期刊
GEOCHRONOMETRIA
卷 37, 期 -, 页码 37-47出版社
SCIENDO
DOI: 10.2478/v10003-010-0025-1
关键词
Cauvery delta; fluvial sediments; OSL dating; elevated temperature IRSL; K-feldspar
资金
- German Academic Exchange Service (DAAD)
- Leibniz Institute for Applied Geophysics (LIAG), Hannover
- Department of Science and Technology (DST), Government of India
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 D-e 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 similar to 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.
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