石英中の常磁性格子欠陥の熱安定性の研究によるESR年代測定の基礎の確立  [in Japanese] Studies on thermal stabilities of paramagnetic lattice defects in quartz: Basis for the ESR dating method  [in Japanese]

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Author(s)

    • 豊田 新 TOYODA Shin
    • 大阪大学大学院理学研究科宇宙地球科学専攻:(現)岡山理科大学理学部応用物理学科 Department of Earth and Space Science, Graduate School of Science, Osaka University: (Present address) Department of Applied Physics, Faculty of Science, Okayama University of Science

Abstract

The ESR (electron spin resonance) dating method has been applied to faults, tephras, sediments and flints, using quartz. This paper summarizes the studies on thermal stabilities of paramagnetic defects observed in natural quartz, E<sub>1</sub>', Al and Ti centers. The age ranges to which ESR dating can be applied were estimated from the results of heating experiments. The decay kinetics of these three centers was found to be second order. A method to estimate the amount of oxygen vacancies in quartz was proposed, which involves measuring the intensity of the E<sub>1</sub>' center after irradiation to more than 200 Gy and subsequent heating at 300℃ for 15 minutes. Using this technique, oxygen vacancies were found to be much more stable than other paramagnetic centers. A correlation was observed between the geologic ages of the granites and of tephras and the amount of oxygen vacancies in quartz. The external β and γ rays can create the oxygen vacancies as indicated by the experiment of irradiation by <sup>60</sup>Co source.

Journal

  • Chikyukagaku

    Chikyukagaku 32(3), 127-137, 1998

    The Geochemical Society of Japan

References:  43

Cited by:  1

Codes

  • NII Article ID (NAID)
    110008679953
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    4549095
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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