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    传统温压计在低温榴辉岩应用中的局限:以西南天山超高压变质带为例

    张丽娟 张立飞 初旭

    张丽娟, 张立飞, 初旭, 2018. 传统温压计在低温榴辉岩应用中的局限:以西南天山超高压变质带为例. 地球科学, 43(1): 164-175. doi: 10.3799/dqkx.2018.010
    引用本文: 张丽娟, 张立飞, 初旭, 2018. 传统温压计在低温榴辉岩应用中的局限:以西南天山超高压变质带为例. 地球科学, 43(1): 164-175. doi: 10.3799/dqkx.2018.010
    Zhang Lijuan, Zhang Lifei, Chu Xu, 2018. Limitations of Traditional Thermobarometer in Applications to Low-Temperature Eclogites: A Case Study of UHP Metamorphic Belt in Southwest Tianshan. Earth Science, 43(1): 164-175. doi: 10.3799/dqkx.2018.010
    Citation: Zhang Lijuan, Zhang Lifei, Chu Xu, 2018. Limitations of Traditional Thermobarometer in Applications to Low-Temperature Eclogites: A Case Study of UHP Metamorphic Belt in Southwest Tianshan. Earth Science, 43(1): 164-175. doi: 10.3799/dqkx.2018.010

    传统温压计在低温榴辉岩应用中的局限:以西南天山超高压变质带为例

    doi: 10.3799/dqkx.2018.010
    基金项目: 

    国家自然科学基金项目 41330210

    国家自然科学基金项目 41520104004

    中国博士后基金项目 8201400768

    详细信息
      作者简介:

      张丽娟(1986-), 女, 助理研究员, 主要从事高压-超高压变质岩岩石学及地球化学方面的研究

      通讯作者:

      张立飞

    • 中图分类号: P581

    Limitations of Traditional Thermobarometer in Applications to Low-Temperature Eclogites: A Case Study of UHP Metamorphic Belt in Southwest Tianshan

    • 摘要: 榴辉岩相变质岩石的温压研究对理解高压-超高压变质带的形成和演化具有重要意义,但西南天山低温榴辉岩运用石榴石-绿辉石(-多硅白云母)温压计计算的压力普遍低于相平衡模拟的结果.为此,在Zhang et al.(2017)对含霓辉石榴辉岩研究结果的基础上,对该区域内榴辉岩及其脉体中的绿辉石进行了岩相学和矿物化学的研究,结果表明绿辉石普遍发育环带结构:从核部到边部,Fe3+含量降低,Al含量增加,Fe3+/Al比值的降低对应于霓石含量的降低和硬玉含量的升高.相平衡模拟中硬玉分子等值线的计算结果表明具有最高硬玉含量的边部绿辉石在降压阶段生长.因此,具有最高含量的硬玉组分的绿辉石并不一定代表峰期压力,在应用石榴石-单斜辉石(-多硅白云母)传统温压计时需谨慎,尤其是应用于低温的、具有复杂环带模式的矿物组合时要尤为慎重.

       

    • 图  1  西南天山超高压变质带榴辉岩变质P-T轨迹(实曲线)和P-T条件(方形阴影)总结

      图据Zhang et al.(2017)修改

      Fig.  1.  Summary of P-T paths (solid curves) and P-T conditions (shaded squares) derived from eclogites from the Southwest Tianshan UHP belt

      图  2  榴辉岩和高压脉体中的绿辉石环带背散射照片

      a.榴辉岩中绿辉石核部呈半自形到他形浅灰色,边部呈他形深灰色(HB121-8);b.高压脉体中绿辉石颗粒粗大,核部呈自形浅灰色,边部则呈自形-半自形深灰色(HB121-8v);c.部分绿辉石颗粒保留了成分环带,其他颗粒则已难以区分(HB121-10);d.石英脉中粗粒绿辉石,边部发育角闪石,环带已不明显(HB121-10v);e.榴辉岩中绿辉石的核部呈半自形灰色,边部呈他形黑色(HB121-13);f.石英脉中粗粒绿辉石,核部较高的硬玉含量是由于绿辉石中发育裂隙并包裹石英所致(HB121-13v);g.退变质作用非常强烈,已很难区分出核-边结构,但仍可分出深色和浅色区域,浅色的绿辉石硬玉含量低,深色的绿辉石硬玉含量高,且越靠近脉体处的绿辉石颜色越深(HB121-21);h.石英脉中粗粒绿辉石垂直脉体边缘生长,边部发育角闪石,环带已不明显(HB121-21v);i.少数绿辉石颗粒仍保留成分环带,大多颗粒则已难以区分(HB123-5);j.绿辉石较为粗大,且发生碎裂,边部退变为角闪石,仍可辨别出核-边结构(HB123-5v).白色数字代表绿辉石硬玉(Jd)组分,且从核部到边部硬玉含量总体升高.矿物简写据Whitney and Evans(2010):Grt.石榴石;Omp.绿辉石;Rt.金红石;Ttn.榍石;Ph.多硅白云母;Pg.钠云母;Amp.角闪石;Czo.斜黝帘石;Dol.白云石;Cal.方解石;Qz.石英;Zrn.锆石

      Fig.  2.  BSE photographs of omphacite zonations in eclogites and HP veins

      图  3  绿辉石成分分类图解

      自核部向边部绿辉石霓石组分逐渐降低,硬玉组分逐渐升高,底图据Morimoto (1988)

      Fig.  3.  Compositional ternary classification diagram of omphacite

      图  4  含柯石英假象榴辉岩样品HB121-10 P-T视剖面图叠加绿辉石j(o)等值线

      图修改自Zhang et al.(2016);a.以全岩成分计算的P-T视剖面图;b.以有效全岩成分计算的P-T视剖面图;图中j(o)=硬玉+霓石,以橙色粗实线表示,数值为j47-j58.图中黑色方框里所标数值为样品HB121-10中基质绿辉石实测值;紫色方框所标数值为脉体绿辉石的实测值.矿物简写:Gln.蓝闪石;Lws.硬柱石;Tlc.滑石;Coe.柯石英;Ep.绿帘石;Ky.蓝晶石;Chl.绿泥石;Pl.斜长石;Bt.黑云母;其他矿物简写同上

      Fig.  4.  P-T pseudosection calculated for coesite pseudomorph bearing eclogite HB121-10 contoured with j(o) isopleths

      表  1  榴辉岩和高压脉体中绿辉石代表性主量元素成分

      Table  1.   Representative major element compositions of omphcites in eclogites and HP veins

      Mineral HB121-8 HB121-8v HB121-10 HB121-10v
      o-c浅 o-r深 o-in-pg o-in-ep o-in-g-r o-c浅 o-r深 o-浅 o-深 o-in-g-m o-c o-r
      SiO2 55.31 55.20 55.59 54.41 56.27 56.72 58.41 56.07 55.66 55.55 56.40 56.18
      TiO2 0.07 0.03 0.05 0 0.03 0.05 0.07 0.04 0.05 0 0 0.05
      Al2O3 9.80 11.44 11.82 11.49 11.08 11.16 12.55 11.36 12.31 9.48 10.53 10.91
      Cr2O3 0.05 0.12 0 0.09 0.01 0.01 0.09 0 0.03 0.11 0 0.02
      FeO 7.21 4.12 3.29 5.05 7.13 6.88 3.57 3.90 2.97 8.75 6.63 5.81
      MnO 0 0.01 0 0.04 0.02 0.04 0 0.03 0 0.02 0.03 0.01
      MgO 6.82 7.66 8.00 8.71 6.25 6.38 7.29 7.56 7.82 6.69 7.04 6.64
      CaO 12.08 12.95 12.98 11.87 10.78 11.15 11.58 12.88 12.65 12.55 11.94 11.49
      Na2O 7.46 7.18 7.03 6.39 8.28 8.01 7.69 7.82 7.52 7.79 7.85 7.85
      K2O 0.01 0 0 0.04 0.02 0.01 0 0.01 0.03 0.03 0 0.01
      Totals 98.80 98.71 98.76 98.10 99.86 100.41 101.25 99.68 99.04 100.97 100.43 98.96
      Si 2.001 1.981 1.989 1.971 2.004 2.013 2.027 1.984 1.978 1.971 1.998 2.017
      Ti 0.002 0.001 0.001 0 0.001 0.001 0.002 0.001 0.001 0 0 0.001
      Al 0.418 0.484 0.499 0.491 0.465 0.467 0.513 0.474 0.516 0.397 0.440 0.462
      Cr 0.001 0.003 0 0.003 0.000 0 0.003 0 0.001 0.003 0 0.001
      *Fe3+ 0.100 0.049 0.008 0.016 0.097 0.056 0 0.093 0.044 0.195 0.103 0.047
      **Fe3+ 0.105 0.012 0 0 0.108 0.085 0.001 0.063 0.002 0.137 0.099 0.084
      Fe2+ 0.119 0.074 0.090 0.137 0.115 0.148 0.104 0.023 0.044 0.065 0.094 0.127
      Mn 0 0 0 0.001 0.001 0.001 0 0.001 0 0.001 0.001 0
      Mg 0.368 0.410 0.427 0.470 0.332 0.337 0.377 0.399 0.414 0.354 0.372 0.355
      Ca 0.468 0.498 0.498 0.460 0.411 0.424 0.431 0.488 0.482 0.477 0.453 0.442
      Na 0.524 0.499 0.488 0.449 0.572 0.551 0.517 0.537 0.518 0.536 0.539 0.547
      K 0 0 0 0.002 0.001 0.001 0 0 0.001 0.001 0 0
      Sum 4.000 4.000 4.000 4.000 4.000 4.000 4.000 4.000 4.000 4.000 4.000 4.000
      Jd 41.900 46.500 48.800 46.200 46.900 48.000 54.000 45.800 49.400 36.800 43.800 47.900
      Ae 10.000 4.900 0.800 1.600 9.700 5.600 0.000 9.300 4.400 19.500 10.300 4.700
      WEE 48.100 48.600 50.400 52.200 43.400 46.400 46.000 44.900 46.200 43.700 45.900 47.400
      Mineral HB121-13 HB121-13v HB121-21 HB121-21v HB123-5 HB123-5v
      o-c浅 o-r深 o-c浅 o-r深 o-c浅 o-r深 o-c浅 o-r深 o-c浅 o-r深 o-c浅 o-r深
      SiO2 56.22 56.78 55.30 57.18 55.75 57.54 56.35 56.18 56.18 56.49 56.72 57.65
      TiO2 0.12 0.03 0.09 0.06 0.03 0 0.03 0.02 0 0.05 0.05 0.01
      Al2O3 10.33 12.61 10.01 12.77 9.43 13.71 10.22 11.54 11.53 11.25 10.04 12.02
      Cr2O3 0.02 0 0 0.02 0 0.01 0 0 0.09 0.06 0 0.01
      Fe2O3 4.82 0 6.01 0 4.63 0.40 5.47 2.75 2.95 2.23 2.16 2.66
      FeO 9.77 1.99 9.94 2.72 9.25 4.62 9.86 7.56 2.80 3.11 6.62 5.70
      MnO 0.04 0 0.06 0.01 0 0 0.07 0.04 0.01 0.01 0.06 0.06
      MgO 5.30 7.19 5.01 6.51 6.16 5.97 5.15 5.37 9.00 8.33 7.29 6.56
      CaO 10.35 11.93 10.04 11.74 12.10 10.55 10.60 10.22 13.96 13.55 12.54 11.30
      Na2O 8.43 7.58 8.58 7.74 7.57 8.70 8.54 8.49 7.24 7.38 7.34 8.49
      K2O 0.02 0 0 0 0.01 0 0 0 0.01 0.02 0 0
      Totals 100.60 98.12 99.03 98.76 100.29 101.11 100.83 99.43 101.11 100.25 100.67 101.81
      Si 2.007 2.023 2.004 2.029 2.001 2.008 2.007 2.014 1.963 1.987 2.013 2.005
      Ti 0.003 0.001 0.002 0.002 0.001 0 0.001 0.001 0 0.001 0.001 0
      Al 0.435 0.530 0.428 0.534 0.399 0.564 0.429 0.488 0.475 0.467 0.420 0.493
      Cr 0.001 0 0 0.001 0 0 0 0 0.002 0.002 0 0
      *Fe3+ 0.129 0 0.163 0 0.125 0.009 0.145 0.073 0.077 0.059 0.057 0.068
      **Fe3+ 0.148 0 0.175 0 0.128 0.025 0.161 0.102 0.014 0.035 0.085 0.080
      Fe2+ 0.162 0.059 0.138 0.081 0.152 0.126 0.148 0.154 0.004 0.032 0.140 0.097
      Mn 0.001 0 0.002 0 0 0 0.002 0.001 0 0 0.002 0.002
      Mg 0.282 0.382 0.271 0.344 0.329 0.310 0.273 0.287 0.469 0.437 0.386 0.340
      Ca 0.396 0.455 0.390 0.446 0.465 0.394 0.404 0.393 0.523 0.511 0.477 0.421
      Na 0.583 0.524 0.603 0.532 0.527 0.589 0.590 0.590 0.491 0.503 0.505 0.573
      K 0.001 0 0 0 0 0 0 0 0 0.001 0 0
      Sum 4 4 4 4 4 4 4 4 4 4 4 4
      Jd 44.2 52.4 43.2 53.2 40 57.2 43.6 50.2 43.8 45.4 43.3 49.8
      Ae 12.9 0 16.3 0 12.5 0.9 14.5 7.3 7.7 5.9 5.7 6.8
      WEE 42.9 47.6 40.5 46.8 47.5 41.9 41.9 42.5 48.5 48.7 51.0 43.4
      注:o-c.绿辉石核部;o-r.绿辉石边部;o-in-pg.钠云母中的绿辉石包体;o-in-ep.绿帘石中的绿辉石包体;o-in-g-r.石榴石边部的绿辉石包体;o-in-g-m.石榴石幔部的绿辉石包体;深和浅代表背散射图像中的颜色;其中绿辉石化学式中Fe3+含量计算方法:*Fe3+由AX程序根据电价平衡计算(T.J.B.Holland, http://www.esc.cam.ac.uk/astaff/holland/as.html);**Fe3+通过Na+K-Cr-Al估算.
      下载: 导出CSV
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