Petrogenesis of Late Cambrian granite in Luoguhe district of the northern Great Xing'an Range and its constrain on the tectonic evolution of the Xing-Meng Orogenic Belt
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摘要:
大兴安岭北段早古生代花岗岩主要分布于漠河—塔河一线。对漠河北部洛古河二长花岗岩开展岩石年代学与岩石地球化学研究。二长花岗岩中锆石为岩浆成因，LA-ICP-MS U-Pb测年表明，其形成时代为晚寒武世（486±3 Ma）。岩石具高硅（SiO2=62.75%~73.32%）、富碱（ALK=8.30%~9.45%）、高铝（Al2O3=13.97%~16.53%）、低镁、低钙和低钛的特点，铝饱和指数A/CNK为0.91~1.10，属偏铝质高钾钙碱性岩石系列。SiO2与Al2O3和P2O5具有较好的负相关性；富集Rb、Th、U、K、Zr、Hf等元素，而强烈亏损Ba、Nb、Ta、Sr、P、Ti等元素，球粒陨石标准化的稀土元素配分曲线图中呈轻稀土元素富集、重稀土元素亏损的右倾型配分模式，显示了Ⅰ型花岗岩特征。综合分析认为，洛古河岩体形成于西伯利亚板块南缘与额尔古纳等微陆块碰撞造山晚期由挤压体制向拉张体制转换的后碰撞构造环境。
Abstract:The Early Paleozoic granites in the northern part of the Great Xing'an Range are mainly distributed along the Mohe-Tahe.In this paper, geochronological and geochemical characteristics of the Luoguhe monzonite in the north of Mohe are studied.Zircons in the monzogranite is of magmatic origin, and LA-ICP-MS U-Pb dating indicates that it was formed in the Late Cambrian (486±3 Ma).The monzonite are characterized by high silicon (SiO2=62.75%~73.32%), rich alkali (AlK=8.30%~9.45%), high aluminum (Al2O3=13.97%~16.53%), low magnesium, low calcium and low titanium, with A/CNK value ranging from 0.91 to 1.10, indicating that monzonite belongs to aluminous and high potassium calc-alkaline rock series.The SiO2 content has a negative correlation with Al2O3 and P2O5.Rb, Th, U, K, Zr, Hf elements are enriched, while Ba, Nb, Ta, Sr, P and Ti are strongly depleted.In the chondrite normalized REE partition curves, LREE is enriched and HREE is depleted, which shows the characteristics of Ⅰ-type granites.Comprehensive analysis shows that the Luoguhe pluton was formed in a post-collisional tectonic setting during the late period of the orogeny between the southern margin of the Siberian plate and the Erguna micro landmass, which was transformed from compression system to extension system.
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图 1 大兴安岭北部大地构造分区图(a)和洛古河地区地质简图(b)(图a据冯志强等, 2019, 许文良等, 2019；图b据周传芳等, 2021修改)
Figure 1.
图 5 漠河地区晚寒武世二长花岗岩TAS图解(a)(底图据Middlemost, 1994)和SiO2-K2O图解(b)(底图据Peccerillo et al., 1976)
Figure 5.
图 6 漠河地区晚寒武世二长花岗岩稀土元素球粒陨石标准化配分图(a)和微量元素原始地幔标准化蛛网图(b)(球粒陨石标准化值据Boynton, 1984, 原始地幔标准化值据Sun et al., 1989)
Figure 6.
图 8 漠河地区晚寒武世二长花岗岩成因类型及构造环境判别图解(图a~c底图据Pearce et al., 1984；图d底图据Batchelor et al., 1985)
Figure 8.
表 1 漠河地区晚寒武世二长花岗岩LA-ICP-MS锆石U-Th-Pb同位素分析测定结果
Table 1. LA-ICP-MS zircon U-Th-Pb isotopic dating of Late Cambrian monzonite in Mohe area
测点号 含量/10-6 Th/U 同位素比值 年龄/Ma Pb U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 63 759 0.4702 0.0579 0.0008 0.6235 0.0096 0.0781 0.0009 526 29 492 8 485 6 2 150 1903 0.3478 0.0574 0.0007 0.6160 0.0087 0.0778 0.0009 509 26 487 7 483 6 3 100 1205 0.5142 0.0579 0.0007 0.6334 0.0088 0.0793 0.0009 526 26 498 7 492 5 4 73 894 0.4440 0.0574 0.0007 0.6214 0.0089 0.0785 0.0009 506 26 491 7 487 6 5 39 477 0.4439 0.0571 0.0008 0.6267 0.0103 0.0796 0.0009 496 31 494 8 494 5 6 60 723 0.4670 0.0572 0.0007 0.6286 0.0089 0.0797 0.0009 499 27 495 7 494 5 7 44 529 0.5219 0.0573 0.0009 0.6256 0.0106 0.0791 0.0008 504 34 493 8 491 5 8 55 696 0.4018 0.0578 0.0007 0.6153 0.0089 0.0772 0.0008 523 28 487 7 479 5 9 49 602 0.4582 0.0579 0.0007 0.6263 0.0088 0.0785 0.0008 525 27 494 7 487 5 10 38 466 0.3694 0.0571 0.0008 0.6218 0.0099 0.0789 0.0010 497 31 491 8 490 6 11 37 441 0.5023 0.0574 0.0008 0.6244 0.0101 0.0789 0.0009 507 32 493 8 490 6 12 33 410 0.3618 0.0575 0.0008 0.6249 0.0099 0.0788 0.0008 511 31 493 8 489 5 13 62 799 0.3391 0.0590 0.0007 0.6260 0.0089 0.0769 0.0008 569 26 494 7 478 5 14 81 1020 0.4156 0.0572 0.0007 0.6159 0.0083 0.0781 0.0008 499 26 487 7 485 5 15 72 910 0.4612 0.0580 0.0007 0.6108 0.0084 0.0764 0.0008 529 26 484 7 475 5 16 70 902 0.3773 0.0577 0.0007 0.6104 0.0085 0.0767 0.0008 518 26 484 7 477 5 17 33 421 0.3169 0.0588 0.0008 0.6277 0.0094 0.0774 0.0009 559 29 495 7 481 5 18 23 294 0.4108 0.0590 0.0009 0.6254 0.0107 0.0769 0.0008 567 34 493 8 477 5 19 59 716 0.5142 0.0574 0.0007 0.6329 0.0088 0.0799 0.0008 508 27 498 7 496 5 20 24 342 0.0628 0.0595 0.0010 0.6269 0.0129 0.0765 0.0009 584 38 494 10 475 5 21 39 515 0.2726 0.0597 0.0008 0.6243 0.0092 0.0759 0.0008 593 28 493 7 471 5 22 49 628 0.3550 0.0573 0.0007 0.6132 0.0087 0.0776 0.0008 504 28 486 7 482 5 23 50 630 0.3640 0.0583 0.0007 0.6243 0.0090 0.0777 0.0008 541 28 493 7 482 5 25 90 1027 0.8303 0.0584 0.0007 0.6368 0.0091 0.0790 0.0009 546 26 500 7 490 6 26 16 205 0.2837 0.0576 0.0011 0.6266 0.0129 0.0788 0.0008 516 42 494 10 489 5 27 22 282 0.3059 0.0570 0.0010 0.6322 0.0138 0.0804 0.0009 492 38 497 11 499 6 28 76 957 0.4114 0.0572 0.0007 0.6196 0.0083 0.0785 0.0008 501 26 490 7 487 5 29 44 555 0.3779 0.0569 0.0009 0.6272 0.0102 0.0800 0.0008 486 33 494 8 496 5 30 62 771 0.4031 0.0580 0.0007 0.6343 0.0087 0.0793 0.0009 531 26 499 7 492 5 31 27 346 0.3183 0.0575 0.0008 0.6223 0.0100 0.0785 0.0009 512 32 491 8 487 5 32 35 412 0.4161 0.0840 0.0012 0.9074 0.0137 0.0784 0.0008 1291 27 656 10 487 5 
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表 2 漠河地区晚寒武世二长花岗岩主量元素特征
Table 2. Major elements characteristics of Late Cambrian monzogranite in Mohe area
% 元素 WJL118花岗质初糜棱岩 WJL148二长花岗质初糜棱岩 WJL149花岗质初糜棱岩 WJL150二长花岗质初糜棱岩 WJL151花岗质糜棱岩 WJL180靡棱岩化中粒二长花岗岩 SiO2 62.75 73.32 72.87 64.97 64.07 72.18 Al2O3 16.34 13.97 14.26 15.62 16.53 14.44 TiO2 0.59 0.23 0.24 0.53 0.51 0.25 Fe2O3 2.10 0.59 0.68 1.67 1.64 0.56 FeO 4.15 1.22 1.25 3.62 3.62 1.51 CaO 2.76 1.08 1.09 2.83 2.46 1.17 MgO 0.62 0.37 0.41 0.54 0.55 0.57 K2O 5.63 5.09 4.73 5.46 5.78 4.69 Na2O 3.73 3.32 3.57 3.66 3.67 3.63 MnO 0.11 0.03 0.03 0.09 0.09 0.04 P2O5 0.16 0.05 0.05 0.15 0.13 0.07 灼失量 0.85 0.66 0.74 0.67 0.75 0.82 总和 99.78 99.92 99.92 99.80 99.80 99.92 K2O+Na2O 9.36 8.41 8.30 9.12 9.45 8.31 K2O/Na2O 1.51 1.53 1.33 1.49 1.57 1.29 TFeO 6.04 1.75 1.86 5.12 5.10 2.02 Mg# 17.71 30.72 31.61 18.11 18.44 37.18 A/CNK 0.95 1.08 1.10 0.91 0.99 1.10 σ 0.95 0.55 0.56 0.83 0.90 0.57 注：A/CNK=(Al2O3)/(CaO+K2O+Na2O)，摩尔数比；Mg#=100*Mg2+/(Mg2++Fe2++Fe3+)，离子摩尔数；σ=(Na2O+K2O)×2/(SiO2-43)，质量分数
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表 3 漠河地区晚寒武世二长花岗岩稀土和微量元素特征
Table 3. Chemical characteristics of rare earth elements and trace elements from Late Cambrian monzogranite in Mohe area
10-6 样品号 Y La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er WJL118 57.82 80.22 179.08 21.54 84.14 15.60 2.81 13.90 2.26 12.72 2.38 6.85 WJL148 28.10 50.94 102.96 13.11 49.09 8.94 0.85 7.24 1.08 5.59 0.99 2.88 WJL149 21.46 34.56 78.95 9.19 35.62 6.58 0.75 5.48 0.84 4.54 0.84 2.30 WJL150 56.98 80.21 169.14 20.77 79.78 14.45 2.58 12.54 1.95 11.28 2.09 6.11 WJL151 58.33 98.58 205.64 23.23 94.31 16.35 2.48 14.12 2.19 11.95 2.23 6.21 WJL180 36.05 23.58 75.59 6.30 25.48 5.67 0.49 5.14 1.00 6.71 1.41 4.17 样品号 Tm Yb Lu δEu ΣREE (La/Yb)N LREE/HREE Li Sc Ga Rb Sr WJL118 1.24 7.23 1.04 0.58 488.61 7.96 3.64 93.75 17.79 26.22 169.95 142.20 WJL148 0.50 2.94 0.43 0.32 275.64 12.42 4.54 43.50 3.79 20.44 150.98 129.96 WJL149 0.42 2.47 0.37 0.38 204.38 10.05 4.27 50.60 2.67 19.53 120.03 114.64 WJL150 1.12 6.43 0.95 0.59 466.33 8.95 3.69 39.61 18.41 25.79 167.16 159.22 WJL151 1.12 6.33 0.92 0.50 544.28 11.17 4.26 63.17 12.90 26.50 168.53 154.52 WJL180 0.79 4.54 0.60 0.28 197.52 3.73 2.27 90.14 3.64 23.59 221.90 105.79 样品号 Zr Nb Ba Hf Ni Cr V Ta Th U Ag 10000Ga/Al WJL118 596.09 18.94 962.70 15.45 1.80 2.71 12.70 1.22 21.07 4.13 0.04 3.03 WJL148 203.87 9.46 401.35 6.52 2.88 3.64 11.27 0.45 24.44 3.06 0.02 2.76 WJL149 186.32 9.37 337.48 6.33 3.49 4.01 9.57 0.52 19.08 3.46 0.02 2.58 WJL150 609.89 18.09 966.97 14.50 1.86 3.56 12.61 0.90 19.04 2.51 0.05 3.12 WJL151 580.33 18.29 909.98 14.04 5.38 5.16 13.67 1.01 24.62 3.95 0.03 3.03 WJL180 174.78 15.89 320.86 6.00 4.07 5.56 13.27 1.92 26.17 5.92 0.05 3.09 注：δEu=EuN/[(GdN+SmN)/2]
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表 4 大兴安岭北段漠河—塔河地区早古生代花岗岩特征
Table 4. Characteristics of Early Paleozoic granite for Mohe-Tahe district in Northern Great Xing'an Range
采样位置 岩性 测年方法 年龄/Ma 大地构造环境 资料来源 塔河地区 瓦拉干火山岩 玄武安山区 LA-ICP-MS 501.1±1.4 后碰撞造山环境 汪岩等, 2017 粗面玄武岩 500.5±0.95 壮志林场 花岗岩 LA-ICP-MS 488.9±2.6 后造山环境 杜兵盈等, 2019 塔河杂岩体 碱长花岗岩 LA-ICP-MS 492±5 后造山背景 葛文春等, 2005 正长花岗岩 494±9 正长花岗岩 485±6 辉长岩 490±3 二长花岗岩 485±3 永庆林场
(十八站岩体)斑状二长花岗岩 LA-ICP-MS 499±1 后造山或碰撞后造山环境 葛文春等, 2007 韩家园子南
(内河岩体)角闪花岗闪长岩 500±1 查拉班河 黑云母二长花岗岩 LA-ICP-MS 481±3 黑云母花岗闪长岩 475 ±2 465±1 白银纳西 黑云母花岗闪长岩 LA-ICP-MS 460±1 哈拉巴奇 二长花岗岩 LA-ICP-MS 500±2 后造山环境 隋振民等, 2006 黑云母花岗闪长岩 461±2 十八站-韩家园 二长闪长岩 LA-ICP-MS 512.4±3.5 活动大陆边缘/岛弧环境 柴明春等, 2018 漠河地区 漠河市西门都里 二长花岗岩 LA-ICP-MS 502.1±6.5 秦秀峰等, 2007 漠河漠北公路 黑云母二长花岗岩
(A型花岗岩)481±5 造山后伸展环境 吴琼等, 2019 漠河富源沟岩体 含电气石花岗岩
(S型花岗岩)458±4 同碰撞构造背景 段明新等, 2019 洛古河
(洛古河岩体)二长花岗岩 SHRIMP 504±8 后碰撞造山环境 武广等, 2005 石英闪长岩 517±9
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