Electron Spin Resonance Isochrone Dating of Fracture Age:Grain-Size Dependence of Dose Rates for Fault Gouge
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概要
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A new isochrone method of electron spin resonance (ESR) dating has been proposed utilizing the different average dose rates of external radiation for different grain sizes due to the range of external α- and β-rays. The equivalent doses (EDs) obtained by the additive dose method were plotted as a function of the external dose rate (D_<ex>) corrected for the grain sizes. The slope gives an ESR isochrone age since the fracture (T_<fra>) or the surface formation; the coordinate abscissa gives the internal dose (D_<in>T_<for>) where D_<in> is the internal dose rate and T_<for> is the age of the mineral formation. The method has been applied to quartz (SiO_2) grains in geological fault gouge at outcrops of the Rokko Fault giving T_<fra>=102,000 years and T_<for> of nearly zero for grains less than 100μm.
- 1995-03-01
著者
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Ikeya Motoji
Department Of Earth And Space Science Faculty Of Science Osaka University
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Yamanaka Chihiro
Department Of Earth And Space Science Faculty Of Science Osaka University
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Tani Atsushi
Department Of Earth And Space Science Faculty Of Science Osaka University
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Tani Atsushi
Department Of Chemistry Graduate School Of Science Hiroshima University
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