The Constraints of Carbonaceous Mudstone Re-Os and Detrital Zircons U-Pb Isotopic Dating on the Diagenetic and Metallogenic Ages from the Dabaoshan Copper Deposit in Guangdong Province
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摘要:
Re-Os同位素作为一种强有力的技术工具, 在黑色页岩沉积时代的精确定年中得到了广泛应用。随着高精度负离子热电离质谱(N-TIMS)测试技术的发展，炭质泥岩Re-Os同位素年龄测试越来越多地被应用于厘定沉积时代。广东省大宝山铜矿成岩成矿时代争议一直是制约成因机制研究的关键因素。本文通过Carius管中逆王水溶解炭质泥岩粉末后，使用负离子热电离质谱法(N-TIMS)测试Re-Os同位素含量，获得Re-Os等时线年龄为195Ma，LA-ICP-MS碎屑锆石U-Pb年龄结果宽泛，并发育多个峰期，其中最年轻的源区岩浆锆石形成于印支期。这间接地约束了大宝山矿区侵入于侏罗系之中的英安斑岩和斑岩型铜矿的成岩成矿时代为燕山早期。同时，碎屑锆石U-Pb年龄分布特征进一步表明下侏罗统金鸡组形成于稳定大陆边缘，其碎屑物质主要来源于古老的大陆基底。
Abstract:BACKGROUND With the development of high-precision negative thermal ionization mass spectrometry (N-TIMS) technology, Re-Os isotopic dating of carbonaceous mudstone is more and more widely used in the determination of sedimentary age. The controversy over the diagenetic and metallogenic ages of the Dabaoshan copper deposit in Guangdong Province has always been a key restricting the study of the genetic mechanism.
OBJECTIVES To constrain the diagenetic and metallogenic ages of the Dabaoshan copper deposit.
METHODS Re-Os isotope ratios were determined by high precision N-TIMS after dissolving carbonaceous mudstone powder by reverse aqua regia in the Carius tube. Zircon U-Pb age was determined by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS).
RESULTS (1) The contents of Re and Os ranged from 0.976×10-9 to 2.997×10-9 and 0.067×10-9 to 0.115×10-9, respectively. The 187Re/188Os ratio varied from 78.236 to 154.799, and the 187Os/188Os ratio varied from 1.642 to 1.885. The Re-Os isotopic isochron age of black carbonaceous mudstone was 195±28Ma (n=6, MSWD=17). (2) The 206Pb/238U age ranged from 2631 to 236Ma, including two Mesozoic zircons, accounting for 2.50% of the total zircons, 19 Paleozoic zircons, accounting for 23.8% of the total zircons, 58 proterozoic zircons, accounting for 73% of the total zircons, 1 Archean zircon, accounting for 1% of the total zircons. The results of detrital zircon U-Pb age were broad and developed multiple peak periods, among which the youngest source magmatic zircon was formed in the Indosinian period.
CONCLUSIONS The diagenetic and metallogenic age of the Dabaoshan copper deposit in Guangdong Province was constrained to the early Yanshanian. The distribution characteristics of detrital zircon U-Pb age further indicate that the Lower Jurassic Jinji Formation was formed at the stable continental margin, and its detrital material comes mainly from the ancient continental basement.
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表 1 广东省大宝山矿区侏罗系黑色炭质泥岩Re-Os同位素数据
Table 1. Re-Os isotope data of the Jurassic black carbonaceous mudstone from the Dabaoshan ore field in Guangdong Province
样品编号 Re含量(×10-9) Os含量(×10-12) 187Re/188Os 187Os/188Os 测定值 不确定度 测定值 不确定度 测定值 不确定度 测定值 不确定度 DBS-1 1.994 0.015 103 0.8 113.012 1.164 1.769 0.004 DBS-2 1.293 0.010 95 0.7 78.236 0.800 1.642 0.004 DBS-3 2.997 0.022 115 0.9 154.799 1.572 1.885 0.003 DBS-4 1.448 0.004 90 0.3 93.064 0.434 1.686 0.003 DBS-5 1.506 0.004 92 0.3 95.174 0.437 1.686 0.002 DBS-6 0.976 0.003 67 1.3 85.336 1.966 1.655 0.049 空白 0.013 0.00012 1.4 0.2 64.805 1.144 2.479 0.076 
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表 2 广东省大宝山矿区侏罗系石英砂岩中碎屑锆石LA-ICP-MS分析结果
Table 2. LA-ICP-MS analysis results of detrital zircon from Jurassic quartz sandstone in Dabaoshan ore field in Guangdong Province
测点 Th (×10-6) U (×10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 比值 1σ 比值 1σ 比值 1σ 比值 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ 1 309 721 0.43 0.1131 0.0024 5.1917 0.1117 0.3329 0.0068 0.0859 0.0011 1850 37.9 1851 18.3 1852 32.7 1665 20.3 2 61.2 122 0.50 0.0742 0.0016 1.7805 0.0395 0.1741 0.0036 0.0484 0.0007 1046 43.7 1038 14.4 1035 19.5 955 12.9 3 56.8 133 0.43 0.0604 0.0014 0.8372 0.0192 0.1006 0.0021 0.0289 0.0004 617 48.5 618 10.6 618 12.1 576 8.5 4 34.0 296 0.11 0.0634 0.0014 1.1234 0.0246 0.1286 0.0026 0.0359 0.0006 721 45.4 765 11.8 780 14.9 713 10.8 5 90.0 214 0.42 0.1641 0.0035 9.9105 0.2135 0.4379 0.0089 0.1161 0.0015 2499 35.4 2427 19.9 2341 39.9 2221 27.1 6 505 429 1.18 0.0571 0.0013 0.5516 0.0122 0.0701 0.0014 0.0188 0.0002 494 47.4 446 8.0 437 8.6 377 4.8 7 292 1216 0.24 0.0571 0.0012 0.5497 0.0121 0.0699 0.0014 0.0197 0.0003 493 47.1 445 7.9 435 8.6 395 5.4 8 156 469 0.33 0.0722 0.0016 1.6036 0.0347 0.1611 0.0033 0.0454 0.0006 992 42.9 972 13.5 963 18.1 897 11.4 9 119 199 0.60 0.0718 0.0016 1.6334 0.0362 0.1649 0.0034 0.0449 0.0006 981 44.2 983 14.0 984 18.6 888 11.8 10 88.5 431 0.21 0.1243 0.0027 6.1435 0.1323 0.3585 0.0073 0.0933 0.0012 2019 37.3 1996 18.8 1975 34.5 1803 22.5 11 281 679 0.41 0.0547 0.0012 0.3261 0.0073 0.0433 0.0009 0.0121 0.0002 399 48.4 287 5.6 273 5.4 243 3.3 12 139 774 0.18 0.1124 0.0024 5.1298 0.1104 0.3309 0.0067 0.0849 0.0011 1839 38.1 1841 18.3 1843 32.4 1647 20.4 13 353 450 0.78 0.0565 0.0013 0.5300 0.0120 0.0680 0.0014 0.0184 0.0003 472 49.8 432 8.0 424 8.4 369 5.0 14 223 234 0.95 0.0667 0.0015 1.1851 0.0270 0.1289 0.0026 0.0368 0.0005 828 46.7 794 12.6 782 15.0 730 9.7 15 165 237 0.70 0.0726 0.0016 1.6308 0.0357 0.1630 0.0033 0.0455 0.0006 1002 43.6 982 13.8 973 18.3 900 11.5 16 78.3 320 0.24 0.0569 0.0013 0.5384 0.0121 0.0687 0.0014 0.0193 0.0003 485 49.0 437 8.0 428 8.4 387 5.9 17 292 337 0.87 0.0677 0.0015 1.3225 0.0292 0.1416 0.0029 0.0383 0.0005 861 44.9 856 12.8 854 16.2 760 9.7 18 132 168 0.78 0.1379 0.0030 7.0684 0.1531 0.3717 0.0075 0.0941 0.0012 2201 36.9 2120 19.3 2037 35.4 1817 22.4 19 156 258 0.61 0.0738 0.0016 1.7600 0.0384 0.1730 0.0035 0.0472 0.0006 1036 43.2 1031 14.1 1029 19.2 933 11.8 20 275 318 0.87 0.1605 0.0034 9.6060 0.2070 0.4341 0.0088 0.1074 0.0014 2461 35.7 2398 19.8 2324 39.4 2062 24.8 21 161 303 0.53 0.0533 0.0012 0.3173 0.0074 0.0431 0.0009 0.0124 0.0002 343 51.7 280 5.7 272 5.4 248 3.6 22 101 269 0.37 0.1327 0.0028 7.1128 0.1534 0.3888 0.0078 0.1018 0.0013 2134 37.0 2126 19.2 2117 36.4 1959 24.1 23 450 2200 0.20 0.0586 0.0013 0.4539 0.0098 0.0562 0.0011 0.0175 0.0002 552 46.4 380 6.9 352 6.9 351 4.5 24 200 253 0.79 0.0565 0.0013 0.5360 0.0122 0.0687 0.0014 0.0196 0.0003 473 50.2 436 8.1 429 8.4 392 5.3 25 122 433 0.28 0.0719 0.0017 1.5740 0.0361 0.1588 0.0032 0.0482 0.0008 983 46.1 960 14.2 950 18.0 952 15.4 26 138 94.1 1.47 0.0706 0.0016 1.5824 0.0358 0.1625 0.0033 0.0426 0.0006 946 45.7 963 14.1 971 18.3 844 10.8 27 37.9 265 0.14 0.0803 0.0017 2.3661 0.0516 0.2136 0.0043 0.0589 0.0009 1205 42.2 1232 15.6 1248 22.9 1156 16.2 28 25.0 34.8 0.72 0.0771 0.0019 1.9002 0.0459 0.1787 0.0037 0.0507 0.0008 1124 47.8 1081 16.1 1060 20.2 999 15.4 29 106 423 0.25 0.0554 0.0012 0.5262 0.0117 0.0689 0.0014 0.0208 0.0003 429 48.4 429 7.8 429 8.4 416 5.9 30 79.7 586 0.14 0.1144 0.0025 5.0907 0.1097 0.3226 0.0065 0.0879 0.0012 1871 38.2 1835 18.3 1803 31.6 1703 21.6 31 183 654 0.28 0.1548 0.0033 8.1903 0.1762 0.3837 0.0077 0.1059 0.0013 2399 36.0 2252 19.5 2094 35.9 2034 24.5 32 68.8 68 1.02 0.0775 0.0018 2.0489 0.0470 0.1918 0.0039 0.0532 0.0007 1133 45.1 1132 15.6 1131 21.1 1047 14.0 33 970 469 2.07 0.0721 0.0016 1.5924 0.0352 0.1602 0.0032 0.0424 0.0005 988 44.4 967 13.8 958 18.0 839 10.4 34 41.6 244 0.17 0.0755 0.0017 1.8226 0.0401 0.1751 0.0035 0.0500 0.0007 1082 43.5 1054 14.4 1040 19.3 987 14.3 35 33.8 63.6 0.53 0.0754 0.0018 1.8483 0.0429 0.1778 0.0036 0.0509 0.0008 1079 46.2 1063 15.3 1055 19.8 1004 14.9 36 1009 2499 0.40 0.0805 0.0018 0.4339 0.0094 0.0391 0.0008 0.0156 0.0002 1210 42.1 366 6.7 247 4.9 314 4.0 37 14.9 715 0.02 0.1088 0.0023 4.4195 0.0952 0.2946 0.0059 0.1117 0.0017 1779 38.8 1716 17.8 1665 29.4 2140 30.0 38 64.3 61.3 1.05 0.0663 0.0016 1.1646 0.0274 0.1275 0.0026 0.0357 0.0005 814 48.8 784 12.9 774 14.8 709 9.8 39 54.5 42.4 1.29 0.0614 0.0018 0.7087 0.0199 0.0837 0.0018 0.0248 0.0004 654 60.3 544 11.8 518 10.5 495 7.8 40 401 611 0.66 0.0668 0.0015 1.1687 0.0254 0.1269 0.0025 0.0340 0.0004 831 44.6 786 11.9 770 14.6 675 8.4 41 146 264 0.55 0.0706 0.0016 1.5504 0.0345 0.1593 0.0032 0.0456 0.0006 946 45.1 951 13.7 953 17.8 901 12.0 42 247 59.8 4.13 0.1640 0.0036 10.5879 0.2306 0.4683 0.0094 0.1151 0.0014 2497 36.3 2488 20.2 2476 41.4 2202 26.1 43 32.7 38.7 0.84 0.0673 0.0017 1.1909 0.0301 0.1283 0.0026 0.0358 0.0006 848 52.5 796 14.0 778 15.1 711 11.2 44 179 287 0.62 0.0720 0.0016 1.5874 0.0349 0.1599 0.0032 0.0449 0.0006 986 44.3 965 13.7 956 17.8 887 11.4 45 111 157 0.71 0.0560 0.0014 0.5552 0.0135 0.0720 0.0015 0.0199 0.0003 450 53.5 448 8.8 448 8.8 399 6.0 46 110 165 0.67 0.0778 0.0017 2.0471 0.0450 0.1907 0.0038 0.0531 0.0007 1143 43.3 1131 15.0 1125 20.7 1046 13.3 47 206 304 0.68 0.0690 0.0015 1.2194 0.0270 0.1281 0.0026 0.0394 0.0005 900 45.2 810 12.4 777 14.7 782 10.1 48 212 202 1.05 0.0594 0.0014 0.6849 0.0155 0.0837 0.0017 0.0241 0.0003 580 48.8 530 9.4 518 10.0 481 6.2 49 51.7 85.1 0.61 0.0745 0.0018 1.4891 0.0361 0.1450 0.0030 0.0423 0.0007 1054 49.1 926 14.7 873 16.7 838 13.7 50 243 668 0.36 0.0560 0.0012 0.5229 0.0115 0.0677 0.0014 0.0185 0.0002 453 48.1 427 7.7 422 8.2 370 4.9 51 196 439 0.45 0.1571 0.0034 10.0893 0.2172 0.4658 0.0093 0.1124 0.0014 2425 36.2 2443 19.9 2465 40.8 2154 25.6 52 85.1 140 0.61 0.0574 0.0016 0.5433 0.0145 0.0686 0.0014 0.0200 0.0004 508 59.0 441 9.5 428 8.5 400 7.0 53 32.3 70.6 0.46 0.0911 0.0020 3.0355 0.0674 0.2417 0.0049 0.0650 0.0009 1448 42.2 1417 17.0 1396 25.2 1273 17.5 54 294 264 1.11 0.1261 0.0027 6.1906 0.1336 0.3562 0.0071 0.0903 0.0011 2044 37.9 2003 18.9 1964 33.8 1747 20.9 55 62.8 72.5 0.87 0.0876 0.0020 2.8016 0.0623 0.2319 0.0047 0.0617 0.0008 1374 42.6 1356 16.7 1344 24.3 1210 15.7 56 100 361 0.28 0.0794 0.0017 2.0770 0.0451 0.1897 0.0038 0.0507 0.0007 1182 42.6 1141 14.9 1120 20.5 1000 12.8 57 336 395 0.85 0.0556 0.0016 0.2855 0.0079 0.0373 0.0008 0.0102 0.0002 434 61.4 255 6.2 236 4.8 206 3.5 58 101 187 0.54 0.1076 0.0024 4.3664 0.0947 0.2942 0.0059 0.0766 0.0010 1760 39.4 1706 17.9 1663 29.2 1493 18.5 59 369 137 2.69 0.0580 0.0015 0.6697 0.0170 0.0838 0.0017 0.0222 0.0003 528 56.1 521 10.4 519 10.2 444 6.0 60 415 315 1.32 0.0580 0.0013 0.6695 0.0149 0.0837 0.0017 0.0219 0.0003 529 48.7 520 9.0 518 9.9 438 5.5 61 225 420 0.54 0.0651 0.0014 1.1479 0.0251 0.1279 0.0025 0.0349 0.0005 778 45.6 776 11.8 776 14.5 693 8.7 62 256 413 0.62 0.0562 0.0013 0.5285 0.0119 0.0682 0.0014 0.0191 0.0003 459 50.1 431 7.9 425 8.2 382 5.1 63 50.1 67.2 0.75 0.0654 0.0016 1.1580 0.0275 0.1285 0.0026 0.0348 0.0005 786 49.9 781 13.0 779 14.8 691 10.0 64 128 382 0.34 0.0574 0.0013 0.5420 0.0120 0.0684 0.0014 0.0198 0.0003 508 49.0 440 7.9 427 8.2 396 5.4 65 92.8 165 0.56 0.0753 0.0017 1.7575 0.0388 0.1693 0.0034 0.0439 0.0006 1077 44.2 1030 14.3 1008 18.6 869 11.2 66 105 129 0.81 0.0686 0.0016 1.2110 0.0282 0.1281 0.0026 0.0369 0.0005 886 48.1 806 13.0 777 14.7 733 10.1 67 104 128 0.81 0.0650 0.0015 1.1364 0.0262 0.1269 0.0025 0.0354 0.0005 774 48.4 771 12.4 770 14.6 702 9.6 68 92.5 186 0.50 0.1154 0.0025 5.2404 0.1135 0.3295 0.0065 0.0863 0.0011 1885 38.9 1859 18.5 1836 31.7 1673 20.5 69 100 154 0.65 0.0843 0.0019 2.4875 0.0545 0.2141 0.0043 0.0595 0.0008 1299 42.6 1268 15.9 1251 22.6 1167 14.7 70 53.2 132 0.40 0.0612 0.0016 0.8379 0.0212 0.0994 0.0020 0.0292 0.0006 645 54.7 618 11.7 611 11.9 582 10.9 71 183 190 0.96 0.0625 0.0015 1.1047 0.0261 0.1283 0.0026 0.0377 0.0005 690 50.5 756 12.6 778 14.7 748 10.3 72 551 497 1.11 0.0811 0.0018 2.1090 0.0463 0.1886 0.0038 0.0517 0.0007 1224 43.1 1152 15.1 1114 20.3 1019 12.6 73 168 336 0.50 0.1538 0.0034 7.6695 0.1655 0.3616 0.0072 0.0935 0.0012 2389 36.7 2193 19.4 1990 33.9 1807 21.7 74 253 365 0.69 0.1967 0.0043 13.6643 0.2949 0.5039 0.0100 0.1285 0.0016 2799 35.3 2727 20.4 2631 42.8 2444 29.0 75 145 47 3.10 0.0767 0.0022 1.8452 0.0502 0.1746 0.0037 0.0440 0.0006 1112 55.0 1062 17.9 1038 20.0 871 12.4 76 242 136 1.78 0.1687 0.0037 10.4455 0.2260 0.4490 0.0089 0.1147 0.0014 2545 36.3 2475 20.1 2391 39.6 2195 25.8 77 179 251 0.71 0.0666 0.0015 1.1687 0.0258 0.1273 0.0025 0.0355 0.0005 826 46.1 786 12.1 772 14.4 704 8.9 78 183 421 0.44 0.1087 0.0024 4.5255 0.0979 0.3021 0.0060 0.0816 0.0010 1777 39.5 1736 18.0 1702 29.6 1585 19.5 79 83.3 255 0.33 0.0568 0.0013 0.5393 0.0122 0.0689 0.0014 0.0196 0.0003 482 50.3 438 8.1 430 8.3 392 5.7 80 114 154 0.74 0.0736 0.0017 1.4169 0.0325 0.1396 0.0028 0.0398 0.0006 1031 46.6 896 13.7 843 15.8 790 10.9
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