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首页> 外文期刊>Contributions to Mineralogy and Petrology >Ultrahigh-temperature metamorphism followed by two-stage decompression of garnet–orthopyroxene–sillimanite granulites from Ganguvarpatti, Madurai block, southern India
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Ultrahigh-temperature metamorphism followed by two-stage decompression of garnet–orthopyroxene–sillimanite granulites from Ganguvarpatti, Madurai block, southern India

机译：来自印度南部马杜赖区块Ganguvarpatti的石榴石-邻苯二茂基-硅线石粒岩的超高温变质作用，然后进行两阶段减压

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摘要

The Mg–Al granulites from Ganguvarpatti consist of orthopyroxene–sillimanite–garnet ± quartz as peak assemblage, with a few porphyroblasts of cordierite and sapphirine. These assemblages were strongly overprinted by late symplectites and coronas. Orthopyroxene inclusions in garnet and porphyroblast cores have the highest X Mg (0.80) and Al2O3 content (10.7 wt%). The estimated near-peak metamorphic conditions (1,000±50°C and 11 kbar) using garnet–orthopyroxene geothermobarometry are consistent with those determined using a petrogenetic grid. The proposed multi-stage evolution process implies an initial decompression, deduced from multi-phase symplectites, followed by cooling during biotite formation. Further late decompression is explained from the orthopyroxene rims on biotite. This proposed P–T path thus suggests a unique and complex evolution history for the UHT granulites of southern India. Present results are comparable with similar adjacent terranes in the Gondwana supercontinent, but the lack of structural and geochronological data makes a link with any major metamorphic event uncertain.
机译：来自Ganguvarpatti的Mg-Al粒状颗粒由邻苯二茂铁-硅线石-石榴石±石英组成，峰组合，有一些堇青石和蓝宝石成卟啉。这些组合被后期的折纹和日冕强烈覆盖。石榴石和成卟啉核中的邻二甲苯夹杂物的X Mg （0.80）和Al2 O3 含量最高（10.7 wt％）。使用石榴石-邻二甲苯地热气压法估算的近峰变质条件（1,000±50°C和11 kbar）与使用成岩网格确定的相符。拟议的多阶段演化过程意味着从多相共生体推断出初始减压，然后在黑云母形成过程中进行冷却。从黑云母上的邻苯二甲边缘解释了进一步的后期减压。因此，该拟议的PT路径为印度南部的UHT粒岩提出了独特而复杂的演化历史。目前的结果可与冈瓦纳超大陆上类似的邻近地层相媲美，但是缺乏结构和年代学数据使得与任何主要变质事件的联系都不确定。

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  • 来源
    《Contributions to Mineralogy and Petrology》 |2004年第1期|29-46|共18页
  • 作者

    K. Sajeev; Y. Osanai; M. Santosh;

  • 作者单位

    Division of Earth and Planetary System Science Okayama UniversityBasic Science Research Institute Chonbuk National University;

    Division of Earth and Planetary System Science Okayama UniversityDivision of Evolution of Earth Environments Graduate School of Social and Cultural Studies Kyushu University;

    Department of Natural and Environmental Science Kochi University;

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