LA-ICP-MS zircon U-Pb age and geochemical characteristics of Neoarchaean metamorphic plutonic rocks in Kaiyuan area of northern Liaoning Province
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摘要:
辽北开原地区新太古代变质深成岩位于华北板块北缘陆缘活动带东段，主要岩性为二长花岗质片麻岩、花岗闪长质片麻岩和英云闪长质片麻岩，其中英云闪长质片麻岩LA-ICP-MS锆石207Pb/206Pb年龄加权平均值为2489.6±9.1 Ma，为新太古代。新太古代变质深成岩属高钾钙碱性-钾玄岩，准铝-过铝质岩石系列，轻稀土元素较富集，重稀土元素相对亏损，具有下地壳或太古宙沉积岩部分熔融形成的特征。通过岩石学、岩石地球化学和构造环境及就位机制分析，结合邻区构造演化研究，认为辽北开原地区变质深成岩岩浆来自较浅的基性古陆壳局部熔融。大地构造位置可能处在洋壳与陆壳的接触带，说明新太古代清河断裂附近可能出现陆壳碰撞增生活动。闪长质-石英闪长质-花岗闪长质-二长花岗质片麻岩体现了陆壳经历长时间的增生、造陆活动，已由早期的基性陆壳向现今的硅铝质陆壳转变。
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关键词:
- 新太古代 /
- 片麻岩 /
- LA-ICP-MS锆石U-Pb年龄 /
- 辽北开原 /
- 华北板块
Abstract:Located in the Kaiyuan area of northern Liaoning Province on the northern margin of North China, the Neoarchaean metamorphic plutonic rocks are mainly composed of monzonitic granitic gneiss, granodioritic gneiss and quartz dioritic gneiss.According to LA-ICP-MS zircon U-Pb dating, they were formed in Neoarchaean, with the 207Pb/206Pb age of 2489.6±9.1 Ma.Neoarchean metamorphic plutonic rocks belong to high-K calc-alkaline-potassium basalt, quasi-aluminium-peraluminous rock series, and are enriched in LREE and relatively depleted in HREE, characterized by partial melting of the lower crust or Archean sedimentary rocks.Based on an analysis of petrology, petrogeochemistry, tectonic environment and emplacement mechanism, and combined with the study of tectonic evolution in adjacent areas, it is considered that the metamorphic plutonic magma in Kaiyuan area of northern Liaoning came from relatively shallow local melting of basic paleocontinental crust.Geotectonic location was in the contact zone between oceanic crust and continental crust, which indicates that there might have been collision and accretion of continental crust near Qinghe fault in Neoarchean.The diorite-quartz diorite-granodiorite-monzogranitic gneiss body shows that the continental crust has undergone a long period of accretion and continental activity, and has changed from the early basic continental crust to the present silica-alumina continental crust.
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致谢: 野外工作得到中国地质调查局沈阳地质调查中心李东涛主任、辽宁省地质调查院相关领导、刘锦等同事的指导与帮助，文章编写中得到东北大学王恩德教授的帮助与指导，审稿专家提出的宝贵修改意见，测试工作得到自然资源部沈阳矿产资源监督检测中心、南京宏创、北京燕都中实公司在岩石地球化学、锆石测年中的帮助，在此一并致谢。
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图版Ⅰ A.英云闪长质片麻岩；B.英云闪长质片麻岩显微照片；C.花岗闪长质片麻岩；D.花岗闪长质片麻岩显微照片；E.二长花岗质片麻岩；F.二长花岗质片麻岩显微照片；G.英云闪长质片麻岩中片麻理S2与表壳岩包体(abl)中S1片麻理斜交；H.英云闪长质片麻岩中的叠加褶皱素描图
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图 4 英云闪长质片麻岩锆石阴极发光(CL)图像、测点编号、207Pb/206Pb年龄(a)及U-Pb谐和图(b)
Figure 4. Zircon CL images, measuring point number, 207Pb/206Pb ages(a)and U-Pb concordia diagram of quartz dioritic gneiss
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图 5 新太古代变质深成岩温度(℃)(a)及压力(GPa)图解(b)
Figure 5. The temperature(a)and pressure(b)diagrams of the Neoarchaean metamorphic plutonic dioritic gneiss
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图 6 新太古代变质深成岩CaO-Na2O-K2O图解(a)及YbN-(La/Yb)N图解(b)
TTG—变质深成岩；CA—钙碱性岩；UM—上地幔；CFB—洋壳
Figure 6. The CaO-Na2O-K2O(a) and YbN-(La/Yb)N(b) diagrams of the Neoarchaean metamorphic plutonic rocks
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图 7 新太古代变质深成岩(Y+Nb)-Rb(a)和Yb-Ta图解(b)
VAG—火山弧花岗岩；WPG—板内花岗岩；ORG—洋脊花岗岩；Syn-COLG—同碰撞花岗岩
Figure 7. The (Y+Nb)-Rb(a)and Yb-Ta(b)diagrams of the Neoarchaean metamorphic plutonic rocks
表 1 新太古代变质深成岩主量、微量和稀土元素分析结果
Table 1 The analytical results of major, trace and rare earth elements of Neoarchaean metamorphic plutonic rocks
含量 ηγAr3(二长花岗质片麻岩) γδAr3(花岗闪长质片麻岩) γδοAr3(英云闪长质片麻岩) TY1 TY2 TY3 TY4 TY5 TY6 TY7 TY8 TY9 SiO2 58.06 65.94 75.98 68.48 55.50 62.52 56.19 55.33 54.28 TiO2 0.81 0.42 0.21 0.51 0.72 0.72 1.54 1.13 1.68 Al2O3 16.23 15.77 12 16.11 13.78 15.45 17.35 17.53 19.64 Fe2O3 1.40 1.33 0.12 1.13 2.83 0.92 2.25 2.51 3.04 FeO 6.14 1.35 1.96 1.83 5.21 3.67 5.05 5.74 4.21 MnO 0.1 0.03 0.03 0.04 0.16 0.08 0.11 0.12 0.11 MgO 4.61 0.69 0.55 0.74 6.01 4.06 3.54 4.28 2.52 CaO 3.94 1.78 0.99 1.65 7.42 4.35 5.45 5.46 5.91 Na2O 3.11 3.12 2.26 3.69 3.82 3.65 4.48 4.22 5.07 K2O 3.46 5.4 5.28 5.52 2.6 2.28 2.38 2.10 1.84 P2O5 0.31 0.12 0.07 0.16 0.49 0.2 0.46 0.34 0.5 烧失量 0.88 2.89 0.38 0.13 1.26 1.1 0.98 0.82 0.85 合计 99.05 98.84 99.83 99.99 99.8 99 99.78 99.58 99.65 A/NK 1.83 1.44 1.27 1.34 1.52 1.82 1.74 1.9 1.9 A/CNK 1.01 1.11 1.07 1.07 0.61 0.94 0.87 0.92 0.93 σ43 2.82 3.13 1.72 3.33 3.28 1.78 3.55 3.21 4.19 DI 63.58 82.94 92.15 87.97 56.47 67.87 62.77 58.21 62.45 Rb 88 105 134 91.9 50.6 84.8 79.9 75.1 52 K 28710.64 44808.51 43812.77 45804.26 21574.47 18919.15 19748.94 17425.53 15268.09 Ba 1220 1522 1226 1086 1460 580 776 610 716 Th 5.5 10.2 21.2 9.11 11.5 9.4 7.97 7.57 13.9 U 0.15 0.54 3.24 0.62 0.42 1.87 1.43 1.08 1.44 Nb 6.94 8.07 9.10 8.91 7.73 6.63 14.70 13.3 25.7 Sr 810 653 253 761 1464 759 938 808 877 Nd 25.3 17.9 32.6 38.8 60.8 21.7 38.9 32.4 50.6 P 1353.52 523.94 305.63 698.59 2139.44 873.24 2008.45 1484.51 2183.1 Zr 269 202 137 250 114 215 355 139 443 Hf 6.45 5.17 4.36 6.48 1.84 4.64 7.44 4.10 8.58 Ti 4860 2520 1260 3060 4320 4320 9240 6780 10080 K/Rb 326.26 426.75 326.96 498.41 426.37 223.10 247.17 232.03 293.62 Rb/Sr 0.11 0.16 0.53 0.12 0.03 0.11 0.09 0.09 0.06 Ba/Sr 1.51 2.33 4.85 1.43 1.00 0.76 0.83 0.75 0.82 La 30.2 31.5 38.4 57.3 50.6 24.3 30.5 41.8 55.4 Ce 59.2 87.3 75.6 117 123 43.6 72 78 113 Pr 6.48 5.84 9.38 11.5 14.2 5.52 9.28 8.68 12.9 Sm 4.07 2.83 6.97 5 11 3.93 7.04 5.36 9.05 Eu 1.62 1.33 1.33 1.55 2.68 1.25 2.26 1.38 2.27 Gd 4.08 2.42 5.82 4.08 9.07 3.68 6.78 4.75 7.89 Tb 0.44 0.32 1 0.48 1.08 0.47 0.96 0.69 1.07 Dy 2.16 1.91 6.35 2.22 5.80 2.81 5.30 4.04 5.97 Ho 0.43 0.31 1.28 0.35 0.77 0.56 0.99 0.77 1.04 Er 1.32 0.48 3.63 0.57 2.53 1.77 2.67 1.95 3.17 Tm 0.19 0.08 0.51 0.06 0.33 0.27 0.41 0.28 0.4 Yb 1 1.19 3.28 1.27 1.87 1.39 2.22 2.20 2.71 Lu 0.2 0.1 0.5 0.07 0.32 0.25 0.36 0.29 0.4 Y 16.5 6.13 35.9 7.07 24 14 23.8 18.5 29 ΣREE 136.69 153.51 186.65 240.26 284.05 111.5 179.67 182.59 265.87 LREE 126.87 146.7 164.28 231.15 262.28 100.3 159.98 167.62 243.22 HREE 9.82 6.81 22.37 9.11 21.77 11.20 19.69 14.97 22.65 LREE/HREE 12.92 21.54 7.34 25.38 12.05 8.96 8.12 11.2 10.74 LaN/YbN 21.66 18.99 8.4 32.36 19.41 12.54 9.85 13.63 14.66 Sm/Nd 0.16 0.16 0.21 0.13 0.18 0.18 0.18 0.17 0.18 δEu 1.20 1.51 0.62 1.02 0.80 0.99 0.99 0.82 0.80 注：主量元素含量单位为%，微量和稀土元素单位为10-6 
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表 2 英云闪长质片麻岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 2 LA-ICP-MS zircon U-Th-Pb isotope analytical data of quartz dioritic gneiss
点号 元素含量/10-6 Th/U 同位素比值 同位素年龄/Ma 总Pb 232Th 238U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ RZ09-01 94 52 185 0.28 0.1612 0.0031 9.836 0.214 0.4422 0.0047 2468 33 2420 20 2360 21 RZ09-02 111 99 210 0.47 0.1570 0.0024 9.768 0.168 0.4511 0.0047 2424 26 2413 16 2400 21 RZ09-03 114 154 196 0.79 0.1636 0.0025 10.52 0.178 0.4654 0.0039 2494 21 2482 16 2463 17 RZ09-04 93 101 173 0.58 0.1605 0.0023 9.912 0.159 0.4475 0.0045 2461 24 2427 15 2384 20 RZ09-05 183 244 342 0.71 0.1610 0.0021 9.743 0.146 0.4378 0.0040 2466 22 2411 14 2341 18 RZ09-06 159 164 304 0.54 0.1598 0.0021 9.723 0.132 0.4409 0.0037 2453 22 2409 12 2355 16 RZ09-07 21 36 35 1.03 0.1660 0.0039 10.90 0.270 0.4791 0.0081 2518 45 2515 23 2523 35 RZ09-08 191 144 375 0.38 0.1656 0.0022 10.16 0.157 0.4434 0.0041 2513 23 2449 14 2366 18 RZ09-09 118 151 228 0.66 0.1592 0.0025 9.528 0.150 0.4339 0.0046 2447 26 2390 14 2323 21 RZ09-10 114 174 173 1.01 0.1634 0.0030 11.69 0.215 0.5179 0.0050 2490 30 2580 17 2690 21 RZ09-11 339 157 734 0.21 0.1609 0.0023 9.381 0.147 0.4214 0.0044 2466 29 2376 14 2267 20 RZ09-12 147 281 247 1.14 0.1631 0.0025 10.17 0.169 0.4516 0.0047 2487 27 2451 15 2402 21 RZ09-13 154 273 268 1.02 0.1612 0.0024 9.854 0.162 0.4420 0.0044 2469 25 2421 15 2360 20 RZ09-14 134 122 255 0.48 0.1666 0.0024 10.46 0.171 0.4540 0.0047 2524 24 2476 15 2413 21 RZ09-15 105 103 201 0.51 0.1644 0.0024 10.13 0.154 0.4466 0.0043 2502 25 2447 14 2380 19 RZ09-16 122 87 230 0.38 0.1622 0.0024 10.34 0.158 0.4623 0.0043 2480 25 2466 14 2450 19 RZ09-17 116 168 203 0.83 0.1619 0.0024 10.39 0.177 0.4641 0.0039 2476 26 2471 16 2458 17 RZ09-18 299 163 564 0.29 0.1611 0.0022 10.36 0.158 0.4658 0.0043 2478 23 2468 14 2465 19 RZ09-19 56 153 76 2.01 0.1653 0.0035 11.23 0.249 0.4932 0.0056 2510 35 2543 21 2585 24 RZ09-20 128 181 222 0.81 0.1621 0.0026 10.45 0.195 0.4663 0.0051 2480 27 2475 17 2467 23
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