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    高压-超高压变质岩石中不同成因的石榴石

    夏琼霞

    夏琼霞, 2019. 高压-超高压变质岩石中不同成因的石榴石. 地球科学, 44(12): 4042-4049. doi: 10.3799/dqkx.2019.235
    引用本文: 夏琼霞, 2019. 高压-超高压变质岩石中不同成因的石榴石. 地球科学, 44(12): 4042-4049. doi: 10.3799/dqkx.2019.235
    Xia Qiongxia, 2019. Different Origins of Garnet in High to Ultrahigh Pressure Metamorphic Rocks. Earth Science, 44(12): 4042-4049. doi: 10.3799/dqkx.2019.235
    Citation: Xia Qiongxia, 2019. Different Origins of Garnet in High to Ultrahigh Pressure Metamorphic Rocks. Earth Science, 44(12): 4042-4049. doi: 10.3799/dqkx.2019.235

    高压-超高压变质岩石中不同成因的石榴石

    doi: 10.3799/dqkx.2019.235
    基金项目: 

    国家“973”计划项目 2015CB856104

    国家自然科学基金项目 41822201

    国家自然科学基金项目 41772048

    详细信息
      作者简介:

      夏琼霞(1979-), 女, 博士, 特任教授, 主要从事造山带变质岩石学和地球化学

    • 中图分类号: P581

    Different Origins of Garnet in High to Ultrahigh Pressure Metamorphic Rocks

    • 摘要: 石榴石是高压-超高压变质岩石中最重要的变质矿物之一,是研究俯冲带深部变质和熔融过程的理想研究对象.通过对俯冲带内不同条件下形成的石榴石进行详细研究,确定了岩浆成因、变质成因和转熔成因石榴石.岩浆石榴石是岩浆熔体在冷却过程中结晶形成,成分主要为锰铝榴石-铁铝榴石,通常含有石英、长石、磷灰石等晶体包裹体.变质石榴石是在亚固相条件下通过变质反应形成,包裹体为参与变质反应的矿物组合;进变质生长的石榴石通常显示核部到边部锰铝榴石降低的特征.转熔石榴石是在超固相条件下通过转熔反应形成,通常含有晶体包裹体,其中既有从转熔熔体结晶的矿物包裹体,也有转熔反应残留的矿物包裹体.对超高压变质岩石中转熔石榴石的识别,可以为深俯冲陆壳岩石的部分熔融提供重要的岩石学证据,是大陆俯冲带部分熔融研究的重要进展之一.

       

    • 图  1  大别山双河地区超高压变质片麻岩中变质成因和转熔成因石榴石

      修改自Xia et al.(2016)

      Fig.  1.  Metamorphic and peritectic garnets in anatectic UHP metamorphic gneiss at Shuanghe in the Dabie orogen

      图  2  喜马拉雅东构造结高压混合岩和脉状花岗岩岩中转熔石榴石和岩浆石榴石

      修改自Xia et al.(2019)

      Fig.  2.  Peritectic and magmatic garnets in HP migmatites and vein granites from eastern Himalayan syntaxis

      图  3  超高压变质花岗岩中岩浆石榴石残斑核和变质生长石榴石幔部和边部

      a.背散射图像; b.Mn元素分布图示; c.主量元素剖面; d.稀土元素剖面; 修改自Xia et al.(2012)

      Fig.  3.  The residual of magmatic garnet in the core and new growth of metamorphic garnet in the mantle and rims from the UHP metamorphosed granites

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    出版历程
    • 收稿日期:  2019-08-29
    • 刊出日期:  2019-12-15

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