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    东昆仑按纳格角闪辉长岩体地球化学特征及其对古特提斯洋演化的制约

    赵旭 付乐兵 魏俊浩 赵玉京 唐洋 杨宝荣 管波 王晓云

    赵旭, 付乐兵, 魏俊浩, 赵玉京, 唐洋, 杨宝荣, 管波, 王晓云, 2018. 东昆仑按纳格角闪辉长岩体地球化学特征及其对古特提斯洋演化的制约. 地球科学, 43(2): 354-370. doi: 10.3799/dqkx.2018.020
    引用本文: 赵旭, 付乐兵, 魏俊浩, 赵玉京, 唐洋, 杨宝荣, 管波, 王晓云, 2018. 东昆仑按纳格角闪辉长岩体地球化学特征及其对古特提斯洋演化的制约. 地球科学, 43(2): 354-370. doi: 10.3799/dqkx.2018.020
    Zhao Xu, Fu Lebing, Wei Junhao, Zhao Yujing, Tang Yang, Yang Baorong, Guan Bo, Wang Xiaoyun, 2018. Geochemical Characteristics of An'nage Hornblende Gabbro from East Kunlun Orogenic Belt and Its Constraints on Evolution of Paleo-Tethys Ocean. Earth Science, 43(2): 354-370. doi: 10.3799/dqkx.2018.020
    Citation: Zhao Xu, Fu Lebing, Wei Junhao, Zhao Yujing, Tang Yang, Yang Baorong, Guan Bo, Wang Xiaoyun, 2018. Geochemical Characteristics of An'nage Hornblende Gabbro from East Kunlun Orogenic Belt and Its Constraints on Evolution of Paleo-Tethys Ocean. Earth Science, 43(2): 354-370. doi: 10.3799/dqkx.2018.020

    东昆仑按纳格角闪辉长岩体地球化学特征及其对古特提斯洋演化的制约

    doi: 10.3799/dqkx.2018.020
    基金项目: 

    中国地质调查局项目 12120114081401

    中国地质调查局项目 12120114000701

    中央高校基本科研业务费专项资金 CUGL170413

    国家自然科学基金项目 41302065

    详细信息
      作者简介:

      赵旭(1994-), 男, 博士研究生, 主要从事矿床地球化学、成矿规律与成矿预测研究

      通讯作者:

      付乐兵

    • 中图分类号: P597

    Geochemical Characteristics of An'nage Hornblende Gabbro from East Kunlun Orogenic Belt and Its Constraints on Evolution of Paleo-Tethys Ocean

    • 摘要: 目前关于东昆仑地区二叠纪-三叠纪基性岩浆岩的研究极为薄弱, 这不仅限制了对该时期东昆仑地区地幔源区性质的理解, 也在一定程度上制约了对古特提斯洋演化历史的准确认识.对东昆仑东段按纳格角闪辉长岩体进行了锆石U-Pb年代学、全岩地球化学和Sr-Nd-Hf同位素研究.结果显示:角闪辉长岩的锆石U-Pb定年结果为242±2 Ma; 岩体具有较低的SiO2(46.00%~52.40%)及(Na2O+K2O)含量(3.07%~3.79%), 碱度(δ)值为1.26~3.14;另外, 岩石具有较高的Al2O3(17.35%~20.10%), MgO(4.65%~6.53%)和FeOT(8.77%~11.07%)含量, Mg#值为68~75, 属于钙碱性系列.岩石(La/Yb)N为1.72~5.48, δEu为0.87~1.00, 具有弱的轻重稀土分异和负铕异常, 其富集大离子亲石元素, 亏损高场强元素, 具有低Nb/Ta值(3.7~8.8), 显示岛弧岩浆岩的地球化学特征.全岩(87Sr/86Sr)i值(0.708 80~0.710 36)和εNd(t)值(-4.8~-3.4)相对集中, 锆石εNd(t)值为-4.9~-0.4.综合分析表明, 岩浆起源于俯冲板片流体交代的地幔楔, 为尖晶石相金云母二辉橄榄岩的部分熔融产物, 岩浆在上升侵位过程中未遭受明显地壳混染, 但经历了少量单斜辉石和斜长石的分离结晶作用.综合区域构造演化史以及同时代岩浆岩的年代学和地球化学特征, 认为按纳格角闪辉长岩体侵位于古特提斯洋北向俯冲的晚期, 该区古特提斯洋的最终闭合时间为中-晚三叠世.

       

    • 图  1  东昆仑造山带构造位置(a)、岩浆岩分布(b)和按纳格角闪辉长岩体地质简图(c)

      图a据Xia et al.(2015a), 图b据Xia et al.(2015b)

      Fig.  1.  Geotectonic framework(a) and magmatite distribution(b) of East Kunlun orogenic belt, and simplified geological map of the An'nage hornblende gabbro(c)

      图  2  按纳格角闪辉长岩体镜下照片(正交光)

      Am.角闪石; Bi.黑云母; Pl.斜长石

      Fig.  2.  Microphotographs of An'nage hornblende gabbro

      图  3  按纳格角闪辉长岩体样品An2典型锆石阴极发光图像(CL)

      图中虚线圈和实线圈分别代表U-Pb和Hf同位素分析测试点; 括号外数值表示年龄, 括号内数值表示锆石Hf同位素组成

      Fig.  3.  Zircon cathodoluminescence(CL) images of sample An2 for An'nage hornblende gabbro

      图  4  按纳格角闪辉长岩锆石U-Pb年龄谐和图

      Fig.  4.  Zircon U-Pb concordia diagram for An'nage hornblende gabbro

      图  5  按纳格角闪辉长岩体TAS图解(a)和FeOT-FeOT/MgO图解(b)

      图a底图据Wison(1989); 图b底图据Miyashiro(1974); 白日其利镁铁质岩(251 Ma)数据据熊富浩等(2011)

      Fig.  5.  TAS diagram(a) and FeOT vs.FeOT/MgO diagram(b) for An'nage hornblende gabbro

      图  6  按纳格角闪辉长岩体哈克图解

      Fig.  6.  Harker diagrams for An'nage hornblende gabbro

      图  7  按纳格角闪辉长岩体球粒陨石标准化稀土元素分布模式(a)和原始地幔标准化微量元素蛛网图(b)

      Fig.  7.  The chondrite-normalized REE pattern(a) and PM-normalized trace element spider diagram(b) of An'nage hornblende gabbro

      图  8  按纳格角闪辉长岩体的εNd(t)-(87Sr/86Sr)i图解(a), Nd同位素图解(b), 锆石Hf同位素图解(c)和Hf同位素二阶段模式年龄直方图(d)

      图中白日其利镁铁质岩数据来源同图 5; a图中东昆仑基底数据来自陈宣华等(2011), 富集岩石圈地幔数据来自刘成东等(2003)以及熊富浩等(2011), 岩浆弧数据来自Xiong et al.(2012)刘成东等(2003)

      Fig.  8.  The εNd(t)-(87Sr/86Sr)i relations(a), Nd isotopic compositions(b), Hf isotopic compositions of zircons(c) and histogram of Hf isotopic two-stage model age(d) of An'nage hornblende gabbro

      图  9  按纳格角闪辉长岩体源区成分判别图解

      图a数据来自Furman and Graham(1999); 图c数据来自柴凤梅等(2007); 图d数据来自赵少卿等(2015); 图c和d中带短横线曲线为地幔岩浆熔融程度趋势线

      Fig.  9.  The discrimination diagrams of source composition for An'nage hornblende gabbro

      图  10  按纳格角闪辉长岩体Hf/3-Th-Nb/16(a)和Ti/100-Zr-Sr/2(b)构造环境判别图解

      图a底图据Wood et al.(1979); 图b底图据Pearce and Cann(1973)

      Fig.  10.  Hf/3-Th-Rb/16(a) and Ti/100-Zr-Sr/2(b) discrimination diagrams for An'nage hornblende gabbro

      表  1  按纳格角闪辉长岩锆石LA-ICP-MS U-Pb定年分析数据

      Table  1.   Zircon LA-ICP-MS U-Pb data of An'nage hornblende gabbro

      点号 Th(10-6) U(10-6) Th/U 同位素比值 年龄(Ma)
      207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ
      An2-1 166 128 1.30 0.074 81 0.002 61 0.394 59 0.015 03 0.038 27 0.000 59 0.011 31 0.000 45 1 064 69 338 11 242 4 227 9
      An2-2 146 124 1.18 0.051 58 0.001 71 0.271 33 0.009 99 0.038 17 0.000 56 0.012 75 0.000 50 267 74 244 8 242 3 256 10
      An2-3 46 49 0.94 0.056 86 0.004 13 0.300 69 0.021 89 0.038 37 0.000 81 0.013 70 0.000 70 486 153 267 17 243 5 275 14
      An2-4 99 108 0.91 0.053 26 0.002 07 0.280 41 0.011 69 0.038 20 0.000 58 0.012 06 0.000 52 340 85 251 9 242 4 242 10
      An2-5 282 160 1.76 0.067 25 0.002 64 0.350 68 0.014 70 0.037 83 0.000 60 0.012 12 0.000 53 846 80 305 11 239 4 244 11
      An2-6 227 179 1.27 0.052 06 0.002 27 0.274 84 0.012 63 0.038 30 0.000 61 0.011 54 0.000 54 288 97 247 10 242 4 232 11
      An2-7 383 268 1.43 0.050 25 0.001 33 0.265 62 0.008 23 0.038 35 0.000 53 0.011 48 0.000 52 207 60 239 7 243 3 231 10
      An2-08 442 342 1.29 0.059 45 0.001 69 0.314 34 0.010 26 0.038 36 0.000 54 0.012 58 0.000 60 584 61 278 8 243 3 253 12
      An2-09 114 97 1.17 0.051 35 0.002 09 0.270 21 0.011 70 0.038 18 0.000 59 0.012 14 0.000 62 256 91 243 9 242 4 244 12
      An2-10 421 219 1.93 0.051 77 0.001 56 0.276 53 0.009 41 0.038 75 0.000 55 0.011 59 0.000 60 275 68 248 7 245 3 233 12
      An2-11 266 157 1.69 0.051 43 0.002 60 0.273 35 0.014 24 0.038 55 0.000 64 0.012 12 0.000 41 260 112 245 11 244 4 244 8
      An2-12 346 224 1.54 0.056 81 0.001 48 0.298 47 0.009 03 0.038 11 0.000 51 0.012 20 0.000 38 484 56 265 7 241 3 245 8
      An2-13 206 108 1.90 0.060 45 0.003 02 0.318 83 0.016 36 0.038 25 0.000 65 0.012 61 0.000 46 620 104 281 13 242 4 253 9
      An2-14 187 119 1.57 0.062 93 0.003 16 0.330 72 0.017 03 0.038 12 0.000 66 0.012 83 0.000 50 706 103 290 13 241 4 258 10
      An2-15 138 135 1.02 0.058 67 0.002 45 0.307 74 0.013 51 0.038 05 0.000 59 0.012 33 0.000 50 555 89 272 10 241 4 248 10
      An2-16 163 145 1.13 0.053 87 0.001 75 0.283 48 0.010 15 0.038 17 0.000 54 0.012 29 0.000 49 366 72 253 8 242 3 247 10
      An2-17 206 195 1.05 0.050 82 0.001 39 0.265 47 0.008 35 0.037 89 0.000 52 0.012 10 0.000 50 233 62 239 7 240 3 243 10
      下载: 导出CSV

      表  2  按纳格角闪辉长岩主量元素(%)、微量元素(10-6)和稀土元素(10-6)分析结果

      Table  2.   Major elements(%), trace elements(10-6) and rare earth elements(10-6) results of An'nage hornblende gabbro

      样号 An1 An2 An3 An4 An5 An6
      SiO2 51.20 52.40 51.40 49.80 51.40 46.00
      Al2O3 18.20 17.95 18.25 17.45 17.35 20.10
      FeOT 8.92 8.77 10.04 11.07 10.10 8.86
      TiO2 0.82 1.08 1.07 1.12 1.16 0.92
      MnO 0.17 0.13 0.17 0.17 0.15 0.14
      MgO 5.82 4.65 5.53 5.95 5.71 6.53
      CaO 8.39 7.98 7.80 7.83 7.76 10.95
      BaO 0.03 0.03 0.03 0.03 0.03 0.03
      Na2O 2.21 2.37 2.48 2.04 2.34 2.05
      K2O 1.01 1.42 0.90 1.34 1.30 1.02
      P2O5 0.09 0.15 0.10 0.10 0.10 0.06
      LOI 2.04 2.39 1.57 2.40 1.69 2.55
      Total 99.06 99.49 99.58 99.61 99.32 99.37
      Na2O+K2O 3.22 3.79 3.38 3.38 3.64 3.07
      FeOT/MgO 1.53 1.89 1.82 1.86 1.77 1.36
      Mg# 72 68 69 68 69 75
      δ 1.26 1.53 1.36 1.68 1.58 3.14
      Li 33.8 35.3 23.9 15.1 13.9 12.5
      Be 1.56 2.12 1.81 0.69 0.77 0.46
      Sc 46.8 50.1 57.7 25.5 28.4 23.5
      V 381 537 623 293 278 186
      Cr 68.3 42.7 59.4 37.3 24.5 86.8
      Co 158.0 139.0 164.0 56.1 59.5 65.6
      Ni 73.3 66.2 83.1 33.7 27.8 45.3
      Cu 21.5 33.2 88.9 35.9 35.2 10.2
      Zn 223 225 283 124 145 109
      Ga 37.3 42.3 41.1 17.4 17.3 17.3
      Rb 74.3 105.0 69.6 43.7 45.5 33.2
      Sr 655 714 621 241 256 273
      Y 51.8 46.3 45.3 20.1 22.0 26.2
      Zr 171.0 129.0 143.0 46.8 48.8 51.7
      Nb 13.7 16.0 13.8 5.3 12.6 3.8
      Cs 3.5 6.1 3.5 2.1 2.7 1.6
      Ba 523 677 522 270 292 221
      La 26.9 35.3 29.8 10.6 12.8 6.1
      Ce 55.3 71.2 59.4 23.1 26.0 14.2
      Pr 7.2 9.0 7.2 2.9 3.2 2.1
      Nd 31.5 36.6 28.9 12.4 13.1 10.1
      Sm 7.9 7.9 6.9 3.0 3.2 3.1
      Eu 2.32 2.63 2.20 0.95 1.04 0.99
      Gd 8.4 7.9 7.4 3.3 3.6 3.8
      Tb 1.44 1.28 1.23 0.54 0.60 0.66
      Dy 8.7 7.7 7.5 3.3 3.7 4.3
      Ho 1.83 1.60 1.57 0.69 0.76 0.91
      Er 5.28 4.68 4.58 2.01 2.22 2.63
      Tm 0.77 0.68 0.66 0.29 0.32 0.38
      Yb 4.85 4.34 4.21 1.84 1.99 2.40
      Lu 0.73 0.65 0.64 0.28 0.30 0.36
      Hf 4.39 3.94 4.23 1.52 1.64 1.68
      Ta 3.71 1.82 2.37 0.73 1.72 0.82
      Tl 0.37 0.53 0.36 0.25 0.25 0.17
      Pb 11.0 16.2 12.2 5.1 5.9 4.7
      Th 5.9 7.0 9.2 2.4 2.9 0.8
      U 0.72 0.83 1.55 0.62 0.48 0.24
      ΣREE 215 238 208 85 95 78
      (La/Yb)N 3.74 5.48 4.77 3.88 4.34 1.72
      δEu 0.87 1.00 0.94 0.92 0.93 0.88
      注:FeOT为全铁含量; LOI为烧矢量; Mg#=100×Mg/(Ma+Fe), 原子个数之比; 碱度δ=(Na2O+K2O)2/(SiO2-43);δEu=2EuN/(SmN+GdN)(Sun and McDonough, 1989), 下标N为球粒陨石标准化值.
      下载: 导出CSV

      表  3  按纳格角闪辉长岩Sr-Nd同位素分析结果

      Table  3.   Sr-Nd isotopic compositions of An'nage hornblende gabbro

      样号 87Rb/86Sr 87Sr/86Sr 1σ (87Sr/86Sr)i 147Sm/144Nd 143Nd/144Nd 1σ εNd(t) tDM2(Ma)
      An1 0.328 0.710 48 0.000 02 0.709 35 0.151 418 0.512 369 0.000 006 -3.9 1 326
      An2 0.426 0.711 82 0.000 02 0.710 36 0.130 812 0.512 287 0.000 005 -4.8 1 405
      An3 0.324 0.710 02 0.000 02 0.708 91 0.143 496 0.512 381 0.000 006 -3.4 1 287
      An4 0.525 0.710 74 0.000 02 0.708 94 0.145 768 0.512 375 0.000 003 -3.6 1 303
      An5 0.514 0.710 56 0.000 04 0.708 80 0.148 593 0.512 388 0.000 006 -3.4 1 289
      注:εNd(t)值计算采用(147Sm/144Nd)CHUR=0.196 7, (143Nd/144Nd)CHUR=0.512 638;t代表成岩年龄(242 Ma); 同位素亏损地幔模式年龄tDM2计算采用(147Sm/144Nd)DM=0.213 7, (143Nd/144Nd)DM=0.513 15.
      下载: 导出CSV

      表  4  按纳格角闪辉长岩锆石Hf同位素分析结果

      Table  4.   Hf isotopic data for zircon samples from An'nage hornblende gabbro

      点号 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ t(Ma) εHf(0) εHf(t) tDM1(Ma) tDM2(Ma) fLu/Hf
      An2-1 0.037 146 0.001 727 0.282 583 0.000 020 242 -6.7 -1.6 965 1 153 -0.95
      An2-2 0.039 615 0.001 834 0.282 491 0.000 025 242 -9.9 -4.9 1100 1 318 -0.94
      An2-3 0.036 556 0.001 650 0.282 557 0.000 027 243 -7.6 -2.6 1001 1 200 -0.95
      An2-4 0.034 658 0.001 657 0.282 568 0.000 021 242 -7.2 -2.2 985 1 179 -0.95
      An2-5 0.034 797 0.001 571 0.282 576 0.000 019 239 -6.9 -1.9 972 1 165 -0.95
      An2-6 0.037 491 0.001 661 0.282 575 0.000 027 242 -7.0 -1.9 975 1 167 -0.95
      An2-7 0.064 186 0.002 795 0.282 572 0.000 027 243 -7.1 -2.2 1010 1 181 -0.92
      An2-8 0.022 967 0.001 044 0.282 590 0.000 034 243 -6.4 -1.3 938 1 136 -0.97
      An2-10 0.048 051 0.002 033 0.282 592 0.000 037 245 -6.4 -1.4 960 1 139 -0.94
      An2-11 0.051 703 0.002 161 0.282 619 0.000 037 244 -5.4 -0.4 925 1 092 -0.93
      An2-12 0.086 838 0.003 532 0.282 594 0.000 038 241 -6.3 -1.6 999 1 148 -0.89
      An2-13 0.043 328 0.001 806 0.282 611 0.000 036 242 -5.7 -0.7 927 1 103 -0.95
      An2-14 0.025 801 0.001 089 0.282 577 0.000 029 241 -6.9 -1.7 957 1 158 -0.97
      An2-15 0.041 244 0.001 818 0.282 522 0.000 036 241 -8.9 -3.8 1056 1 264 -0.95
      An2-16 0.053 913 0.002 218 0.282 571 0.000 025 242 -7.1 -2.1 996 1 179 -0.93
      An2-17 0.041 781 0.001 861 0.282 568 0.000 028 240 -7.2 -2.1 991 1 181 -0.94
      注:εHf(t)采用(176Lu/177Hf)CHUR=0.033 2和(176Hf/177Hf)CHUR, 0=0.282 772进行计算(Blichert-Toft et al., 1997), tDM采用(176Lu/177Hf)DM=0.038 4和(176Hf/177Hf)DM=0.283 25进行计算(Griffin et al., 2004), 176Lu衰变常数采用1.867×10-11 a-1(Söderlund et al., 2004).
      下载: 导出CSV
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    • 收稿日期:  2017-07-08
    • 刊出日期:  2018-02-15

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