%0 Journal Article
%T Chronology of Cauvery Delta Sediments from Shallow Subsurface Cores Using Elevated-Temperature Post-IR IRSL Dating of Feldspar
%A L. Alappat
%A S. Tsukamoto
%A P. Singh
%A D. Srikanth
%A R. Ramesh
%A M. Frechen
%J Geochronometria
%@ 1897-1695
%D 2010
%I 
%R 10.2478/v10003-010-0025-1
%X We present the results of luminescence dating of sediments from two cores from the Cauvery Delta in south-east India. Since all natural quartz OSL signals except one sample were in saturation, the elevated temperature post-IR IRSL protocol for K-feldspar was applied to establish a chronology. Internal dose rates of K-feldspar grains were calculated from the measured internal content of potassium, uranium, thorium and rubidium in the bulk of K-feldspar grains using solution ICP-OES and ICP-MS analysis. A substantial scatter in single-aliquot De values was observed which is most probably due to the effect of incomplete bleaching of fluvial sediments before burial. A minimum age model was applied to extract possible depositional ages. The study revealed that except an upper layer of Holocene sediments (< 5m), the majority of the upper ~50m of Cauvery delta sediments were deposited between marine isotope stage MIS-5 and MIS-10 or older. The feldspar luminescence ages also indicate the existence of a period of non deposition or erosion in the upper part of the cores.
%K Cauvery delta
%K fluvial sediments
%K OSL dating
%K elevated temperature IRSL
%K K-feldspar
%U http://versita.metapress.com/content/cr3607247r465225/?p=6cbdb3a8d2f0443287696d95ee87eb1f&pi=5