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End date: 2024 × Start date: 2020 × End date: 2019 × Start date: 2010 × DDC: 620 × search.filters.applied.f.series: Geochronometria : journal on methods and applications of absolute chronology 37 (2010) ×

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    Chronology of Cauvery Delta Sediments from Shallow Subsurface Cores Using Elevated-Temperature Post-IR IRSL Dating of Feldspar
    (Warsaw : De Gruyter, 2010) Alappat, L.; Tsukamoto, S.; Singh, P.; Srikanth, D.; Ramesh, R.; Frechen, M.
    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. © 2010 GADAM Centre Institute of Physics, Silesian University of Technology. All rights reserved.
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    The Characteristics of OSL Signal from Quartz Grains Extracted from Modern Sediments in Japan
    (Warsaw : De Gruyter, 2010) Tokuyasu, Kayoko; Tanaka, Kazuhiro; Tsukamoto, Sumiko; Murray, Andrew
    Quartz grains from sediments in Japan are derived from complex mixtures of sources, including volcanic, plutonic, metamorphic and sedimentary rocks. We have measured the OSL signal of quartz grains from modern coastal sediments derived from different source rocks and compared these characteristics with the likely source. Each sample shows a different combination of various OSL components. It is concluded that the source rock affects the characteristics of the OSL components from quartz grains in Japanese sediments. By comparing the LM-OSL signals from volcanic sources with those from various source rocks, it can be deduced that quartz which has a higher fast component ratio is more suitable for dating. We also conclude that volcanic source areas should be avoided. © 2010 GADAM Centre Institute of Physics, Silesian University of Technology. All rights reserved.