<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>One sample from a fluvial terrace of Loir river (France) deposited during isotopic stages 7-8 and two samples from isotopic stage 5 marine sediments of Echizen Coast (Japan) were dated by ESR of quartz grains. Both additive and regenerative techniques were used on Ti-Li and Ti-H centers of quartz. No change of sensitivity of the centers was observed during regeneration which significantly reduced the errors on the equivalent doses. Bleaching experiments indicated that the Ti-Li center is less sensitive to UV(ultra-violet)-A (365-412 nm) than to the full sun spectrum whereas UVA alone is sufficient to reset the bleachable component of the Al-center. This effect could be the origin of the strong overestimation of the ages determined using the Ti-Li center in this study. The comparison of the equivalent doses determined by the two Ti-centers indicated that bleaching before deposition of the fluvial sediment was apparently better than for the marine sample.</p></abstract>

One sample from a fluvial terrace of Loir river (France) deposited during isotopic stages 7-8 and two samples from isotopic stage 5 marine sediments of Echizen Coast (Japan) were dated by ESR of quartz grains. Both additive and regenerative techniques were used on Ti-Li and Ti-H centers of quartz. No change of sensitivity of the centers was observed during regeneration which significantly reduced the errors on the equivalent doses. Bleaching experiments indicated that the Ti-Li center is less sensitive to UV(ultra-violet)-A (365-412 nm) than to the full sun spectrum whereas UVA alone is sufficient to reset the bleachable component of the Al-center. This effect could be the origin of the strong overestimation of the ages determined using the Ti-Li center in this study. The comparison of the equivalent doses determined by the two Ti-centers indicated that bleaching before deposition of the fluvial sediment was apparently better than for the marine sample.

ESR Dating of Sedimentary Quartz from Two Pleistocene Deposits Using Al and Ti-Centers

Department of Applied Physics, Okayama University of Science, 1-1 Ridai, Okayama, 700-0005, Japan

Département de Préhistoire, Muséum National d'Histoire Naturelle, UMR 5198 du CNRS, 1 Rue René Panhard, 75013, Paris, France

Regional Environment studies, Nara Women's university, Kita-Uoya-Nishimachi, Nara 630-8506, Japan

Geochronometria

One sample from a fluvial terrace of Loir river (France) deposited during isotopic stages 7-8 and two samples from isotopic stage 5 marine sediments of Echizen...

ESR Dating of Sedimentary Quartz from Two Pleistocene Deposits Using Al and Ti-Centers

Publié en ligne: 16 avr. 2008

Pages: 23 - 31

DOI: https://doi.org/10.2478/v10003-008-0004-y

Mots clés
ESR dating, Ti-H center, Ti-Li center, bleaching, regeneration

This content is open access.

ESR Dating of Sedimentary Quartz from Two Pleistocene Deposits Using Al and Ti-Centers

Publié en ligne: 16 avr. 2008

Pages: 23 - 31

DOI: https://doi.org/10.2478/v10003-008-0004-y

Mots clésESR dating, Ti-H center, Ti-Li center, bleaching, regeneration

This content is open access.

Mots clés
ESR dating, Ti-H center, Ti-Li center, bleaching, regeneration