<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>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 (&lt;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≤ 1 %/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 48±6 years and 1050±50 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.</p></abstract>

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≤ 1 %/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 48±6 years and 1050±50 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.

Luminescence dating of young coastal deposits from New Zealand using feldspar

Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350, Copenhagen K, Denmark

Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø National Laboratory for Sustainable Energy, Aarhus, Denmark

Radiation Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark (DTU), Lindholm, Kalvehave, Denmark

Geochronometria

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Luminescence dating of young coastal deposits from New Zealand using feldspar"}

A new measurement protocol has been tested on K-feldspars from Whanganui Inlet and Parengarenga Harbour, New Zealand. A Single Aliquot Regenerative (SAR) dose...

Luminescence dating of young coastal deposits from New Zealand using feldspar

Publié en ligne: 22 sept. 2011

Pages: 379 - 390

DOI: https://doi.org/10.2478/s13386-011-0042-5

Mots clés
Luminescence dating, IRSL, K-feldspar, young sediments, New Zealand

© 2011 Silesian University of Technology, Gliwice, Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Luminescence dating of young coastal deposits from New Zealand using feldspar

Publié en ligne: 22 sept. 2011

Pages: 379 - 390

DOI: https://doi.org/10.2478/s13386-011-0042-5

Mots clésLuminescence dating, IRSL, K-feldspar, young sediments, New Zealand

© 2011 Silesian University of Technology, Gliwice, Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
Luminescence dating, IRSL, K-feldspar, young sediments, New Zealand