変成作用における圧力-温度-時間経路 Pressure-Temperature-Time Paths of Metamorphism

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著者

    • 榎波 正樹 ENAMI Masaki
    • 名古屋大学大学院理学研究科地球惑星理学 Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University
    • 鈴木 和博 SUZUKI Kazuhiro
    • 名古屋大学大学院理学研究科地球惑星理学 Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University
    • 加藤 丈典 KATO Takenori
    • 名古屋大学大学院理学研究科地球惑星理学 Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University

抄録

Chronological information is indispensable for the detailed analyses of a temperature-pressure-time path of metamorphic rocks and for modeling of whole metamorphic processes from subduction to exhumation. The succession of prograde and retrograde metamorphic reactions should have been recorded by chemical zoning and reaction texture of metamorphic minerals including epidote group minerals and titanite. These minerals, containing substantial amounts of ThO<SUB>2</SUB> (up to 2.5 wt%) and UO<SUB>2</SUB> (up to 0.6 wt%), are useful for providing reliable chronological information on individual metamorphic reactions. CHIME (chemical Th-U-total Pb isochron method) is a nondestructive age determination method having high spatial resolution. Although the CHIME coupled with EPMA (electron probe micro-analyzer) is a powerful tool for subgrain dating of Th-and/or U-rich minerals, the EPMA is hard to analyze Pb in young epidote group minerals as well as titanite. The detection sensitivity of the micro-PIXE (Proton Induced X-ray Emission) analysis, a proton analogue of EPMA, is an order of magnitude higher than that of EPMA. Thus, the CHIME coupled with micro-PIXE will make it possible to obtain subgrain age data of epidote group minerals and titanite as young as 10Ma. Our analytical capabilities for the age determination are much greater than seemed possible ten years ago, they become certainly possible powerful tools for Earth Sciences as EPMA has been for the last twenty-five years.

収録刊行物

  • 地學雜誌  

    地學雜誌 106(5), 689-698, 1997-10-25 

    Tokyo Geographical Society

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各種コード

  • NII論文ID(NAID)
    10002236613
  • 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
    4322563
  • 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  NDL  J-STAGE 
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