地球科学进展

地球科学进展 ›› 2019, Vol. 34 ›› Issue (4): 366 -381. doi: 10.11867/j.issn.1001-8166.2019.04.0366

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内蒙古狼山地区早二叠世晚期花岗闪长岩：地球化学、年代学、 Hf同位素特征及其地质意义
刘洋( ),王文龙( ),滕学建,郭硕,滕飞,何鹏,田健,段霄龙   
  1. 中国地质调查局天津地质调查中心，天津 300170
  • 收稿日期:2018-12-25 修回日期:2019-03-06 出版日期:2019-04-10
  • 通讯作者: 王文龙 E-mail:125313766@qq.com;499692710@qq.com;499692710@qq.com.
  • 基金资助:
    中国地质调查项目“1∶5万查干呼舒庙等六幅区域地质矿产调查”(编号：1212014121079)

Geochemistry and Hf Isotopes Characteristics and Geological Significance of Latest Early Permian Granodiorite of Langshan Area, Inner Mongolia

Yang Liu( ),Wenlong Wang( ),Xuejian Teng,Shuo Guo,Fei Teng,Peng He,Jian Tian,Xiaolong Duan   

  1. Tianjin Center of Geological Survey，China Geological Survey，Tianjin 300170，China
  • Received:2018-12-25 Revised:2019-03-06 Online:2019-04-10 Published:2019-05-27
  • Contact: Wenlong Wang E-mail:125313766@qq.com;499692710@qq.com;499692710@qq.com.
  • About author: Liu Yang （1986-）， male， Qitai County, Xinjiang Uygur Autonomous Region， Engineer. Research areas include structural geology. E-mail： 125313766@qq.com | Liu Yang （1986-）， male， Qitai County, Xinjiang Uygur Autonomous Region， Engineer. Research areas include structural geology. E-mail： 125313766@qq.com
  • Supported by:
    Project supported by the China geological survey project “1∶50,000 Chagan Hushu Miao and six other regional geological and mineral survey”(No. 1212014121079)
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狼山地区位于内蒙古西部，索伦蛇绿岩带西南，晚古生代岩浆岩分布广泛，是中亚造山带晚古生代构造演化研究的关键位置。利用LA-ICP-MS锆石U-Pb测年方法获得狼山地区沙日楚鲁花岗闪长岩及莫若古花岗闪长岩的形成时代分别为(278.07±0.66) Ma和(278.05±0.69) Ma，为早二叠世晚期岩浆活动的产物；岩石地球化学特征表明，狼山地区早二叠世晚期花岗闪长岩属于高钾钙碱性系列（SiO2：63.76%～67.88%；K2O：2.74%～4.02%）、弱过铝质岩石（A/CNK：0.94～1.07），具有中等的Mg#（38.98～47.53）；轻稀土（LREEs）及大离子亲石元素富集，重稀土及高场强元素亏损，具有弱的Eu负异常，为具有陆缘弧花岗岩特征的I型花岗岩。锆石Hf同位素分析结果显示，沙日楚鲁花岗闪长岩及莫若古花岗闪长岩具有负的而略显分散的εHf（t）值（-0.6～-7.5），其源区物质主要来源于华北古老地壳，并有少量幔源物质加入。结合区域地质背景，认为狼山地区早二叠世晚期花岗闪长岩形成于古亚洲洋向南俯冲的活动大陆边缘环境，彼时洋盆尚未闭合。

关键词: 华北北缘, 狼山地区, 活动大陆边缘, 地球化学, I型花岗岩

The Langshan area is located in the west of Inner Mongolia, southwest of the Solonker ophiolite belt, which is the ideal workplace to study tectonic-magmatic evolution and geodynamics background in Late Paleozoic because of the intense magmatism. LA-ICP-MS Zircon U-Pb ages yielded the formation time of granodiorite of Sharichulu and Moruogu granitic pluton (278.07±0.66) Ma and (278.05±0.69) Ma, respectively, forming in the latest early Permian. Geochemical characteristics showed that the Zhalashan granites were high-K calc-alkaline (SiO2：63.76%～67.88%；K2O：2.74%～4.02%) and weak peraluminous rocks (A/CNK：0.94～1.07) with moderate Mg# values (38.98～47.53). In addition，it exhibited LILE and LREEs enriched, HFSE and HREEs depleted with slight Eu anomaly, and all of the above-mentioned indicated the characteristics of I-type granites and arc-related. Zircon Hf isotope showed that the scatter εHf（t）values varied from -0.6～-7.5, which suggests a mixed magma source of old continental crust with a small involvement of mantle components. Together with regional geological background，the authors hold that the Latest early Permian granodiorite of Langshan area formed in an active continental margin setting under the background of southward subduction of the Paleo-Asian Ocean which were not close at that time.

Key words: The northern margin of the North China Craton, Langshan area, Active continental margin, Geochemistry, I-type granitoid.

中图分类号: 

图1 狼山地区地质简图
Fig.1 Geological map in Langshan
图2 花岗闪长岩野外及镜下照片
Fig.2 Field and microscope photographs for granodiorite
表1 花岗闪长岩 LA-ICP-MS 锆石 U-Pb定年结果
Table 1 LA-ICP-MS zircon U-Pb dating results of the granodiorite
样品和岩性 样点号 含量/×10-6 Th/U 同位素比值 表面年龄/Ma
Pb U 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ
6477.1.01 15 348 0.23 0.3173 0.0040 0.0440 0.0002 0.0523 0.0006 278 1 280 4
样品：TW6477-1；岩性：花岗闪长岩 6477.1.02 10 229 0.35 0.3213 0.0056 0.0441 0.0002 0.0528 0.0009 278 1 283 5
6477.1.03 17 388 0.38 0.3176 0.0058 0.0439 0.0002 0.0524 0.0009 277 1 280 5
6477.1.04 6 144 0.34 0.3192 0.0082 0.0443 0.0002 0.0523 0.0013 279 2 281 7
6477.1.05 26 495 0.27 0.6066 0.0082 0.0443 0.0002 0.0993 0.0013 280 1 481 7
6477.1.06 8 178 0.40 0.3218 0.0074 0.0440 0.0002 0.0530 0.0012 278 2 283 7
6477.1.07 19 434 0.33 0.3211 0.0033 0.0443 0.0002 0.0526 0.0005 279 2 283 3
6477.1.08 21 471 0.33 0.3181 0.0030 0.0443 0.0003 0.0520 0.0005 280 2 280 3
6477.1.09 18 393 0.34 0.3166 0.0052 0.0445 0.0002 0.0516 0.0008 281 1 279 5
6477.1.10 15 344 0.44 0.3166 0.0037 0.0438 0.0003 0.0524 0.0006 276 2 279 3
6477.1.11 22 475 0.47 0.3151 0.0036 0.0441 0.0003 0.0519 0.0006 278 2 278 3
6477.1.12 10 224 0.38 0.3152 0.0055 0.0440 0.0003 0.0519 0.0009 278 2 278 5
6477.1.13 18 403 0.42 0.3115 0.0038 0.0436 0.0003 0.0518 0.0006 275 2 275 3
6477.1.14 20 464 0.33 0.3149 0.0035 0.0438 0.0003 0.0522 0.0005 276 2 278 3
6477.1.15 16 357 0.31 0.3128 0.0043 0.0437 0.0003 0.0520 0.0007 275 2 276 4
6477.1.16 6 132 0.39 0.3118 0.0116 0.0437 0.0003 0.0517 0.0019 276 2 276 10
6477.1.17 11 234 0.28 0.3177 0.0089 0.0444 0.0003 0.0519 0.0016 280 2 280 8
6477.1.18 10 223 0.25 0.3164 0.0151 0.0438 0.0003 0.0524 0.0025 276 2 279 13
6477.1.19 10 213 0.26 0.3158 0.0057 0.0441 0.0003 0.0519 0.0010 278 2 279 5
6477.1.20 6 141 0.30 0.3170 0.0090 0.0444 0.0003 0.0518 0.0015 280 2 280 8
6477.1.21 9 191 0.28 0.3165 0.0059 0.0442 0.0003 0.0519 0.0010 279 2 279 5
6477.1.22 22 485 0.28 0.3182 0.0034 0.0442 0.0002 0.0522 0.0005 279 2 281 3
6477.1.23 12 280 0.26 0.3166 0.0040 0.0442 0.0003 0.0519 0.0006 279 2 279 4
6477.1.24 23 507 0.28 0.3170 0.0034 0.0443 0.0002 0.0519 0.0005 279 2 280 3
样品：TW6907-1;岩性：花岗闪长岩 6907.1.01 5 104 0.49 0.3118 0.0138 0.0436 0.0003 0.0519 0.0023 275 2 276 12
6907.1.02 5 110 0.51 0.3150 0.0126 0.0440 0.0003 0.0520 0.0020 277 2 278 11
6907.1.03 6 118 0.59 0.3186 0.0122 0.0439 0.0003 0.0526 0.0020 277 2 281 11
6907.1.04 7 130 0.64 0.3139 0.0089 0.0440 0.0003 0.0517 0.0014 278 2 277 8
6907.1.05 6 116 0.45 0.3125 0.0107 0.0438 0.0003 0.0517 0.0017 276 2 276 9
6907.1.06 5 101 0.49 0.3165 0.0113 0.0442 0.0003 0.0519 0.0019 279 2 279 10
6907.1.07 4 80 0.47 0.3156 0.0152 0.0440 0.0003 0.0520 0.0025 278 2 279 13
6907.1.08 3 68 0.62 0.3143 0.0182 0.0441 0.0003 0.0517 0.0030 278 2 277 16
6907.1.09 5 105 0.65 0.3148 0.0109 0.0441 0.0003 0.0517 0.0018 278 2 278 10
6907.1.10 4 94 0.60 0.3149 0.0127 0.0441 0.0003 0.0518 0.0020 278 2 278 11
6907.1.11 4 86 0.61 0.3171 0.0118 0.0442 0.0003 0.0521 0.0020 279 2 280 10
6907.1.12 5 111 0.58 0.3136 0.0099 0.0440 0.0003 0.0517 0.0016 278 2 277 9
6907.1.13 6 134 0.65 0.3147 0.0071 0.0441 0.0003 0.0517 0.0012 278 2 278 6
6907.1.14 4 90 0.63 0.3154 0.0100 0.0442 0.0003 0.0517 0.0016 279 2 278 9
6907.1.15 5 97 0.67 0.3155 0.0113 0.0441 0.0003 0.0519 0.0018 278 2 278 10
6907.1.16 4 94 0.67 0.3193 0.0113 0.0443 0.0003 0.0522 0.0018 280 2 281 10
6907.1.17 4 97 0.63 0.3160 0.0113 0.0441 0.0003 0.0520 0.0019 278 2 279 10
6907.1.18 5 118 0.63 0.3187 0.0098 0.0442 0.0003 0.0524 0.0016 279 2 281 9
6907.1.19 6 128 0.79 0.3148 0.0079 0.0441 0.0003 0.0517 0.0013 278 2 278 7
6907.1.20 4 91 0.63 0.3156 0.0097 0.0443 0.0003 0.0517 0.0016 279 2 279 9
6907.1.21 6 145 0.44 0.3147 0.0149 0.0440 0.0003 0.0519 0.0024 278 2 278 13
6907.1.22 5 105 0.67 0.3153 0.0084 0.0441 0.0003 0.0518 0.0014 278 2 278 7
6907.1.23 4 90 0.63 0.3132 0.0112 0.0442 0.0003 0.0514 0.0018 279 2 277 10
6907.1.24 5 118 0.59 0.3148 0.0151 0.0440 0.0003 0.0519 0.0024 278 2 278 13
图3 花岗闪长岩部分锆石CL图像
Fig.3 CL images of selected zircon grains
图4 TW6477-1， TW6907-1锆石U-Pb测年谐和图和加权平均年龄图
Fig.4 Zircon U-Pb condordia and weighted average age diagrams for TW6477-1 and TW6907-1
表2 花岗闪长岩锆石 Hf同位素组成
Table 2 Hf isotopic compositions for zircons of granodiorite
样品和岩性 样点号 T/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σm εHf(0) εHf(t) 2σ T DM1/Ma T D M C /Ma f Lu/Hf
样品：TW6477.1岩性：花岗闪长岩 6 477.1.01 278 0.0269 0.0011 0.282512 0.000031 9.2 -3.3 1.1 1 505 2 020 -0.97
6 477.1.03 278 0.0217 0.0009 0.282489 0.000023 10.0 -4.1 0.8 1 554 2 090 -0.97
6 477.1.04 278 0.0173 0.0007 0.282391 0.000023 13.5 -7.5 0.8 1 770 2 396 -0.98
6 477.1.05 278 0.0226 0.0010 0.282512 0.000026 9.2 -3.2 0.9 1 502 2 016 -0.97
6 477.1.06 278 0.0211 0.0009 0.282456 0.000026 11.2 -5.2 0.9 1 626 2 192 -0.97
6 477.1.07 278 0.0217 0.0009 0.282419 0.000023 12.5 -6.6 0.8 1 711 2 312 -0.97
6 477.1.09 278 0.0185 0.0008 0.282424 0.000024 12.3 -6.3 0.9 1 697 2 293 -0.98
6 477.1.10 278 0.0274 0.0011 0.282485 0.000025 10.1 -4.2 0.9 1 564 2 105 -0.97
6 477.1.11 278 0.0278 0.0011 0.282485 0.000023 10.1 -4.2 0.8 1 564 2 105 -0.97
6 477.1.12 278 0.0346 0.0014 0.282479 0.000022 10.4 -4.5 0.8 1 581 2 128 -0.96
6 477.1.13 278 0.0256 0.0011 0.282489 0.000021 10.0 -4.1 0.7 1 555 2 091 -0.97
6 477.1.14 278 0.0172 0.0007 0.282423 0.000021 12.4 -6.4 0.7 1 699 2 297 -0.98
6 477.1.15 278 0.0184 0.0008 0.282485 0.000023 10.2 -4.2 0.8 1 561 2 100 -0.98
6 477.1.16 278 0.0200 0.0008 0.282407 0.000024 12.9 -7.0 0.9 1 737 2 349 -0.97
6 477.1.17 278 0.0224 0.0009 0.282424 0.000024 12.3 -6.4 0.8 1 700 2 297 -0.97
6 477.1.18 278 0.0145 0.0006 0.282445 0.000022 11.6 -5.6 0.8 1 649 2 225 -0.98
6 477.1.19 278 0.0172 0.0007 0.282496 0.000025 9.7 -3.8 0.9 1 534 2 062 -0.98
6 477.1.20 278 0.0208 0.0009 0.282405 0.000021 13.0 -7.0 0.7 1 741 2 355 -0.97
6 477.1.21 278 0.0182 0.0008 0.282444 0.000022 11.6 -5.6 0.8 1 652 2 229 -0.98
6 477.1.24 278 0.0215 0.0009 0.282515 0.000025 9.1 -3.1 0.9 1 494 2 005 -0.97
样品：TW6907.1岩性：花岗闪长岩 6 907.1.01 278 0.0215 0.0007 0.282558 0.000022 7.6 -1.6 0.8 1 396 1 866 -0.98
6 907.1.02 278 0.0228 0.0006 0.282536 0.000023 8.3 -2.4 0.8 1 445 1 935 -0.98
6 907.1.03 278 0.0225 0.0007 0.282584 0.000021 6.7 -0.7 0.7 1 339 1 785 -0.98
6 907.1.04 278 0.0208 0.0007 0.282513 0.000021 9.2 -3.2 0.7 1 497 2 009 -0.98
6 907.1.05 278 0.0242 0.0005 0.282580 0.000020 6.8 -0.8 0.7 1 344 1 792 -0.98
6 907.1.06 278 0.0175 0.0004 0.282545 0.000018 8.0 -2.0 0.6 1 423 1 904 -0.99
6 907.1.07 278 0.0196 0.0006 0.282550 0.000017 7.8 -1.8 0.6 1 413 1 889 -0.98
6 907.1.08 278 0.0193 0.0006 0.282541 0.000019 8.2 -2.2 0.7 1 434 1 919 -0.98
6 907.1.10 278 0.0193 0.0005 0.282585 0.000018 6.6 -0.6 0.6 1 334 1 778 -0.99
6 907.1.11 278 0.0183 0.0005 0.282532 0.000021 8.5 -2.5 0.7 1 452 1 945 -0.99
6 907.1.12 278 0.0170 0.0004 0.282569 0.000018 7.2 -1.1 0.6 1 369 1 827 -0.99
6 907.1.13 278 0.0276 0.0008 0.282472 0.000021 10.6 -4.7 0.7 1 590 2 142 -0.98
6 907.1.14 278 0.0174 0.0005 0.282467 0.000019 10.8 -4.8 0.7 1 598 2 152 -0.98
6 907.1.16 278 0.0208 0.0005 0.282505 0.000017 9.4 -3.4 0.6 1 513 2 032 -0.98
6 907.1.18 278 0.0240 0.0006 0.282488 0.000019 10.0 -4.0 0.7 1 552 2 087 -0.98
6 907.1.20 278 0.0161 0.0005 0.282567 0.000019 7.3 -1.3 0.7 1 375 1 836 -0.98
表3 花岗闪长岩主量元素的质量百分含量 (%)和微量元素 (×10-6)分析结果
Table 3 Major (wt.%) and trace elements (×10 -6) data of granodiorite
岩性 沙日楚鲁岩体 莫若古岩体
编号 6477-1 P8-1 P8-2 P8-3 P8-4 6907-1 P15-1 P15-2 P15-3
SiO2 65.37 67.58 67.88 66.34 65.02 66.5 65.24 63.76 66.23
TiO2 0.63 0.45 0.42 0.56 0.65 0.53 0.53 0.62 0.48
Al2O3 15.64 15.53 15.47 16 16.43 15.68 16.18 16.06 16.23
Fe2O3 0.78 0.23 0.18 0.56 0.6 1.1 0.85 1.31 0.34
FeO 3.81 3.03 2.82 3.31 3.88 3.09 3.42 3.31 3.41
MnO 0.10 0.07 0.07 0.07 0.08 0.10 0.10 0.09 0.07
MgO 1.54 1.09 1 1.46 1.61 1.78 1.99 2.04 1.74
CaO 3.52 2.92 3.08 3.81 3.5 3.4 3.64 4.63 3.82
Na2O 2.83 3.23 3.25 2.85 302 3.11 3.38 3.1 3.64
K2O 3.83 4.05 3.94 4 3.66 3.51 2.74 3.26 2.82
P2O5 0.19 0.14 0.13 0.16 0.19 0.19 0.18 0.17 0.14
LOI 1.34 1.36 1.44 0.52 0.94 0.68 1.37 1.28 0.71
H2O 0.68 0.63 0.53 0.67 0.86 0.47 0.87 0.68 0.5
CO2 0.65 0.62 0.8 0.98 0.67 0.19 0.45 0.43 0.076
Total 99.58 99.68 99.68 99.64 99.58 99.67 99.62 99.63 99.63
K2O/Na2O 1.35 1.25 1.21 1.40 1.21 1.13 0.81 1.05 0.77
Mg# 39.40 39.08 38.98 42.17 40.96 45.39 47.53 46.40 47.14
A/CNK 1.03 1.03 1.02 1.00 1.07 1.04 1.07 0.94 1.02
Li 34.7 34.6 36.9 33 43 55.1 36.8 46 32.2
Sc 11.6 8.98 8.53 10.5 12 11.2 10.5 16.4 11.2
V 45.3 28.7 26.6 43.3 45.4 49.6 56.8 55.2 49
Cr 20 13.2 12.2 19 17.6 39 29.5 46.8 27.5
Co 7.6 6.65 6.55 8.69 9.08 10.7 9.2 12.6 9.25
Ni 6.83 3.59 3.69 5.48 4.74 11.5 12.8 11.2 10.6
Cu 10.8 5.79 3.9 10.1 9.68 12 14.9 9.29 7.32
Zn 50.3 43 42.8 62 66.6 58.2 52.5 58.7 50.4
Ga 18.2 17.1 16.8 17.6 19.4 17.9 18.8 18.1 17.7
Rb 129 157 151 140 142 144 122 130 112
Sr 300 282 271 312 314 311 549 312 471
Zr 220 139 158 161 184 153 144 164 147
Nb 9.43 8.18 8.3 7.27 8.57 8.71 6.91 9.14 7.01
Cs 5.34 24.8 17.6 10.5 17.6 11 3.26 8.15 5.26
Ba 696 596 444 844 778 638 671 720 774
Hf 6.15 4.84 5.46 5.09 5.88 4.52 4 5.17 4.65
Ta 0.85 1.02 1.26 0.71 0.9 0.83 0.52 0.82 0.57
Pb 25.7 33 61 36.1 30.3 28.8 26.9 27.6 34.1
Th 10.8 16.7 15.3 15 14.1 11.2 9.23 12.3 10.9
U 1.43 3.2 2.99 1.15 1.34 1.18 0.74 1.26 1.23
La 20.6 24.7 25.6 30.4 31.2 24.8 24.4 25.8 25.5
Ce 41.8 57.8 62.7 63.7 57.5 46.9 47.2 57.4 54.9
编号 6477-1 P8-1 P8-2 P8-3 P8-4 6907-1 P15-1 P15-2 P15-3
Pr 5.45 5.96 6.28 7.74 7.7 5.85 5.77 5.94 5.68
Nd 21 21.5 22.6 29.4 28.5 21.8 21.4 21.8 19.7
Sm 4.43 4.88 5.33 5.67 5.5 4.18 3.85 4.57 4.04
Eu 1.26 0.98 1 1.41 1.42 1.07 1.09 1.27 1.1
Gd 4.22 4.8 5.1 4.56 4.85 3.72 3.51 4.5 3.66
Tb 0.76 0.79 0.89 0.8 0.89 0.55 0.5 0.66 0.54
Dy 4.54 4.61 5.35 4.47 5.14 2.97 2.64 3.82 2.81
Ho 0.94 0.97 1.11 0.86 1 0.58 0.51 0.76 0.55
Er 2.73 2.84 3.3 2.46 3 1.64 1.44 2.08 1.54
Tm 0.42 0.44 0.54 0.37 0.46 0.24 0.2 0.31 0.23
Yb 2.9 3.05 3.7 2.42 3.04 1.59 1.41 2.08 1.48
Lu 0.44 0.47 0.56 0.35 0.46 0.24 0.21 0.32 0.23
Y 26.2 24.6 29.5 21.9 26.1 16 13.9 18.8 13.7
LREE 94.54 115.82 123.51 138.32 131.82 104.60 103.71 116.78 110.92
HREE 43.15 42.57 50.05 38.19 44.94 27.53 24.32 33.33 24.74
ΣREE 137.69 158.39 173.56 176.51 176.76 132.13 128.03 150.11 135.66
σEu 0.88 0.61 0.58 0.82 0.82 0.81 0.89 0.85 0.86
(La/Yb)N 4.79 5.46 4.66 8.47 6.92 10.52 11.67 8.36 11.62
(Yb)N 13.88 14.59 17.70 11.58 14.55 7.61 6.75 9.95 7.08
Sr/Y 11.45 11.46 9.19 14.25 12.03 19.44 39.50 16.60 34.38
图5 花岗闪长岩岩石判别图解
Fig.5 Discrimination diagrams of the granodiorite
图6 花岗闪长岩稀土元素配分图和微量元素蛛网图
Fig.6 Chondrite-normalized REE parterns and primitive-mantle normalized trace element spider diagrams of the granodiorite
图7 花岗闪长岩 ε Hf ( t )-t 图解
Fig.7 ε Hf ( t )-t diagrams of granodiorite
图8 Sr/Y-Y(a)[ 51 ]和（La/Yb） N -YbN(b)图解[ 52 ]
Fig.8 Discrimination diagram of Sr/Y-Y(a)[ 51 ] and （La/Yb）N-YbN(b)[ 52 ]
图9 花岗闪长岩构造环境判别图解
Fig.9 Tectonic setting discrimination diagrams of the granodiorite
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