%0 Journal Article
%T ESR Dating of Sedimentary Quartz from Two Pleistocene Deposits Using Al and Ti-Centers
%A H¨¦l¨¨ne Tissoux
%A 
%A Shin Toyoda
%A Christophe Falgu¨¨res
%A Pierre Voinchet
%A Masashi Takada
%A Jean-Jacques Bahain
%A Jackie Despri¨¦e
%J Geochronometria
%@ 1897-1695
%D 2008
%I 
%R 10.2478/v10003-008-0004-y
%X 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.
%K ESR dating
%K Ti-H center
%K Ti-Li center
%K bleaching
%K regeneration
%U http://versita.metapress.com/content/w5841t155t474175/?p=2be6626587aa42b999a91bc2bb835132&pi=3