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东昆仑阿克楚克塞地区辉长岩地球化学特征、锆石U-Pb年龄及其构造意义

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杨锡铭, 孙丰月, 赵拓飞, 刘金龙, 彭勃. 东昆仑阿克楚克塞地区辉长岩地球化学特征、锆石U-Pb年龄及其构造意义[J]. 地质通报, 2018, 37(10): 1842-1852.
引用本文: 杨锡铭, 孙丰月, 赵拓飞, 刘金龙, 彭勃. 东昆仑阿克楚克塞地区辉长岩地球化学特征、锆石U-Pb年龄及其构造意义[J]. 地质通报, 2018, 37(10): 1842-1852.
shu
YANG Ximing, SUN Fengyue, ZHAO Tuofei, LIU Jinlong, PENG Bo. Zircon U-Pb dating, geochemistry and tectonic implications of Akechukesai gabbro in East Kunlun orogenic belt[J]. Geological Bulletin of China, 2018, 37(10): 1842-1852.
Citation: YANG Ximing, SUN Fengyue, ZHAO Tuofei, LIU Jinlong, PENG Bo. Zircon U-Pb dating, geochemistry and tectonic implications of Akechukesai gabbro in East Kunlun orogenic belt[J]. Geological Bulletin of China, 2018, 37(10): 1842-1852.
shu

东昆仑阿克楚克塞地区辉长岩地球化学特征、锆石U-Pb年龄及其构造意义

  • 1.

    吉林大学地球科学学院, 吉林 长春 130061

  • 2.

    中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110000

  • 3.

    中国地质科学院矿产资源研究所, 北京 100037

  • 基金项目:
    青海省地质调查局项目《青海省柴达木周缘铜镍硫化物矿床成矿规律及找矿预测研究》（编号：2017042004ky004）
详细信息
    作者简介: 杨锡铭(1993-), 男, 在读硕士生, 矿物学、矿床学、矿石学专业。E-mail:18243177359@163.com
    通讯作者: 孙丰月(1963-), 男, 博士, 教授, 从事矿床地质、成矿作用研究。E-mail:sfy@jlu.edu.cn

  • 中图分类号: P588.12+4;P597+.3

Zircon U-Pb dating, geochemistry and tectonic implications of Akechukesai gabbro in East Kunlun orogenic belt

  • 1.

    College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China

  • 2.

    Shenyang Center, China Geological Survey, Shenyang 110000, Liaoning, China

  • 3.

    Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

More Information

    摘要

  • 东昆仑地区基性-超基性岩石的研究较薄弱，缺乏对东昆仑幔源岩浆活动及岩浆演化的整体认识。对阿克楚克塞辉长岩进行了地球化学、锆石U-Pb年代学及Hf同位素研究，结果显示，该岩石形成于晚三叠世早期（219.3±1.1Ma，MSWD=0.80）；岩石SiO2含量为49.03%~57.26%，Mg#值为49~57，属于钙碱性系列岩石；稀土元素配分曲线为轻稀土元素富集的右倾型，富集大离子亲石元素Rb、Ba、K，相对亏损高场强元素Nb、Ta、Ti；εHf（t）=-1.81~3.25，锆石Hf模式年龄大于锆石结晶年龄。地球化学特征显示，阿克楚克塞辉长岩岩浆源区应为受俯冲板片流体交代的岩石圈地幔。结合区域构造背景分析，阿克楚克塞辉长岩形成于印支期造山后伸展的构造环境，继承了早期板片俯冲改造的地幔源区特征。

    The study of basite and ultrabasite in East Kunlun is relatively limited, which results in a lack of an overall understanding of mantle-source magmatic activities and magmatic evolution in East Kunlun. This paper presents geochemical, U-Pb chronological and Hf isotopic studies of gabbro in Akechukesai. The results indicate that the rock was formed in early Late Triassic(219.3±1.1Ma, MSWD=0.80). The rock belongs to calc-alkaline series. The content of SiO2 is 49.03%~57.26% and the values of Mg# are 49~57. The REE distribution curve shows right-dipping feature of LREE. The rock is enriched in LILE(Rb, Ba, K)and depleted in HFSE (Nb, Ta, Ti). The εHf(t)values vary from -1.81 to 3.25 and the Hf model age of zircon is older than the crystallizational age of zircon. Geochemical features of the rock indicate that the Akechukesai gabbro originated from partial melting of the metasomatized lithospheric mantle caused by the dehydration of the subducting slab. Combined with the analysis of regional tectonic setting, the authors hold that the Akechukesai gabbro was formed in an extensional regime of the Late Indosinian, inheriting the characteristics of mantle source altered by early subduction of slab.

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  • 图 1  阿克楚克塞区域大地构造简图[3]（a）和研究区地质图（b）

    Figure 1. 

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    图 2  阿克楚克塞辉长岩显微照片

    Figure 2. 

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    图 3  阿克楚克塞辉长岩锆石阴极发光（CL）图像

    Figure 3. 

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    图 4  阿克楚克塞辉长岩锆石U-Pb谐和图

    Figure 4. 

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    图 5  辉长岩TAS图解[17]（a）和SiO2-K2O图解[18]（b）

    Figure 5. 

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    图 6  阿克楚克塞辉长岩稀土元素球粒陨石标准化配分曲线图（a）[19]和原始地幔标准化微量元素蛛网图（b）[20]

    Figure 6. 

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    图 7  阿克楚克塞辉长岩Hf同位素图解[21-22]

    Figure 7. 

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    图 8  阿克楚克塞辉长岩TFeO-MgO-Al2O3图解（a）[34]和Hf/3-Th-Ta图解（b）[35]

    Figure 8. 

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    表 1  阿克楚克塞辉长岩（16AKCKS-1-N1）LA-MC-ICP-MS锆石U-Th-Pb同位素定年分析结果

    Table 1.  LA-MC-ICP-MS zircon U-Th-Pb dating results of sample 16AKCKS-1-N1 from Akechukesai gabbro

    点位 元素含量/10-6 Th/U 同位素比值 年龄/Ma
    Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
    1 420 401 1.05 0.0505 0.0009 0.2427 0.0051 0.0348 0.0005 219 42 221 4 220 3
    4 940 1617 0.58 0.0515 0.0007 0.2459 0.0037 0.0346 0.0005 262 31 223 3 220 3
    5 1708 3800 0.45 0.0515 0.0009 0.2458 0.0050 0.0346 0.0004 264 38 223 4 219 2
    6 957 800 1.20 0.0509 0.0007 0.2418 0.0040 0.0344 0.0005 238 30 220 3 218 3
    9 1163 900 1.29 0.0503 0.0007 0.2399 0.0043 0.0345 0.0004 209 34 218 4 219 3
    11 2000 6087 0.33 0.0511 0.0005 0.2483 0.0031 0.0352 0.0005 244 24 225 3 223 3
    12 797 768 1.04 0.0506 0.0010 0.2441 0.0054 0.0349 0.0004 224 44 222 4 221 2
    13 635 575 1.10 0.0514 0.0010 0.2425 0.0043 0.0342 0.0004 257 43 220 3 217 3
    14 0 1558 0 0.0510 0.0010 0.2477 0.0049 0.0352 0.0004 239 43 225 4 223 3
    15 1527 3080 0.50 0.0510 0.0007 0.2421 0.0034 0.0344 0.0005 243 31 220 3 218 3
    16 2220 1324 1.68 0.0511 0.0009 0.2443 0.0030 0.0347 0.0005 247 39 222 2 220 3
    18 918 733 1.25 0.0510 0.0006 0.2443 0.0033 0.0347 0.0003 239 27 222 3 220 2
    19 1462 993 1.47 0.0512 0.0009 0.2404 0.0043 0.0340 0.0003 251 38 219 3 216 2
    21 283 301 0.94 0.0508 0.0012 0.24177 0.0059 0.0346 0.0003 230 56 220 5 219 2
    22 251 271 0.93 0.0496 0.0013 0.24021 0.0065 0.0351 0.0004 176 62 219 5 222 2
    23 485 498 0.97 0.0511 0.0009 0.24331 0.0046 0.0346 0.0002 244 41 221 4 219 1
    24 448 423 1.06 0.0504 0.0013 0.23943 0.0062 0.0345 0.0004 212 62 218 5 219 2
    下载: 导出CSV

    表 2  阿克楚克塞辉长岩主量、微量和稀土元素分析结果

    Table 2.  Major elements, trace elements and REE concentrations of the Akechukesai gabbro

    样品编号 16AKCKS-1-Y1-1 16AKCKS-1-Y1-2 16AKCKS-1-Y1-3 16AKCKS-1-Y1-4 16AKCKS-1-Y1-5
    SiO2 47.64 50.82 51.40 55.97 48.12
    TiO2 1.59 1.04 0.91 0.65 1.05
    Al2O3 16.94 20.03 20.12 16.57 17.54
    MnO 0.18 0.13 0.12 0.13 0.17
    MgO 5.80 3.63 3.27 3.84 6.11
    CaO 10.35 9.05 8.90 8.60 10.13
    Na2O 2.86 3.44 3.52 2.97 3.33
    K2O 1.93 1.88 2.30 2.81 1.09
    P2O5 0.25 0.32 0.20 0.24 0.12
    TFe2O3 9.61 7.23 6.65 5.96 9.11
    烧失量 2.62 1.84 2.09 1.50 2.59
    总计 97.15 97.57 97.40 97.74 96.76
    La 22.54 25.98 17.11 31.16 16.64
    Ce 45.80 47.75 30.73 56.30 28.67
    Pr 5.41 5.64 3.66 6.57 3.35
    Nd 22.77 23.89 15.67 27.41 13.27
    Sm 4.68 4.84 3.29 5.81 2.89
    Eu 1.61 1.73 1.48 1.48 0.99
    Gd 5.06 5.09 3.56 6.14 2.82
    Tb 0.67 0.67 0.48 0.86 0.46
    Dy 3.87 3.76 2.79 4.86 2.66
    Ho 0.73 0.71 0.52 0.92 0.55
    Er 2.10 2.01 1.53 2.69 1.46
    Tm 0.28 0.27 0.21 0.37 0.19
    Yb 1.83 1.68 1.34 2.40 1.31
    Lu 0.26 0.24 0.19 0.33 0.19
    Y 19.20 18.34 15.36 27.70 12.50
    ΣREE 117.60 124.25 82.56 147.30 75.45
    LREE 102.81 109.83 71.95 128.73 65.81
    HREE 14.79 14.41 10.61 18.57 9.64
    LREE/HREE 6.95 7.62 6.78 6.93 6.82
    （La/Yb）N 8.32 10.40 8.60 8.75 8.56
    δEu 1.00 1.06 1.31 0.75 1.05
    δCe 0.97 0.91 0.89 0.90 0.87
    Cs 5.36 8.41 6.74 3.57 7.05
    Rb 128.76 91.08 102.18 111.82 64.76
    Ba 380.71 472.74 396.46 663.72 210.74
    Th 1.93 3.48 2.87 8.27 3.42
    U 0.84 0.68 0.56 1.15 1.06
    Nb 7.97 8.11 5.71 7.57 4.15
    Ta 0.34 0.34 0.26 0.41 0.23
    K 16084.57 15666.18 19149.38 23523.26 9091.933
    Pb 6.50 15.52 10.01 9.83 9.46
    Sr 577.54 670.00 601.23 483.69 460.97
    P 1111.02 1409.11 894.77 1055.37 535.92
    Zr 53.00 58.20 39.16 86.80 67.23
    Hf 1.47 1.53 1.09 2.26 1.67
    Ti 9576.13 6276.32 5475.95 3895.52 6310.78
    Sc 23.20 15.25 13.28 18.75 23.54
    V 303.20 178.90 144.70 130.00 157.35
    Cr 110.54 41.99 49.04 63.57 135.61
    Mn 1403.39 1024.20 930.51 990.73 1377.07
    Co 31.86 25.02 19.08 20.30 26.02
    Ni 50.90 29.60 23.12 28.14 35.58
    Cu 12.23 14.67 14.49 16.62 10.21
    Zn 100.31 60.84 46.93 41.98 94.77
    注：主量元素含量单位为%，稀土和微量元素含量为10-6
    下载: 导出CSV

    表 3  阿克楚克赛辉长岩Hf同位素分析结果

    Table 3.  Zircon Hf isotopic compositions of the Akechusai gabbro

    点号 t /Ma 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ εHf （0） εHf（t） 2σ tDM1/Ma tDM2/Ma fLu/Hf
    1 220 0.080605 0.000559 0.001609 0.000013 0.282676 0.000019 -3.4 1.2 0.7 830 1177 -0.95
    4 220 0.027226 0.000078 0.000620 0.000001 0.282623 0.000019 -5.3 -0.5 0.7 881 1286 -0.98
    5 219 0.126196 0.001662 0.002596 0.000028 0.282645 0.000030 -4.5 0.0 1.1 897 1255 -0.92
    9 219 0.099150 0.002275 0.001982 0.000048 0.282641 0.000024 -4.6 -0.1 0.8 889 1260 -0.94
    11 223 0.160456 0.003339 0.003265 0.000058 0.282596 0.000023 -6.2 -1.8 0.8 988 1370 -0.90
    12 221 0.075851 0.000254 0.001547 0.000003 0.282706 0.000021 -2.3 2.3 0.8 785 1109 -0.95
    16 220 0.156747 0.002172 0.003063 0.000036 0.282740 0.000025 -1.1 3.2 0.9 768 1046 -0.91
    18 220 0.103134 0.000766 0.002052 0.000015 0.282717 0.000023 -2.0 2.6 0.8 780 1089 -0.94
    19 216 0.116287 0.002945 0.002305 0.000060 0.282702 0.000022 -2.5 1.9 0.8 807 1126 -0.93
    20 211 0.056081 0.000533 0.001161 0.000012 0.282598 0.000023 -6.2 -1.7 0.8 930 1353 -0.97
    21 219 0.055959 0.000086 0.001130 0.000001 0.282623 0.000021 -5.3 -0.6 0.7 894 1292 -0.97
    22 222 0.076007 0.000632 0.001552 0.000012 0.282701 0.000022 -2.5 2.1 0.8 792 1118 -0.95
    23 219 0.072205 0.001062 0.001528 0.000014 0.282625 0.000022 -5.2 -0.6 0.8 901 1292 -0.95
    24 219 0.075165 0.000576 0.001527 0.000011 0.282661 0.000024 -3.9 0.7 0.9 849 1210 -0.95
    下载: 导出CSV
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收稿日期:  2018-05-15
修回日期:  2018-08-22
刊出日期:  2018-10-25

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