Detrital Zircon U-Pb Geochronology of the Dazhuyuan Formation in Northern Guizhou: Implications for Bauxite Mineralization
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摘要: 晚石炭世大竹园组分布于黔北-渝南一带，是重要的含铝土矿层。为示踪铝土矿的成矿物质来源，本文对大竹园铝土矿中的铝土岩进行了激光剥蚀-多接收器电感耦合等离子体质谱(LA-MC-ICP-MS)碎屑锆石年代学研究。结果表明，84组锆石谐和年龄分布于447~2825 Ma之间，集中在505~660 Ma(n=15)、714~794 Ma(n=13)、900~1302 Ma(n=42)和2473~2500 Ma(n=5)四个年龄段。与华南古生界碎屑锆石年龄频谱相比，缺失中、上泥盆统中400~440 Ma的年龄段，更类似于奥陶系-下泥盆统的碎屑锆石年龄频谱。结合区域地质特征，认为:①铝土岩中的碎屑锆石可能为下伏韩家店群(S1hj)中的再循环锆石，韩家店群是铝土矿的重要成矿母岩；②加里东造山事件使华夏和扬子地块发生碰撞拼合，志留纪华夏地块迅速隆升、被剥蚀，为铝土矿的形成提供了大量成矿物质基础。Abstract: The Late Carboniferous Dazhuyuan Formation, an important bauxite bearing bed, lies along the Northern Guizhou-Southern Chongqing formation. For tracing the material source of the bauxite, U-Pb dates on detrital zircon of aluminous from Dazhuyuan bauxite deposit using Laser Ablation-Multicollector Inductively Coupled Plasma-Mass Spectrometry (LA-MC-ICPMS) have been determined. The results show that 84 groups of concordant age are distributed over a wide range, varying from 447 to 2825 Ma, with the main populations ranging from 505-660 Ma (n=5), 714-794 Ma (n=13), 900-1302 Ma (n=42) and 2473-2500 Ma (n=5). Compared with the detrital zircon age spectrum of Paleozoic Clastic of South China, the result lacks the data from about 440-400 Ma, which belongs to the middle-upper Devonian, more similar to a detrital zircon age spectrum of the Ordovician-Lower Devonian. Combined with the regional geological characteristics, it is postulated that (1) the detrital zircons of the aluminous come from the Hanjiadian group (S1hj), which is the important metallogenic parent rocks of the bauxite. (2) The Caledonian orogeny made the collision between the Cathaysian block and the Yangtze block, implying that the Cathaysia block uplifted rapidly and suffered from erosion in the Silurian, which made a foundation providing a large amount of metallogenic material for the formation of the bauxite.
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Key words:
- Dazhuyuan Formation /
- detrital zircon /
- mineralization /
- bauxite /
- Northern Guizhou
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表 1 大竹园铝土岩的LA-MC-ICP-MS碎屑锆石的U-Pb测试结果
Table 1. Detrital zircon U-Pb dating results of aluminous from the Dazhuyuan bauxite deposit
点号 w(Pb)/(μg·g-1) 
207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U 比值 1σ 比值 1σ 比值 1σ 年龄/Ma 1σ 年龄/Ma 1σ 年龄/Ma 1σ DZY-1 260 1.6 0.084000 0.001007 2.260308 0.040370 0.195187 0.002734 1292 24 1200 13 1149 15 DZY-2 207 2.6 0.080895 0.000909 1.844509 0.028984 0.165561 0.002143 1220 22 1061 10 988 12 DZY-3 295 1.9 0.067737 0.000867 1.145260 0.020446 0.122606 0.001541 861 26 775 10 746 9 DZY-4 152 1.9 0.075818 0.000965 1.618283 0.026876 0.155245 0.002223 1100 26 977 10 930 12 DZY-6 94 0.6 0.069599 0.000884 1.202590 0.019919 0.125385 0.001472 917 21 802 9 761 8 DZY-7 95 0.8 0.067264 0.001133 1.103268 0.024196 0.118768 0.001353 856 35 755 12 723 8 DZY-8 272 0.9 0.199825 0.000799 14.228608 0.156894 0.516527 0.005492 2825 6 2765 10 2684 23 DZY-10 132 0.2 0.075508 0.001289 1.621806 0.032441 0.155825 0.001737 1083 35 979 13 934 10 DZY-11 77 0.9 0.071191 0.001545 1.198367 0.031455 0.122166 0.002030 963 44 800 15 743 12 DZY-13 57 0.4 0.073617 0.000615 1.491785 0.019922 0.146894 0.001507 1031 17 927 8 884 8 DZY-14 489 2.9 0.058975 0.000583 0.673348 0.008737 0.082827 0.000808 565 20 523 5 513 5 DZY-15 102 0.6 0.065508 0.000726 1.058949 0.016945 0.117107 0.001221 791 22 733 8 714 7 DZY-16 167 0.9 0.070580 0.000562 1.209501 0.014258 0.124310 0.001258 946 16 805 7 755 7 DZY-18 181 1.0 0.077919 0.000694 1.907179 0.027073 0.177389 0.002083 1146 17 1084 9 1053 11 DZY-19 166 0.8 0.072197 0.000574 1.394698 0.018628 0.140011 0.001628 991 17 887 8 845 9 DZY-20 47 0.8 0.109638 0.001580 4.390446 0.092671 0.290256 0.004961 1794 26 1711 17 1643 25 DZY-21 195 1.3 0.072962 0.000702 1.480085 0.022914 0.146963 0.001822 1013 19 922 9 884 10 DZY-22 89 0.6 0.068301 0.000496 1.311950 0.016046 0.139231 0.001509 877 16 851 7 840 9 DZY-23 252 1.1 0.084394 0.000544 2.332440 0.027475 0.200323 0.002152 1302 7 1222 8 1177 12 DZY-24 240 1.0 0.073769 0.000432 1.574996 0.016611 0.154795 0.001495 1035 11 960 7 928 8 DZY-26 86 0.2 0.077246 0.000504 1.868713 0.021403 0.175345 0.001706 1128 13 1070 8 1041 9 DZY-27 289 1.5 0.161607 0.000903 9.217397 0.108260 0.413519 0.004689 2473 9 2360 11 2231 21 DZY-28 59 0.4 0.076754 0.001545 1.549058 0.036503 0.146472 0.002367 1115 39 950 15 881 13 DZY-29 129 1.2 0.075106 0.000782 1.587368 0.023608 0.153283 0.001769 1072 21 965 9 919 10 DZY-32 20 0.5 0.064730 0.001126 0.873646 0.017577 0.097982 0.001314 765 236 638 10 603 8 DZY-34 76 0.8 0.080735 0.000911 2.014581 0.031292 0.180936 0.002033 1217 22 1120 11 1072 11 DZY-35 174 0.6 0.074616 0.000576 1.598876 0.017891 0.155407 0.001463 1057 16 970 7 931 8 DZY-36 1565 2.8 0.164166 0.001958 9.776507 0.169227 0.431454 0.004886 2499 20 2414 16 2312 22 DZY-37 356 1.7 0.073101 0.001031 1.480363 0.030063 0.146534 0.001611 1017 34 922 12 882 9 DZY-38 340 0.6 0.073916 0.000478 1.623477 0.018845 0.159216 0.001653 1039 13 979 7 952 9 DZY-40 262 0.8 0.060733 0.000509 0.703043 0.010105 0.083888 0.001025 632 21 541 6 519 6 DZY-41 248 1.1 0.076908 0.000771 1.630058 0.026862 0.153534 0.001875 1120 20 982 10 921 10 DZY-43 620 2.1 0.075872 0.000435 1.709532 0.018790 0.163368 0.001617 1092 12 1012 7 975 9 DZY-44 6 2.3 0.056663 0.000929 0.621263 0.011361 0.079672 0.000854 480 40 491 7 494 5 DZY-45 711 1.0 0.167249 0.000780 10.084893 0.097107 0.437307 0.003892 2531 7 2443 9 2339 17 DZY-46 164 0.7 0.075159 0.000706 1.666796 0.022720 0.160912 0.001766 1072 23 996 9 962 10 DZY-47 182 0.7 0.081148 0.000778 2.107716 0.027541 0.188494 0.001907 1225 19 1151 9 1113 10 DZY-48 111 0.9 0.067859 0.000800 1.211085 0.019137 0.129521 0.001476 865 25 806 9 785 8 DZY-49 249 2.1 0.066580 0.000745 1.141188 0.018037 0.124400 0.001434 833 176 773 9 756 8 DZY-51 13 0.2 0.059551 0.001950 0.666104 0.020931 0.081475 0.001737 587 68 518 13 505 10 DZY-52 67 0.8 0.080306 0.001035 1.990364 0.034553 0.180070 0.002586 1206 21 1112 12 1067 14 DZY-53 14 1.2 0.068711 0.000902 1.340879 0.022225 0.141664 0.001613 900 27 864 10 854 9 DZY-54 94 0.2 0.068099 0.000633 1.198079 0.015587 0.127665 0.001269 872 23 800 7 775 7 DZY-57 155 1.7 0.128224 0.001170 6.397771 0.106391 0.361751 0.004915 2074 21 2032 15 1990 23 DZY-58 42 0.2 0.076858 0.000527 1.826559 0.023355 0.172387 0.001936 1118 13 1055 8 1025 11 DZY-59 200 1.3 0.077241 0.000494 1.911900 0.023192 0.179511 0.001878 1128 13 1085 8 1064 10 DZY-60 45 0.7 0.070234 0.001422 1.554264 0.036972 0.160851 0.002580 1000 41 952 15 962 14 DZY-61 228 0.8 0.107760 0.000405 3.849682 0.042295 0.259082 0.002703 1762 7 1603 9 1485 14 DZY-62 35 0.5 0.064992 0.000571 0.933599 0.012350 0.104162 0.001009 774 19 670 6 639 6 DZY-64 5 0.5 0.060956 0.001332 0.725323 0.017349 0.086403 0.001169 639 46 554 10 534 7 DZY-65 82 1.5 0.077967 0.000946 1.702053 0.027783 0.158373 0.001822 1146 24 1009 10 948 10 DZY-67 18 1.7 0.062302 0.001436 1.047273 0.026834 0.122294 0.001959 683 48 728 13 744 11 DZY-68 18 0.2 0.063945 0.000886 0.849563 0.014983 0.096315 0.000938 739 30 624 8 593 6 DZY-69 84 1.6 0.060050 0.000955 0.743041 0.015131 0.089712 0.001058 606 33 564 9 554 6 DZY-70 86 1.0 0.059172 0.000537 0.614267 0.008920 0.075280 0.000823 572 20 486 6 468 5 DZY-71 17 0.6 0.076427 0.001184 1.745434 0.032973 0.165859 0.002305 1106 30 1025 12 989 13 DZY-72 78 1.0 0.072534 0.000655 1.537240 0.019483 0.153755 0.001480 1011 19 945 8 922 8 DZY-73 190 0.7 0.104721 0.000314 4.382576 0.039884 0.303540 0.002651 1710 6 1709 8 1709 13 DZY-74 3 0.6 0.063917 0.001518 0.857877 0.022722 0.097468 0.001521 739 50 629 12 600 9 DZY-75 40 1.4 0.074713 0.000967 1.635913 0.029262 0.158835 0.002112 1061 26 984 11 950 12 DZY-76 71 0.8 0.065345 0.000431 1.084570 0.011616 0.120359 0.001073 787 13 746 6 733 6 DZY-77 124 1.4 0.072840 0.000416 1.664695 0.017832 0.165692 0.001549 1009 11 995 7 988 9 DZY-78 176 0.6 0.161478 0.000544 9.525714 0.096541 0.427694 0.004288 2472 6 2390 9 2295 19 DZY-80 26 0.9 0.077469 0.001274 1.843364 0.042371 0.172400 0.002689 1133 32 1061 15 1025 15 DZY-81 229 5.6 0.074130 0.000618 1.619865 0.021603 0.158434 0.001809 1056 17 978 8 948 10 DZY-82 48 0.4 0.061894 0.000417 0.871391 0.009967 0.102080 0.001023 672 13 636 5 627 6 DZY-83 144 0.8 0.070845 0.000381 1.544302 0.015089 0.158097 0.001451 954 11 948 6 946 8 DZY-84 208 0.6 0.072324 0.000283 1.619648 0.014881 0.162346 0.001431 994 8 978 6 970 8 DZY-85 165 0.7 0.071079 0.000363 1.552787 0.016050 0.158316 0.001430 961 10 952 6 947 8 DZY-86 135 0.3 0.070318 0.000412 1.391468 0.016968 0.143412 0.001530 939 12 885 7 864 9 DZY-87 190 0.8 0.067188 0.000375 1.214271 0.013071 0.131028 0.001289 843 12 807 6 794 7 DZY-88 385 1.4 0.079307 0.000350 2.177104 0.019869 0.198968 0.001651 1189 8 1174 6 1170 9 DZY-89 342 0.4 0.130696 0.000425 6.497753 0.058526 0.360360 0.003174 2107 6 2046 8 1984 15 DZY-90 2878 2.0 0.163223 0.000562 10.287660 0.098524 0.456865 0.004321 2500 6 2461 9 2426 19 DZY-91 298 0.6 0.081009 0.000424 2.065544 0.022167 0.184787 0.001728 1222 9 1137 7 1093 9 DZY-92 64 0.5 0.074309 0.000623 1.715894 0.020356 0.167448 0.001572 1050 50 1014 8 998 9 DZY-93 179 1.1 0.059593 0.000576 0.702914 0.008460 0.085555 0.000726 587 20 541 5 529 4 DZY-94 141 1.0 0.063734 0.000536 0.919265 0.009410 0.104686 0.000872 731 17 662 5 642 5 DZY-95 61 0.3 0.063679 0.000590 0.947262 0.011796 0.107828 0.000911 731 14 677 6 660 5 DZY-96 65 0.8 0.075073 0.000871 1.609097 0.022041 0.155585 0.001663 1072 19 974 9 932 9 DZY-97 133 1.6 0.059992 0.001060 0.732299 0.015136 0.088467 0.000900 611 39 558 9 546 5 DZY-98 81 0.5 0.056545 0.000514 0.559911 0.007414 0.071780 0.000676 472 20 451 5 447 4 DZY-99 125 1.4 0.065139 0.000657 1.174023 0.015973 0.130782 0.001342 789 17 789 7 792 8 DZY-100 133 1.0 0.189506 0.001124 13.606214 0.248462 0.520381 0.008834 2739 10 2723 17 2701 37 
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