Tracing of detrital provenance of Late Triassic Strata in the "Golden Triangle" area of Yunnan, Guizhou and Guangxi
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摘要:
三叠系是滇黔桂分布最广泛的岩系,赋存卡林型金矿等各种低温矿产。在前人研究基础上,运用LA-ICP-MS分析技术,对滇黔桂"金三角"地区的碎屑锆石进行了U-Pb测年。结果显示,大部分锆石具岩浆环带,Th/U值大于0.4,锆石U-Pb年龄集中在308~396 Ma、440~680 Ma、727~930 Ma、1004~1266 Ma、1400~1880 Ma、2360~2724 Ma六个区段。通过对比研究区及周围地块的碎屑锆石年龄分布特征,结合研究区岩相古地理、古海流及古流向,综合分析认为,研究区物源以越北古陆为主,同时湘粤桂构造山系和云开地区也可能提供了部分物源。该物源印证了古特提斯洋在印支期逐渐闭合,华南陆块与印支地块沿松马缝合带发生碰撞。
Abstract:Triassic strata are most widely distributed rock series in Yunnan, Guizhou and Guangxi, and host various low-temperature mineral resources such as Carlin type gold deposits.Previous studies of the Triassic stratigraphic provenance in this area are quite rich; nevertheless, they are mainly concentrated on the Early and Middle Triassic strata, but lack the data on clastic provenance of late Triassic strata.Therefore, on the basis of previous studies, the U-Pb age of detrital zircons in the study area was measured by LA-ICP-MS analysis technology.The results show that most zircons have magmatic zones with Th/U ratios higher than 0.4.The U-Pb ages of zircons are concentrated in 308~396 Ma, 440~680 Ma, 727~930 Ma, 1004~1266 Ma, 1400~1880 Ma and 2360~2724 Ma.By comparing the age distribution characteristics of detrital zircons between the study area and the surrounding blocks and in combination with the lithofacies palaeogeography, palaeo-ocean current and palaeo-current, the authors hold that the provenance of the study area was mainly from the North Vietnam Palaeocontinent.At the same time, the tectonic mountain system of Hunan, Guangdong, Guangxi and Yunkai area probably also provided some provenances.The provenance proves that the Paleo-Tethyan Ocean was closed gradually during the Indosinian period, and the South China block collided with the Indosinian block along the Songma suture zone.
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图 1 滇黔桂“金三角”区域地质图(据参考文献[9]修改)
Figure 1.
图 5 滇黔桂地区晚三叠世卡尼期岩相古地理略图(据参考文献[20]修改)
图 7 滇黔桂地区晚三叠世中、后期岩相古地理略图(据参考文献[18]修改)
Figure 7.
图 8 右江盆地三叠纪浊积岩碎屑物源区大地构造环境判别图(据参考文献[55]修改)
Figure 8.
表 1 研究区碎屑锆石U-Th-Pb分析结果
Table 1. Zircon U-Th-Pb andgsos results of the rocks from the study area
测点号 含量/10-6 Th/U 比值 年龄/Ma Pb Th U 207Pb/206Pb 2071σ 207Pb/235U 2071σ 206Pb/238U 2061σ 208Pb/232Th 2081σ 207Pb/206Pb 2071σ 207Pb/235U 2071σ 206Pb/238U 2061σ 208Pb/232Th 2081σ ZS-01 208 193 294 0.65 0.184 0.006 11.8 0.40 0.458 0.012 0.144 0.005 2694 55 2587 32 2432 56 2372 96 ZS-02 250 295 375 0.79 0.166 0.005 10.2 0.40 0.438 0.012 0.125 0.004 2520 55 2450 31 2342 56 2385 80 ZS-03 44 332 336 0.99 0.062 0.002 0.7 0.03 0.085 0.002 0.026 0.001 672 94 557 18 527 14 525 19 ZS-04 31 71 317 0.23 0.067 0.003 0.9 0.06 0.095 0.004 0.059 0.009 833 147 633 34 583 26 1155 188 ZS-05 135 435 139 3.12 0.171 0.006 9.6 0.40 0.405 0.012 0.124 0.004 2571 65 2406 38 2193 59 2364 88 ZS-06 26 80 115 0.69 0.074 0.003 1.6 0.07 0.154 0.004 0.045 0.002 1053 96 960 28 923 27 947 40 ZS-07 25 75 150 0.50 0.071 0.003 1.6 0.06 0.119 0.003 0.042 0.002 942 110 782 27 727 21 829 39 ZS-08 121 290 652 0.45 0.066 0.002 1.3 0.05 0.135 0.004 0.040 0.001 809 81 825 23 817 23 799 32 ZS-09 36 79 182 0.44 0.068 0.002 1.4 0.06 0.144 0.004 0.044 0.001 862 84 875 23 868 23 862 37 ZS-10 74 172 300 0.57 0.071 0.002 1.8 0.07 0.176 0.005 0.076 0.003 980 76 1035 25 1042 30 1486 74 ZS-11 6 12 47 0.27 0.071 0.004 0.9 0.06 0.103 0.003 0.037 0.002 972 143 693 32 630 22 734 56 ZS-12 8 30 47 0.66 0.066 0.004 1.1 0.08 0.125 0.004 0.039 0.002 812 154 760 35 759 27 782 50 ZS-13 232 361 344 1.05 0.151 0.005 8.7 0.30 0.408 0.011 0.109 0.004 2360 60 2308 31 2207 53 2100 74 ZS-14 39 156 287 0.54 0.061 0.002 0.8 0.04 0.097 0.002 0.032 0.001 674 95 613 19 597 16 645 26 ZS-15 61 518 640 0.81 0.059 0.002 0.5 0.02 0.063 0.001 0.020 0.001 594 90 432 14 396 11 406 17 ZS-16 194 151 1412 0.10 0.067 0.002 1.1 0.04 0.114 0.003 0.034 0.001 855 74 743 21 696 20 684 34 ZS-17 35 164 211 0.77 0.064 0.003 1.0 0.04 0.111 0.003 0.033 0.001 764 103 695 22 681 20 659 28 ZS-18 83 95 156 0.60 0.118 0.004 6.3 0.24 0.375 0.010 0.096 0.003 1936 64 2013 32 2056 51 1860 65 ZS-19 18 34 76 0.45 0.077 0.003 1.8 0.09 0.172 0.005 0.054 0.002 1144 99 1062 31 1026 28 1046 56 ZS-20 40 100 157 0.63 0.076 0.003 1.9 0.08 0.174 0.005 0.054 0.002 1120 87 1077 28 1038 28 1082 45 ZS-21 36 95 186 0.51 0.074 0.003 1.5 0.07 0.143 0.004 0.043 0.001 1057 106 929 29 862 23 859 38 ZS-22 56 157 327 0.48 0.068 0.002 1.2 0.06 0.129 0.003 0.040 0.002 875 88 816 25 784 22 798 45 ZS-23 67 107 620 0.17 0.057 0.002 0.7 0.03 0.085 0.002 0.031 0.001 524 85 534 15 529 14 626 38 ZS-24 136 164 292 0.56 0.126 0.004 5.7 0.20 0.319 0.008 0.088 0.005 2045 62 1927 30 1789 43 1712 109 ZS-25 170 384 614 0.62 0.090 0.003 2.5 0.09 0.196 0.005 0.048 0.003 1435 68 1270 26 1157 29 951 60 ZS-26 195 198 390 0.50 0.138 0.004 6.7 0.22 0.343 0.009 0.100 0.005 2213 58 2070 29 1903 44 1932 108 ZS-27 161 61 280 0.21 0.157 0.005 9.5 0.32 0.430 0.012 0.106 0.006 2423 55 2388 30 2308 54 2049 109 ZS-28 62 378 433 0.87 0.058 0.002 0.8 0.03 0.098 0.002 0.029 0.001 568 86 604 17 605 16 577 26 ZS-29 32 114 144 0.79 0.080 0.003 1.7 0.07 0.155 0.004 0.047 0.002 1266 83 1016 26 933 25 929 39 ZS-30 373 319 387 0.82 0.170 0.030 9.6 0.04 0.399 0.003 0.123 0.003 2564 103 2395 53 2168 151 2348 73 ZS-31 196 422 993 0.42 0.072 0.010 1.5 0.19 0.143 0.009 0.046 0.009 1009 89 915 78 863 52 915 81 ZS-32 112 20 602 0.03 0.099 0.002 3.5 0.09 0.246 0.003 0.074 0.006 1633 51 1517 22 1418 20 1448 113 ZS-33 72 204 393 0.51 0.069 0.002 1.0 0.04 0.111 0.001 0.038 0.001 909 76 743 17 680 8 759 31 ZS-34 14 32 77 0.42 0.074 0.003 1.3 0.06 0.128 0.002 0.044 0.002 1066 95 853 24 780 15 883 42 ZS-35 29 86 183 0.46 0.067 0.003 1.0 0.05 0.108 0.002 0.033 0.001 877 102 719 26 661 12 671 31 ZS-36 268 845 1805 0.46 0.064 0.002 1.2 0.04 0.135 0.002 0.042 0.001 742 66 804 17 821 11 840 30 ZS-37 203 761 954 0.79 0.075 0.002 1.6 0.06 0.159 0.002 0.051 0.001 1072 69 996 21 955 12 1010 33 ZS-38 518 1491 2398 0.62 0.072 0.001 1.7 0.05 0.175 0.002 0.056 0.001 990 21 1033 17 1042 13 1104 31 ZS-39 69 272 426 0.63 0.063 0.002 1.2 0.05 0.132 0.002 0.045 0.001 722 89 777 21 801 15 892 34 ZS-40 200 836 1124 0.74 0.074 0.002 1.4 0.05 0.131 0.002 0.043 0.001 1064 77 870 19 796 11 860 26 ZS-41 438 436 1059 0.41 0.129 0.003 6.3 0.16 0.350 0.005 0.102 0.003 2087 43 2021 21 1936 24 1979 57 ZS-42 722 721 1251 0.57 0.165 0.004 9.4 0.25 0.405 0.006 0.128 0.004 2513 41 2379 24 2193 30 2438 73 ZS-43 211 875 1000 0.87 0.071 0.002 1.4 0.04 0.139 0.002 0.043 0.001 983 68 889 16 842 12 851 27 ZS-44 258 364 1716 0.21 0.070 0.002 1.3 0.04 0.136 0.001 0.046 0.001 936 62 866 16 827 10 919 36 ZS-45 89 203 587 0.34 0.071 0.003 1.3 0.06 0.129 0.003 0.040 0.002 961 97 841 27 786 17 806 42 ZS-46 390 1348 1652 0.81 0.072 0.002 1.6 0.05 0.155 0.002 0.047 0.001 994 64 961 17 934 12 936 28 ZS-47 156 414 1038 0.39 0.067 0.002 1.2 0.04 0.121 0.001 0.039 0.001 855 76 775 19 738 10 787 28 ZS-48 442 366 4515 0.08 0.062 0.001 0.9 0.02 0.096 0.001 0.033 0.001 705 52 625 11 594 7 671 26 ZS-49 100 391 473 0.82 0.070 0.003 1.3 0.06 0.138 0.003 0.047 0.001 931 94 862 24 833 18 931 34 ZS-50 1043 1160 1341 0.86 0.162 0.004 10.8 0.31 0.472 0.008 0.139 0.004 2483 48 2506 26 2492 35 2645 84 ZS-51 165 643 621 1.03 0.075 0.003 1.7 0.07 0.165 0.003 0.047 0.001 1075 89 1022 26 987 17 943 37 ZS-52 620 1073 3187 0.33 0.073 0.002 1.7 0.04 0.163 0.002 0.049 0.001 1035 55 1005 17 974 12 983 30 ZS-53 336 430 3636 0.11 0.060 0.001 0.7 0.02 0.089 0.001 0.030 0.001 612 59 574 11 554 7 598 22 ZS-54 181 323 1404 0.23 0.068 0.002 1.1 0.04 0.114 0.001 0.037 0.001 900 72 752 17 697 9 743 32 ZS-55 116 209 838 0.24 0.069 0.002 1.2 0.04 0.120 0.002 0.041 0.001 927 75 784 19 731 13 819 34 ZS-56 1730 881 2842 0.30 0.170 0.004 12.8 0.48 0.534 0.015 0.062 0.003 2564 49 2662 35 2759 64 1231 60 ZS-57 84 275 383 0.71 0.078 0.003 1.6 0.07 0.146 0.003 0.046 0.002 1169 65 973 29 881 18 924 41 ZS-58 86 293 821 0.35 0.062 0.002 0.7 0.03 0.086 0.001 0.025 0.001 675 98 562 17 534 9 505 25 ZS-59 235 1791 678 2.64 0.068 0.002 1.2 0.05 0.123 0.002 0.035 0.001 895 81 793 21 750 11 714 21 ZS-60 405 1537 2042 0.75 0.071 0.001 1.4 0.04 0.136 0.001 0.036 0.001 964 53 871 15 826 10 717 22 ZS-61 146 1121 842 1.33 0.060 0.002 0.8 0.03 0.090 0.001 0.027 0.001 616 90 569 16 559 8 549 18 ZS-62 66 334 303 1.10 0.070 0.003 1.2 0.05 0.124 0.002 0.035 0.001 953 94 808 25 757 14 709 26 ZS-63 141 859 1015 0.84 0.056 0.002 0.7 0.03 0.087 0.001 0.027 0.001 487 90 53 16 541 8 550 20 ZS-64 373 1679 3550 0.47 0.056 0.001 0.6 0.02 0.079 0.001 0.029 0.001 500 75 498 15 495 10 585 28 ZS-65 20 63 171 0.36 0.063 0.004 0.8 0.05 0.100 0.003 0.028 0.002 724 158 618 29 614 18 565 41 ZS-66 66 234 280 0.83 0.066 0.003 1.4 0.07 0.155 0.003 0.043 0.001 812 99 896 28 934 18 863 33 ZS-67 42 156 333 0.46 0.063 0.003 0.9 0.05 0.098 0.002 0.030 0.001 744 122 628 25 605 12 609 31 ZS-68 108 888 605 1.46 0.054 0.002 0.7 0.03 0.088 0.001 0.026 0.001 409 105 525 18 549 9 524 18 ZS-69 620 287 1132 0.25 0.167 0.013 9.5 0.62 0.433 0.016 0.310 0.094 2531 134 2389 60 2322 75 2453 14 ZS-70 310 746 1342 0.55 0.081 0.003 2.1 0.09 0.183 0.004 0.047 0.002 1242 92 1145 31 1086 26 939 53 ZS-71 127 429 545 0.78 0.071 0.003 1.5 0.07 0.154 0.003 0.045 0.002 983 94 974 27 924 16 895 42 ZS-72 410 913 1213 0.75 0.087 0.002 2.8 0.09 0.225 0.003 0.065 0.002 1375 64 1346 22 1311 18 1274 48 ZS-73 276 812 2331 0.34 0.065 0.002 0.9 0.02 0.102 0.001 0.027 0.002 781 70 668 14 626 8 540 21 ZS-74 290 350 442 0.79 0.156 0.004 9.0 0.26 0.411 0.007 0.116 0.004 2417 48 2338 26 2222 34 2219 74 ZS-75 199 2072 1152 1.79 0.057 0.002 0.6 0.02 0.079 0.001 0.023 0.001 498 88 497 15 490 6 473 14 ZS-76 125 422 1309 0.32 0.058 0.002 0.7 0.02 0.083 0.001 0.024 0.001 561 79 529 14 515 7 498 19 ZS-77 55 229 306 0.74 0.066 0.002 1.1 0.05 0.124 0.002 0.036 0.001 833 89 774 21 753 14 732 29 ZS-78 97 383 461 0.83 0.067 0.002 1.3 0.06 0.141 0.002 0.043 0.001 866 88 862 24 853 16 860 30 ZS-79 150 314 1038 0.38 0.071 0.002 1.3 0.05 0.129 0.003 0.039 0.001 961 73 843 24 785 18 778 36 ZS-80 174 1040 738 1.40 0.068 0.002 1.2 0.04 0.121 0.002 0.038 0.001 900 82 781 20 738 13 761 26 ZS-81 299 2216 2331 0.95 0.059 0.001 0.7 0.02 0.086 0.001 0.024 0.000 587 70 548 14 533 11 489 19 ZS-82 348 355 803 0.44 0.110 0.003 5.0 0.13 0.325 0.004 0.106 0.004 1812 49 1823 22 1815 24 2047 76 ZS-83 163 479 926 0.51 0.069 0.002 1.3 0.04 0.129 0.002 0.041 0.001 905 66 821 17 785 12 830 29 ZS-84 371 660 4115 0.16 0.062 0.001 0.7 0.03 0.084 0.001 0.028 0.001 683 54 562 14 525 11 560 25 ZS-85 229 270 664 0.41 0.104 0.003 3.8 0.11 0.259 0.003 0.074 0.002 1709 57 1591 23 1487 17 1459 54 ZS-86 52 346 344 1.00 0.060 0.003 0.8 0.04 0.088 0.002 0.028 0.001 635 120 567 24 548 13 560 28 ZS-87 133 301 759 0.40 0.078 0.003 1.4 0.05 0.132 0.003 0.030 0.001 1153 77 905 21 801 22 600 25 ZS-88 247 1766 3562 0.49 0061 0.002 0.4 0.01 0.051 0.001 0.016 0.001 661 72 372 10 325 4 337 12 ZS-89 124 387 694 0.55 0076 0.002 1.4 0.06 0.131 0.002 0.039 0.001 1101 77 889 25 796 16 778 31 ZS-90 87 95 873 0.10 0.066 0.002 0.8 0.03 0.084 0.002 0.030 0.001 816 82 583 18 519 16 602 37 ZS-91 24 187 178 1.05 0.068 0.003 0.9 0.04 0.091 0.002 0.029 0.001 883 96 635 22 563 16 583 25 ZS-92 594 633 1641 0.38 0.120 0.003 4.7 0.12 0.281 0.003 0.080 0.002 1986 45 1774 20 1599 18 1571 47 ZS-93 136 375 1142 1.09 0.071 0.003 1.1 0.04 0.109 0.001 0.035 0.001 958 86 740 20 666 11 708 30 ZS-94 61 357 343 1.04 0.071 0.002 1.1 0.04 0.112 0.003 0.037 0.001 975 78 761 20 685 17 747 27 ZS-95 277 236 520 0.45 0.159 0.005 8.3 0.32 0.371 0.011 0.096 0.003 2446 58 2262 34 2037 53 1860 72 表 2 越北古陆部分锆石年龄[24]
Table 2. Partial zircon ages of the North Vietnam Block
测试对象 样品号 岩石成因或构造背景 分析方法 年龄/Ma 越南马江镇 VN-21-00 N-MORB Sm-Nd单矿物或全岩 387±56 越南马江镇变辉长岩 VN-22-00 N-MORB 338±24 越南马江镇辉长岩 VN-32-00 N-MORB 322±45 越南Chieng Khuong角闪岩 VN-34-00 N-MORB 315±92 越南Quan Hoa变辉长岩 VN-05-00 N-MORB 313±32 注:N-MORB为正常洋中脊玄武岩 -
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