Oceanic crust subduction in the Zhurihe area, central Inner Mongolia during Middle Ordovician: Constrains from age and geochemistry of trondhjemites
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摘要:
系统研究了内蒙古中部朱日和地区最新发现的奥长花岗岩锆石U-Pb同位素年龄、Hf同位素组成及岩石地球化学特征, 对该区中奥陶世洋壳俯冲作用给出制约。结果显示, 奥长花岗岩形成于中奥陶世(472±3 Ma和466±5 Ma), 富Si、富Al、富Na、贫K, 高Sr、低Y和Yb, 具正Eu异常、正Sr异常, 轻、重稀土元素分馏强烈, 富集大离子亲石元素, 亏损高场强元素, 表现为典型的俯冲洋壳型埃达克岩地球化学特征。奥长花岗岩的锆石εHf(t)值为+8.8~+15.1, 一阶段模式年龄(TDM1)为475~728 Ma, 二阶段模式年龄(TDM2)为476~885 Ma。最新区域地质调查资料显示, 朱日和地区存在一个早古生代洋壳俯冲带, 表明至少在中奥陶世, 朱日和日地区开始出现古亚洲洋向华北板块的洋壳俯冲作用, 而具有典型埃达克岩特征的奥长花岗岩所代表的岩浆侵位结晶活动正是对该洋壳俯冲事件的响应。
Abstract:This paper reports zircon U-Pb ages and Hf isotope data as well as geochemical data of trondhjemites which are latest discovered from the Zhurihe area in central Inner Mongolia, with the aim of constraining oceanic crust subduction during Middle Ordovician.The dating results show that the trondhjemites formed in Middle Ordovician (472±3 Ma and 466±5 Ma).The trondhjemites manifest as the geochemical characteristics of typical subducted-oceanic-crust-type adakites being rich in Si, Al, Na and poor in K, with high values of Sr and low values of Y and Yb, with Eu and Sr positive anomalies, with intense fractionation between light rare earth elements and heavy rare earth elements, being rich in large ion lithophile elements (LILEs) and loss of high field strength elements(HFSEs).The zircon εHf(t) values of trondhjemites are between +8.8 and +15.1, so are TDM1 values between 475 Ma and 728 Ma as well as TDM2 values between 476 Ma and 885 Ma.According to the latest regional geological survey, there exist an Early Paleozoic oceanic subduction zone in the Zhurihe area what indicates at least during Middle Ordovician the Paleo-Asian Ocean began to subduct towards the North China plate in the Zhurihe area.The magmatic emplacement-crystallization activities which are represented by the trondhjemites with the characteristics of typical adakites are response to the oceanic crust subduction.
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表 1 奥长花岗岩锆石U-Th-Pb同位素数据
Table 1. Zircon U-Th-Pb isotope data from trondhjemites
测点号 元素含量/10-6 Th/U 同位素比值 锆石U-Pb表面年龄/Ma 谐和度
/%Pb Th U 206Pb/ 238U 1σ 207Pb/ 235U 1σ 207Pb/206Pb 1σ 206Pb/ 238U 1σ 207Pb/235U 1σ 207Pb/ 206Pb 1σ 样品ZRH1 1 9 47 108 0.44 0.0785 0.0008 0.6549 0.0163 0.0603 0.0012 487.1 1.4 512 3 616 2 95 2 7 24 88 0.28 0.0750 0.0003 0.5855 0.0154 0.0566 0.0015 466.2 1.1 468 3 476 3 99 3 15 88 194 0.45 0.0751 0.0003 0.5821 0.0070 0.0562 0.0006 467.0 1.1 466 2 461 2 99 4 22 208 256 0.81 0.0765 0.0005 0.5830 0.0067 0.0553 0.0005 475.1 1.1 466 2 425 2 98 5 9 58 121 0.48 0.0721 0.0002 0.5458 0.0108 0.0549 0.0011 448.8 1.0 442 2 406 2 98 6 15 106 179 0.59 0.0760 0.0005 0.6655 0.0104 0.0632 0.0008 472.0 1.2 518 2 713 2 90 7 44 114 145 0.79 0.2596 0.0014 3.3427 0.0279 0.0931 0.0004 1488 1.1 1491 1 1491 1 99 8 11 83 134 0.62 0.0759 0.0005 0.5737 0.0109 0.0550 0.0010 471.3 1.1 460 2 413 2 97 9 24 238 272 0.87 0.0754 0.0003 0.6138 0.0066 0.0590 0.0005 468.8 1.1 486 2 566 2 96 10 4 3 58 0.05 0.0758 0.0004 0.5339 0.0214 0.0515 0.0020 470.7 1.1 434 4 261 4 91 11 128 146 329 0.44 0.3577 0.0018 5.8678 0.0327 0.1190 0.0003 1971 1.1 1956 1 1941 1 99 12 12 27 153 0.18 0.0766 0.0004 0.6225 0.0107 0.0588 0.0009 475.7 1.1 491 2 558 2 96 13 11 68 132 0.52 0.0763 0.0004 0.5603 0.0098 0.0532 0.0009 473.7 1.1 452 2 339 2 95 14 18 64 239 0.27 0.0768 0.0005 0.6087 0.0071 0.0575 0.0005 476.8 1.1 483 2 509 2 98 15 18 39 232 0.17 0.0761 0.0004 0.6714 0.0073 0.0641 0.0006 472.7 1.1 522 2 743 2 90 样品ZRH2 1 14 40 196 0.20 0.0739 0.0003 0.5759 0.0073 0.0565 0.0007 459.7 1.0 462 2 472 23 99 2 22 93 294 0.32 0.0738 0.0003 0.5762 0.0057 0.0566 0.0005 458.8 1.1 462 2 476 19 99 3 20 30 277 0.11 0.0777 0.0005 0.5744 0.0064 0.0536 0.0005 482.6 1.1 461 2 354 22 95 4 38 123 523 0.24 0.0744 0.0003 0.5793 0.0039 0.0565 0.0003 462.9 1.0 464 1 472 13 99 5 4 4 63 0.06 0.0757 0.0004 0.6489 0.0228 0.0622 0.0021 470.2 1.1 508 4 680 74 92 6 22 31 307 0.10 0.0741 0.0004 0.5837 0.0055 0.0571 0.0004 460.9 1.1 467 2 498 21 98 7 9 90 107 0.84 0.0758 0.0004 0.6222 0.0131 0.0593 0.0012 471.0 1.1 491 2 589 17 95 8 8 91 88 1.03 0.0748 0.0004 0.5678 0.0162 0.0551 0.0015 465.1 1.1 457 3 417 61 98 9 49 151 655 0.23 0.0767 0.0005 0.5951 0.0051 0.0562 0.0003 476.2 1.1 474 2 461 11 99 10 3 4 46 0.09 0.0749 0.0005 0.5216 0.0344 0.0501 0.0032 465.6 1.1 426 7 211 144 91 11 22 54 303 0.18 0.0738 0.0004 0.5529 0.0060 0.0543 0.0005 459.2 1.1 447 2 383 22 97 12 5 4 69 0.06 0.0750 0.0005 0.6296 0.0226 0.0610 0.0022 466.3 1.1 496 4 640 78 93 13 9 15 121 0.12 0.0735 0.0003 0.5986 0.0111 0.0592 0.0011 457.1 1.0 476 2 576 6 95 14 21 49 303 0.16 0.0732 0.0002 0.5956 0.0057 0.0589 0.0005 455.5 1.0 474 2 565 19 95 15 11 11 155 0.07 0.0780 0.0006 0.6353 0.0104 0.0590 0.0008 484.4 1.2 499 2 565 -- 96 16 23 58 305 0.19 0.0776 0.0003 0.6369 0.0048 0.0596 0.0004 481.8 1.0 500 1 591 17 96 17 67 313 857 0.37 0.0772 0.0005 0.5933 0.0041 0.0558 0.0002 479.2 1.1 473 1 443 7 98 18 38 83 537 0.15 0.0733 0.0003 0.5622 0.0040 0.0556 0.0003 456.0 1.0 453 1 439 8 99 19 28 50 392 0.13 0.0736 0.0004 0.5813 0.0049 0.0573 0.0004 457.8 1.1 465 2 502 15 98 
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表 2 奥长花岗岩(样品ZRH1)锆石Hf同位素测试数据
Table 2. Zircon Hf isotope test data from trondhjemites (Sample ZRH1)
测点号 t
/Ma176Yb/177Hf 176Lu/177Hf 176Hf/177Hf εHf(0) εHf(t) TDM1
/MaTDM2
/MafLu/Hf 测值 2σ 测值 2σ 测值 2σ 1 466.2 0.007931 0.000233 0.000387 0.000007 0.282911 0.000028 4.9 15.1 476 482 -0.99 2 475.1 0.030210 0.000342 0.001327 0.000008 0.282914 0.000026 5.0 15.1 484 489 -0.96 3 472.0 0.033540 0.000266 0.001453 0.000015 0.282915 0.000027 5.1 15.0 483 490 -0.96 4 471.3 0.008224 0.000158 0.000924 0.000009 0.282913 0.000025 5.0 15.1 479 484 -0.97 5 468.8 0.016087 0.000313 0.000657 0.000014 0.282733 0.000024 -1.4 8.8 728 885 -0.98 6 470.7 0.004658 0.000163 0.000240 0.000007 0.282812 0.000019 1.4 11.7 612 700 -0.99 7 475.7 0.029868 0.000366 0.001224 0.000010 0.282814 0.000026 1.5 11.6 625 711 -0.96 8 473.7 0.025055 0.000568 0.001188 0.000020 0.282918 0.000028 5.2 15.3 475 476 -0.96 9 478.8 0.032463 0.000364 0.001235 0.000008 0.282913 0.000025 5.0 15.2 483 486 -0.96 10 472.7 0.032672 0.000283 0.001364 0.000012 0.282915 0.000024 5.1 15.1 482 488 -0.96 注：εHf(0)、εHf(t)、TDM1及TDM2值计算公式据参考文献[33]，公式如下：εHf(0=10000[(176Hf/177Hf)s/(176Hf/177Hf)CHUR, 0-1]；εHf(t=10000{[(176Hf/177Hf)s-(176Lu/177Hf)s×(eλt-1)]/[(176Hf/177Hf)CHUR, 0-(176Lu/177Hf)CHUR×(eλt-1)]-1}；TDM1=1/λ×ln{1+[(176Hf/177Hf)s-(176Hf/177Hf)DM]/[(176Lu/177Hf)s-(176Lu/177Hf)DM]}；TDM2=TDM1-(TDM1-t)×(fcc-fs)/(fcc-fDM)；fLu/Hf=(176Lu/177Hf)s/(176Lu/177Hf)CHUR-1；其中：λ=1.867×10-11/a[34]；(176Lu/177Hf)s和(176Hf/177Hf)s为样品测量值；(176Lu/177Hf)CHUR=0.0332，(176Hf/177Hf)CHUR, 0=0.282772[35]；(176Lu/177Hf)DM=0.0384，(176Hf/177Hf)DM=0.28325[36]；(176Lu/177Hf)平均地壳=0.015[37]；fcc=[(176Lu/177Hf)平均地壳/(176Lu/177Hf)CHUR]-1；fs=fLu/Hf；fDM=(176Lu/177Hf)DM/(176Lu/177Hf)CHUR-1；t为锆石结晶年龄
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表 3 奥长花岗岩主量、微量和稀土元素含量及相关参数
Table 3. Contents of major, trace and rare earth elements and related parameters from trondhjemites
样号 ZRH1 ZRH2 ZRH3 ZRH4 MT1-4 样号 ZRH1 ZRH2 ZRH3 ZRH4 MT1-4 SiO2 73.76 73.71 74.75 71.62 74.93 Ti 899.25 551.54 473.605 839.30 239.80 TiO2 0.15 0.09 0.08 0.14 0.04 La 4.18 11.6 4.67 4.16 0.87 Al2O3 15.66 15.10 15.01 16.16 14.77 Ce 7.86 17.8 7.73 6.10 2.07 Fe2O3 0.86 0.48 0.12 0.29 0.86 Pr 0.75 1.73 0.72 0.57 0.21 FeO 0.36 0.26 0.38 0.80 0.60 Nd 2.55 5.49 2.37 1.85 0.86 TFeO 1.26 0.77 0.54 1.17 Sm 0.51 0.70 0.33 0.31 0.19 MnO 0.02 0.01 0.01 0.02 0.04 Eu 0.28 0.34 0.18 0.23 0.19 MgO 0.57 0.34 0.27 0.61 2.58 Gd 0.45 0.65 0.33 0.28 0.17 CaO 2.62 2.85 2.34 2.81 2.58 Tb 0.06 0.06 0.03 0.03 0.03 Na2O 4.83 5.78 4.76 5.67 5.29 Dy 0.34 0.30 0.16 0.19 0.14 K2O 0.60 0.37 0.38 0.50 0.38 Ho 0.08 0.06 0.04 0.04 0.03 P2O5 0.03 0.02 0.01 0.02 0.01 Er 0.24 0.17 0.10 0.13 0.10 总计 99.47 99.01 98.88 98.64 99.8 Tm 0.04 0.03 0.02 0.02 0.02 烧失量 1.49 1.96 1.06 2.29 0.63 Yb 0.35 0.22 0.16 0.18 0.16 Mg# 55 50 36 37 Lu 0.07 0.05 0.03 0.04 0.04 A/CNK 1.10 0.93 1.02 1.01 Y 2.36 1.50 1.04 1.37 0.92 A/NK 1.71 1.42 1.55 1.54 Sr/Y 213 198 450 427 AR 1.85 2.04 1.96 2.05 ∑REE 17.76 39.2 16.87 14.14 Rb 14.3 9.4 5.8 8.6 8.2 LREE 16.13 37.66 16.00 13.22 Sr 503 297 468 585 566 HREE 1.63 1.54 0.87 0.92 Ba 290 388 148 206 761 LR/HR 9.89 24.52 18.37 14.39 Nb 2.68 1.24 1.19 1.32 0.41 δEu 1.75 1.52 1.66 2.34 Ta 0.16 0.09 0.12 0.08 δCe 0.99 0.85 0.91 0.83 Zr 80.10 52.60 28.80 61.10 35.90 LaN 13.48 37.42 15.06 13.42 Hf 2.21 1.76 1.24 1.68 YbN 1.67 1.05 0.77 0.86 Th 1.10 3.03 1.46 1.53 La/Yb 11.94 52.73 29.19 23.11 K 4980.80 3071.48 3154.49 4150.70 3155.50 (La/Yb)N 8.07 35.64 19.56 15.6 注：样号MT1-4为图林凯奥长花岗岩数据[38]；A/CNK=Al2O3/(CaO+Na2O+K2O)，A/NK=Al2O3/(Na2O+K2O)(摩尔比)；Mg#=100Mg2+/(Mg2++Fe2+)(%)；TFeO=Fe2O3+1.1FeO(%)；主量元素含量单位为%，微量和稀土元素含量单位为10-6
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① 内蒙古自治区地质调查院. 内蒙古自治区区域地质志. 2018.
② 内蒙古自治区地质调查院. 内蒙古锡林郭勒盟朱日和等三幅1: 5万地质矿产综合调查报告. 2018.
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