Recognition of Late Neoproterozoic bimodal volcanic rocks from the Yaolinghe Formation in the Suizao terrane of South Qinling massif and constraints on the continental rifting of the northern margin of Yangtze craton
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摘要:
长期以来，扬子克拉通北缘新元古代地质构造演化一直是地学界研究的热点。在南秦岭随州地区耀岭河组中新识别出一套双峰式变火山岩，对其开展锆石U-Pb年代学研究结果表明，变玄武岩中锆石较少，且多为捕获锆石，年龄组成特征与下伏武当岩群顶部岩石中碎屑锆石基本一致；白云母千枚岩中锆石年龄集中，获得的U-Pb年龄为623±3 Ma，代表了南秦岭随枣地区耀岭河组的形成时代，该结果与侵入武当岩群中的基性岩墙年龄650~600 Ma一致，两者应为同时期不同产出相的岩浆作用的产物。结合区域研究成果，扬子克拉通北缘裂解可能经历了更长期且复杂的地质构造过程，西部裂解较早，东部（现今方向）较晚，总体呈"拉链式"裂解模式。
Abstract:Neoproterozoic tectonic evolution of the northern Yangtze craton is of great significance to the Precambrian geological evolution of South China.Zircon samples collected from the newly recognized bimodal meta-volcanic rocks of the Yaolinghe Formation in the Suizhou area were dated by LA-ICP-MS U-Pb method.Most zircons in the matabasalts are inherited zircons, their ages are consistent with those of detrital zircons from the underlying Wudang Formation in the region.Geochronological results also indicate that the muscovite-phyllites (felsic rocks) were formed at 623±3 Ma, representing the sedimentary age of the Yaolinghe Formation, synchronous with the 650-600 Ma intrusive sills in the Suizao terrane.Combined with the new geochronological data recording rifting-related magmatic-sedimentary rocks during the Late Neoproterozoic in the northern margin of the Yangtze craton, it can be advocated that the breakup of the Rodinia supercontinent in the northern part of the Yangtze craton might have been a long-lasting process.An oblique diachronous rifting model is further hypothesized for the breakup process.
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表 1 随枣地块耀岭河组白云母千枚岩LA-ICP-MS锆石U-Th-Pb同位素测试结果
Table 1. LA-ICP-MS zircon U-Th-Pb dating results from the muscovite-phyllite of the Yaolinghe Formation in the Suizao terrane
点号 元素/10-6 Th/U 同位素比值 表面年龄/Ma 谐和度 Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 17GC-11-01 242 250 0.97 0.05983 0.00083 0.83520 0.01428 0.10124 0.00133 598 30 616 8 622 8 99% 17GC-11-02 244 225 1.08 0.06306 0.00095 0.87453 0.01513 0.10056 0.00125 709 31 638 8 618 7 96% 17GC-11-03 135 178 0.76 0.06042 0.00089 0.83539 0.01423 0.10032 0.00128 618 31 617 8 616 7 99% 17GC-11-05 341 297 1.15 0.06260 0.00089 0.87015 0.01378 0.10075 0.00119 694 30 636 7 619 7 97% 17GC-11-06 159 179 0.88 0.06121 0.00101 0.86187 0.01464 0.10225 0.00133 656 37 631 8 628 8 99% 17GC-11-07 253 240 1.06 0.06329 0.00086 0.89117 0.01547 0.10195 0.00136 717 29 647 8 626 8 96% 17GC-11-08 165 224 0.74 0.06224 0.00071 0.85821 0.01160 0.09983 0.00112 683 24 629 6 613 7 97% 17GC-11-10 325 292 1.11 0.06262 0.00084 0.89443 0.01618 0.10325 0.00147 694 29 649 9 633 9 97% 17GC-11-11 160 192 0.83 0.06194 0.00090 0.87721 0.01389 0.10270 0.00137 672 31 639 8 630 8 98% 17GC-11-12 125 149 0.83 0.05960 0.00106 0.84735 0.01557 0.10324 0.00136 591 39 623 9 633 8 98% 17GC-11-13 198 236 0.84 0.06150 0.00088 0.86900 0.01594 0.10216 0.00122 657 27 635 9 627 7 98% 17GC-11-14 294 285 1.03 0.06060 0.00071 0.84505 0.01063 0.10130 0.00123 633 26 622 6 622 7 99% 17GC-11-15 104 140 0.74 0.06336 0.00091 0.89639 0.01498 0.10264 0.00123 720 25 650 8 630 7 96% 17GC-11-16 339 294 1.15 0.06137 0.00069 0.84974 0.01157 0.10049 0.00112 654 24 625 6 617 7 98% 17GC-11-17 302 250 1.21 0.06173 0.00084 0.84711 0.01383 0.09970 0.00128 665 30 623 8 613 8 98% 17GC-11-18 392 427 0.92 0.06216 0.00073 0.85267 0.01030 0.09993 0.00133 680 26 626 6 614 8 98% 17GC-11-19 300 271 1.11 0.06529 0.00112 0.92414 0.01631 0.10308 0.00132 783 37 665 9 632 8 95% 17GC-11-20 120 145 0.83 0.06299 0.00099 0.87753 0.01550 0.10109 0.00109 709 34 640 8 621 6 97% 17GC-11-22 313 300 1.04 0.06237 0.00081 0.87670 0.01493 0.10190 0.00120 687 32 639 8 626 7 97% 17GC-11-23 216 216 1.00 0.06167 0.00090 0.86816 0.01409 0.10234 0.00130 661 31 635 8 628 8 98% 17GC-11-25 228 259 0.88 0.06256 0.00099 0.86331 0.01536 0.10020 0.00123 694 34 632 8 616 7 97% 17GC-11-27 151 178 0.85 0.06054 0.00095 0.84546 0.01662 0.10129 0.00137 633 33 622 9 622 8 99% 
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表 2 随枣地块耀岭河组变玄武岩LA-ICP-MS锆石U-Th-Pb同位素测试结果
Table 2. LA-ICP-MS zircom U-Th-Pb analysis results from the metabasalt of the Yaolinghe Formation in the Suizao terrane
点号 元素/10-6 Th/U 同位素比值 表面年龄/Ma 谐和度 Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 17GC-13-01 97.6 58.9 1.66 0.07367 0.00203 1.33552 0.04012 0.13147 0.00200 1032 56 861 17 796 11 92% 17GC-13-02 214 345 0.62 0.20696 0.00191 15.9222 0.19504 0.55840 0.00603 2883 10 2872 12 2860 25 99% 17GC-13-03 146 164 0.89 0.06808 0.00103 1.21670 0.02150 0.13009 0.00189 872 31 808 10 788 11 97% 17GC-13-04 101 146 0.69 0.12448 0.00111 6.16464 0.08084 0.35935 0.00400 2021 17 1999 12 1979 19 98% 17GC-13-05 27.8 27.8 1.00 0.12484 0.01304 2.71459 0.43474 0.13303 0.00416 2028 191 1332 119 805 24 50% 17GC-13-06 164 232 0.71 0.11220 0.00105 5.00605 0.07068 0.32385 0.00399 1836 18 1820 12 1808 19 99% 17GC-13-07 191 176 1.08 0.06656 0.00088 1.14021 0.01572 0.12476 0.00165 833 27 773 7 758 9 98% 17GC-13-08 223 130 1.72 0.06619 0.00094 1.14075 0.01945 0.12505 0.00148 813 30 773 9 760 8 98% 17GC-13-09 150 151 1.00 0.07624 0.00645 0.66382 0.06970 0.05985 0.00096 1102 170 517 43 375 6 68% 17GC-13-10 40.8 41.7 0.98 0.06313 0.00153 1.07244 0.02693 0.12383 0.00219 722 52 740 13 753 13 98% 17GC-13-11 519 422 1.23 0.12868 0.00605 2.56614 0.28455 0.13325 0.00527 2080 83 1291 81 806 30 53% 17GC-13-12 63.2 116 0.55 0.18423 0.00187 12.5917 0.14965 0.49604 0.00610 2691 17 2650 11 2597 26 97% 17GC-13-13 50.9 61.5 0.83 0.16282 0.00162 10.2759 0.15144 0.45730 0.00605 2487 17 2460 14 2428 27 98% 17GC-13-14 1043 626 1.66 0.08597 0.00218 0.75286 0.01658 0.06408 0.00090 1339 50 570 10 400 5 65% 17GC-13-15 255 318 0.80 0.07046 0.00170 1.02346 0.02514 0.10640 0.00192 943 45 716 13 652 11 90% 17GC-13-16 50.7 88.5 0.57 0.06706 0.00124 1.13528 0.02557 0.12260 0.00171 839 161 770 12 746 10 96% 17GC-13-17 1004 744 1.35 0.07105 0.00341 0.65102 0.02996 0.06688 0.00073 959 98 509 18 417 4 80% 17GC-13-18 94.0 417 0.23 0.18636 0.00394 13.0734 1.79294 0.48566 0.05204 2710 36 2685 129 2552 22 94% 17GC-13-19 77.8 80.2 0.97 0.06736 0.00097 1.23889 0.02053 0.13304 0.00149 850 30 818 9 805 8 98% 17GC-13-20 133 214 0.62 0.17942 0.00207 9.97593 0.14193 0.40208 0.00455 2647 19 2433 13 2179 21 88%
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