内蒙古梅劳特乌拉蛇绿岩中早二叠世埃达克岩与古亚洲洋东段洋内俯冲

董培培, 李英杰, 王金芳, 李红阳. 内蒙古梅劳特乌拉蛇绿岩中早二叠世埃达克岩与古亚洲洋东段洋内俯冲[J]. 地质通报, 2020, 39(9): 1474-1487.
引用本文: 董培培, 李英杰, 王金芳, 李红阳. 内蒙古梅劳特乌拉蛇绿岩中早二叠世埃达克岩与古亚洲洋东段洋内俯冲[J]. 地质通报, 2020, 39(9): 1474-1487.
DONG Peipei, LI Yingjie, WANG Jinfang, LI Hongyang. The Early Permian adakite in the Meilaotewula ophiolite of Inner Mongolia and intra-oceanic subduction in eastern Palaeo-Asian Ocean[J]. Geological Bulletin of China, 2020, 39(9): 1474-1487.
Citation: DONG Peipei, LI Yingjie, WANG Jinfang, LI Hongyang. The Early Permian adakite in the Meilaotewula ophiolite of Inner Mongolia and intra-oceanic subduction in eastern Palaeo-Asian Ocean[J]. Geological Bulletin of China, 2020, 39(9): 1474-1487.

内蒙古梅劳特乌拉蛇绿岩中早二叠世埃达克岩与古亚洲洋东段洋内俯冲

详细信息
    作者简介: 董培培(1985-), 女, 硕士, 讲师, 从事岩石学和地球化学研究。E-mail:120650334@qq.com
    通讯作者: 李英杰(1976-), 女, 博士, 教授, 从事岩浆岩与大地构造研究。E-mail:liyingjie820@126.com
  • 中图分类号: P534.46;P588.1

The Early Permian adakite in the Meilaotewula ophiolite of Inner Mongolia and intra-oceanic subduction in eastern Palaeo-Asian Ocean

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  • 贺根山缝合带东部晚石炭世梅劳特乌拉SSZ型蛇绿岩中的埃达克岩,岩性为安山岩和英安岩。LA-ICP-MS锆石U-Pb定年结果显示,埃达克岩的形成时间为294.1±2.2 Ma,时代为早二叠世。地球化学特征显示,该埃达克岩属于低钾拉斑系列和中钾钙碱性岩石,具有高硅(SiO2=64.12%~69.12%)、高铝(Al2O3=16.05%~18.59%)、富钠贫钾(Na2O=5.08%~6.80%,K2O=0.70%~1.22%,Na2O/K2O=4.50~7.26)、高Sr(291.22×10-6~762.20×10-6),低Yb(0.74×10-6~1.28×10-6)、低Y(7.33×10-6~12.74×10-6)等特征。相对富集大离子亲石元素(如K、Rb和Sr),亏损高场强元素(如Nb、Ta、Zr、Ti和P),稀土元素总量较低(40.97×10-6~108.69×10-6),贫重稀土元素,无明显的负Eu异常,为典型的埃达克岩。梅劳特乌拉埃达克岩形成于俯冲带岛弧环境,可能为俯冲洋壳部分熔融而形成的埃达克质熔体,经俯冲带上升过程中与地幔楔橄榄岩发生相互作用而形成。埃达克岩和梅劳特乌拉蛇绿岩(308 Ma)的蛇纹石化方辉橄榄岩、层状-块状辉长岩、枕状拉斑玄武岩、玻安岩、富Nb玄武岩和高镁安山岩等构成洋内初始俯冲作用形成的较丰富且完整的岩石组合序列。研究结果表明,晚石炭世—早二叠世古亚洲洋东段开启了洋内初始俯冲作用。

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  • 图 1  研究区大地构造位置示意图(a、b)和梅劳特乌拉蛇绿岩地质简图(c, 据参考文献[9]修改)

    Figure 1. 

    图 2  梅劳特乌拉安山岩野外露头(a)及显微照片(b)

    Figure 2. 

    图 3  梅劳特乌拉安山岩锆石阴极发光代表图像(a)、锆石U-Pb年龄谐和图(b)及直方图(c)

    Figure 3. 

    图 4  梅劳特乌拉埃达克岩Nb/Y-Zr/TiO2岩石分类图[48](a)和SiO2-K2O分类图解[49](b)

    Figure 4. 

    图 5  梅劳特乌拉埃达克岩稀土元素球粒陨石标准化配分曲线图(a)和微量元素原始地幔标准化蛛网图(b)(球粒陨石标准化数值和原始地幔标准化数值分别据参考文献[52][53])

    Figure 5. 

    图 6  梅劳特乌拉埃达克岩Y-Sr/Y [56](a)和YbN-(La/Yb)N构造判别图解[51](b)

    Figure 6. 

    图 7  梅劳特乌拉埃达克岩(La/Yb)N-(Dy/Yb)N协变图解

    Figure 7. 

    图 8  梅劳特乌拉埃达克岩SiO2-Dy/Yb图解[68](a)、SiO2-Sr/Y图解[67](b,包括橄榄石+单斜辉石+斜长石+角闪石+钛磁铁矿)和La-La/Yb图解[74](c)

    Figure 8. 

    图 9  梅劳特乌拉埃达克岩Th/Sm-Th/Yb图解[81]

    Figure 9. 

    图 10  梅劳特乌拉埃达克岩(Yb+Ta)-Rb[84](a)、Nb/Yb-Th/Yb[85](b)、Hf/3-Th-Nb/16[86](c)和Th-La/Yb(d)构造判别图解[87](梅劳特乌拉玄武岩数据据参考文献[16],岩性符号同图 8)

    Figure 10. 

    表 1  梅劳特乌拉埃达克岩LA-ICP-MS锆石U-Th-Pb同位素分析结果

    Table 1.  LA-ICP-MS zircon U-Th-Pb isotopic analyses of Meilaotewula adakite

    点号 元素含量/10-6 Th/U 同位素比值 年龄/Ma
    Pb U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 208Pb/232Th 1σ 206Pb/238U 1σ 207Pb/235U 1σ
    1 11 224 0.3842 0.0480 0.0003 0.3784 0.0181 0.0572 0.0027 0.0159 0.0005 302 2 326 16
    2 16 332 0.3380 0.0469 0.0003 0.3747 0.0088 0.0580 0.0013 0.0147 0.0004 295 2 323 8
    3 12 251 0.2677 0.0467 0.0003 0.3541 0.0150 0.0549 0.0023 0.0141 0.0005 294 2 308 13
    4 19 398 0.3672 0.0469 0.0003 0.3411 0.0077 0.0528 0.0012 0.0127 0.0004 295 2 298 7
    5 17 380 0.4201 0.0450 0.0003 0.3301 0.0094 0.0531 0.0015 0.0120 0.0004 284 2 290 8
    6 18 381 0.3538 0.0472 0.0003 0.3551 0.0087 0.0546 0.0013 0.0117 0.0004 297 2 309 8
    7 11 230 0.2803 0.0470 0.0003 0.3540 0.0143 0.0546 0.0022 0.0119 0.0005 296 2 308 12
    8 11 244 0.2960 0.0459 0.0003 0.3008 0.0144 0.0475 0.0022 0.0122 0.0004 290 2 267 13
    9 21 459 0.3726 0.0464 0.0003 0.3510 0.0075 0.0549 0.0011 0.0105 0.0002 292 2 305 7
    10 17 361 0.4206 0.0474 0.0003 0.3340 0.0085 0.0511 0.0013 0.0105 0.0002 298 2 293 7
    11 18 395 0.3231 0.0464 0.0003 0.3334 0.0071 0.0521 0.0011 0.0100 0.0003 292 2 292 6
    12 17 369 0.3188 0.0460 0.0003 0.3621 0.0109 0.0570 0.0017 0.0107 0.0003 290 2 314 9
    13 21 506 0.0628 0.0456 0.0003 0.3290 0.0068 0.0523 0.0011 0.0099 0.0002 288 2 289 6
    14 20 455 0.2815 0.0465 0.0003 0.3667 0.0079 0.0572 0.0012 0.0097 0.0002 293 2 317 7
    15 16 357 0.3805 0.0473 0.0003 0.3413 0.0089 0.0523 0.0013 0.0089 0.0002 298 2 298 8
    16 15 319 0.3675 0.0468 0.0003 0.3698 0.0105 0.0573 0.0016 0.0106 0.0002 295 2 319 9
    17 17 363 0.3823 0.0473 0.0003 0.3369 0.0102 0.0516 0.0015 0.0106 0.0003 298 2 295 9
    下载: 导出CSV

    表 2  梅劳特乌拉埃达克岩主量、微量和稀土元素分析结果

    Table 2.  Major, trace elements and REE analytical results of Meilaotewula adakite

    岩石名称 安山岩 安山岩 英安岩 英安岩 英安岩
    样品号 XT3104 XT3106 XT3106-1 XT3107 XT3107-1
    SiO2 64.12 64.90 68.99 69.09 69.12
    TiO2 1.08 0.45 0.34 0.34 0.34
    Al2O2 18.59 17.24 16.05 16.10 16.06
    Fe2O2 2.81 0.84 1.40 1.48 1.41
    FeO 1.22 2.17 0.97 0.90 0.97
    MnO 0.046 0.05 0.04 0.04 0.04
    MgO 0.54 2.40 1.30 1.28 1.30
    CaO 1.65 2.66 3.49 3.39 3.40
    Na2O 6.80 5.49 5.10 5.14 5.08
    K2O 1.15 1.22 0.80 0.72 0.70
    P2O2 0.235 0.10 0.12 0.12 0.12
    烧失量 1.61 2.12 1.18 1.19 1.24
    总计 99.86 99.90 99.89 99.88 99.88
    Na2O/K2O 5.91 4.50 6.41 7.17 7.24
    Mg# 21.16 60.16 52.10 51.64 51.94
    La 17.39 6.95 8.53 8.35 8.27
    Ce 41.53 15.7 19.6 18.4 18.0
    Pr 5.93 1.93 2.57 2.48 2.42
    Nd 25.27 8.36 10.8 10.4 10.2
    Sm 5.30 1.80 2.30 2.15 2.10
    Eu 1.43 0.53 0.62 0.61 0.59
    Gd 4.04 1.59 1.92 1.80 1.76
    Tb 0.62 0.27 0.31 0.28 0.28
    Dy 3.37 1.60 1.69 1.55 1.53
    Ho 0.58 0.30 0.30 0.28 0.28
    Er 1.45 0.86 0.86 0.79 0.77
    Tm 0.22 0.13 0.13 0.12 0.12
    Yb 1.28 0.82 0.82 0.76 0.74
    Lu 0.28 0.14 0.13 0.12 0.12
    Y 12.74 7.66 8.11 7.34 7.33
    Sc 8.64 8.02 5.17 4.61 4.81
    Ni 6.0 19.0 9.74 8.68 8.72
    Rb 19.8 31.5 14.0 10.5 10.0
    Cr 5.0 16.6 13.4 11.9 12.7
    Co 13.0 10.2 5.86 5.84 5.77
    V 67.1 47.4 32.6 31.9 32.9
    Zr 199.20 101.71 117.94 120.60 118.63
    Hf 5.17 2.93 3.45 3.44 3.33
    Ta 0.18 0.15 0.23 0.21 0.17
    Sr 762.20 291.22 431.33 456.47 427.22
    Ba 344.7 71.2 107 110 101
    Nb 1.77 1.30 1.98 1.66 1.61
    Cs 1.84 0.96 0.99 0.72 0.75
    Ga 17.39 14.4 16.2 16.4 16.1
    Pb 7.7 2.15 5.86 5.52 5.04
    Th 2.32 2.02 2.04 1.84 1.84
    U 0.82 0.44 0.77 0.69 0.68
    ∑REE 108.69 40.97 50.60 48.07 47.16
    LREE/HREE 8.18 6.19 7.23 7.43 7.41
    (La/Yb)N 9.73 6.07 7.48 7.84 7.98
    δEu 0.91 0.93 0.88 0.92 0.91
    注:主量元素含量单位为%,微量和稀土元素含量单位为10-6
    下载: 导出CSV
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收稿日期:  2019-05-29
修回日期:  2020-04-16
刊出日期:  2020-09-15

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