Zircon U-Pb Age, Hf Isotope and Geological Significance of Early Cretaceous Monzodiorite in Liaodong Peninsula
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摘要: 为探讨辽东半岛中生代闪长岩类岩石成因及其形成构造背景，选取辽东半岛岫岩西南部黄岭岩体为研究对象，开展岩相学、锆石LA-ICP-MS U-Pb年代学、Hf同位素地球化学和岩石地球化学研究.结果表明：黄岭岩体由黑云母二长闪长岩组成；锆石LA-ICP-MS U-Pb年龄为127.4±1.9 Ma，成岩为早白垩世；岩石地球化学元素特征表明，黄岭黑云母二长闪长岩具高钾钙碱性，轻稀土元素富集，重稀土亏损，富集Rb、Zr、K等大离子亲石元素，亏损Nb、P、Ti等高场强元素，正Eu异常；εHf（t）值为－20.1~－18.0，二阶段Hf模式年龄TDM2为2 316~2 450 Ma，揭示二长闪长岩可能是古元古代古老地壳部分熔融形成.结合区域构造演化推测黄岭岩体形成于古太平洋板块向欧亚板块俯冲挤压后折返伸展的构造背景.Abstract: In order to determine the petrogenesis and tectonic setting of the Early Cretaceous biotite monzodiorite in Liaodong Peninsula,the lithology identification,zircon LA-ICP-MS U-Pb dating,major and trace elements,and Hf isotope data for the Huangling rock mass from southwest of Xiuyan are presented in this paper. The LA-ICP-MS U-Pb ages of the Huangling pluton of the monzodiorite is 127.4±1.9 Ma. The results of elemental and isotope geochemistry show that the Huangling monzodiorite belongs to high-K calc-alkaline series,and enriched in LREE and LILE (Rb,Zr,K),but depleted in HREE and HFSE (Nb,P,Ti) with positive Eu anomalies. The zircon εHf(t) values of the pluton range from -20.1 to -18.0,TDM2 ranges between 2 450 and 2 316 Ma,suggesting that the monzodiorite was mainly derived from the partial melting of the Paleoproterozoic crustal material. Combined with regional tectonic evolution,it is proposed that the Huangling monzodiorite diagenetic tectonic environment is the active continental margin,maybe formed in the extension tectonic environment,which is closely associated with the subduction of the Paleo-Pacific plate.
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Key words:
- zircon U-Pb /
- rare earth elements /
- geochemistry /
- Huangling pluton /
- Liaodong Peninsula
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图 2 辽东丹东黄岭岩体地质简图
Fig. 2. Simplified geological map of Huangling pluton, Dandong, Eastern Liaoning
图 3 辽东半岛丹东地区黑云母二长闪长岩手标本和镜下照片
a.岩石标本照片；b.显微镜下正交偏光照片；Q.石英；Pl.斜长石；Rh.角闪石；Bi.黑云母；Ks.钾长石
Fig. 3. Photogragh and microscope photogragh for biotite monzogranite rocks in Dandong, Liaodong Peninsula
图 4 辽东半岛岫岩地区黑云母二长闪长岩SiO2-Na2O+K2O图解（a）、SiO2-K2O (b)和A/CNK-A/NK图解（c）
a.据Le Maitre et al.（1989)；b.据Rickwood (1989); c.据Maniar and Piccoli (1989）
Fig. 4. Plots of SiO2-Na2O+K2O (a), SiO2-K2O (b) and A/CNK-A/NK (c) for biotite monzodiorite rocks in Xiuyan area, Liaodong Peninsula
图 5 辽东半岛岫岩地区黑云母二长闪长岩的稀土配分曲线（a）和微量蛛网图（b）
Fig. 5. Rare earth element distribution curves (a) and trace element spider diagram (b) for biotite monzodiorite rocks in Xiuyan area, Liaodong Peninsula
图 6 辽东半岛岫岩地区黑云母二长闪长岩锆石阴极发光(CL)图像
黄色圈为锆石U-Pb测定点；黑色点为Hf测试点
Fig. 6. Zircon CL image of biotite monzodiorite rocks in Xiuyan area, Liaodong Peninsula
图 7 辽东半岛岫岩地区黑云母二长闪长岩锆石LA-ICP-MS U-Pb年龄协和图（a）和加权平均年龄图（b）
Fig. 7. LA-ICP-MS U-Pb age of biotite monzodiorite rocks in Xiuyan area, Liaodong Peninsula
图 8 辽东半岛岫岩地区黑云母二长闪长岩的锆石Lu-Hf同位素特征图解
Fig. 8. Lu-Hf diagram of the biotite monzodiorite rocks of Dingqishan rocks in Xiuyan area, Liaodong Peninsula
图 9 辽东半岛黄岭岩体二长闪长岩构造环境判别图解
a. La/Yb-Ba/Nb判别图（据White and Patchett, 1984）；b. Ta/Yb-Th/Yb判别图（据Wood，1980）
Fig. 9. Discrimination diagrams for tectonic setting of biotite monzodiorite in Liaodong Peninsula
表 1 辽宁半岛岫岩黄岭黑云母二长闪长岩体的主量(%)、微量(10-6)元素分析结果
Table 1. Major (%) and trace (10-6) element concentrations of the biotite monzodiorite rocks from Xiuyan area, Liaodong Peninsula
样品 SiO2 TiO2 Al2O3 FeO Fe2O3 MnO MgO CaO Na2O K2O P2O5 ω(LOI) ω(SUM) Na2O+K2O A/CNK A/NK Rb Ga 18HL-1 54.715 1.117 20.312 4.816 0 2.128 8 0.103 1.957 5.457 0 4.974 0 2.816 0.340 0 0.79 99.52 7.79 0.96 1.81 79.3 25.9 18HL-2 56.549 0.939 20.273 4.214 0 1.836 7 0.086 1.523 4.773 0 5.317 0 2.879 0.270 0 0.95 99.61 8.20 0.99 1.71 81.5 24.0 18HL-3 56.377 0.968 20.203 4.402 7 1.791 1 0.091 1.600 4.800 0 5.219 0 2.830 0.280 0 0.93 99.49 8.05 0.99 1.73 82.4 26.2 18HL-4 55.880 1.004 18.893 4.950 7 1.565 1 0.108 2.407 5.434 0 4.244 0 3.207 0.367 0 1.31 99.37 7.45 0.93 1.81 120 26.0 18HL-5 55.078 1.005 19.805 4.838 4 2.094 4 0.096 2.200 5.431 5 4.698 5 2.973 0.373 5 1.07 99.66 7.67 0.95 1.81 81.0 25.8 样品 Ba Th U Nb Ta La Ce Pr Sr Nd Zr Hf Sm Eu Ti Gd Tb Dy 18HL-1 1 900 6.885 6 1.165 0 11.72 0.616 9 67.159 0 112.213 1 11.918 6 1 300 40.572 7 541.39 11.993 9 5.254 5 2.608 8 6 695 4.822 8 0.554 1 2.618 2 18HL-2 2 100 7.037 9 1.240 0 10.61 1.830 0 78.682 1 119.197 4 11.950 2 1 300 38.720 0 487.30 10.569 1 4.379 8 2.809 8 5 628 4.247 1 0.444 7 1.959 7 18HL-3 2 100 7.832 3 1.684 0 10.82 1.038 9 86.918 2 136.555 4 13.340 2 1 300 42.457 5 520.29 12.581 8 4.644 3 2.745 2 5 802 4.727 4 0.484 6 2.157 9 18HL-4 1 800 9.242 2 4.253 0 16.19 0.460 4 43.291 1 102.414 5 12.687 3 1 100 47.105 2 278.87 7.387 6 7.267 6 2.504 8 6 018 5.990 2 0.843 2 4.409 8 18HL-5 1 700 6.766 1 0.968 5 13.02 0.380 0 52.801 9 93.309 3 11.144 5 1 100 40.374 6 335.92 7.748 7 5.677 5 2.458 3 6 024 4.831 4 0.606 2 2.987 1 样品 Y Ho Er Tm Yb Lu Pb K P ΣREE LREE HREE LREE/HREE δEu δCe LaN/YbN 18HL-1 12.012 0 0.528 5 1.689 2 0.253 8 1.659 4 0.265 1 17.720 2 337 7 1 484 159.91 152.24 7.67 18.18 0.91 1.07 27.13 18HL-2 8.736 0 0.413 6 2.126 1 0.195 3 1.313 8 0.218 6 18.250 2 390 0 1 178 161.93 154.87 7.06 18.98 0.92 1.07 28.52 18HL-3 9.517 2 0.458 0 2.975 1 0.235 6 1.654 2 0.280 6 18.510 2 349 3 1 222 163.94 157.50 6.44 19.78 0.92 1.07 29.90 18HL-4 22.019 0 0.879 1 2.423 4 0.427 8 2.653 8 0.379 5 19.070 2 662 3 1 602 165.96 160.13 5.83 20.58 0.93 1.08 31.28 18HL-5 14.377 0 0.593 5 1.634 8 0.282 3 1.812 9 0.277 6 18.265 2 468 0 1 630 167.97 162.76 5.21 21.38 0.93 1.08 32.66 
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表 2 辽东半岛岫岩地区黄岭岩体中黑云母二长闪长岩锆石U-Pb分析结果
Table 2. Zircon U-Pb data of the biotite monzodiorite in Xiuyan area, Liaodong Peninsula
测试点号 元素(10-6) Th/U 同位素比值 年龄值(Ma) Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 206Pb/238U 1σ 207Pb/235U 1σ(%) 207Pb/206Pb 1σ(%) 18HLZ-01 1 011 598 1.69 0.051 4 0.002 5 0.143 8 0.006 6 0.020 4 0.000 3 136 5.884 874 261 112.945 0 130 1.745 006 18HLZ-02 1 044 627 1.67 0.046 7 0.002 0 0.125 5 0.005 2 0.019 4 0.000 2 120 4.726 456 31.6 99.990 0 124 1.219 671 18HLZ-03 1 181 767 1.54 0.047 4 0.001 8 0.132 4 0.005 0 0.020 3 0.000 2 126 4.442 277 77.9 75.920 0 129 1.318 884 18HLZ-04 483 378 1.28 0.048 9 0.002 7 0.132 8 0.006 9 0.019 9 0.000 2 127 6.167 568 146 162.015 0 127 1.556 909 18HLZ-05 252 315 0.80 0.048 1 0.002 8 0.130 4 0.007 8 0.019 5 0.000 2 124 6.964 949 102 129.610 0 124 1.531 710 18HLZ-06 1 164 797 1.46 0.048 6 0.002 0 0.137 4 0.005 7 0.020 5 0.000 2 131 5.085 386 128 99.985 0 131 1.424 820 18HLZ-07 769 536 1.43 0.048 7 0.002 1 0.135 5 0.006 0 0.020 2 0.000 2 129 5.377 254 132 99.060 0 129 1.526 889 18HLZ-08 89.3 135 0.66 0.046 5 0.004 2 0.124 7 0.010 4 0.019 3 0.000 4 119 9.377 040 33.4 199.970 0 123 2.389 870 18HLZ-09 378 424 0.89 0.053 8 0.002 7 0.144 5 0.007 0 0.019 5 0.000 2 137 6.252 107 365 108.322 5 125 1.424 726 18HLZ-10 203 273 0.74 0.049 7 0.002 9 0.132 4 0.006 7 0.019 4 0.000 3 126 6.020 744 189 135.167 5 124 1.634 726 18HLZ-11 1 009 648 1.56 0.048 0 0.001 8 0.138 3 0.005 0 0.021 0 0.000 2 132 4.419 168 98.2 87.027 5 134 1.477 764 18HLZ-12 187 272 0.69 0.049 3 0.003 1 0.133 9 0.008 1 0.019 8 0.000 3 128 7.265 798 161 -47.217 5 127 1.771 254 18HLZ-13 365 296 1.23 0.050 0 0.002 9 0.132 9 0.007 1 0.019 7 0.000 3 127 6.349 179 195 137.017 5 126 1.697 877 18HLZ-14 656 482 1.36 0.048 3 0.002 0 0.138 2 0.005 9 0.020 7 0.000 2 131 5.243 167 122 99.987 5 132 1.541 785 18HLZ-15 228 354 0.64 0.049 1 0.002 8 0.141 1 0.007 8 0.021 1 0.000 3 134 6.915 571 154 135.167 5 135 1.948 628 18HLZ-16 533 466 1.14 0.046 5 0.002 2 0.131 8 0.006 1 0.020 7 0.000 3 126 5.505 815 33.4 166.645 0 132 1.721 154 18HLZ-17 352 321 1.10 0.053 0 0.003 0 0.142 9 0.007 9 0.019 7 0.000 3 136 7.057 890 328 129.612 5 126 1.980 885 18HLZ-18 204 277 0.74 0.053 1 0.003 2 0.139 8 0.007 7 0.019 1 0.000 3 133 6.858 646 345 135.167 5 122 1.745 131 18HLZ-19 593 450 1.32 0.046 2 0.002 4 0.120 5 0.005 9 0.019 0 0.000 2 116 5.314 884 5.7 122.210 0 122 1.576 904 18HLZ-20 386 360 1.07 0.052 3 0.002 5 0.139 5 0.006 8 0.019 2 0.000 2 133 6.098 624 298 109.242 5 123 1.482 205 18HLZ-21 490 522 0.94 0.047 9 0.002 0 0.125 7 0.005 0 0.019 1 0.000 2 120 4.537 776 94.5 99.990 0 122 1.328 618 18HLZ-22 325 311 1.05 0.051 0 0.002 6 0.140 4 0.007 0 0.019 8 0.000 3 133 6.253 271 243 116.650 0 127 1.901 799 18HLZ-23 2 316 1 134 2.04 0.046 1 0.001 6 0.138 6 0.004 8 0.021 6 0.000 3 132 4.277 740 400 -316.625 0 138 1.699 279 18HLZ-24 404 403 1.00 0.049 5 0.002 6 0.143 9 0.007 2 0.021 1 0.000 3 137 6.352 482 172 122.205 0 135 1.771 823
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表 3 辽东半岛丹东地区黄岭岩体黑云母二长闪长岩锆石Lu⁃Hf分析结果
Table 3. Zircon Lu-Hf data of the biotite monzodiorite from Huangling pluton in Xiuyan area, Liaodong Peninsula
测试点 年龄（Ma） 176Yb/177Hf 2δ 176Lu/177Hf 2δ 176Hf/177Hf 2δ εHf(0) εHf(t) TDM1（Ma） TDM2（Ma） fLu/Hf SGL-1 130 0.054 399 0.000 959 0.001 596 0.000 019 0.282 167 0.000 012 -21.4 -18.7 1 553 2 365 -0.95 SGL-2 124 0.057 702 0.000 458 0.001 757 0.000 014 0.282 131 0.000 015 -22.7 -20.1 1 612 2 450 -0.95 SGL-3 129 0.073 682 0.000 557 0.002 104 0.000 016 0.282 170 0.000 015 -21.3 -18.6 1 571 2 362 -0.94 SGL-4 127 0.030 151 0.000 145 0.000 909 0.000 008 0.282 170 0.000 011 -21.3 -18.6 1 521 2 357 -0.97 SGL-5 124 0.030 753 0.000 354 0.000 930 0.000 013 0.282 189 0.000 011 -20.6 -18.0 1 495 2 316 -0.97 SGL-6 131 0.061 258 0.001 757 0.001 768 0.000 039 0.282 146 0.000 013 -22.1 -19.4 1 590 2 412 -0.95 SGL-7 129 0.073 866 0.001 909 0.002 097 0.000 044 0.282 186 0.000 014 -20.7 -18.1 1 547 2 326 -0.94 SGL-8 123 0.026 114 0.000 246 0.000 808 0.000 006 0.282 182 0.000 011 -20.9 -18.2 1 500 2 332 -0.98 SGL-9 125 0.042 381 0.000 740 0.001 260 0.000 019 0.282 179 0.000 012 -21.0 -18.3 1 522 2 340 -0.96 SGL-10 124 0.026 121 0.000 546 0.000 796 0.000 015 0.282 168 0.000 011 -21.4 -18.7 1 520 2 364 -0.98 SGL-11 134 0.049 895 0.000 331 0.001 455 0.000 012 0.282 149 0.000 014 -22.0 -19.2 1 573 2 402 -0.96 SGL-12 127 0.025 482 0.000 387 0.000 784 0.000 009 0.282 175 0.000 009 -21.1 -18.4 1 510 2 347 -0.98 SGL-13 126 0.056 471 0.000 577 0.001 695 0.000 021 0.282 164 0.000 012 -21.5 -18.9 1 562 2 375 -0.95 SGL-14 132 0.055 959 0.000 204 0.001 653 0.000 006 0.282 160 0.000 012 -21.7 -18.9 1 566 2 381 -0.95 SGL-15 135 0.044 412 0.000 536 0.001 322 0.000 010 0.282 167 0.000 015 -21.4 -18.6 1 542 2 361 -0.96 SGL-16 132 0.117 961 0.002 183 0.003 329 0.000 062 0.282 158 0.000 015 -21.7 -19.1 1 642 2 392 -0.90
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