PROTOLITH RECONSTRUCTION AND GEOTECTONIC ENVIRONMENTAL RESEARCH OF XINGHUADUKOU ROCK GROUP IN LVLIN FORESTRY CENTER, DAXING'ANLING
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摘要: 兴华渡口岩群作为额尔古纳地块的基底，其变质年龄、原岩类型及大地构造背景一直是地质学家关注的热点。以大兴安岭北段绿林林场一带兴华渡口岩群作为研究对象，利用锆石U-Pb同位素测年限定了原岩的变质时代，结合岩相学与地球化学综合分析方法开展原岩恢复，并进一步讨论了其形成的大地构造背景。研究认为兴华渡口岩群主要由斜长角闪岩类、浅粒岩类、变粒岩类和石英岩类组成；斜长角闪岩类原岩为基性火山岩，浅粒岩类原岩为英安质凝灰岩，石英岩和变粒岩原岩为泥质粉砂岩；斜长角闪岩类亏损非活动性微量元素Ta、Nd、P，大地构造环境属岛弧环境；浅粒岩类主要亏损Ta、Nd、P、Sr、Ti等元素，形成于大陆边缘造山带环境。绿林林场一带兴华渡口岩群的变质年龄下限为774.1±3.8 Ma。Abstract: Xinghuadukou Rock Group, as the basement of Ergun massif, its metamorphic age, protolith types and geotectonic setting has always been a hot spot for geologists. With Xinghuadukou Rock Group in lvlin forestry center, north part of Daxing'anling, as the research object, zircons U-Pb isotopic dating was used to define the metamorphic age of protolith. Protolith reconstruction was carried out combining with the comprehensive analysis methods of petrography and geochemistry, and its geotectonic setting was further discussed. The resarch suggests that Xinghuadukou Rock Group is mainly composed of amphibolite, leptite, granulite and quartzite. The protolith of these four kinds respectively are basic volcanic rock, dacite tuff, pelitic siltstone and pelitic siltstone. Amphibolite is lack of non-active trace elements Ta、Nd、P, and it belongs to the island-arc geotectonic environment. Leptite mainly lacks Ta、Nd、P、Sr、Ti and other elements, and it is formed in the orogenic belt environment of continental margin. The lower limit of metamorphic age of Xinghuadukou Rock Group in Lvlin forestry center is 774.1±3.8 Ma.
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Key words:
- Daxing'anling /
- Xinghuadukou Rock Group /
- metamorphic age /
- protolith reconstruction /
- geotectonics
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图 2 细粒斑状含黑云二长花岗岩锆石CL图像特征(白色实线圈为年龄测点位置)
Figure 2. CL image features of zircons in fine-grained biotite adamellite (White solid coils are the age measuring positions)
图 3 细粒斑状含黑云二长花岗岩锆石U-Pb年龄谐和图
Figure 3. Concordia plot of zircon U-Pb age in fine-grained biotite adamellite
图 4 稀土元素/球粒陨石标准化分布形式图
Figure 4. standardized distribution pattern of rare earth elements and chondrites
图 5 微量元素/球粒陨石标准化蛛网图
Figure 5. Standardized spider diagram of trace elements and chondrite
图 6 五大化学类型变质岩和主要造岩矿物在ACF图和A′KF图上的位置[19]
1—泥质(Al2O3过剩)；2—长英质和泥质(K2O过剩)；3—钙质；4—基性；5—镁质；Act—阳起石；Andr—钙铁榴石；Jed—铝直闪石；Lm—浊沸石；Lw—硬柱石；Mar—珍珠云母；Mgn—菱镁矿；Opx—斜方辉石；Prh—葡萄石；Prl—叶蜡石；Pu—绿纤石；Pyr—镁铝榴石；Sca—方柱石；Ves—符山石；Zo—黝帘石；Ms—白云母；Bi—黑云母; Cc—方解石；Wo—硅灰石；Dol—白云石；Di—透辉石；Tr—透闪石；Ser—绢云母；Tc—滑石；Ant—直闪石；Cum—镁铁闪石；Brc—水镁石；Alm—铁铝榴石；Ch—绿泥石；Cld—硬绿泥石；Crd—堇青石；St—十字石；Als—Al2SiO5矿物；An—钙长石；Stp—黑硬绿泥石；Kf—钾长石；Ep—绿帘石；Gro—钙铝榴石
Figure 6. Positions of five major metamorphic rocks of chemical types and the main rock-forming minerals in Pictures ACF and A′KF[19]
表 1 细粒斑状含黑云二长花岗岩锆石LA-ICP-MS分析结果
Table 1. The zircon LA-ICP-MS analysis results of fine-grained biotite adamellite
测点 Pb U 206Pb/238U 207Pb/235U 207Pb/206Pb (206Pb/238U)/
Ma(207Pb/235U)/
Ma(207Pb/206Pb)/
Ma/×10-6 1 98 673 0.1276 1.1506 0.0654 774.03 777.51 787.04 2 41 276 0.1271 1.1679 0.0668 771.47 785.67 831.48 3 139 1283 0.0964 0.8602 0.0646 593.04 630.24 761.12 4 54 364 0.1269 1.1380 0.0648 770.24 771.54 768.52 5 63 422 0.1278 1.1787 0.0669 775.42 790.71 835.18 6 68 449 0.1274 1.1852 0.0674 772.79 793.71 851.54 7 82 544 0.1286 1.1468 0.0647 779.80 775.73 764.82 8 138 1146 0.1038 0.9648 0.0675 636.53 685.78 853.70 9 99 668 0.1274 1.1638 0.0662 773.04 783.72 812.96 10 78 553 0.1286 1.1988 0.0676 779.75 800.03 857.40 11 94 593 0.1272 1.1714 0.0668 771.70 787.29 831.48 12 81 542 0.1266 1.1461 0.0657 768.39 775.38 795.99 13 104 697 0.1154 1.0192 0.0641 704.18 713.53 744.14 14 49 368 0.1157 1.0979 0.0687 705.78 752.31 888.58 15 74 473 0.1358 1.3157 0.0697 820.66 852.63 920.37 16 86 538 0.1387 1.2450 0.0653 837.12 821.15 783.34 17 129 1201 0.0976 0.8581 0.0638 600.29 629.11 744.45 18 62 407 0.1270 1.2126 0.0691 771.01 806.39 901.85 19 77 499 0.1277 1.1784 0.0667 774.70 790.56 827.78 20 70 469 0.1280 1.2004 0.0677 776.73 800.76 861.11 21 181 1409 0.1127 1.0357 0.0662 688.14 721.77 812.96 22 131 1040 0.1131 1.0353 0.0660 690.93 721.60 805.56 23 92 614 0.1280 1.1972 0.0675 776.63 799.31 853.70 24 53 352 0.1282 1.1511 0.0650 777.60 777.74 772.23 
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表 2 兴华渡口岩群岩石主量元素特征数据表
Table 2. Characteristic data table of major elements in rocks of Xinghuadukou Rock group
序号 时代 岩性 样号 氧化物含量/% SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 烧失量 ∑ 1 中元古代 斜长角闪岩 PM13YQ5 51.72 1.01 10.51 1.47 7.08 0.14 12.97 8.47 2.39 1.14 0.18 2.69 99.79 2 石英岩 PM13YQ6 93.46 0.09 1.30 2.88 0.87 0.11 0.11 0.06 0.03 0.29 0.023 0.77 99.99 3 黑云石英岩 PM13YQ9 87.32 0.30 4.61 2.03 1.88 0.036 0.87 0.08 0.14 0.80 0.045 1.85 99.96 4 二长浅粒岩 PM06YQ1 64.74 0.70 17.36 1.68 1.12 0.091 0.66 1.24 5.27 6.23 0.18 0.55 99.82 5 二长浅粒岩 PM06YQ2 72.84 0.29 13.71 1.27 1.42 0.048 0.27 0.91 3.56 4.03 0.15 1.20 99.70 6 二长浅粒岩 PM06YQ6 72.13 0.32 13.38 1.08 2.12 0.086 0.49 0.71 2.97 5.15 0.10 1.12 99.66 均值 69.90 0.44 14.82 1.35 1.55 0.070 0.47 0.95 3.93 5.14 0.14 0.96 99.73 7 黑云斜长变粒岩 PM06YQ4 68.39 1.22 15.33 0.98 4.05 0.089 1.63 0.53 0.55 4.50 0.086 2.48 99.84 8 变粒岩 PM06YQ5 60.97 0.97 20.73 1.95 4.75 0.062 1.21 0.11 0.29 4.68 0.11 4.01 99.84 9 变粒岩 PM13YQ7 60.85 1.05 17.82 1.37 4.83 0.10 2.53 3.19 3.09 2.86 0.17 1.87 99.74 均值 63.40 1.08 17.96 1.44 4.54 0.08 1.79 1.27 1.31 4.02 0.12 2.79 99.81
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表 3 研究区兴华渡口岩群稀土元素含量及特征参数表
Table 3. The content of rare earth elements and the characteristic parameters of Xinghuadukou Rock group in the study area
序号 样号 稀土元素含量/×10-6 特征参数值 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ΣREE LREE HREE LR/HR δEu δCe (La/Yb)N (Ce/Yb)N (Sm/Eu)N 1 PM13YQ5 24.3 45.6 6.31 26.0 4.99 1.51 3.91 0.59 3.13 0.53 1.48 0.21 1.28 0.20 14.4 134.37 108.63 11.33 9.59 1.01 0.87 12.82 9.24 1.25 基性(维) 27 4.5 4 20 5 1 5 0.8 1 2 0.2 2 0.6 20 2 PM13YQ6 9.23 23.0 2.38 9.59 1.77 0.29 1.46 0.23 1.28 0.23 0.66 0.10 0.63 0.10 5.64 56.61 46.3 4.68 9.9 0.54 1.16 9.92 9.51 2.28 3 PM13YQ9 15.0 28.4 3.42 12.9 2.66 0.46 2.41 0.41 2.47 0.44 1.22 0.19 1.20 0.19 11.9 83.23 62.86 8.52 7.38 0.55 0.92 8.46 6.13 2.18 4 PM06YQ1 84.2 163 18.9 70.0 10.1 2.05 8.61 1.04 4.55 0.80 2.27 0.31 2.01 0.34 22.4 390.27 347.93 19.93 17.46 0.66 0.94 28.26 20.95 1.86 5 PM06YQ2 44.3 90.3 8.32 32.7 6.43 2.06 6.13 1.08 6.85 1.43 4.15 0.71 4.61 0.75 40.6 250.47 184.1 25.72 7.16 0.99 1.06 6.47 5.07 1.18 6 PM06YQ6 75.2 137 17.4 70.4 13.3 3.04 12.1 1.97 11.0 2.21 6.20 0.95 5.78 0.97 50.8 408.12 316.13 41.18 7.68 0.72 0.88 8.77 6.12 1.64 均值 67.9 129. 14.9 57.7 9.9 2.4 9.0 1.4 7.5 1.5 4.2 0.7 4.1 0.7 38.0 349.62 282.72 28.94 10.77 0.79 0.96 14.50 10.71 1.56 酸性(维) 60 100 12 46 9 1.5 9 2.5 2 4 0.3 4 1 34 7 PM06YQ4 50.4 103 12.4 48.6 8.91 1.13 7.77 1.20 6.37 1.21 3.26 0.48 3.00 0.50 35.3 283.91 224.79 23.78 9.45 0.41 0.97 11.31 8.91 2.98 8 PM06YQ5 64.2 130 15.6 60.3 10.9 1.60 9.05 1.36 6.57 1.17 3.14 0.46 2.83 0.46 31.8 339.88 283.07 25.03 11.31 0.48 0.96 15.28 11.91 2.58 9 PM13YQ7 40.0 83.3 10.7 39.3 6.48 1.90 5.14 0.71 3.59 0.63 1.83 0.27 1.75 0.29 16.7 212.54 181.64 14.21 12.78 0.98 0.95 15.42 12.33 1.28 均值 51.5 105 12.9 49.4 8.78 1.54 7.32 1.09 5.51 1.00 2.74 0.40 2.53 0.42 27.9 278.78 229.83 21.01 11.18 0.62 0.96 14.00 11.05 2.28 页岩+粘土岩(维) 40 50 5 23 6.5 1 6.5 0.9 － 1 2.5 0.25 3 0.7 30
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表 4 研究区兴华渡口岩群微量元素含量及特征参数表
Table 4. The content of trace elements and characteristic parameters of Xinghuadukou Rock group in the study area
序号 样号 微量元素含量/×10-6 特征参数值 Ba Rb Th K Nb Ta Sr Zr Hf Ti Cr Co Ni V U Rb/Sr Zr/Hf K/Rb Nb/Ta 1 PM13YQ5 495 32.5 4.03 9481 6.75 0.42 500 114 3.76 6034 500 53.2 159 164 0.78 0.07 30.5 290 15.7 基性(维) 300 45 3 8300 20 0.48 440 100 1 9000 200 45 160 200 0.5 0.10 100 184 41.7 2 PM13YQ6 30.5 13.9 1.42 2377 1.98 0.14 6.99 29.7 0.881 541 18.9 7.69 9.89 9.80 0.75 1.99 338 170 13.8 3 PM13YQ9 117 31.7 4.58 6619 7.54 0.49 10.9 114 3.78 1775 30.9 9.50 21.8 19.8 1.38 2.91 30.3 208 15.1 4 PM06YQ1 677 102 8.84 51720 16.9 0.87 125 569 12.2 4203 3.33 1.59 1.81 24.5 1.68 0.82 46.6 505 19.3 5 PM06YQ2 1693 120 13.1 33493 20.1 1.30 149 428 12.1 1754 5.78 1.15 1.98 8.18 3.23 0.80 35.3 278 15.4 6 PM06YQ6 1974 132 17.9 42781 18.2 1.17 148 452 12.2 1936 6.42 1.65 1.03 14.0 3.27 0.89 37.0 322 15.5 均值 14488 118 13.3 42664 18.4 1.12 141 483 12.2 2631 5.18 1.46 1.61 15.6 2.73 0.84 39.6 360 16.5 酸性(维) 830 200 18 33400 20 3.5 300 200 1 2300 25 5 8 40 3.5 0.67 200 167 5.71 7 PM06YQ4 547 214 17.2 37372 24.6 1.52 42.9 356 10.6 7316 94.1 18.2 33.1 137 1.84 5.01 33.4 173 16.2 8 PM06YQ5 806 200 23.1 38868 19.6 1.39 49.6 233 7.31 5840 90.0 6.10 28.9 129 3.56 4.04 31.9 193 14.1 9 PM13YQ7 1177 93.8 11.8 23755 15.8 0.72 567 226 6.36 6303 65.6 17.4 23.0 118 1.33 0.17 35.4 253 21.7 均值 843 169 17.3 33331 20.0 1.21 219 272 8.11 6486 83.2 13.9 28.33 128 2.25 0.77 33.5 196 16.5 页岩+粘土岩(维) 800 200 11 22800 20 3.5 450 200 6 4500 100 20 95 130 3.2 0.44 33.3 114 5.71
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