Yanshanian metamorphism of Jiaodong Peninsula: New evidence from zircon and titanite U-Pb dating of (garnet) amphibolites in the Rushan area, Sulu tectonic complex belt
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摘要:
“燕山运动”泛指中国东部侏罗纪—白垩纪大规模构造运动，与之相关的构造作用及岩浆作用前人已有深入的研究，然而对于燕山运动相关变质作用却鲜有报道。通过对胶东半岛苏鲁构造杂岩带乳山地区（石榴）斜长角闪岩进行锆石及榍石U-Pb测年，发现念头石榴斜长角闪岩原岩时代为1708 Ma，变质时代为154 Ma；北庄斜长角闪岩早期变质时代为1840 Ma，晚期变质时代为145 Ma。综合上述年代学数据与近年有关胶东半岛燕山期构造-岩浆事件新进展，表明乳山地区（石榴）斜长角闪岩记录了燕山期变质作用，推测乳山地区燕山期变质作用发生于中国东部构造转换期（挤压到伸展），其成因可能与中国东部燕山造山过程中区域构造增厚作用有关，但目前不能排除该期变质作用可能与同期岩浆作用热驱动有关。
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关键词:
- 燕山运动 /
- 变质作用 /
- 锆石与榍石U-Pb定年 /
- 苏鲁构造杂岩带
Abstract:The "Yanshanian Movement" generally refers to the large-scale tectonic movement of the eastern China in Jurassic-Cretaceous.Its related structural and magmatic events have been deeply studied by previous researchers.However, a few Yanshanian metamorphic ages were reported previously in the eastern China.In this study, LA-ICP-MS U-Pb dating of zircons and titanite from the(garnet) amphibolites in Rushan region indicates that: (1) the formation age of the Niantou garnet amphibolites was 1708 Ma, and the metamorphic age was 154 Ma; (2) the early metamorphic age of the Beizhuang amphibolite was 1840 Ma, and the late metamorphic age was 145 Ma.On the basis of the above new zircon and titanite age and the new magmatic-tectonic data of the Jiaodong Peninsula, it is suggested that the garnet amphibolites of the Rushan region have ever recorded the Yanshanian metamorphic event, and it is speculated that the metamorphic event occurred in a special period of regional tectonic transformation stage(from compression to extension), and the origin of the metamorphism may be related to the regional tectonic thickening during the Yanshanian orogeny in eastern China, but at present it cannot be ruled out that the metamorphism of this period is possibly related to the thermal drive of magmatism at the same time.
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表 1 乳山地区镇念头石榴斜长角闪岩LA-ICP-MS锆石U-Th-Pb测试结果
Table 1. LA-ICP-MS U-Th-Pb dating results of magmatic zircons from the Niantou garnet amphibolite in the Rushan area
样品分析点 含量/10-6 Th/U 同位素比值 同位素年龄/Ma 谐和度 Commonpb Totalpb Th U 207pb/206pb lσ 207pb/235U lσ 206Pb/238U lσ 207pb/206pb lσ 207pb/235U lσ 206Pb/238U lσ 19TZH10-1-22 169.53 953.64 747.11 1447.69 0.52 0.1079 0.0022 4.6974 0.1350 0.3126 0.0053 1765 42 1767 24 1754 26 99% 19TZH10-1-10 254.35 2735.40 2913.94 2692.30 1.08 0.1059 0.0019 4.6027 0.0814 0.3137 0.0024 1729 32 1750 15 1759 12 99% 19TZH10-1-13 11.44 1290.18 1388.14 1551.56 0.89 0.1049 0.0018 4.3359 0.0764 0.2982 0.0022 1713 31 1700 15 1682 11 98% 19TZH10-1-02 66.88 11451.63 15810.62 8868.82 1.78 0.1048 0.0017 4.2355 0.0729 0.2912 0.0028 1711 29 1681 14 1648 14 98% 19TZH10-1-24 36.25 1102.31 1196.31 1268.37 0.94 0.1047 0.0019 4.3730 0.0824 0.3017 0.0022 1709 34 1707 16 1700 11 99% 19TZH10-1-11 26.39 928.40 944.74 933.18 1.01 0.1046 0.0019 4.6003 0.0879 0.3180 0.0035 1707 35 1749 16 1780 17 98% 19TZH10-1-19 43.28 1243.21 1328.84 1387.98 0.96 0.1043 0.0022 4.4193 0.0986 0.3059 0.0029 1702 39 1716 19 1720 14 99% 19TZH10-1-20 0.00 1113.48 1256.81 1223.24 1.03 0.1043 0.0022 4.3299 0.0930 0.2998 0.0023 1702 39 1699 18 1690 12 99% 19TZH10-1-1B 2.45 1327.93 1307.31 1621.15 0.81 0.1036 0.0022 4.3926 0.0962 0.3060 0.0027 1700 39 1711 18 1721 14 99% 19TZH10-1-04 45.35 6788.49 9107.51 6518.69 1.40 0.1036 0.0016 4.2505 0.0749 0.2957 0.0032 1700 28 1684 15 1670 16 99% 19TZH10-1-16 59.04 2980.62 3231.33 3700.83 0.87 0.1042 0.0019 3.9718 0.0735 0.2753 0.0021 1700 34 1628 15 1568 11 96% 19TZH10-1-0B 10.55 457.28 431.65 638.25 0.68 0.1041 0.0023 4.3579 0.0933 0.3023 0.0025 1698 41 1704 18 1703 13 99% 19TZH10-1-23 15.98 555.20 576.59 749.90 0.77 0.1040 0.0022 4.2531 0.0943 0.2951 0.0026 1698 39 1684 18 1667 13 98% 19TZH10-1—17 32.11 1344.13 1429.36 1765.74 0.81 0.1040 0.0021 4.1373 0.0840 0.2873 0.0024 1696 36 1662 17 1628 12 97% 19TZH10-1-21 13.92 1987.68 2135.00 2464.27 0.87 0.1038 0.0020 4.2025 0.0834 0.2925 0.0024 1694 36 1675 16 1654 12 98% 19TZH10-1-03 55.03 5306.66 5731.78 5967.90 0.96 0.1035 0.0016 4.2538 0.0653 0.2962 0.0023 1689 28 1684 13 1672 11 99% 19TZH10-1-25 14.77 804.12 877.97 961.23 0.91 0.1033 0.0019 4.2723 0.0795 0.2988 0.0023 1684 33 1688 15 1685 12 99% 19TZH10-1-07 14.86 2541.00 2849.57 2824.83 1.01 0.1031 0.0021 4.2557 0.0878 0.2978 0.0025 1681 38 1685 17 1680 13 99% 19TZH10-1-06 32.76 628.59 640.87 751.30 0.85 0.1024 0.0023 4.3748 0.1000 0.3083 0.0029 1678 42 1708 19 1732 14 98% 19TZH10-1-14 0.00 4828.21 5543.63 5497.82 1.01 0.1029 0.0017 4.1447 0.0733 0.2907 0.0026 1677 31 1663 15 1645 13 98% 19TZH10-1-12 1.60 1150.96 805.18 2221.89 0.36 0.1028 0.0017 4.0833 0.0677 0.2866 0.0019 1676 25 1651 14 1624 9 98% 19TZH10-1-09 24.61 1835.55 1943.51 2087.16 0.93 0.1028 0.0019 4.3688 0.0840 0.3065 0.0024 1676 35 1706 16 1724 12 99% 19TZH10-1-05 41.29 458.87 289.35 898.88 0.32 0.1011 0.0019 4.1547 0.0789 0.2961 0.0025 1656 34 1665 16 1672 12 99% 
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表 2 乳山地区念头石榴斜长角闪岩LA-ICP-MS榍石U-Th-Pb测试结果
Table 2. U-Th-Pb dating results of titanite from the Niantou garnet amphibolites in the Rushan
样品分析点 含量/10-6 Th/U 同位素比值 年龄/Ma pbTotal Th U 207pb/206pb lσ 207pb/235U lσ 206Pb/238U lσ 206Pb/238U lσ 207pb/235U lσ 19TZH10-1#5 243 30.00 19.50 1.54 0.449 0.02 3.76 0.19 0.06 0.0027 375 17 1574 41 19TZH10-1#18 264 43.10 24.20 1.78 0.427 0.016 2.99 0.13 0.0512 0.0021 321 13 1395 35 19TZH10-1#3 271 46.50 25.49 1.82 0.42 0.024 2.74 0.13 0.0493 0.0021 310 13 1355 39 19TZH10-1#10 288 43.40 22.77 1.91 0.446 0.021 3.21 0.15 0.0528 0.0022 332 14 1449 36 19TZH10-1#16 278 44.50 21.41 2.08 0.437 0.036 3.24 0.22 0.0546 0.0027 343 17 1458 54 19TZH10-1#21 282 47.40 22.37 2.12 0.428 0.027 3.15 0.18 0.0541 0.0029 339 18 1439 42 19TZH10-1#13 294 49.80 22.19 2.24 0.468 0.02 3.55 0.15 0.0558 0.002 350 12 1529 33 19TZHl0-l#19 284 51.90 22.51 2.31 0.438 0.023 3.22 0.15 0.0541 0.0025 340 15 1456 37 19TZH10-1#20 384 60.50 24.43 2.48 0.429 0.024 3 0.16 0.0508 0.0021 320 13 1400 40 19TZH10—1#2 273 50.60 19.61 2.58 0.46 0.025 3.7 0.18 0.0589 0.0022 369 13 1565 39 19TZH10-1#22 328 76.00 29.25 2.60 0.39 0.022 2.66 0.22 0.0478 0.0024 301 15 1305 59 19TZH10-1#7 290 62.70 23.80 2.63 0.421 0.019 2.92 0.13 0.0504 0.0018 317 11 1378 35 19TZH10-1#15 351 73.90 27.80 2.66 0.389 0.024 2.54 0.17 0.0462 0.0018 291 11 1274 46 19TZH10-1#17 355 75.30 27.30 2.76 0.409 0.018 2.77 0.13 0.0498 0.0021 313 13 1336 35 19TZH10—1#4 299 52.10 18.82 2.77 0.482 0.024 3.71 0.16 0.0565 0.0024 354 15 1568 33 19TZH10-#23 349 73.80 26.40 2.80 0.433 0.02 3.02 0.16 0.051 0.0025 321 15 1404 42 19TZH10—1#9 304 58.80 20.07 2.93 0.464 0.022 3.65 0.18 0.0571 0.0024 357 14 1550 40 19TZH10-1#14 294 40.90 13.57 3.01 0.553 0.023 6.08 0.26 0.0808 0.0031 500 18 1975 37 19TZH10-1#1 305 61.00 19.57 3.12 0.439 0.017 3.55 0.18 0.0583 0.0022 365 13 1530 40 19TZH10-#24 320 67.60 21.51 3.14 0.452 0.033 3.44 0.22 0.0559 0.0032 350 19 1506 51 19TZH10-1#30 274 60.80 19.27 3.16 0.447 0.02 3.39 0.14 0.0555 0.0017 348 10 1493 32 19TZH10-1#6 392 84.30 26.31 3.20 0.425 0.018 2.86 0.12 0.0498 0.0019 313 12 1372 33 19TZH10—1#28 353 110.10 31.40 3.51 0.363 0.015 2.21 0.1 0.0445 0.0013 280.5 8.3 1177 31 19TZH10-1#12 377 90.30 25.21 3.58 0.408 0.017 2.76 0.13 0.049 0.0018 308 11 1335 36 19TZH10-#27 347 96.20 26.80 3.59 0.411 0.019 2.68 0.12 0.0475 0.0015 299 9.3 1316 33 19TZH10-#25 366 117.60 31.20 3.77 0.369 0.014 2.29 0.1 0.0452 0.0017 285 11 1201 30 19TZH10—1#29 357 105.00 27.27 3.85 0.401 0.018 2.57 0.1 0.047 0.0015 295.8 9 1290 27 19TZH10-1#11 387 89.40 22.35 4.00 0.44 0.02 3.1 0.13 0.0514 0.0021 323 13 1425 32 19TZH10—1#8 292 72.30 16.50 4.38 0.487 0.028 4.03 0.22 0.0607 0.003 379 18 1632 44 19TZH10-#26 403 109.40 22.94 4.77 0.449 0.025 3.22 0.19 0.0525 0.0023 330 14 1453 46
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表 3 乳山地区北庄斜长角闪岩LA-ICP-MS锆石U-Th-Pb定年结果
Table 3. LA-ICP-MS U-Th-Pb dating results of zircons from the Beizhuang amphibolites in the Rushan
样品分析点 含量/10-6 Th/U 同位素比值 年龄/Ma 谐和度 Totalpb Th U 207pb/235U 2σ 206Pb/238U 2σ 207pb/206pb 2σ 207pb/235U 2σ 206Pb/238U 2σ 19LR44-2#33 78.9 127.5 1232 0.10 3.355 0.031 0.227 0.0022 1751 11 1493 7.1 1317 12 113.37 19LR44-2#30 26.7 42.7 355 0.12 3.993 0.049 0.261 0.0028 1805 16 1633 10 1494 14 109.3 19LR44—2#22 110.4 180.6 1168 0.15 3.64 0.035 0.239 0.0023 1802 10 1557 7.8 1380 12 112.86 19LR44-2#32 123.2 170.3 999 0.17 4.413 0.038 0.29 0.0027 1793 9.7 1714 7.2 1643 14 104.31 19LR44-2#1 251.2 309 1733 0.18 4.467 0.049 0.29 0.0036 1818 9.8 1724 9.3 1643 18 104.95 19LR44-2#7 100.1 133.8 755 0.18 4.254 0.043 0.279 0.0029 1802 12 1683 8.3 1587 14 106.07 19LR44-2#3 165.8 229 1224 0.19 3.38 0.047 0.225 0.0032 1772 13 1498 11 1308 17 114.53 19LR44—2#6 144.1 183 947 0.19 4.213 0.044 0.272 0.0027 1832 11 1675 8.6 1548 14 108.21 19LR44—2#20 63.3 113.1 593 0.19 2.795 0.054 0.191 0.0033 1726 20 1354 14 1127 18 120.14 19LR44-2#39 112.5 135.3 731 0.19 4.266 0.057 0.271 0.0037 1857 12 1685 11 1545 19 109.06 19LR44—2#8 121.8 159.4 720 0.22 4.555 0.046 0.295 0.0029 1827 10 1740 8.3 1664 15 104.56 19LR44-2#12 143.9 191.5 843 0.23 4.506 0.05 0.29 0.0028 1834 11 1732 9.4 1643 14 105.42 19LR44-2#15 47.9 59.4 248 0.24 5.268 0.056 0.332 0.003 1870 14 1862 8.9 1848 15 100.77 19LR44-2#16 34.4 48.6 204 0.24 4.816 0.059 0.307 0.0033 1851 17 1786 10 1726 16 103.48 19LR44—2#2 297.6 463.1 1805 0.26 3.385 0.031 0.226 0.0021 1766 9.1 1501 7.2 1315 11 114.14 19LR44-2#35 23.9 30.2 108 0.28 4.779 0.082 0.308 0.004 1831 25 1781 15 1731 20 102.89 19LR44—2#4 430 488.5 1675 0.29 4.778 0.052 0.31 0.0033 1817 10 1780 9.1 1742 16 102.16 19LR44—2#24 39.3 51.2 180 0.29 4.597 0.067 0.302 0.0038 1801 18 1748 12 1698 19 102.94 19LR44—2#26 72 104 314 0.33 4.387 0.053 0.284 0.003 1826 15 1708 9.9 1609 15 106.16 19LR44—2#23 49.1 63.9 177 0.36 4.722 0.06 0.305 0.0034 1825 17 1769 11 1715 17 103.15 19LR44—2#28 62.1 74.6 199 0.37 4.897 0.08 0.317 0.005 1826 17 1800 14 1772 25 101.58 19LR44—2#10 104.8 137 353 0.39 4.496 0.061 0.292 0.0037 1816 15 1728 11 1648 18 104.85 19LR44-2#19 162.2 215.3 511 0.42 4.798 0.054 0.309 0.0034 1840 12 1784 9.7 1733 17 102.95 19LR44-2#31 54.6 78 176 0.44 4.419 0.067 0.286 0.0041 1822 20 1713 13 1621 21 105.68 19LR44-2#21 99.8 128.5 276 0.47 4.721 0.05 0.31 0.0029 1805 14 1772 9 1737 14 101.99 19LR44—2#9 181.3 253.7 534 0.48 4.366 0.048 0.282 0.0032 1828 11 1704 9.1 1602 16 106.38 19LR44-2#10 21.9 30.39 63.7 0.48 4.436 0.072 0.29 0.004 1799 29 1716 13 1641 20 104.57 19LR44-2#14 13.7 18.38 38.4 0.48 4.51 0.11 0.294 0.005 1811 40 1725 20 1659 25 103.98 19LR44—2#29 650 903 1825 0.49 4.319 0.045 0.285 0.003 1791 9.5 1696 8.7 1616 15 104.93 19LR44-2#34 27.2 34.9 62.6 0.56 4.694 0.091 0.311 0.0046 1780 29 1763 16 1744 23 101.09 19LR44—2#25 11.B 14.23 23.9 0.60 5.26 0.15 0.339 0.0073 1815 48 1851 24 1879 35 98.51 19LR44-2#17 16.8 22.3 35.5 0.63 4.85 0.11 0.314 0.0057 1818 38 1786 19 1760 28 101.48 19LR44-2#38 29.8 46.1 72.9 0.63 3.758 0.093 0.248 0.0055 1795 41 1582 21 1427 28 110.86 19LR44-2#13 9.24 156.2 2290 0.07 0.144 0.003 0.021 0.0004 165 32 137 2.9 135 2.6 101.71 19LR44-2#18 10.33 170.9 1805 0.09 0.153 0.002 0.023 0.0002 158 31 145 2 144 1.5 100.91
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