Discovery of Early Permian Island-Arc Type Granodiorites in Wenduermiao Area, Inner Mongolia: Constraints on Timing of Closure of PaleoAsian Ocean
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摘要: 研究区位于西伯利亚板块与华北板块之间的关键部位，可能代表了古亚洲洋最终闭合的位置.在嘎顺地区首次识别出花岗闪长岩，通过对岩石地球化学、锆石U-Pb年代学和Lu-Hf同位素分析，获得LA-MC-ICP-MS锆石U-Pb年龄为294.8±2.7 Ma，形成于早二叠世.SiO2含量介于64.69%~67.64%；Al2O3含量介于15.00%~15.52%；MgO含量介于1.14%~1.77%；Na2O含量介于1.41%~3.61%；K2O含量介于3.25%~3.98%.∑REE值介于157.89×10-6~174.43×10-6；LREE值介于147.86×10-6~149.55×10-6；HREE值介于9.34×10-6~11.8×10-6；右倾稀土配分曲线，呈轻度负Eu异常，轻重稀土元素分馏程度大，轻稀土相对于重稀土明显富集.明显富集Rb、K，亏损Ba、Sr大离子亲石元素（LILE）；富集Th，亏损Nb、Ta、Ti等高场强元素（HFSE）.锆石176Hf/177Hf值介于0.282 673~0.282 791；εHf（t）值介于2.7~7.0，其二阶段模式年龄TDM2介于861~1 129 Ma，176Lu/177Hf值介于0.000 486~0.000 734，结合岩石地球化学特征，认为该套岩石形成于岛弧岩浆作用，证实了早二叠世古亚洲洋仍未闭合.Abstract: The study area is located in the key part between the North China and the Siberia plates, which may represent the final closure of the Paleo-Asian Ocean. Granodiorites were recognized in the Gashun area for the first time. According to petrogeochemistry, zircon U-Pb geochronology and Lu-Hf isotope analysis, the granodiorites yield an LA-MC-ICP-MS zircon UPb age of 294.8±2.7 Ma, suggesting that they were formed in the Early Permian. The rocks have SiO2=64.69%-67.64%, Al2O3=15.00%-15.52%, MgO=1.14%-1.77%, Na2O=1.41%-3.61%, and K2O=3.25%-3.98%. The content of ∑ REE varies from 157.89×10-6 to 174.43×10-6, the content of LREE varies from 147.86×10-6 to 149.55×10-6, and the content of HREE vary from 9.34×10-6 to 11.8×10-6. The rocks display rightly-inclined REE distribution curves, slightly negative Eu anomalies, highly fractionated LREE/HREE, and more enriched LREE relative to HREE. In the rocks, Rb and K were obviously enriched, and Ba and Sr (LILE) were depleted; Th was enriched and Nb, Ta and Ti etc. (HFSE) were depleted. Zircon 176Hf/177Hf changes from 0.282 673 to 0.282 791, and εHf(t) varies from 2.7 to 7.0. The two-stage model ages (TDM2) vary from 861 Ma to 1 129 Ma, and 176Lu/177Hf ranges from 0.000 486 to 0.000 734. Combined with petrogeochemical characteristics, this set of granodiorites is considered to be formed by island-arc magmatism, confirming that the Paleo-Asian Ocean was still open in the Early Permian.
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Key words:
- island-arc type granodiorite /
- Paleo-Asian Ocean /
- Wenduermiao area /
- petrology
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图 1 研究区地质图
a.研究区大地构造位置；b.朱日和俯冲增生杂岩分布图；c.研究区地质成果简图.图a, b据初航等(2013)改编; 图c引自内蒙古自治区地质调查院（2018）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成果报告.图a中：①南蒙活动陆缘；②贺根山蛇绿岩-岛弧增生杂岩；③宝力道岛弧增生杂岩；④二道井增生杂岩；⑤温都尔庙俯冲增生杂岩；⑥白乃庙岛弧带
Fig. 1. Geological map of study area
图 2 花岗闪长岩标本及镜下显微照片
Pl.斜长石；Qtz.石英；Bi.黑云母.图为-2.5×（+）正交偏光
Fig. 2. Specimens and microphotograph of medium-fine grained biotite granodiorite
图 3 花岗闪长岩岩石类型判别图解
a.TAS图解；b.A/NK-A/CNK图解.图a据MacDonald and Katsura(1964)和Le Maitre et al.(2002)；图b据Maniar and Piccoli(1989)
Fig. 3. Granodiorite type discrimination diagrams
图 4 花岗闪长岩稀土配分曲线（a）和微量元素蛛图解（b）
球粒陨石REE数据、原始地幔数据据Sun and McDonough（1989）
Fig. 4. REE distribution curves(a) and trace element spidergrams(b) of granodiorite
图 5 花岗闪长岩锆石阴极发光图像及其分析位置及年龄值
黄色圆圈为测年位置，其中实线为参与谐和点，虚线为不参与谐和点；白色圆圈为Lu-Hf测试位置
Fig. 5. CL images of zircon crystals of granodiorite
图 7 构造环境判别图解
a.Nb-Y图; b.Rb-(Yb+Ta)图.引自Pearce et al.(1984)
Fig. 7. Discrimination diagrams of tectonic environment
图 9 埃达克岩与经典岛弧岩石判别图解
a.(La / Yb)N-YbN图；b.Sr/Y-Y图.据Martin(1999)
Fig. 9. Discrimination diagrams of adakite and representative island-arc magmatic rocks
表 1 花岗闪长岩全岩主量(%)、微量元素(10-6)分析结果
Table 1. Whole rock major and trace element analysis results of granodiorites
样品号 D9038-1 D9038-2 D9038-3 D9038-4 D9038-5 SiO2 64.69 67.16 66.83 67.64 66.58 TiO2 0.47 0.49 0.55 0.52 0.51 Al2O3 15.25 15.00 15.12 15.52 15.22 Fe2O3 2.47 2.85 2.59 2.83 2.69 FeO 0.29 0.16 0.34 0.18 0.24 TFeO 2.79 3.03 2.96 3.03 2.95 MnO 0.04 0.04 0.04 0.04 0.04 MgO 1.77 1.35 1.29 1.14 1.39 CaO 2.98 1.97 2.23 1.61 2.20 Na2O 2.32 1.41 3.61 2.95 2.57 K2O 3.41 3.98 3.65 3.25 3.57 P2O5 0.13 0.13 0.14 0.13 0.13 ∑ 96.49 97.44 99.22 98.71 97.96 LOI 3.50 2.50 0.70 1.20 1.98 Mg# 0.53 0.44 0.44 0.40 0.45 A/CNK 1.18 1.47 1.08 1.37 1.28 A/NK 2.03 2.26 1.53 1.85 1.92 DI 69.59 74.35 82.82 80.60 76.84 SI 17.50 14.11 11.38 11.20 13.55 AR 1.68 1.93 2.43 2.05 2.02 Hy 5.98 5.13 4.47 4.40 5.00 La 37.60 40.00 36.80 36.80 37.80 Ce 72.20 68.90 71.30 74.20 71.65 Pr 7.76 8.00 7.83 7.52 7.78 Nd 27.40 27.30 26.50 25.00 26.55 Sm 4.50 4.49 4.52 4.29 4.45 Eu 1.01 0.86 0.91 0.74 0.88 Gd 4.30 4.20 3.65 3.44 3.90 Tb 0.59 0.57 0.46 0.42 0.51 Dy 2.93 2.70 2.49 2.18 2.58 Ho 0.56 0.53 0.47 0.44 0.50 Er 1.72 1.35 1.29 1.20 1.39 Tm 0.21 0.24 0.19 0.18 0.21 Yb 1.62 1.55 1.41 1.28 1.47 Lu 0.26 0.24 0.21 0.20 0.23 Y 14.70 13.50 13.00 11.80 13.25 ∑REE 177.40 174.43 158.03 157.89 166.94 LREE 150.50 149.55 147.86 148.55 149.12 HREE 12.19 11.38 10.17 9.34 10.77 LR/HR 12.34 13.14 14.54 15.90 13.98 δEu 0.69 0.60 0.66 0.57 0.63 δCe 0.97 0.88 0.96 1.02 0.96 LaN 121.30 129.03 118.71 118.71 121.94 YbN 7.75 7.42 6.75 6.12 7.01 La/Yb 23.21 25.81 26.10 28.75 25.97 (La/Yb)N 15.65 17.39 17.59 19.40 17.51 Cd 0.081 0.064 0.044 0.014 0.050 Li 2.60 3.72 23.40 9.40 9.78 Rb 136.00 169.00 166.00 140.00 152.75 Cs 6.75 14.90 9.17 10.40 10.31 Sr 84.50 74.60 264.00 92.40 128.88 Ba 401 312 573 366 413 Sc 6.95 7.55 11.70 6.96 8.29 Nb 9.85 9.41 9.77 9.29 9.58 Ta 1.02 0.78 0.71 0.68 0.80 Zr 227 225 230 226 227 Hf 7.24 7.12 6.97 6.82 7.04 Be 2.22 2.30 2.96 2.40 2.47 Ga 17.90 17.20 17.30 17.80 17.55 In 0.028 0.035 0.040 0.025 0.030 Tl 0.90 1.00 1.02 0.86 0.95 U 4.65 3.25 2.15 2.80 3.21 Th 31.00 32.40 24.00 25.60 28.25 K 28 307 33 039 30 299 26 979 29 656 P 567.4 567.4 611.0 567.4 578.3 Ti 2 818.0 2 938.0 3 297.0 3 117.0 3042.5 
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表 2 花岗闪长岩锆石U-Pb同位素数据
Table 2. Data of zircon U-Pb isotope of granodiorite
样品号 含量(10-6) Th/U 同位素比值 年龄(Ma) D9038 Pb U 206Pb/238U err% 207Pb/235U err% 207Pb/206Pb err% 206Pb/238U 1б 207Pb/235U 1б D9038.1 24.24 421.37 1.05 0.05 0.54 0.38 1.06 0.06 0.89 305.34 1.08 323.98 1.63 D9038.2 26.09 466.64 1.08 0.05 0.51 0.37 1.09 0.06 0.89 295.93 1.07 321.85 1.65 D9038.3 16.37 286.46 1.36 0.05 0.51 0.35 1.55 0.06 1.47 291.03 1.07 306.84 1.98 D9038.4 27.18 461.75 1.14 0.05 0.57 0.41 1.08 0.06 0.88 300.57 1.10 350.76 1.64 D9038.5 22.28 410.48 1.10 0.05 0.46 0.33 1.06 0.05 0.92 286.81 1.04 288.32 1.63 D9038.6 29.04 422.29 0.97 0.05 0.73 0.63 1.00 0.09 0.77 335.99 1.19 494.06 1.60 D9038.7 25.64 447.65 1.08 0.05 0.55 0.34 1.10 0.05 0.95 300.40 1.09 297.88 1.66 D9038.8 24.52 442.42 0.99 0.05 0.58 0.35 1.23 0.05 1.00 295.66 1.10 306.45 1.75 D9038.9 22.53 391.54 1.21 0.05 0.65 0.36 1.81 0.06 1.59 288.09 1.14 314.02 2.19 D9038.10 19.63 341.50 1.14 0.05 0.63 0.34 1.58 0.05 1.33 294.56 1.13 296.74 2.01 D9038.11 21.95 389.44 1.06 0.05 0.52 0.36 1.37 0.06 1.17 290.65 1.07 315.77 1.84 D9038.12 21.25 364.91 1.14 0.05 0.43 0.38 1.23 0.06 1.10 297.57 1.03 324.36 1.75 D9038.13 21.54 381.38 1.16 0.05 0.52 0.34 1.26 0.05 1.12 291.48 1.07 296.85 1.77 D9038.14 55.51 755.16 1.17 0.05 0.60 0.86 0.60 0.12 0.77 317.81 1.12 629.32 1.38 D9038.15 23.25 418.51 1.13 0.05 0.45 0.33 1.18 0.05 1.05 291.36 1.04 289.95 1.71 D9038.16 17.64 303.46 1.28 0.05 0.62 0.39 2.22 0.06 1.75 291.80 1.13 334.35 2.54 D9038.17 47.73 509.60 1.54 0.05 2.07 1.29 7.15 0.15 3.93 340.68 2.28 842.16 7.26 D9038.18 19.39 342.20 1.20 0.05 0.47 0.37 1.37 0.06 1.27 293.30 1.05 317.49 1.85 D9038.19 16.29 286.92 1.12 0.05 0.64 0.34 1.59 0.05 1.46 302.65 1.14 294.45 2.01 D9038.20 18.60 326.54 1.14 0.05 0.60 0.35 1.48 0.05 1.30 302.94 1.12 307.88 1.93 D9038.21 19.58 319.74 1.22 0.05 0.64 0.37 1.45 0.05 1.30 319.08 1.14 317.33 1.91 D9038.22 23.54 437.36 1.15 0.05 0.71 0.35 1.55 0.06 1.36 284.36 1.18 306.14 1.99 D9038.23 65.41 322.15 1.49 0.09 2.79 4.8 5.33 0.33 3.74 527.57 2.94 1784.07 5.48 D9038.24 19.45 335.34 1.20 0.05 0.48 0.48 2.40 0.07 2.12 291.61 1.06 400.81 2.70 D9038.25 15.36 279.96 1.18 0.05 0.45 0.32 1.71 0.05 1.64 287.34 1.04 285.07 2.11 D9038.26 18.96 339.77 1.22 0.05 0.60 0.33 1.60 0.05 1.42 292.33 1.12 290.25 2.03 D9038.27 25.65 436.58 1.12 0.05 0.52 0.40 0.97 0.06 0.90 304.54 1.07 341.53 1.57 D9038.28 25.93 445.79 1.09 0.05 0.51 0.38 1.05 0.06 0.98 305.83 1.07 330.08 1.62 D9038.29 19.68 320.00 1.20 0.05 0.55 0.42 1.12 0.06 1.26 313.84 1.09 358.99 1.67 D9038.30 18.80 319.68 1.44 0.05 0.45 0.35 1.51 0.05 1.34 291.27 1.04 305.48 1.95 D9038.31 40.58 459.26 1.20 0.07 0.51 0.57 0.81 0.06 0.61 458.36 1.07 457.60 1.48
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表 3 花岗闪长岩锆石Lu-Hf同位素数据
Table 3. Data of zircon Lu-Hf isotope of granodiorite
样品 点号 t(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf εHf(0) εHf(t) TDM1(Ma) TDM2(Ma) fLu/Hf TW9038 2 296 0.019 445 0.000 622 0.282 769 -0.1 6.3 678 910 -0.98 3 291 0.015 705 0.000 515 0.282 742 -1.1 5.2 714 972 -0.98 8 296 0.017 810 0.000 569 0.282 740 -1.1 5.3 717 974 -0.98 9 288 0.014 790 0.000 492 0.282 673 -3.5 2.7 809 1 129 -0.99 11 291 0.014 145 0.000 534 0.282 715 -2.0 4.3 751 1 033 -0.98 12 298 0.015 579 0.000 486 0.282 742 -1.1 5.4 713 968 -0.99 13 291 0.017 519 0.000 576 0.282 791 0.7 7.0 646 861 -0.98 15 291 0.016 620 0.000 547 0.282 734 -1.3 5.0 725 990 -0.98 16 292 0.015 068 0.000 490 0.282 742 -1.1 5.3 713 972 -0.99 18 293 0.022 694 0.000 732 0.282 762 -0.4 6.0 689 928 -0.98 24 292 0.021 585 0.000 652 0.282 770 -0.1 6.2 677 910 -0.98 26 292 0.021 694 0.000 668 0.282 750 -0.8 5.5 705 954 -0.98 30 291 0.023 964 0.000 734 0.282 788 0.6 6.8 653 871 -0.98
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表 4 华北板块北缘二叠纪岩浆岩年龄汇总
Table 4. Summary of ages of the Permian igneous rocks in the northern margin of the North China block
序号 样品号 纬度(N) 经度(E) 采样位置 岩性 年龄（Ma） 测试方法 来源 侵入岩 1 D464 40°57′29″ 116°45′08″ 五道营子 闪长岩 283±2 LA-ICP-MS Zhang et al., 2009a 2 D252 41°03.3′ 116°55.5′ 镶黄旗 辉长岩 276±2 SHRIMP Zhang et al., 2009a 3 D490 41°03′57″ 117°20′22″ 波罗诺 角闪辉长岩 297±1 LA-ICP-MS Zhang et al., 2009b 4 BJG1 41°35′ 111°9.6′ 四子王旗 正长花岗岩 264±3.4 LA-ICP-MS 柳长峰等，2010 5 99-7 42.42° 113.61° 镶黄旗 黑云角闪石英闪长岩 277.2±2.9 LA-ICP-MS 童英等，2010 火山岩 6 07057-1 41°50.62′ 112°51.18′ 三井泉乡 流纹质凝灰岩 276±2 LA-ICP-MS Zhang et al., 2016 7 07D024-1 42°24.40′ 119°41.58′ 赤峰 安山岩 273±6 SHRIMP Zhang et al., 2016 8 P28N9-1 41°45′53″ 113°13′49″ 西井子 流纹岩 269.5±3.4 LA-ICP-MS 董晓杰等，2016 9 08485 41°59′33″ 111°34′24″ 达茂旗 流纹岩 264±2 LA-ICP-MS Zhang et al., 2016 10 PM003TW4 42°39′00″ 113°00′25″ 乌兰沟 流纹岩 282.1±1.5 LA-ICP-MS a 11 TW9039 42°20′58″ 112°59′57″ 嘎顺 安山岩 270.2±2.7 LA-ICP-MS 注：a为内蒙古自治区地质调查院（2018）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成果报告.
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