• 中文核心期刊
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新疆东昆仑阿克苏库勒蛇绿岩地球化学特征和形成时限——来自辉长岩岩墙和枕状玄武岩的证据

杨有生, 陈邦学, 朱志新, 周能武, 陈甜

杨有生, 陈邦学, 朱志新, 周能武, 陈甜. 2018: 新疆东昆仑阿克苏库勒蛇绿岩地球化学特征和形成时限——来自辉长岩岩墙和枕状玄武岩的证据. 地质通报, 37(2-3): 369-381.
引用本文: 杨有生, 陈邦学, 朱志新, 周能武, 陈甜. 2018: 新疆东昆仑阿克苏库勒蛇绿岩地球化学特征和形成时限——来自辉长岩岩墙和枕状玄武岩的证据. 地质通报, 37(2-3): 369-381.
YANG Yousheng, CHEN Bangxue, ZHU Zhixin, ZHOU Nengwu, CHEN Tian. 2018: Geochemical characteristics and formation age of Aksukule ophiolite: Evidence from gabbro dyke and pillow basalt in East Kunlun, Xinjiang. Geological Bulletin of China, 37(2-3): 369-381.
Citation: YANG Yousheng, CHEN Bangxue, ZHU Zhixin, ZHOU Nengwu, CHEN Tian. 2018: Geochemical characteristics and formation age of Aksukule ophiolite: Evidence from gabbro dyke and pillow basalt in East Kunlun, Xinjiang. Geological Bulletin of China, 37(2-3): 369-381.

新疆东昆仑阿克苏库勒蛇绿岩地球化学特征和形成时限——来自辉长岩岩墙和枕状玄武岩的证据

基金项目: 

中国地质调查局项目《昆仑-阿尔金成矿带地质矿产调查》 1212011220640

详细信息
    作者简介:

    杨有生(1987-), 男, 学士, 工程师, 从事地质矿产工作。E-mail:xjdkj11yys@163.com

    通讯作者:

    陈邦学(1986-), 男, 硕士, 工程师, 从事区域地质矿产勘查。E-mail:674620069@qq.com

  • 中图分类号: P591

Geochemical characteristics and formation age of Aksukule ophiolite: Evidence from gabbro dyke and pillow basalt in East Kunlun, Xinjiang

  • 摘要:

    康西瓦-苏巴什-鲸鱼湖混杂岩带作为昆仑造山带一条重要的混杂岩带,通常被认为是古特提斯洋的残存带,其形成时限一直受到地质界的密切关注。在该带新识别出一套蛇绿岩,采用LA-ICP-MS锆石U-Pb测年,获得该蛇绿岩铁镁质单元中辉长岩的年龄为270.3±0.7Ma(MSWD=0.65),枕状玄武岩年龄为263.4±7.4Ma(MSWD=1.5),属于晚二叠世,代表蛇绿岩的形成年龄。通过岩石地球化学特征、区域背景等分析,认为其形成于洋中脊环境,属于典型的MORB型蛇绿岩。结合主量、微量元素特征、构造环境及同位素年龄讨论,认为古特提斯洋主洋盆至少持续到晚二叠世。

    Abstract:

    As an important mélange zone in the Kunlun orogenic belt, the Kangxiwa-Subas-Whalelake belt is regarded as the remnant zone of the Paleo-Tethys Ocean, and its formation has been closely monitored by the geological community. A new set of ophiolites was identified in the belt by LA-ICP-MS zircon U-Pb dating. The authors found that the age of gabbro from the magnesian units in the ophiolite is 270.3±0.7Ma (MSWD=0.65), and the age of pillow basalt is 263.4±7.4Ma (MSWD=1.5), which belongs to the Late Permian and represents the age of ophiolite formation. Based on the analysis of rock geochemical characteristics and regional background, it is considered that the ophiolite was formed in the mid-ocean ridge environment and belongs to the typical MORB type ophiolite. Based on the characteristics of main, trace elements, tectonic setting and isotopic age, the authors hold that the PaleoTethys oceanic basin continued to exist at least until Late Permian.

  • 图  1   昆仑造山带岩浆构造简图

    —前寒武纪花岗岩;2—寒武纪花岗岩;3—奥陶纪花岗岩;4—志留纪花岗岩;5—石炭纪花岗岩;6—三叠纪花岗岩;7—蛇绿岩及编号;8—公路及地名;9—主要边界断裂;10—采样点

    Figure  1.   Tectonic and magma map in Kunlun area

    图  2   研究区区域地质图

    1—第四系;2—古新统路乐河组;3—白垩系犬牙沟组;4—中二叠统马尔争组;5—中下二叠统树维门科组;6—枕状玄武岩;7—灰岩透镜体;8—硅质岩透镜体;9—辉长岩;10—实测/推测断层;11—不整合接触;12—侵入接触;13—产状;14—采样位置/实测剖面

    Figure  2.   Regional geological map of the study area

    图  3   蛇绿岩剖面

    1—砾岩;2—钙质细粒岩屑砂岩;3—玄武岩;4—杏仁状玄武岩;5—辉长岩;6—凝灰岩;7—硅质岩;8—断层;0—不整合界线;10—整合接触界限线;P1-2sh—中下二叠统树维门科组

    Figure  3.   Geological section of ophiolite

    图版Ⅰ  

    a.枕状玄武岩露头;b.灰绿色枕状玄武岩露头;c.灰绿色弱蚀变辉长岩;d.灰绿色枕状玄武岩(正交光)显微照片;e.灰绿色枕状玄武岩(单偏光)显微照片;f.灰绿色弱蚀变辉长岩显微照片(正交光)。Aug—普通辉石;Pl—斜长石

    图版Ⅰ.  

    图  4   Nb/Y-Zr/TiO2×10-4[33] (a)、SiO2-(Na2O+K2O)[34](b)和蛇绿岩Al2O3-CaO-MgO[36](c)图解

    Figure  4.   Nb/Y-Zr/TiO2×10-4(a), SiO2-(Na2O+K2O)(b) and Al2O3-CaO-MgO(c) diagrams

    图  5   稀土元素球粒陨石标准化配分模式图(a)和微量元素原始地幔标准化蛛网图(标准化数据据参考文献[36])

    E-MORB—富集型洋中脊玄武岩;N-MORB—正常型洋中脊玄武岩;OIB—洋岛玄武岩

    Figure  5.   Chondrite-normalized REE patterns (a) and primitive mantle-normalized spidergrams of trace elements (b)

    图  6   锆石阴极发光照片

    Figure  6.   Cathodoluminescence image of zircon

    图  7   锆石U-Pb年龄谐和图

    Figure  7.   U-Pb concordia diagrams of zircon

    图  8   玄武岩构造环境判别

    a—TiO2-MnO*10-P2O5*10图解[45];b—Ti/100-Zr-Y*3图解[46];c—Zr-Zr/Y图解[47];d—Ti-Zr图解[46](d);CAB—大陆弧玄武岩;IAT—岛弧拉斑玄武岩;OIT—洋岛弧拉斑玄武岩;OIA—洋岛碱性玄武岩;LKT—低钾拉斑玄武岩;WPB—板内玄武岩;MORB—洋中脊玄武岩

    Figure  8.   Tectonic Setting discrimination diagrams of basalts

    图  9   源区判别图解[48]

    Figure  9.   Magma derivation plots

    表  1   阿克苏库勒蛇绿构造混杂岩各组成单元

    Table  1   The constituent elements of the Aksukule ophiolitic tectonic mélange

    组成单元 主要岩性 备注
    外来岩块残片 上叠盆地沉积岩 主要为白垩系犬牙沟组、古近系路乐河组陆相沉积砾岩、碎屑岩岩块 K1q、El
    蛇绿岩上覆岩系残片 上覆岩系为洋岛火山碎屑岩(OIB),其次洋脊玄武岩之上的远洋硅质岩或火山灰尘凝灰岩及少量深水沉积碳酸岩(少量钙质砂岩等) Ca(P2) si(P2)
    蛇绿岩残片 镁铁质火山杂岩单元枕状玄武岩、球颗玄武岩等 席状岩墙单元辉长辉绿岩、辉绿岩 v(P2)
      注:K1q—白垩系犬牙沟组;El—古近系路乐河组;Ca(P2)—二叠系钙质砂岩;si(P2)—二叠系硅质岩;β(P2)—二叠系玄武岩;ν(P2)—二叠系辉绿岩
    下载: 导出CSV

    表  3   锆石U-Th-Pb年龄分析结果

    Table  3   Zircon U-Th-Pb dating results

    测点 同位素比值 表面年龄/Ma
    232Th/238U 207Pb/206Pb 207Pb/235U Pb/206U238 207Pb/206Pb 207Pb/235U Pb/206U238
    1311AY-P20-1-TW1
    1 0.36 0.0546 0.0021 0.4771 0.0174 0.0634 0.0007 395 63 396 12 396 4
    2 0.63 0.0515 0.0090 0.3111 0.0537 0.0438 0.0014 265 304 275 42 276 8
    3 0.11 0.0672 0.0030 1.2645 0.0545 0.1366 0.0019 843 67 830 24 825 11
    4 0.38 0.0522 0.0010 0.3009 0.0051 0.0418 0.0003 295 25 267 4 264 2
    5 0.73 0.0512 0.0040 0.2580 0.0198 0.0366 0.0006 248 147 233 16 231 3
    6 0.32 0.0552 0.0032 0.4865 0.0273 0.0637 0.0010 421 98 403 19 399 6
    7 0.07 0.0670 0.0084 1.2569 0.1554 0.1360 0.0033 838 222 826 70 822 19
    8 0.32 0.0520 0.0012 0.2978 0.0062 0.0415 0.0003 286 33 265 5 262 2
    10 0.33 0.0555 0.0010 0.4935 0.0084 0.0646 0.0005 430 24 407 6 403 3
    11 0.98 0.0549 0.0037 0.5177 0.0338 0.0684 0.0012 406 115 424 23 427 7
    12 0.74 0.0517 0.0027 0.3064 0.0149 0.0428 0.0005 279 89 271 12 270 3
    14 0.21 0.0558 0.0015 0.5296 0.01340 0.0689 0.0006 435 45 407 9 403 4
    15 0.63 0.0558 0.0015 0.5296 0.01340 0.0689 0.0006 444 40 432 9 429 4
    1311AY-LY-TW1
    1 1.83 0.0426 0.0002 0.3021 0.0106 0.0426 0.0002 262 79 268 9 269 1
    2 1.92 0.043 0.0002 0.3041 0.0099 0.043 0.0002 256 71 270 9 271 2
    3 1.32 0.0427 0.0002 0.3036 0.0048 0.0427 0.0002 266 36 269 4 270 1
    4 1.11 0.0327 0.0002 0.3778 0.0127 0.0327 0.0002 1288 63 325 11 207 1
    5 1.10 0.043 0.0002 0.307 0.0072 0.043 0.0002 276 53 272 6 271 1
    6 1.38 0.0431 0.0002 0.3077 0.0065 0.0431 0.0002 274 48 272 6 272 1
    7 1.38 0.0426 0.0002 0.3047 0.0057 0.0426 0.0002 277 42 270 5 269 1
    8 0.79 0.1333 0.0007 1.3032 0.0181 0.1333 0.0007 955 28 847 12 807 4
    9 0.69 0.0428 0.0002 0.3055 0.01 0.0428 0.0002 274 74 271 9 270 2
    10 0.93 0.0427 0.0002 0.3065 0.0057 0.0427 0.0002 286 42 271 5 270 1
    11 1.01 0.0427 0.0002 0.3057 0.0063 0.0427 0.0002 284 46 271 6 269 1
    12 1.12 0.0428 0.0002 0.3045 0.0057 0.0428 0.0002 266 42 270 5 270 1
    13 1.08 0.0426 0.0002 0.3057 0.0068 0.0426 0.0002 286 49 271 6 269 1
    14 0.78 0.0209 0.0001 0.2184 0.008 0.0209 0.0001 1088 72 201 7 133 1
    15 1.01 0.0427 0.0002 0.3039 0.0079 0.0427 0.0002 270 59 269 7 269 1
    16 1.22 0.0427 0.0002 0.3042 0.0052 0.0427 0.0002 271 37 270 5 270 1
    17 1.39 0.0429 0.0002 0.3056 0.0073 0.0429 0.0002 273 54 271 6 271 1
    18 0.75 0.1175 0.0006 1.0795 0.0111 0.1175 0.0006 826 21 743 8 716 4
    19 1.52 0.0432 0.0003 0.3038 0.0102 0.0432 0.0003 243 73 269 9 272 2
    20 1.24 0.0429 0.0002 0.3055 0.0087 0.0429 0.0002 269 65 271 8 271 1
    21 1.28 0.0431 0.0002 0.3069 0.0071 0.0431 0.0002 270 52 272 6 272 1
    22 1.85 0.045 0.0002 0.4984 0.0131 0.045 0.0002 1204 50 411 11 284 1
    23 1.28 0.0471 0.0003 0.6408 0.0269 0.0471 0.0003 1599 76 503 21 297 2
    24 1.35 0.0494 0.0003 0.812 0.0269 0.0494 0.0003 1946 52 604 20 311 2
    下载: 导出CSV

    表  2   样品主量、微量和稀土元素分析结果

    Table  2   The major, trace and rare earth elements analytical results of samples

    样品号 1311AY-P21-3 1311AY-P21-4 1311AY-L2015-2 1311AY-P20-5 1311AY-P20-1-1 1311AY-P20-1-4 1311AY-PZT-1 1311AY-P21-5 1311AY-L2015-1 1311AY-AYL-1
    岩石名称 枕状玄武岩 枕状玄武岩 枕状玄武岩 枕状玄武岩 枕状玄武岩 枕状玄武岩 枕状玄武岩 蚀变辉长岩 蚀变辉长岩 蚀变辉长岩
    SiO2 52.5 52.44 48.82 52.21 48.46 50.74 50.76 51.92 48.28 50.53
    TiO2 0.97 1.38 1.64 0.98 1.01 1 1.31 0.9 1.66 0.22
    Al2O3 15.19 14.68 13.87 15.54 15.72 14.85 15.19 16.11 13.75 15.29
    Fe2O3 1.78 2.64 4.31 1.64 2.13 2.12 2.37 1.56 5.3 9.43
    FeO 5.43 6.4 8 5.4 5.58 5.35 5.92 5.15 7 6.9
    MnO 0.14 0.17 0.22 0.13 0.14 0.14 0.16 0.13 0.21 0.15
    MgO 6.9 5.83 6.66 7.39 7.55 6.84 5.94 7.2 6.7 7.9
    CaO 10.41 9.46 8.93 8.13 10.59 10 9.92 9.85 8.96 8.37
    Na2O 2.38 3.44 3.46 3.72 3 3.11 2.98 3.46 3.4 3.17
    K2O 0.64 0.42 0.48 0.99 0.87 0.27 0.36 0.5 0.62 0.68
    P2O5 0.11 0.16 0.14 0.11 0.11 0.11 0.16 0.11 0.15 0.15
    烧失量 3.23 2.86 3 2.84 4.82 4.86 4.04 2.94 3.16 3.48
    Sr 170 184 150 137 81.35 151 206 164 144 243
    Rb 14.58 12.73 8.46 24.07 30 9.16 13.3 17.9 15.85 122
    Ba 93.66 125 97.35 134 67.09 107 218 85.34 98.7 365
    Th 2.9 3.8 0.45 4.7 2.5 2.1 2.9 4.6 0.68 10.29
    U 1 1.3 1.2 1.1 1 1 1.2 0.7 1.2 1.2
    Ta 0.28 0.43 0.4 0.48 0.3 0.45 0.38 0.46 0.29 1.77
    Nb 7.61 9.63 6.43 7.29 5.56 7.37 6.69 6.74 6 8.72
    Zr 94.71 138 111 114 84.66 104 137 109 118 138
    Y 23 32.7 30.3 23.3 22.5 20.6 30.3 15.9 30.1 29.6
    Hf 2.31 3.47 3.17 2.77 2.1 2.88 3.59 2.64 3.43 4.28
    Ti 5820 8280 9840 5880 6060 6000 7860 5400 9960 1320
    La 7.5 11.2 4.5 12.5 6.5 7.4 8.7 10.2 4.3 10.7
    Ce 16.2 23.8 11.6 25.8 15.2 15.8 20 19.4 11.4 22.6
    Pr 2.3 3.4 2 3.3 2.3 2.3 2.9 2.5 1.9 3.2
    Nd 10.8 15.3 10.4 14.1 10.3 10.8 13.6 10.2 9.8 14
    Sm 3 4.3 3.3 3.5 3 2.8 3.9 2.4 3.3 3.9
    Eu 1 1.3 1.2 1.1 1 1 1.2 0.7 1.2 1.2
    Gd 3.4 4.7 3.9 3.6 3.2 2.9 4.3 2.4 3.7 4.3
    Tb 0.66 0.93 0.82 0.74 0.66 0.6 0.86 0.46 0.78 0.86
    Dy 4.3 5.8 5.5 4.5 4.3 3.9 5.9 2.8 5.6 5.3
    Ho 0.95 1.3 1.2 0.95 0.93 0.85 1.2 0.64 1.2 1.2
    Er 2.5 3.5 3.4 2.6 2.6 2.2 3.4 1.8 3.4 3.3
    Tm 0.41 0.56 0.54 0.41 0.42 0.37 0.57 0.3 0.56 0.51
    Yb 2.8 3.9 3.7 2.7 2.6 2.5 3.6 2 3.9 3.3
    Lu 0.41 0.56 0.61 0.43 0.41 0.4 0.58 0.35 0.61 0.5
    ΣREE 56.23 80.55 52.67 76.23 53.42 53.82 70.71 56.15 51.65 74.87
    LREE/HREE 2.64 2.79 1.68 3.79 2.53 2.92 2.46 4.22 1.62 2.89
    δEu 0.95 0.88 1.02 0.94 0.98 1.06 0.89 0.88 1.05 0.89
    (La/Yb)N 1.92 2.06 0.87 3.32 1.79 2.12 1.73 3.66 0.79 2.33
    (La/Sm)N 1.61 1.68 0.88 2.31 1.40 1.71 1.44 2.74 0.84 1.77
    (Gd/Yb)N 1.00 1.00 0.87 1.10 1.02 0.96 0.99 0.99 0.78 1.08
    注:主量元素含量单位为%,微量和稀土元素含量为10-6
    下载: 导出CSV
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  • 收稿日期:  2016-12-11
  • 修回日期:  2017-03-03
  • 网络出版日期:  2023-08-15
  • 刊出日期:  2018-02-28

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