高圧変成岩からみた大陸地殻の進化 Transition from High-/ultrahigh-pressure Metamorphic Rocks to the Continental Crust

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著者

    • 平島 崇男 HIRAJIMA Takao
    • 京都大学大学院理学研究科地質学鉱物学教室 Department of Geology and Mineralogy, Graduate School of Earth Science, Kyoto University

抄録

Processes of the granulite facies overprinting on high-pressure (HP) and ultrahigh-pressure (UHP) rocks were considered by comparing the model and actual P-T paths. The model P-T paths based on the thermal structures below the continent-continent collision zone predict that the granulite facies overprinting on the HP and UHP rocks can occur in following three cases. 1) Exhumation at a moderate rate resulting in moderate heating during decompression, which forms a clockwise P-T path. 2) Infinitely fast exhumation of relatively high-T (>700°C) HP/UHP rocks. 3) Isobaric heating at lower-crust depths. Several HP rocks in the western gneiss region and the Bohemian massif recorded paths 1) and 2) and UHP rocks in these areas recorded the path 2). There is only one report of the path 3) in the Bohemian massif. P-T paths of the granulitized coesite-eclogite in eastern China is still under discussion. In the regional gneiss region, granulite facies overprinting on the HP/UHP rocks, i.e., a transition from HP/UHP rocks to the continental crustal material, seems to be not a rare phenomenon.

収録刊行物

  • 地學雜誌  

    地學雜誌 106(5), 670-681, 1997-10-25 

    Tokyo Geographical Society

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各種コード

  • NII論文ID(NAID)
    10002236544
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    4322561
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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