42 885 13 901 12 98.2 17 136 114 795 0.14 0.0679 0.0015 1.459 0.035 0.1560 0.0023 865 46 914 14 934 13 97.9 18 327 192 1985 0.10 0.0673 0.0011 1.420 0.026 0.1532 0.0021 846 34 897 11 919 12 97.6 19 234 1135 1436 0.79 0.0691 0.0013 1.427 0.028 0.1498 0.0021 902 37 900 12 900 12 100.0 20 149 109 872 0.13 0.0675 0.0014 1.480 0.033 0.1592 0.0023 852 43 922 13 952 13 96.8 PM18-61-TW1 1 222 346 1337 0.26 0.0679 0.0014 1.407 0.032 0.1504 0.0023 866 42 892 13 903 13 98.8 2 206 474 1171 0.40 0.0725 0.0017 1.499 0.038 0.1502 0.0024 999 47 930 15 902 13 103.1 3 320 344 1889 0.18 0.0696 0.0014 1.498 0.033 0.1561 0.0024 918 41 929 14 935 13 99.4 4 293 338 1694 0.20 0.0699 0.0015 1.521 0.036 0.1580 0.0024 925 44 939 14 945 14 99.4 5 276 369 1471 0.25 0.0721 0.0018 1.652 0.043 0.1664 0.0026 987 49 990 17 992 15 99.8 6 598 1050 3253 0.32 0.0717 0.0013 1.588 0.033 0.1609 0.0025 977 38 966 13 962 14 100.4 7 237 907 1313 0.69 0.0744 0.0023 1.593 0.050 0.1556 0.0026 1051 60 968 20 932 14 103.9 8 244 240 1408 0.17 0.0703 0.0018 1.546 0.042 0.1596 0.0025 937 52 949 17 955 14 99.4 9 836 2128 4386 0.49 0.0845 0.0016 1.770 0.037 0.1520 0.0023 1305 35 1035 13 912 13 113.5 10 396 511 2118 0.24 0.0737 0.0019 1.677 0.046 0.1651 0.0026 1034 51 1000 17 985 15 101.5 11 392 691 2348 0.29 0.0713 0.0015 1.467 0.035 0.1494 0.0023 966 43 917 14 898 13 102.1 12 195 344 1040 0.33 0.0769 0.0022 1.724 0.051 0.1628 0.0027 1118 56 1018 19 972 15 104.7 13 221 442 1231 0.36 0.0707 0.0019 1.518 0.042 0.1558 0.0025 949 53 938 17 934 14 100.4 14 296 413 1619 0.26 0.0696 0.0015 1.570 0.037 0.1637 0.0025 917 44 958 15 977 14 98.1 15 195 212 1065 0.20 0.0716 0.0019 1.656 0.046 0.1678 0.0027 975 53 992 18 1000 15 99.2 16 284 522 1594 0.33 0.0728 0.0016 1.573 0.038 0.1568 0.0024 1010 44 960 15 939 14 102.2 17 191 331 1064 0.31 0.0683 0.0019 1.481 0.043 0.1573 0.0027 877 55 923 18 942 15 98.0 18 416 544 2399 0.23 0.0701 0.0014 1.506 0.034 0.1557 0.0026 931 40 933 14 933 14 100.0 19 194 376 1091 0.34 0.0689 0.0020 1.474 0.045 0.1551 0.0027 896 59 920 19 930 15 98.9 20 296 460 1656 0.28 0.0688 0.0017 1.496 0.040 0.1576 0.0027 893 51 929 16 944 15 98.4 21 314 503 1621 0.31 0.0770 0.0020 1.781 0.050 0.1677 0.0029 1121 52 1039 18 999 16 104.0 22 244 368 1329 0.28 0.0694 0.0019 1.562 0.046 0.1632 0.0028 911 56 955 18 974 16 98.0 23 231 367 1217 0.30 0.0689 0.0019 1.587 0.047 0.1671 0.0029 895 57 965 19 996 16 96.9 24 269 485 1434 0.34 0.0684 0.0018 1.545 0.044 0.1637 0.0028 882 55 949 18 977 16 97.1 25 194 209 1063 0.20 0.0694 0.0021 1.585 0.049 0.1656 0.0029 910 60 964 19 988 16 97.6 PM11-30-TW1 1 209 380 1179 0.32 0.0714 0.0015 1.433 0.032 0.1455 0.0021 969 42 903 13 876 12 103.1 2 186 290 1081 0.27 0.0689 0.0015 1.352 0.031 0.1424 0.0020 896 45 869 13 858 11 101.3 4 57 97 302 0.32 0.0684 0.0028 1.451 0.059 0.1540 0.0026 879 82 910 24 923 14 98.6 5 120 258 609 0.42 0.0685 0.0020 1.476 0.045 0.1563 0.0024 884 60 921 18 936 13 98.4 6 89 195 471 0.41 0.0702 0.0025 1.430 0.050 0.1478 0.0023 933 70 902 21 889 13 101.5 8 62 143 321 0.44 0.0827 0.0034 1.662 0.067 0.1458 0.0025 1262 78 994 26 877 14 113.3 9 135 267 693 0.39 0.0690 0.0019 1.506 0.043 0.1582 0.0024 900 57 933 18 947 13 98.5 10 53 123 266 0.46 0.0749 0.0032 1.591 0.068 0.1541 0.0027 1066 84 967 26 924 15 104.7 11 35 120 181 0.67 0.0664 0.0039 1.345 0.077 0.1470 0.0028 818 117 865 34 884 16 97.9 12 52 139 274 0.51 0.0712 0.0031 1.454 0.063 0.1481 0.0026 963 86 911 26 890 14 102.4 13 97 187 500 0.37 0.0701 0.0022 1.506 0.047 0.1559 0.0024 931 62 933 19 934 13 99.9 14 38 114 191 0.60 0.0693 0.0035 1.447 0.073 0.1516 0.0028 907 101 909 30 910 15 99.9 15 108 223 551 0.40 0.0679 0.0020 1.457 0.043 0.1557 0.0023 866 59 913 18 933 13 97.9 16 66 169 354 0.48 0.0704 0.0025 1.392 0.050 0.1435 0.0023 939 71 885 21 864 13 102.4 17 56 111 281 0.39 0.0699 0.0026 1.536 0.057 0.1595 0.0026 924 75 945 23 954 14 99.1 18 81 202 414 0.49 0.0700 0.0022 1.455 0.046 0.1507 0.0023 929 63 912 19 905 13 100.8 19 66 161 340 0.47 0.0673 0.0024 1.412 0.050 0.1522 0.0024 848 71 894 21 913 13 97.9 21 41 113 211 0.54 0.0718 0.0032 1.455 0.063 0.1471 0.0025 979 87 912 26 885 14 103.1 22 80 190 399 0.48 0.0691 0.0023 1.479 0.050 0.1554 0.0024 901 67 922 20 931 13 99.0 PM16-11-TW3 1 72 186 395 0.47 0.063 0.0033 1.337 0.070 0.1541 0.0029 708 108 862 31 924 16 93.3 2 154 534 807 0.66 0.0715 0.0022 1.535 0.048 0.1558 0.0026 970 61 944 19 934 14 101.1 3 110 273 605 0.45 0.0713 0.0026 1.537 0.056 0.1565 0.0027 965 72 945 23 937 15 100.9 4 96 185 516 0.36 0.0695 0.0027 1.549 0.061 0.1616 0.0029 914 78 950 24 966 16 98.3 5 123 258 712 0.36 0.0706 0.0025 1.464 0.053 0.1504 0.0026 947 71 916 22 903 15 101.4 6 69 166 375 0.44 0.0723 0.0038 1.555 0.082 0.156 0.0032 995 104 952 32 934 18 101.9 7 35 73 175 0.42 0.0747 0.0057 1.687 0.126 0.1639 0.004 1060 146 1004 48 978 22 102.7 8 40 123 218 0.57 0.0698 0.005 1.472 0.104 0.1531 0.0035 922 140 919 43 918 20 100.1 9 56 154 319 0.48 0.0684 0.0042 1.363 0.083 0.1447 0.0031 880 123 873 36 871 17 100.2 10 78 207 418 0.49 0.0696 0.0033 1.506 0.070 0.157 0.003 917 93 933 29 940 17 99.3 11 97 163 543 0.3 0.0712 0.0028 1.524 0.060 0.1553 0.0028 963 78 940 24 931 15 101.0 12 47 134 272 0.49 0.0686 0.0033 1.382 0.066 0.1462 0.0028 885 96 881 28 880 16 100.1 13 207 544 1216 0.45 0.0689 0.0016 1.382 0.035 0.1454 0.0023 897 47 881 15 875 13 100.7 15 88 229 493 0.46 0.072 0.0025 1.496 0.053 0.1507 0.0026 985 70 929 22 905 15 102.7 16 59 154 332 0.46 0.0645 0.0033 1.335 0.067 0.1501 0.0028 758 103 861 29 902 16 95.5 17 61 102 379 0.27 0.0687 0.003 1.380 0.061 0.1456 0.0027 890 88 880 26 876 15 100.5 18 119 212 717 0.29 0.0694 0.0022 1.397 0.046 0.1461 0.0025 909 65 888 19 879 14 101.0 19 45 118 250 0.47 0.0711 0.0037 1.508 0.077 0.1538 0.0031 960 102 934 31 922 17 101.3 20 61 151 336 0.45 0.0703 0.0031 1.480 0.065 0.1527 0.0028 937 88 922 27 916 16 100.7 注：谐和度=100×(207Pb/235U年龄)/(206Pb/238U年龄) 
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表 2 新元古代早期片麻状-眼球状花岗岩主量元素分析结果
Table 2. Abundances of major elements of Neoproterozoic granitoids
% 样号 岩性 SiO2 Al2O3 Fe2O3 FeO CaO MgO K2O Na2O TiO2 P2O5 MnO 烧失量 H2O+ CO2 总量 Na2O+K2O A/CNK A/NK PM11-30-HQ1 片麻状-眼球
状花岗岩66.18 13.26 2.11 5.35 2.77 0.51 5.31 2 0.79 0.19 0.12 1.21 0.54 0.096 100.44 7.31 0.94 1.47 PM11-30-HQ2 69.04 12.96 2.03 3.75 1.98 0.44 5.43 2.19 0.61 0.14 0.1 1.17 0.68 0.032 100.55 7.62 0.99 1.37 PM11-30-HQ3 69.53 13.27 1.28 3.52 1.47 0.45 5.94 2.26 0.55 0.13 0.09 1.32 0.56 0.033 100.4 8.2 1.03 1.31 PM11-30-HQ4 69.96 12.85 1.7 3.42 1.64 0.55 5.58 2.31 0.6 0.13 0.08 0.99 0.58 0.082 100.47 7.89 1.00 1.31 PM11-42-HQ1 67.87 13.99 1.25 4.5 2.28 0.86 4.23 2.94 0.73 0.23 0.09 0.84 0.24 0.012 100.06 7.17 1.03 1.49 PM11-42-HQ2 69.16 13.88 1.45 3.48 2.04 0.62 4.58 2.85 0.54 0.18 0.08 0.95 0.44 < 0.01 100.25 7.43 1.04 1.44 PM16-2-HQ1 73.69 12.45 1.06 1.74 1.64 0.62 5.06 2.21 0.39 0.11 0.04 0.8 0.32 0.13 100.26 7.27 1.03 1.37 PM16-2-HQ4 69.55 13.32 1.66 2.5 1.95 0.49 5.85 2.65 0.55 0.13 0.06 1.12 0.34 0.362 100.53 8.5 0.94 1.25 PM16-11-HQ1 糜棱岩化眼
球状花岗岩70.28 14.21 1.01 2.08 1.86 1.04 4.07 3.41 0.48 0.1 0.04 1.25 0.55 0.33 100.71 7.48 1.06 1.42 PM16-11-HQ3 70.15 14.7 0.99 2.65 2.19 0.71 2.75 4.02 0.45 0.12 0.06 0.98 0.4 0.094 100.26 6.77 1.08 1.53 PM16-18-HQ2 片麻状-眼球
状花岗岩66.13 13.5 2.01 4.8 2.69 0.59 5.47 2.08 0.79 0.19 0.12 1.43 0.48 0.407 100.69 7.55 0.95 1.44 PM16-101-HQ2 68.35 13.91 1.47 3.42 1.84 1.58 3.37 3.1 0.69 0.17 0.07 1.83 <0.01 0.276 100.08 6.47 1.15 1.59 PM16-101-HQ3 67.83 14.37 1.67 2.92 1.85 1.39 4.94 2.45 0.63 0.15 0.07 1.52 0.96 0.078 100.83 7.39 1.13 1.53 PM18-61-YQ1 糜棱岩化眼
球状花岗岩71.35 13.74 0.8 1.42 1.31 0.76 6.68 2.18 0.32 0.1 0.04 1.1 0.72 0.081 100.6 8.86 1.04 1.27 PM18-61-YQ2 67.5 14.36 1.83 2.48 2.42 1.34 4.33 2.78 0.59 0.14 0.06 1.97 1.32 0.033 101.15 7.11 1.05 1.55 PM18-61-YQ3 68.51 13.92 1.76 2.72 1.68 1.54 3.93 2.91 0.62 0.14 0.06 2 1.48 0.117 101.39 6.84 1.15 1.54
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表 3 新元古代早期片麻状-眼球状花岗岩稀土元素分析结果
Table 3. Abundances of rare earth elements of Neoproterozoic granitoids
10-6 样号 岩性 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ΣREE LREE HREE LREE/
HREELaN/
YbNδEu PM11-30-HQ1 片麻状-眼球
状花岗岩124 259 29.6 113 22.5 4.27 24.3 3.88 24.2 5 13.7 2.13 13.8 2.02 122 641.40 552.37 89.03 6.20 6.45 0.55 PM11-30-HQ2 152 319 34.9 128 24.8 3.31 25.4 4.01 25.3 5.38 15.2 2.28 14.5 2.16 136 756.24 662.01 94.23 7.03 7.52 0.40 PM11-30-HQ3 136 274 31 108 20.1 3.06 20.3 3.12 19.2 4 11.5 1.71 10.8 1.7 103 644.49 572.16 72.33 7.91 9.03 0.46 PM11-30-HQ4 160 321 35.2 127 23.5 3.09 24.3 4.01 23.8 4.99 14.1 2.06 12.7 1.95 123 757.70 669.79 87.91 7.62 9.04 0.39 PM11-42-HQ1 92.6 194 22 80.5 15.7 2.54 16.1 2.4 14.2 2.8 7.69 1.17 6.92 1.05 72.5 459.67 407.34 52.33 7.78 9.60 0.48 PM11-42-HQ2 86.4 171 18.9 65.2 12.7 2.53 13.3 2.1 12.8 2.63 7.17 1.11 6.91 1.06 65 403.81 356.73 47.08 7.58 8.97 0.59 PM16-2-HQ1 49.8 106 11.8 43.5 8.84 1.27 8.17 1.26 7.26 1.45 4.06 0.63 4.06 0.62 37.4 248.72 221.21 27.51 8.04 8.80 0.45 PM16-2-HQ4 112 206 24.2 89.2 16.2 1.81 16.5 2.66 15.9 3.3 9.36 1.45 9.31 1.38 82.8 509.27 449.41 59.86 7.51 8.63 0.34 PM16-11-HQ1 糜棱岩化眼
球状花岗岩73.2 136 15 51.2 8.89 1.07 8.12 1.25 7.28 1.48 4.28 0.63 4.28 0.62 42.2 313.30 285.36 27.94 10.21 12.27 0.38 PM16-11-HQ3 62.1 114 12.8 44.7 7.68 0.83 6.4 0.9 4.7 0.88 2.41 0.36 2.32 0.35 25.9 260.43 242.11 18.32 13.22 19.20 0.35 PM16-18-HQ2 片麻状-眼球
状花岗岩101 209 25.1 98 20 3.66 19.9 3.12 18 3.6 9.87 1.52 9.86 1.52 91.6 524.15 456.76 67.39 6.78 7.35 0.55 PM16-101-HQ2 69.1 131 15.5 55.7 9.95 1.33 9.22 1.27 7.16 1.4 4 0.62 3.96 0.61 39.9 310.82 282.58 28.24 10.01 12.52 0.42 PM16-101-HQ3 51.6 101 11.7 42.6 8.23 1.16 7.6 1.15 6.81 1.36 3.78 0.58 3.71 0.57 37 241.85 216.29 25.56 8.46 9.98 0.44 PM18-61-YQ1 糜棱岩化眼
球状花岗岩47 92.4 10.6 38.4 7.38 1.28 6.77 1.06 6.32 1.24 3.52 0.53 3.49 0.52 34.7 220.51 197.06 23.45 8.40 9.66 0.54 PM18-61-YQ2 57.8 112 12.5 45.3 8.52 1.42 7.77 1.23 7.17 1.45 4.02 0.61 3.92 0.6 39.6 264.31 237.54 26.77 8.87 10.58 0.52 PM18-61-YQ3 71.3 144 16.1 57.6 10.5 1.28 9.42 1.4 7.97 1.55 4.16 0.61 3.96 0.59 41.6 330.44 300.78 29.66 10.14 12.92 0.39
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表 4 新元古代早期片麻状-眼球状花岗岩微量元素分析结果
Table 4. Abundances of trace elements of Neoproterozoic granitoids
10-6 样号 岩性 Pb Cr Ni Co Rb Cs Sr Ba V Nb Ta Zr Hf Ge U Th PM11-30-HQ1 片麻状-眼球
状花岗岩37 3.81 3.42 3.56 162 2.72 153 1410 15 73.2 5.02 1110 27.7 1.75 3.73 28.5 PM11-30-HQ2 41.2 2.73 2.07 2.7 180 1.56 126 1080 10.8 62.4 4.38 816 21.5 1.79 4.36 43.8 PM11-30-HQ3 43.5 3.45 2.25 2.95 204 2.02 156 1200 12 53.8 3.78 771 20.3 1.5 3.72 38.2 PM11-30-HQ4 39.6 3.4 3.3 3.13 217 2.82 142 1010 13.3 58.5 4.18 854 22.9 1.54 4.55 47.7 PM11-42-HQ1 26.5 20.1 8.17 5.39 226 9.97 142 647 38.3 33.7 2.2 596 16.3 1.82 3.7 50.9 PM11-42-HQ2 29.3 7.02 4.43 3.07 235 7.95 133 661 26.4 27.5 1.88 491 13.9 1.81 5 50.5 PM16-2-HQ1 42 11.4 5.63 4.06 204 4.7 185 729 28.3 10.7 0.67 275 8.06 1.45 1.94 22.6 PM16-2-HQ4 37.7 4.39 2.76 3.71 228 3.24 90.3 680 18.7 43.4 2.91 610 16.3 1.84 3.4 33.4 PM16-11-HQ1 糜棱岩化眼
球状花岗岩53 16 6.66 6.33 190 3.38 288 890 34.2 14 1.36 239 6.64 1.22 4.12 31.2 PM16-11-HQ3 31.2 7.54 3.82 4.7 211 5.75 206 383 27.1 19.6 1.52 264 6.97 1.47 4.92 31.1 PM16-18-HQ2 片麻状-眼球
状花岗岩38.8 4.61 3.02 4.44 199 3.13 180 1370 19.4 65.1 4.25 1140 26.4 1.66 3.26 18 PM16-101-HQ2 25.8 22.3 8.98 9.04 202 9.01 185 534 57.2 15.8 1.3 278 8.12 1.52 3.09 32 PM16-101-HQ3 48.3 19.5 7.94 8.43 241 8.01 152 769 52.8 14.8 1.16 248 7.36 1.43 3.42 25.9 PM18-61-YQ1 糜棱岩化眼
球状花岗岩54.6 11.2 5.49 4.1 289 2.89 130 936 22.6 7.68 0.68 171 5.42 1.66 4.05 32.4 PM18-61-YQ2 41.8 24.1 8.48 8.52 211 2.77 113 836 51.4 13.5 1.1 246 7.12 1.64 3.74 29.7 PM18-61-YQ3 36.9 22.4 8.6 9.42 209 3.31 126 732 51 14.5 1.2 251 7.36 1.42 3.96 37.8
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表 5 新元古代片麻状花岗岩Sr-Nd同位素测试结果
Table 5. Abundances of Sr-Nd of Neoproterozoic granitoids
样号 PM11-30
-HQ1PM11-30
-HQ2PM16-2
-HQ1PM16-2
-HQ4PM11-42
-HQ1PM11-42
-HQ2PM16-101
-HQ2PM16-101
-HQ3PM18-61
-YQ387Rb/86Sr 2.923055 3.389836 2.773318 6.528700 4.065300 4.572700 2.796500 4.023900 4.511800 87Sr/86Sr 0.755071 0.761995 0.745629 0.787613 0.755898 0.764290 0.745911 0.764920 0.766481 2σ 0.000015 0.000015 0.000013 0.000017 0.000016 0.000015 0.000011 0.000021 0.000017 ISr 0.717223 0.718102 0.709161 0.701763 0.702440 0.704160 0.708695 0.711370 0.705204 147Sm/144Nd 0.122363 0.117179 0.122589 0.113100 0.121200 0.116300 0.112900 0.117400 0.113800 143Nd/144Nd 0.512140 0.512120 0.512034 0.512043 0.512183 0.512135 0.511907 0.511884 0.511856 2σ 0.000008 0.000008 0.000011 0.000010 0.000007 0.000010 0.000011 0.000010 0.000006 锆石年龄/
Ma906 906 920 920 920 920 931 931 950 εNd(0) -9.71 -10.10 -11.79 -11.61 -8.88 -9.81 -14.26 -14.71 -15.25 εNd(t) -1.10 -0.88 -3.07 -1.77 0.01 -0.35 -4.29 -5.27 -5.19 fSm/Nd -0.38 -0.40 -0.38 -0.43 -0.38 -0.41 -0.43 -0.40 -0.42 tDM1/Ma 1685 1626 1866 1677 1594 1588 1877 2001 1971 tDM2/Ma 1650 1632 1820 1715 1571 1600 1928 2007 2016
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表 6 新元古代片麻状花岗岩锆石Lu-Hf同位素测试结果
Table 6. Abundances of Lu-Hf of zircons for the Neoproterozoic granitoids
测点 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ U年龄/Ma εHf(0) εHf 1σ tDM1/Ma tDM2/Ma tcDM/Ma fLu/Hf PM16-101-TW3 1 0.078267 0.001728 0.282519 0.000022 934 -8.95 10.62 0.77989 1059 1129 1135 -0.95 2 0.029576 0.000610 0.282286 0.000022 960 -17.19 3.64 0.75455 1351 1588 1603 -0.98 3 0.053245 0.001114 0.282390 0.000021 1005 -13.50 7.99 0.74790 1222 1350 1360 -0.97 4 0.059385 0.001284 0.282426 0.000023 1080 -12.23 10.76 0.79838 1177 1233 1239 -0.96 5 0.061804 0.001398 0.282432 0.000023 895 -12.04 6.90 0.82005 1173 1333 1344 -0.96 6 0.049662 0.001164 0.282376 0.000019 942 -14.01 6.08 0.66361 1244 1421 1433 -0.96 7 0.057377 0.001272 0.282448 0.000024 1003 -11.47 9.88 0.82656 1146 1229 1236 -0.96 8 0.048773 0.001124 0.282397 0.000020 911 -13.27 6.17 0.68598 1214 1391 1403 -0.97 9 0.056592 0.001297 0.282425 0.000021 965 -12.29 8.21 0.72471 1180 1304 1314 -0.96 10 0.052120 0.001192 0.282393 0.000020 930 -13.39 6.43 0.69463 1220 1390 1401 -0.96 PM11-30-TW1 1 0.039581 0.000861 0.282503 0.000023 876 -9.51 9.35 0.78829 1056 1164 1172 -0.97 2 0.065358 0.001441 0.282509 0.000025 858 -9.29 8.84 0.87680 1064 1182 1191 -0.96 4 0.024860 0.000531 0.282389 0.000025 923 -13.54 6.54 0.88984 1205 1378 1389 -0.98 5 0.041721 0.000889 0.282437 0.000025 936 -11.85 8.30 0.86826 1150 1277 1286 -0.97 6 0.036587 0.000791 0.282428 0.000029 889 -12.18 6.99 1.02444 1160 1323 1333 -0.98 8 0.034472 0.000740 0.282361 0.000028 877 -14.53 4.42 0.97299 1251 1476 1489 -0.98 9 0.038083 0.000820 0.282413 0.000025 947 -12.68 7.73 0.88871 1181 1321 1331 -0.98 10 0.029821 0.000656 0.282351 0.000028 924 -14.90 5.11 0.99569 1263 1468 1481 -0.98 PM16-2-TW1 1 0.071121 0.001591 0.282475 0.000023 970 -10.49 9.95 0.81897 1117 1199 1207 -0.95 2 0.078792 0.001721 0.282539 0.000022 978 -8.24 12.27 0.77492 1030 1059 1063 -0.95 3 0.082549 0.001816 0.282496 0.000021 916 -9.75 9.40 0.72463 1093 1192 1200 -0.95 5 0.064821 0.001427 0.282490 0.000022 995 -9.96 11.10 0.75681 1091 1146 1151 -0.96 6 0.099852 0.001917 0.282644 0.000026 870 -4.53 13.59 0.89546 883 891 894 -0.94 7 0.104905 0.002159 0.282601 0.000024 887 -6.06 12.27 0.85205 952 988 992 -0.93 8 0.103184 0.002204 0.282568 0.000026 921 -7.22 11.78 0.92709 1001 1045 1050 -0.93 9 0.073635 0.001636 0.282503 0.000026 931 -9.52 10.05 0.89375 1079 1162 1169 -0.95 10 0.080479 0.001728 0.282535 0.000027 913 -8.39 10.74 0.94546 1036 1105 1111 -0.95 注：PM16-101-TW3锆石Lu-Hf同位素数据据参考文献②
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① 新疆维吾尔自治区地质矿产局.1: 200000地质图温泉幅(L-44-22).1992.
② 新疆维吾尔自治区地质矿产局.1: 50000区域地质调查报告(扎冷木特、柯克他乌、牧区医院、牙马特).2018.
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