超高圧変成帯中のザクロ石橄欖岩およびエクロジャイトの温度圧力履歴解析法:地質温度圧力計の概説と適用

  • 苗村 康輔
    東京大学大学院理学系研究科地球惑星科学専攻
  • 中村 大輔
    岡山大学理学部地球科学科
  • 平島 崇男
    京都大学大学院理学研究科地球惑星科学専攻地質学鉱物学教室

書誌事項

タイトル別名
  • Methods to estimate the pressure-temperature histories of garnet peridotite and eclogite in the ultrahigh-pressure metamorphic belts: A review of geothermobarometers and their geological applications
  • チョウコウアツ ヘンセイタイ チュウ ノ ザクロイシカンランガン オヨビ エクロジャイト ノ オンド アツリョク リレキ カイセキホウ : チシツ オンド アツリョクケイ ノ ガイセツ ト テキヨウ

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抄録

  Ultrahigh-pressure (UHP) metamorphic rocks, represented by coesite- or its pseudomorph-bearing eclogites, have been found mainly from continent-continent collision orogenic belts, and garnet peridotite bodies are also known to occur in such UHP belts. The UHP eclogites and garnet peridotite bodies/layers/lenses are commonly enclosed within metamorphic rocks derived from continent crustal materials composed by moderate to low pressure metamorphic minerals, although they should have been located under deep mantle depths (>50 km). Therefore, elucidation of juxtaposition processes between the mantle material and the host crustal material is one of main subjects for the petrology in the UHP belts. Delineating of pressure-temperature (P-T) paths of these UHP garnet peridotite bodies can give us indispensable constraints to clarify the juxtaposition process of mantle and crustal materials in the continent-collision settings and the exhumation processes of deeply subducted rocks with higher density than the crustal rocks. In this paper, we summarize the commonly used methods to determine P-T histories of the UHP garnet peridotite bodies (i.e., geo-thermometer and barometer) and discuss P-T paths of UHP rocks in collision type orogenic belts, and their tectonic significance.<br>

収録刊行物

  • 岩石鉱物科学

    岩石鉱物科学 41 (6), 225-246, 2012

    一般社団法人 日本鉱物科学会

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