ZIRCON U-Pb CHRONOLOGY OF THE HEILONGJIANG COMPLEX IN MUDANJIANG AREA: Geological Implication
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摘要:
黑龙江杂岩主要出露在佳木斯地块西缘,沿牡丹江断裂分布,为佳木斯地块与松嫩地块拼合过程中形成的构造混杂岩.杂岩以强烈变形的长英质糜棱岩为主体,其中含有大量具洋壳性质的超基性岩、变基性熔岩(蓝片岩)及变硅质岩和大理岩等岩块或岩片.对出露于黑龙江省东部牡丹江地区的长英质糜棱岩进行了锆石LA-ICP-MS研究.获得两组206Pb/238U年龄数据,其加权平均年龄分别为509.4±7.1 Ma(n=9,MSWD=1.3)和269±1.9 Ma(n=22,MSWD=0.93).其中最老2 420和2 459 Ma锆石年龄的出现,表明杂岩中有来自古元古界古老物质;509 Ma左右是佳木斯地块中麻山群的高级变质和花岗质岩浆作用年龄;约269 Ma年龄说明黑龙江杂岩变形基质形成于晚二叠世之后,可能与晚古生代古亚洲洋闭合事件相关.
Abstract:The Heilongjiang complex, mainly occurred in the western margin of Jiamusi massif along Mudanjiang fault, is a tectonic melange formed during the suturing of Jiamusi massif and Songnen massif. The complex is dominated by strongly deformed felsic mylonite, which contains a large number of ultrabasic rocks, metabasic lava (blueschist), meta-silicalite and marble blocks or slices with the nature of oceanic crust. The zircon LA-ICP-MS U-Pb dating of felsic mylonites in Mudanjiang area yields two groups of 206Pb/238U age data, with the weighted mean ages of 509.4±7.1 Ma (n=9, MSWD=1.3) and 269±1.9 Ma (n=22, MSWD=0.93). The zircons with the oldest ages of 2 420 and 2 459 Ma indicate that the complex contains ancient Paleoproterozoic materials. The age about 509 Ma is for advanced metamorphism and granitic magmatism of Mashan Group in Jiamusi massif. The age about 269 Ma suggests the deformed matrix of Heilongjiang complex be formed after Late Permian, which may be related to the closure of Paleo-Asian Ocean in Late Paleozoic.
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Key words:
- Heilongjiang complex /
- detrital zircon dating /
- Late Permian /
- Jiamusi massif /
- Mudanjiang area
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图 1 佳木斯地块和牡丹江地区黑龙江杂岩地质简图❶(据文献[18]修改)
Figure 1.
表 1 黑龙江杂岩样品(10MD-07)锆石LA-ICP-MS U-Pb年龄数据表
Table 1. Zircon LA-ICP-MS U-Pb dating data of Heilongjiang complex sample 10MD-07
测试点位 元素含量/10-6 Th/U 同位素比值 年龄/Ma Conc. Th U 207Pb*/206Pb* 1σ 207Pb*/235U 1σ 206Pb*/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 10MD-07-1-01 318.5 695.8 0.46 0.0535 0.0030 0.3211 0.0191 0.0426 0.0009 350 126 283 15 269 5 95% 10MD-07-1-02 277.8 468.4 0.59 0.0535 0.0027 0.3079 0.0151 0.0419 0.0006 346 113 273 12 264 4 96% 10MD-07-1-03 252.3 633.2 0.40 0.0508 0.0026 0.3015 0.0155 0.0427 0.0006 232 120 268 12 270 4 99% 10MD-07-1-04 295.0 719.7 0.41 0.0503 0.0022 0.3034 0.0135 0.0434 0.0007 209 102 269 11 274 4 98% 10MD-07-1-05 359.2 875.2 0.41 0.0546 0.0031 0.3273 0.0180 0.0431 0.0006 394 130 288 14 272 4 94% 10MD-07-1-06 621.0 1477.7 0.42 0.0565 0.0021 0.3447 0.0129 0.0435 0.0005 472 81 301 10 275 3 90% 10MD-07-1-07 137.7 267.4 0.51 0.1612 0.0041 9.6725 0.2787 0.4303 0.0082 2468 43 2404 27 2307 37 95% 10MD-07-1-08 144.7 300.0 0.48 0.1566 0.0036 9.7653 0.3024 0.4441 0.0093 2420 40 2413 29 2369 42 98% 10MD-07-1-09 542.5 2654.5 0.20 0.0559 0.0013 0.6534 0.0156 0.0837 0.0009 456 54 511 10 518 5 98% 10MD-07-1-10 104.5 2044.0 0.05 0.0569 0.0016 0.6630 0.0182 0.0834 0.0010 487 56 516 11 516 6 99% 10MD-07-1-11 73.2 608.3 0.12 0.0522 0.0053 0.3052 0.0336 0.0423 0.0021 295 233 270 26 267 13 98% 10MD-07-1-12 184.0 307.9 0.60 0.0495 0.0030 0.2940 0.0172 0.0431 0.0006 172 144 262 13 272 4 96% 10MD-07-1-13 167.4 1986.8 0.08 0.0881 0.0034 0.8096 0.0292 0.0665 0.0012 1384 74 602 16 415 7 63% 10MD-07-1-14 102.1 1020.2 0.10 0.0807 0.0027 0.8971 0.0281 0.0799 0.0009 1215 67 650 15 496 6 73% 10MD-07-1-15 173.1 825.8 0.21 0.0566 0.0052 0.3056 0.0279 0.0406 0.0028 476 236 271 22 257 17 94% 10MD-07-1-16 338.4 410.5 0.82 0.0514 0.0027 0.3027 0.0155 0.0428 0.0006 257 120 268 12 270 4 99% 10MD-07-1-17 261.1 766.0 0.34 0.0518 0.0019 0.3095 0.0134 0.0436 0.0011 280 85 274 10 275 7 99% 10MD-07-1-18 160.2 396.7 0.40 0.0475 0.0023 0.2825 0.0132 0.0431 0.0005 72 117 253 10 272 3 92% 10MD-07-1-19 184.8 672.6 0.27 0.0564 0.0077 0.4005 0.0559 0.0510 0.0016 478 307 342 41 321 10 93% 10MD-07-1-20 748.7 1544.9 0.48 0.0532 0.0017 0.3121 0.0102 0.0421 0.0005 339 38 276 8 266 3 96% 10MD-07-1-21 11.8 93.6 0.13 0.0702 0.0185 0.3320 0.0573 0.0399 0.0042 1000 532 291 44 252 26 85% 10MD-07-1-22 630.0 377.7 1.67 0.0520 0.0062 0.2874 0.0345 0.0402 0.0012 283 317 257 27 254 8 98% 10MD-07-1-23 104.1 154.7 0.67 0.0601 0.0058 0.3202 0.0287 0.0409 0.0011 609 211 282 22 258 7 91% 10MD-07-1-24 117.5 134.7 0.87 0.0581 0.0045 0.3306 0.0234 0.0432 0.0009 600 164 290 18 272 5 93% 10MD-07-1-25 812.9 2353.1 0.35 0.0584 0.0058 0.6445 0.0773 0.0791 0.0028 546 214 505 48 491 16 97% 10MD-07-1-26 1172.5 2750.8 0.43 0.0594 0.0016 0.6735 0.0210 0.0817 0.0015 583 57 523 13 506 9 96% 10MD-07-1-27 249.3 717.4 0.35 0.0593 0.0062 0.6581 0.0773 0.0797 0.0025 576 230 513 47 494 15 96% 10MD-07-1-28 136.8 370.6 0.37 0.0569 0.0022 0.6456 0.0254 0.0820 0.0011 487 87 506 16 508 6 99% 10MD-07-1-29 1.1 81.1 0.01 0.0627 0.0125 0.3079 0.0445 0.0411 0.0022 698 432 273 35 260 13 95% 10MD-07-1-30 276.8 1003.6 0.28 0.0571 0.0029 0.6315 0.0301 0.0798 0.0019 498 114 497 19 495 12 99% 10MD-07-1-32 36.8 87.1 0.42 0.0745 0.0040 0.5677 0.0309 0.0552 0.0011 1054 108 457 20 346 7 72% 10MD-07-1-35 3.8 173.6 0.02 0.0547 0.0104 0.3072 0.0619 0.0410 0.0018 467 309 272 48 259 11 95% 10MD-07-1-36 320.3 767.9 0.42 0.0552 0.0029 0.3324 0.0175 0.0428 0.0006 420 151 291 13 270 3 92% 10MD-07-1-37 265.8 255.3 1.04 0.0542 0.0034 0.3178 0.0192 0.0424 0.0007 389 145 280 15 268 4 95% 10MD-07-1-38 139.0 446.4 0.31 0.0613 0.0028 0.6892 0.0319 0.0805 0.0015 650 100 532 19 499 9 93% 10MD-07-1-39 197.9 305.7 0.65 0.0601 0.0059 0.6555 0.0567 0.0790 0.0031 606 208 512 35 490 18 95% 10MD-07-1-40 206.8 688.1 0.30 0.0539 0.0026 0.3189 0.0146 0.0431 0.0007 369 111 281 11 272 5 96% -
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