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A new measurement protocol has been tested on K-feldspars from Whanganui Inlet and Parengarenga Harbour, New Zealand. A Single Aliquot Regenerative (SAR) dose protocol, using two successive infrared (IR) stimulations (post-IR IR SAR protocol) is setup for these young (<1000 years) coastal sediments. Significant anomalous fading (g2days=7 %/decade) is observed using the conventional IR signal measured at 50°C. In contrast, the fading rate of the IR signal measured at elevated temperature (150°C) after the IR stimulation at 50°C (a post-IR IR signal) is not significant (g2days=7% /decade). Surprisingly low residual infrared stimulated luminescence (IRSL) signals were observed for a surface sample, suggesting that accurate ages as young as ~50 years can be obtained for these recent deposits. IRSL ages ranging between 48š6 years and 1050š50 years are obtained from six samples, indicating that sediment accumulation has occurred at the two sites during the last millennia, despite a falling trend in relative sea-level in Whanganui Inlet and a stable relative sea-level at Parengarenga Harbour.
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Tom
Strony
378--390
Opis fizyczny
Bibliogr. 51 poz., rys., wykr.
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autor
autor
autor
- Department of Geography and Geology, University of Copenhagen Øster Voldgade 10, DK-1350 Copenhagen K, Denmark, atm@geo.ku.dk
Bibliografia
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- Madsen AT and Murray AS, 2009. Optically stimulated luminescence dating of young sediments: a review. Geomorphology 109(1-2): 3-16, DOI 10.1016/j.geomorph.2008.08.020.
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- Murray AS and Wintle AG, 2003. The single aliquot regenerative dose protocol: potential for improvements in reliability. Radiation Measurements 37(4-5): 377-381, DOI 10.1016/S1350-4487(03)00053-2.
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- Thomsen KJ, Murray AS, Jain M and Botter-Jensen L, 2008. Laboratory fading rates of various luminescence signals from feldspar-rich sediment extracts. Radiation Measurements 43(9-10): 1474-1486, DOI 10.1016/j.radmeas.2008.06.002.
- Wallinga J, Bos AJJ, Dorenbos P, Murray AS and Schokker J, 2007. A test case for anomalous fading correction in IRSL dating. Quaternary Geochronology 2(1-4): 216-221, DOI 10.1016/j.quageo.2006.05.014.
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWMA-0005-0008