Zircon Ages of Paragneisses from the Sinh Quyen Formation in Northwestern Vietnam and Their Geological Significances
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摘要: 在大地构造位置上, 越南西北部地区是古特提斯造山带东段重要的组成部分, 并记录了印支陆块和华南板块碰撞拼合历史.其构造归属是厘定该地区古特提斯板块缝合带位置的关键.报道了出露的基底岩石Sinh Quyen岩组副片麻岩的碎屑锆石年龄, 探讨其沉积物源和归属问题.该岩组主要由长英质副片麻岩和混合岩等岩石类型构成, 被认为是越南西北部中元古代—古元古代基底岩石.采用LA-ICP-MS锆石U-Pb定年方法分析了3个长英质副片麻岩样品的116粒碎屑锆石.123个分析点锆石年龄的统计结果显示, 碎屑锆石形成时代主要集中在约1.8 Ga左右, 有少量约2.2~3.0 Ga中太古代碎屑锆石, 暗示Sinh Quyen副片麻岩沉积物源主要为早古元古代基底岩石.基底岩石在形成时间上与华南板块古老基底相似, 推断Sinh Quyen岩组在构造归属上可能来自华南板块.部分碎屑锆石边部记录约250 Ma变质增生作用, 可能与华南板块—印支板块的印支期拼合有关, 记录了古特提斯造山作用.Abstract: Northwestern Vietnam tectonically is an important part of the eastern Tethyan orogenic belt and this terrain has recorded the amalgamation history of the Indochina and South China blocks. Tectonic provenance of the terrain plays a key role for constraints on the location of the suture between these two blocks in NW Vietnam. In this study, detrital zircon ages of the Sinh Quyen Formation as part of the Paleo- to Meso-Proterozoic basement rocks in NW Vietnam are reported for discussion of sedimentary sources and tectonic province of the basement. The rock formation is composed mainly of felsic paragneiss and migmatite. One hundred and sixteen zircon grains separated from three felsic paragneiss samples were analyzed by the LA-ICP-MS U-Pb dating method. Results of a total of 123 analytical spots demonstrate that crystallization ages of the detrital zircons mainly cluster around ~1.8 Ga with minor ~2.2 Ga to ~3.0 Ga, indicating Paleoproterozoic basement rocks as major sedimentary sources of the Sinh Quyen Formation. Basement rocks in northwestern Vietnam are similar to old basements in South China in formation time and so it can be proposed that the Sinh Quyen Formation is of the South China affinity or originated from crustal material of the South China block. Part of detrital zircon grains record ~250 Ma metamorphic overgrowth in the rim, probably related to the collision of South China and Indochina blocks and therefore recording the paleo-Tethyan orogenic event.
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Key words:
- northern Vietnam /
- Tethyan orogenic belt /
- gneiss /
- Paleoproterozoic /
- zircon U-Pb age /
- geochronology
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图 1 东南亚构造简图(据Lepvrier et al., 2004修改)
Song Hong.红河断裂；Song Da.沱江(或黑水河)；SCF.兰江断裂；WCF.Wangchao断裂
Fig. 1. Tectonic sketch of southeastern Asia
图 2 Sinh Quyen岩组副片麻岩的显微结构
Kf.钾长石；Qz.石英；Pl.斜长石；Bi.黑云母；Ms.白云母；Si.夕线石；Zr.锆石
Fig. 2. Microstructure photographies of paragneisses from the Sinh Quyen Formation
图 3 Sinh Quyen岩组副片麻岩中代表性锆石的阴极发光图像(圆圈代表U-Pb年龄分析点)
Fig. 3. Cathodoluminescence images of typical zircon grains of paragneisses from the Sinh Quyen Formation
图 4 Sinh Quyen岩组长英质副片麻岩锆石U-Pb年龄
Fig. 4. Zircon U-Pb ages of felsic paragneisses from the Sinh Quyen Formation
表 1 Sinh Quyen岩组长英质副片麻岩锆石年龄
Table 1. Zircon ages of felsic paragneisses from the Sinh Quyen Formation
样品编号 Pb*(10-6) U(10-6) Th/U 同位素比值 表面年龄(Ma) 206Pb/238U 207Pb/235U 207Pb/206Pb 206Pb/238U 207Pb/235U 207Pb/206Pb V0759 01 631 1 119 0.50 0.476 8±50 11.13±12 0.169 4±17 2 513 2 534 2 552 02 242 671 0.31 0.303 8±32 4.675±49 0.111 6±11 1 710 1 763 1 826 03 252 709 0.29 0.301 2±32 4.615±49 0.111 1±11 1 697 1 752 1 818 04 168 455 0.31 0.312 1±33 4.785±51 0.111 2±11 1 751 1 782 1 819 05 220 404 0.25 0.450 2±47 9.791±104 0.157 8±16 2 396 2 415 2 432 06 250 442 0.08 0.477 7±50 11.73±12 0.178 1±18 2 517 2 583 2 635 07 262 452 0.07 0.489 9±52 12.17±14 0.180 2±19 2 570 2 618 2 655 08 235 1 040 0.94 0.251 7±30 3.342±93 0.096 3±29 1 447 1 491 1 554 09 159 394 0.59 0.314 5±35 4.866±81 0.112 2±22 1 763 1 796 1 835 10 83 216 0.57 0.296 5±33 4.337±77 0.106 1±22 1 674 1 700 1 733 11 329 587 0.38 0.448 6±47 9.888±103 0.159 9±16 2 389 2 424 2 454 12 462 1 135 0.65 0.317 0±33 4.914±51 0.112 4±11 1 775 1 805 1 839 13 423 2 191 0.12 0.167 2±17 3.018±32 0.130 9±20 996 1 412 2 110 14 182 450 0.75 0.310 0±32 4.810±51 0.112 6±12 1 740 1 787 1 841 15 240 462 0.33 0.449 3±48 9.906±109 0.159 9±17 2 392 2 426 2 455 16 129 141 1.82 0.548 3±58 15.53±168 0.205 4±22 2 818 2 848 2 870 17 337 1 036 1.16 0.297 9±31 4.702±52 0.114 5±12 1 681 1 768 1 871 18 416 1 034 0.70 0.309 0±32 4.819±50 0.113 1±11 1 736 1 788 1 850 19 199 519 0.41 0.310 9±33 4.869±70 0.113 6±20 1 745 1 797 1 858 20 433 1 712 0.16 0.220 3±33 3.348±38 0.110 2±17 1 283 1 492 1 803 21 350 1 020 0.80 0.247 2±28 3.301±73 0.096 8±24 1424 1 481 1 564 22 364 892 0.87 0.303 2±32 4.696±49 0.112 3±11 1 707 1 767 1 838 23 253 725 0.15 0.305 8±32 4.694±49 0.111 3±11 1 720 1 766 1 821 24 507 1 008 0.50 0.430 7±47 9.323±114 0.157 0±19 2 309 2 370 2 423 25 382 1 062 0.61 0.286 8±32 4.289±73 0.108 5±22 1 626 1 691 1 774 26 496 1 186 0.99 0.301 7±32 4.717±49 0.113 4±11 1 700 1 770 1 854 27 441 1 198 0.82 0.305 8±35 4.582±93 0.108 7±25 1 720 1 746 1 777 28 393 845 1.71 0.302 8±32 4.734±50 0.113 4±12 1 705 1 773 1 854 29 558 1 520 0.47 0.309 3±32 4.943±53 0.115 9±12 1 737 1 810 1 894 30 416 1 409 0.99 0.209 3±24 3.193±70 0.110 7±27 1 225 1 456 1 810 31 650 1 517 0.17 0.357 8±37 7.291±81 0.147 8±23 1 972 2 148 2 321 32 513 2 155 0.17 0.206 3±21 2.991±35 0.105 2±16 1 209 1 405 1 717 33 215 333 0.21 0.517 8±54 13.40±16 0.187 7±29 2 690 2 708 2 722 34 429 870 0.08 0.411 5±42 10.36±11 0.182 7±26 2 222 2 468 2 677 35 171 468 0.25 0.309 1±32 4.769±60 0.111 9±18 1 736 1 779 1 831 36 602 1 458 0.81 0.301 2±34 4.422±90 0.106 5±25 1 697 1 716 1 740 V0760 01 542 1 290 0.69 0.327 2±37 5.047±92 0.111 9±18 1 825 1 827 1 830 02 854 2 168 0.74 0.297 0±32 6.334±67 0.154 6±25 1 677 2 023 2 398 03 245 972 0.55 0.197 4±22 2.473±49 0.090 9±24 1 161 1 264 1 443 04 135 355 0.35 0.322 5±35 4.970±55 0.111 8±15 1 802 1 814 1 828 05 159 438 0.02 0.336 0±35 5.424±57 0.117 1±21 1 867 1 889 1 912 06 392 1 104 0.03 0.325 6±34 5.180±54 0.115 4±12 1 817 1 849 1 886 07 223 688 0.48 0.274 1±30 4.173±46 0.110 4±17 1 562 1 669 1 806 08 109 280 0.51 0.316 3±36 4.755±79 0.109 0±17 1 772 1 777 1 783 09 297 732 0.86 0.305 1±33 4.668±51 0.111 0±11 1 716 1 761 1 816 10 239 539 1.12 0.317 2±35 4.920±54 0.112 5±11 1 776 1 806 1 841 11 309 929 0.24 0.289 0±32 4.443±57 0.111 5±19 1 636 1 720 1 824 12 278 803 0.25 0.302 9±33 4.598±50 0.110 1±11 1 706 1 749 1 802 13 334 1 017 0.14 0.291 1±31 4.332±46 0.107 9±11 1 647 1 699 1 765 14 545 1 531 0.15 0.314 2±33 4.838±50 0.111 7±11 1 761 1 792 1 827 15 277 1 681 0.21 0.142 2±15 2.072±22 0.105 7±11 852 1 103 1 639 16 194 576 0.20 0.293 0±31 4.400±48 0.108 9±12 1 653 1 699 1 755 17 371 1 273 0.15 0.255 0±27 3.891±42 0.110 7±12 1 457 1 579 1 747 18 525 1 502 0.17 0.307 9±32 4.733±49 0.111 5±11 1 730 1 773 1 824 19 404 1 655 0.15 0.216 2±23 3.209±33 0.107 6±11 1 259 1 446 1 732 20 139 363 0.24 0.328 1±35 5.193±57 0.114 8±12 1 825 1 833 1 843 21 459 1 252 0.15 0.323 4±34 5.055±52 0.113 4±11 1 803 1 817 1 833 22 456 1 422 0.15 0.284 1±30 4.334±46 0.110 6±11 1 610 1 692 1 796 23 591 1 740 0.14 0.302 7±32 4.682±49 0.112 1±11 1 705 1 764 1 834 24 458 1 295 0.14 0.313 8±33 4.847±51 0.112 0±11 1 757 1 782 1 812 25 430 1 369 0.13 0.281 0±30 4.254±49 0.109 8±12 1 595 1 680 1 788 26 492 1 593 0.15 0.315 2±33 4.887±51 0.112 4±12 1 763 1 786 1 813 27 509 1 490 0.13 0.305 1±32 4.738±49 0.112 6±11 1 717 1 774 1 842 28 238 647 0.22 0.320 7±33 4.960±53 0.112 2±12 1 793 1 813 1 835 29 563 1 553 0.19 0.318 3±33 5.038±53 0.114 8±12 1 779 1 817 1 861 30 444 1 333 0.14 0.298 1±31 4.618±48 0.112 4±11 1 682 1 752 1 838 31 149 203 0.65 0.520 6±56 14.79±7 0.206 1±23 2 679 2 762 2 823 32 452 1 107 0.04 0.339 5±35 8.403±88 0.179 5±18 1 880 2 265 2 634 33 237 660 0.02 0.316 0±35 5.142±74 0.118 0±17 1 766 1 826 1 894 34 615 1 280 0.13 0.399 4±42 8.510±89 0.154 6±16 2 163 2 278 2 384 35 616 1 797 0.08 0.290 9±30 5.766±60 0.143 8±14 1 645 1 939 2 270 36 124 173 0.56 0.530 2±55 14.30±15 0.195 6±20 2 742 2 770 2 790 37 450 1 389 0.18 0.311 0±32 4.841±50 0.112 9±11 1 746 1 792 1 846 38 262 534 0.15 0.399 2±42 9.270±98 0.168 4±17 2 160 235 2 522 39 133 194 0.56 0.525 0±56 13.95±16 0.192 8±21 2 720 2 7461 2 766 40 226 408 0.15 0.454 1±48 10.09±11 0.161 1±17 2 412 2 439 2 462 41 160 248 0.31 0.494 7±52 12.95±14 0.189 8±20 2 582 2 657 2 716 42 185 302 0.17 0.491 0±51 11.93±12 0.176 0±18 2 572 2 591 2 606 43 763 2 626 0.21 0.232 7±24 5.073±52 0.158 2±16 1 342 1 807 2 397 44 46 59 0.61 0.556 9±77 15.98±32 0.208 0±42 2 854 2 875 2 890 45 356 1 039 0.16 0.286 9±30 4.593±49 0.116 1±12 1 617 1 710 1 826 46 587 1 333 0.52 0.037 2±04 0.537±06 0.104 8±11 1 789 1 814 1 866 47 445 1 707 0.25 0.215 8±22 3.281±34 0.110 3±11 1 260 1 477 1 804 48 541 1 448 0.15 0.314 6±33 4.889±51 0.112 7±12 1 758 1 777 1 801 49 426 1 716 0.23 0.269 8±28 4.380±49 0.117 7±13 1 522 1 630 1 773 50 460 1 243 0.13 0.312 8±33 4.941±54 0.114 5±12 1 750 1 791 1 839 51 414 980 0.87 0.313 8±33 4.797±50 0.110 9±11 1 759 1 784 1 814 52 540 1 334 0.74 0.307 0±32 4.759±51 0.112 4±12 1 719 1 751 1 789 53 164 471 0.01 0.316 9±33 4.954±53 0.113 4±12 1 775 18 119 1 852 54 319 517 0.14 0.508 7±54 13.44±15 0.191 6±24 2 646 2 702 2 744 55 336 925 0.03 0.325 4±34 5.250±54 0.117 0±12 1 808 1 829 1 852 56 183 333 0.23 0.455 8±48 10.06±11 0.160 1±16 2 421 2 441 2 457 57 333 595 0.36 0.453 3±47 9.936±102 0.159 0±16 2 410 2 429 2 445 58 312 1 383 0.05 0.277 4±29 4.150±49 0.108 5±13 1 576 1 656 1 758 59 69 88 0.49 0.589 9±63 18.45±20 0.226 9±24 2 989 3 014 3 030 60 641 1 058 1.03 0.434 7±45 8.939±92 0.149 2±15 2 327 2 332 2 336 61 98 112 1.16 0.549 6±58 15.39±17 0.203 1±22 2 823 2 839 2 851 62 268 689 0.49 0.318 4±33 4.968±54 0.113 2±12 1 782 1 814 1 851 63 225 543 0.25 0.509 8±69 15.20±29 0.216 3±42 2 656 2 828 2 954 64 74 122 0.54 0.464 1±49 12.19±14 0.190 5±21 2 458 2 619 2 746 65 25 29 0.81 0.542 7±59 15.03±18 0.200 9±24 2 795 2 817 2 834 66 286 582 0.73 0.433 4±45 8.983±92 0.150 3±15 2 321 2 336 2 350 67 288 562 0.10 0.460 7±48 11.54±12 0.181 7±19 2 443 2 568 2 668 68 458 967 0.33 0.391 9±40 7.822±80 0.144 8±15 2 125 2 191 2 254 69 183 478 0.16 0.412 4±43 8.085±88 0.142 2±15 2 226 2 241 2 254 70 43 60 1.01 0.550 2±68 15.38±20 0.202 7±27 2 826 2 839 2 848 V0753 01 76 420 0.03 0.039 5±4 0.341 0±41 0.062 5±8 250 298 691 02 186 348 0.35 0.404 4±42 7.772±80 0.139 4±14 2 189 2 205 2 220 03 326 629 0.36 0.406 6±43 7.870±84 0.140 4±15 2 199 2 216 2 232 04 10 190 0.04 0.039 9±4 0.285 0±61 0.051 8±11 252 255 278 05 31 577 0.02 0.039 4±4 0.279 0±40 0.051 4±7 249 250 260 06 81 174 1.43 0.321 1±36 5.085±77 0.114 9±17 1 795 1 834 1 878 07 18 94 0.52 0.147 4±16 1.592±23 0.078 3±11 876 876 876 08 38 235 0.01 0.038 4±4 0.275 0±4 0.051 9±7 243 246 283 09 11 235 0.53 0.040 1±4 0.287 0±6 0.051 9±11 253 256 282 10 54 132 0.51 0.317 9±34 4.937±57 0.112 7±13 1 774 1 789 1 805 11 5 110 0.04 0.039 9±5 0.278 0±8 0.050 6±15 252 249 222 12 14 133 0.58 0.083 7±9 0.677 0±12 0.058 6±10 518 525 553 13 12 104 0.58 0.083 9±9 0.701 0±14 0.060 6±12 520 539 624 14 33 208 0.67 0.123 6±13 1.131±15 0.066 3±9 751 768 817 15 109 244 0.47 0.355 6±38 6.007±67 0.122 5±13 1 961 1 977 1 993 16 72 127 0.86 0.405 4±43 7.817±86 0.139 8±15 2 194 2 210 2 225 17 183 332 0.60 0.416 8±44 8.226±89 0.143 1±15 2 246 2 256 2 266 
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