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    青海省赛支寺花岗闪长岩及其暗色包体成因:锆石U-Pb年代学、岩石地球化学和Sr-Nd-Hf同位素制约

    崔加伟 郑有业 孙祥 吴松 高顺宝 田立明 孙君一 杨超

    崔加伟, 郑有业, 孙祥, 吴松, 高顺宝, 田立明, 孙君一, 杨超, 2016. 青海省赛支寺花岗闪长岩及其暗色包体成因:锆石U-Pb年代学、岩石地球化学和Sr-Nd-Hf同位素制约. 地球科学, 41(7): 1156-1170. doi: 10.3799/dqkx.2016.515
    引用本文: 崔加伟, 郑有业, 孙祥, 吴松, 高顺宝, 田立明, 孙君一, 杨超, 2016. 青海省赛支寺花岗闪长岩及其暗色包体成因:锆石U-Pb年代学、岩石地球化学和Sr-Nd-Hf同位素制约. 地球科学, 41(7): 1156-1170. doi: 10.3799/dqkx.2016.515
    Cui Jiawei, Zheng Youye, Sun Xiang, Wu Song, Gao Shunbao, Tian Liming, Sun Junyi, Yang Chao, 2016. Origin of Granodiorite and Mafic Microgranular Enclave in Saizhisi, Qinghai Province: Zircon U-Pb Geochronological, Geochemical and Sr-Nd-Hf Isotopic Constraints. Earth Science, 41(7): 1156-1170. doi: 10.3799/dqkx.2016.515
    Citation: Cui Jiawei, Zheng Youye, Sun Xiang, Wu Song, Gao Shunbao, Tian Liming, Sun Junyi, Yang Chao, 2016. Origin of Granodiorite and Mafic Microgranular Enclave in Saizhisi, Qinghai Province: Zircon U-Pb Geochronological, Geochemical and Sr-Nd-Hf Isotopic Constraints. Earth Science, 41(7): 1156-1170. doi: 10.3799/dqkx.2016.515

    青海省赛支寺花岗闪长岩及其暗色包体成因:锆石U-Pb年代学、岩石地球化学和Sr-Nd-Hf同位素制约

    doi: 10.3799/dqkx.2016.515
    基金项目: 

    青海省甘德县青珍矿产远景调查项目 12120113031400

    详细信息
      作者简介:

      崔加伟(1990-),男,博士生,主要从事矿床学、区域地质调查等研究.E-mail:1cuijiawei1@163.com

      通讯作者:

      郑有业, E-mail: zhyouye@163.com

    • 中图分类号: P581

    Origin of Granodiorite and Mafic Microgranular Enclave in Saizhisi, Qinghai Province: Zircon U-Pb Geochronological, Geochemical and Sr-Nd-Hf Isotopic Constraints

    • 摘要: 祁连造山带分为南祁连、中祁连和北祁连构造带.赛支寺岩体位于中祁连与南祁连构造带的结合部位.首次发现了赛支寺花岗闪长岩及其暗色包体,然而对于暗色包体的成因机理以及与寄主岩石之间的成因联系仍存在很多争议.并对其进行了系统的锆石U-Pb年代学、Lu-Hf同位素、岩石地球化学以及Sr-Nd同位素地球化学研究,探讨赛支寺岩体及其暗色包体的成因及动力学背景.LA-ICP-MS锆石U-Pb年代学表明,赛支寺花岗闪长岩形成于446.1±1.3 Ma,包体形成于446.0±1.0 Ma,两者在误差范围内一致,排除了包体为捕虏体成因.暗色包体具较低的SiO2含量、较高的Na2O/K2O比值,低Sr/Y、La/Yb比值,与寄主岩稀土配分曲线基本一致,但LREE相对较低;86Sr/87Sr=0.706 4~0.706 7,εNd(t)=-7.38~-7.97;发育针状磷灰石,形成于岩浆混合作用.寄主岩SiO2=66.45%~68.12%,Na2O/K2O=0.80~0.97,A/CNK=0.91~1.03,显示准铝质-弱过铝质岩浆特点;富集大离子亲石元素Rb、Th、U、K,亏损Nb、Ta等元素,高Sr/Y、La/Yb比值,轻稀土富集,弱负Eu异常;86Sr/87Sr=0.709 3~0.709 5,εNd(t)=-1.75~-1.03,与祁连造山带I型花岗岩相似;锆石εHf(t)=1.7~6.8,TDM2=995~1 750 Ma.综上所述认为,寄主花岗闪长岩形成于壳幔岩浆混合.结合区域地质背景,赛支寺花岗闪长岩形成于俯冲背景下,幔源岩浆上涌,侵入到下地壳中,造成下地壳物质熔融,由这种既有幔源物质又有古老地壳物质的花岗岩岩浆形成.

       

    • 图  1  研究区地质简图及采样位置

      Song et al.(2006, 2007)、吴才来等(2006, 2010)、陈隽璐等(2008)雍拥等(2008)Wu et al.(2011)熊子良等(2012)秦海鹏等(2014)

      Fig.  1.  Sketch geological map and sampling sites of the igneous rocks in Saizhisi

      图  2  赛支寺花岗闪长岩及包体

      a.包体野外照片;b.花岗闪长岩照片;c.包体镜下照片;d.花岗闪长岩镜下照片;Pl.斜长石;Ap.磷灰石;Hb.角闪石;Q.石英

      Fig.  2.  Photos of Saizhisi granodiorite and MMEs

      图  3  六道沟组锆石锆石阴极发光图像

      Fig.  3.  Cathodoluminescence images of Saizhisi pluton

      图  4  锆石U-Pb年龄谐和图

      a.寄主岩;b.暗色包体

      Fig.  4.  U-Pb zircon concordia diagram

      图  5  锆石Hf同位素演化

      吴才来等(2010)Wu et al.(2011)秦海鹏(2014)赵辛敏等(2014)

      Fig.  5.  Hf evolution of zircon

      图  6  赛支寺花岗闪长岩QAP图解

      Fig.  6.  The QAP nomenclature diagram of the Saizhisi granodiorite

      图  7  赛支寺花岗闪长岩SiO2-K2O关系

      图例同图 6

      Fig.  7.  The relation of SiO2-K2O of granitic plutons

      图  8  赛支寺花岗闪长岩A/NK-A/CNK关系

      图例同图 6

      Fig.  8.  The relation of A/NK-A/CNK of granitic plutons

      图  9  花岗闪长岩球粒陨石标准化稀土元素配分曲线

      Fig.  9.  Chondrite-normalized REE patterns of granitoids

      Sun and McDonough(1989)

      图  10  花岗闪长岩球粒陨石标准化微量元素蛛网图

      Fig.  10.  Primitive mantle normalized trace elements patterns of granitoids

      Sun and McDonough(1989)

      图  11  87Sr-86Sr-εNd(t)关系

      吴才来等(2010)熊子良等(2012)Chen et al.(2015)

      Fig.  11.  The relation of 87Sr-86Sr-εNd(t)

      图  12  86Sr/87Sr和εNd(t)与SiO2关系

      图例同图 6;FC.分离结晶作用;AFC.岩浆同化混染-结晶分离作用

      Fig.  12.  The realtion of 86Sr/87Sr and εNd(t) vs. SiO2

      图  13  Ga/Al-K2O+Na2O和Ga/Al-TFeO/MgO判别图解

      Whalen et al.(1987);图例同图 6;A.A型花岗岩;I-S.I-S型花岗岩

      Fig.  13.  The discrimination diagram of Ga/Al-K2O+Na2O and Ga/Al-TFeO/MgO

      图  14  SiO2-P2O5关系

      Fig.  14.  The relation of SiO2-P2O5

      图  15  赛支寺花岗闪长岩Nb-Y和Ta-Y构造环境判别图解

      Pearce et al.(1984)

      Fig.  15.  The discrimination diagram of Nb-Y and Ta-Y

      表  1  赛支寺岩体及锆石锆石U-Pb年龄测定结果

      Table  1.   U-Pb zircon LA-ICP-MS chronological data of samples

      样品 组成(10-6) Th/U 元素比值 年龄(Ma)
      Pb Th U 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
      PM2-1 111.26 458.38 1 243.44 0.37 0.059 03 0.000 94 0.620 21 0.007 96 0.076 23 0.000 45 0.030 05 0.000 28 568 18 490 5 474 3
      PM2-2 116.13 460.42 1 414.74 0.33 0.058 36 0.000 8 0.577 45 0.005 83 0.071 78 0.000 4 0.028 94 0.000 21 543 13 463 4 447 2
      PM2-3 56.40 227.43 668.95 0.34 0.056 2 0.000 88 0.555 98 0.006 99 0.071 78 0.000 42 0.027 96 0.000 26 460 18 449 5 447 3
      PM2-4 114.75 460.60 1 387.70 0.33 0.061 11 0.000 87 0.598 6 0.006 51 0.071 07 0.000 4 0.031 11 0.000 25 643 14 476 4 443 2
      PM2-5 94.64 444.84 1 089.32 0.41 0.068 19 0.001 02 0.672 47 0.007 83 0.071 55 0.000 42 0.034 59 0.000 28 874 15 522 5 445 3
      PM2-6 100.34 359.11 1 237.84 0.29 0.059 93 0.000 85 0.591 42 0.006 31 0.071 6 0.000 4 0.030 52 0.000 25 601 14 472 4 446 2
      PM2-7 75.19 258.02 881.80 0.29 0.062 6 0.000 92 0.617 15 0.007 02 0.071 53 0.000 41 0.033 61 0.000 29 695 15 488 4 445 2
      PM2-8 136.41 732.26 1 575.51 0.46 0.060 71 0.000 8 0.601 13 0.005 61 0.071 84 0.000 39 0.029 79 0.000 19 629 11 478 4 447 2
      PM2-9 148.61 770.48 1 709.55 0.45 0.067 66 0.001 27 0.669 85 0.010 81 0.071 83 0.000 48 0.032 28 0.000 35 858 22 521 7 447 3
      PM2-10 73.04 350.14 879.34 0.40 0.060 66 0.000 95 0.600 18 0.007 55 0.071 79 0.000 42 0.025 97 0.000 24 627 17 477 5 447 3
      PM2-11 125.14 612.79 1 437.01 0.43 0.064 7 0.000 88 0.639 76 0.006 33 0.071 74 0.000 4 0.030 19 0.000 21 765 12 502 4 447 2
      PM2-12 141.06 779.01 1 624.11 0.48 0.064 63 0.000 82 0.637 38 0.005 53 0.071 56 0.000 38 0.028 4 0.000 17 762 10 501 3 446 2
      PM2-13 100.47 402.27 1 245.61 0.32 0.059 81 0.001 15 0.592 6 0.009 89 0.071 89 0.000 47 0.028 88 0.000 36 597 25 473 6 448 3
      PM2-14 87.45 64.80 528.94 0.12 0.068 04 0.000 95 1.344 46 0.017 15 0.143 31 0.000 82 0.043 62 0.000 44 870 30 865 7 863 5
      PM3-1 13.48 86.73 149.76 0.58 0.059 86 0.001 43 0.595 37 0.012 91 0.072 16 0.000 53 0.024 14 0.000 30 599 34 474 8 449 3
      PM3-2 29.22 308.30 311.00 0.99 0.060 35 0.001 36 0.597 27 0.012 10 0.071 81 0.000 51 0.021 40 0.000 22 616 31 475 8 447 3
      PM3-3 47.96 720.48 487.75 1.48 0.056 69 0.001 08 0.558 91 0.009 23 0.071 53 0.000 46 0.020 52 0.000 15 479 25 451 6 445 3
      PM3-4 51.54 630.77 498.69 1.26 0.057 65 0.000 90 0.570 93 0.007 16 0.071 86 0.000 41 0.022 35 0.000 14 516 18 459 5 447 2
      PM3-5 11.19 74.43 129.99 0.57 0.057 26 0.001 69 0.567 07 0.015 70 0.071 86 0.000 59 0.022 00 0.000 36 502 46 456 10 447 4
      PM3-6 35.39 368.27 357.48 1.03 0.062 66 0.001 26 0.621 36 0.010 94 0.071 95 0.000 48 0.024 13 0.000 21 697 26 491 7 448 3
      PM3-7 44.12 530.80 466.15 1.14 0.056 89 0.001 76 0.561 07 0.016 86 0.071 53 0.000 50 0.022 23 0.000 11 487 70 452 11 445 3
      PM3-8 38.61 415.04 407.75 1.02 0.057 82 0.001 14 0.571 51 0.009 84 0.071 72 0.000 47 0.023 97 0.000 20 523 26 459 6 447 3
      PM3-9 11.27 76.87 128.70 0.60 0.058 34 0.001 56 0.576 27 0.014 24 0.071 67 0.000 55 0.025 17 0.000 35 543 41 462 9 446 3
      PM3-10 16.36 115.15 184.67 0.62 0.058 02 0.001 36 0.574 37 0.012 17 0.071 83 0.000 51 0.024 10 0.000 30 531 34 461 8 447 3
      PM3-11 23.15 214.63 251.05 0.85 0.058 16 0.001 43 0.575 87 0.012 95 0.071 84 0.000 53 0.023 84 0.000 27 536 36 462 8 447 3
      注:锆石U-Pb测年在中国科学院青藏高原研究所大陆碰撞与高原隆升重点实验室完成.
      下载: 导出CSV

      表  2  赛支寺花岗闪长岩锆石Hf同位素分析结果

      Table  2.   Zircon Hf isotopic compositions of the Saizhisi granodiorite

      样品 176Hf/177Hf 1σ 176Lu/177Hf 1σ 176Yb/177Hf 1σ εHf(0) 1σ εHf(t) 1σ TDM1 TDM2 fLu/Hf
      PM2-01 0.282 702 0.000 040 0.001 547 0.000 038 0.038 456 0.001 020 -2.5 1.5 6.8 1.5 791 922 -0.95
      PM2-02 0.282 561 0.000 021 0.000 838 0.000 011 0.022 730 0.000 320 -7.5 0.9 2.1 0.9 973 1 185 -0.97
      PM2-03 0.282 551 0.000 027 0.000 701 0.000 006 0.017 996 0.000 349 -7.8 1.1 1.7 1.1 985 1 204 -0.98
      PM2-04 0.282 596 0.000 024 0.001 009 0.000 045 0.027 996 0.001 321 -6.2 1.0 3.2 1.0 929 1 121 -0.97
      PM2-05 0.282 573 0.000 020 0.000 706 0.000 019 0.017 304 0.000 427 -7.0 0.9 2.5 0.9 954 1 161 -0.98
      PM2-06 0.282 586 0.000 019 0.000 984 0.000 023 0.025 761 0.000 564 -6.6 0.8 2.9 0.9 942 1 140 -0.97
      PM2-07 0.282 577 0.000 024 0.000 905 0.000 016 0.024 071 0.000 512 -6.9 1.0 2.6 1.0 952 1 156 -0.97
      PM2-08 0.282 621 0.000 023 0.001 145 0.000 011 0.031 073 0.000 447 -5.3 1.0 4.0 1.0 897 1 074 -0.97
      PM2-09 0.282 671 0.000 023 0.001 372 0.000 066 0.039 828 0.002 039 -3.6 1.0 5.8 1.0 831 980 -0.96
      PM2-10 0.282 651 0.000 021 0.001 092 0.000 020 0.031 508 0.000 817 -4.3 0.9 6.2 0.9 853 995 -0.97
      PM2-11 0.282 614 0.000 021 0.001 184 0.000 014 0.036 508 0.000 514 -5.6 0.9 3.8 0.9 908 1 089 -0.96
      PM2-12 0.282 604 0.000 027 0.000 808 0.000 025 0.023 468 0.000 753 -5.9 1.1 3.5 1.1 913 1 102 -0.98
      PM2-14 0.282 597 0.000 022 0.001 048 0.000 025 0.029 330 0.000 787 -6.2 0.9 3.8 0.9 928 1 109 -0.97
      注:锆石Hf同位素中国地质大学(武汉)地质过程与矿产资源国家重点实验室完成.
      下载: 导出CSV

      表  3  赛支寺岩体及包体主量元素(%)和微量元素(10-6)分析结果

      Table  3.   The major (%) and trace (10-6) element analysis of Bayankala Group

      样品样号 寄主岩 包体
      PM4-3-GXW1 PM4-3-GXW2 PM4-3-GXW3 P2-1GXW1 P2-1GXW2 P2-1GXW3 P1-0GXW1 P1-0GXW2 P1-0GXW3
      SiO2 67.35 67.17 68.12 67.14 66.62 66.45 52.35 53.70 55.02
      TiO2 0.50 0.49 0.43 0.51 0.58 0.54 0.77 0.86 0.77
      Al2O3 14.70 14.82 14.52 14.45 13.93 14.19 16.91 16.26 15.37
      Fe2O3 1.54 1.69 1.57 1.58 1.26 1.72 3.59 4.19 4.87
      FeO 1.92 1.88 1.63 2.05 2.60 2.05 4.85 5.50 5.60
      MgO 1.80 1.85 1.62 1.98 2.11 2.06 4.41 5.66 5.41
      MnO 0.07 0.06 0.07 0.07 0.08 0.07 0.18 0.24 0.22
      CaO 2.02 2.38 3.01 2.96 3.02 2.88 6.94 7.21 6.17
      Na2O 3.81 3.61 3.59 3.74 3.49 3.45 3.88 3.47 3.70
      K2O 3.99 3.92 4.22 4.06 3.60 4.30 1.44 1.58 1.51
      P2O5 0.27 0.27 0.23 0.28 0.31 0.30 0.16 0.28 0.25
      烧失量 1.52 1.35 1.91 0.66 0.85 0.87 1.1 1.57 1.59
      TFeO 3.31 3.40 3.04 3.47 3.73 3.59 8.08 9.27 9.98
      Na2O/K2O 0.95 0.92 0.85 0.92 0.97 0.80 2.69 2.19 2.45
      A/NCK 1.03 1.02 0.91 0.91 0.92 0.91 0.82 0.79 0.81
      Mg# 49.20 49.21 48.72 50.49 50.25 50.58 49.33 52.12 49.13
      钙长石(An) 8.32 10.12 10.96 10.65 11.91 10.63 27.05 26.11 22.6
      石英(Q) 25.24 25.64 24.5 23.17 25.47 23.53 5.61 7.19 9.41
      钠长石(Ab) 34.23 32.43 31.78 33.33 31.64 31.04 38.23 33.48 35.71
      正长石(Or) 25.62 25.17 26.7 25.86 23.33 27.65 10.14 10.89 10.42
      σ 2.50 2.35 2.43 2.52 2.13 2.56 3.03 2.38 2.26
      La 81.82 80.14 77.19 81.28 90.26 85.38 23.14 30.64 26.79
      Ce 141.2 139.6 132.3 139.4 156.3 148.2 44.41 68.69 51.27
      Pr 16.50 16.10 15.20 15.64 17.87 16.76 5.38 9.36 6.34
      Nd 56.71 55.08 51.62 53.78 61.54 56.74 20.59 37.67 23.97
      Sm 8.92 8.51 7.93 8.23 9.60 8.54 4.02 7.51 4.82
      Eu 2.06 2.09 1.94 1.89 2.11 1.98 1.23 1.59 1.29
      Gd 6.53 6.19 5.68 6.34 7.26 6.63 3.77 6.32 4.32
      Tb 0.970 0.913 0.851 0.896 1.04 0.939 0.653 1.04 0.735
      Dy 4.85 4.56 4.10 4.35 4.97 4.48 3.76 5.76 4.26
      Ho 0.893 0.817 0.753 0.797 0.904 0.826 0.769 1.16 0.875
      Er 2.20 2.07 1.94 2.03 2.31 2.06 2.12 3.19 2.42
      Tm 0.327 0.318 0.286 0.301 0.346 0.308 0.325 0.503 0.381
      Yb 2.18 2.02 1.85 1.89 2.19 1.98 2.13 3.28 2.50
      Lu 0.319 0.309 0.277 0.289 0.333 0.306 0.347 0.514 0.425
      LREE 307.20 301.55 286.19 300.23 337.66 317.58 98.77 155.44 114.46
      HREE 18.26 17.19 15.74 16.89 19.37 17.53 13.87 21.77 15.92
      LREE/HREE 16.82 17.54 18.19 17.77 17.44 18.12 7.12 7.14 7.19
      (La/Yb)N 25.31 26.78 28.12 29.01 27.75 29.10 7.33 6.29 7.21
      (La/Sm)N 5.77 5.92 6.12 6.21 5.91 6.29 3.62 2.57 3.50
      (Gd/Yb)N 2.42 2.48 2.48 2.71 2.67 2.70 1.43 1.55 1.39
      δEu 0.79 0.84 0.84 0.77 0.74 0.78 0.95 0.69 0.84
      Rb 120.70 94.78 98.96 126.20 116.90 112.90 41.56 47.22 60.55
      Ba 1053.73 1092.70 1296.55 935.80 800.41 1093.66 405.00 352.50 354.00
      Th 32.34 33.80 29.26 29.97 32.04 32.80 1.66 2.67 3.24
      U 5.06 7.28 5.04 3.70 3.78 3.92 0.38 1.11 1.66
      Nb 26.50 24.71 20.05 25.32 29.20 26.97 9.48 13.82 7.97
      Ta 2.10 1.91 1.29 1.94 2.06 1.95 0.74 0.86 0.50
      Sr 769.15 758.20 781.40 725.55 702.57 724.04 474.52 458.21 496.32
      Hf 7.48 6.93 6.09 7.05 7.85 7.43 6.25 5.97 4.07
      Zr 244.80 237.10 210.10 235.50 265.80 250.90 90.40 117.60 80.50
      Y 22.92 21.84 20.20 20.52 23.82 21.82 20.14 29.12 22.29
      Cr 24.94 25.84 18.19 35.91 46.27 41.07 22.29 45.25 86.59
      Ni 17.81 18.22 15.14 22.33 24.55 23.88 23.71 27.70 24.64
      Ga/Al 1.77 1.94 1.88 2.35 2.22 2.16 2.20 2.23 2.21
      注:主微量元素在国土资源部武汉矿产资源监督检测中心完成.
      下载: 导出CSV

      表  4  赛支寺寄主岩及包体样品的Sr-Nd同位素组成

      Table  4.   Sr-Nd isotopic results of mafic microgranular enclaves and hosts rocks of the Saizhisi pluton

      87Sr/86Sr 87Rb/86Sr (87Sr/86Sr)t 2σ 143Nd/144Nd εNd(t) 2σ
      寄主 PM2-1 0.710 262 0.503 4 0.709 3 0.000 016 0.512 255 -7.467 062 528 0.000 009
      PM2-3 0.710 249 0.481 5 0.709 4 0.000 013 0.512 260 -7.379 476 356 0.000 009
      PM2-3 0.710 316 0.451 3 0.709 5 0.000 012 0.512 230 -7.967 415 603 0.000 010
      包体 PM3-1 0.706 847 0.253 4 0.706 4 0.000 016 0.512 581 -1.114 821 765 0.000 009
      PM3-2 0.707 046 0.298 1 0.706 5 0.000 015 0.512 585 -1.030 161 635 0.000 009
      PM3-3 0.707 354 0.353 0 0.706 7 0.000 014 0.512 548 -1.751 723 438 0.000 010
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