Luminescence dating of glaciolacustrine silt in overdeepened basin fills beyond the last interglacial

Buechi, Marius W.; Lowick, Sally; Anselmetti, Flavio (2017). Luminescence dating of glaciolacustrine silt in overdeepened basin fills beyond the last interglacial. Quaternary geochronology, 37, pp. 55-67. Elsevier 10.1016/j.quageo.2016.09.009

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Abstract {OSL} and {IRSL} dating are applied to samples from a 152 m-long drill core to constrain the timing of three glaciolacustrine depositional periods within the infill of an overdeepened bedrock trough in the Lower Glatt valley, N Switzerland. The characterisation of the dose-response suggests that the polymineral {IRSL50} and pIRIR180/225 signals are close to saturation, while quartz {OSL} ages are within the range of reliable dating. The demarcation of the upper quartz {OSL} dating limit, however, remains challenging. Dose-recovery tests performed with long storage periods were used to investigate the reliability of the high region of the dose-response curve. They suggest an upper limit for reliable dating of ~400 Gy for these samples, which was considerably lower than the commonly used 2D0 criterion. Lifetimes were calculated for the quartz {OSL} and the thermal stability of the signal is not considered as problematic for the determined ages. Allowing for a contribution from inherited dose due to partial bleaching, places the infill of the overdeepened valley within the penultimate glacial cycle (MIS6).

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology

UniBE Contributor:

Büchi, Marius; Lowick, Sally and Anselmetti, Flavio

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

1871-1014

Publisher:

Elsevier

Language:

English

Submitter:

Marius Büchi

Date Deposited:

15 Nov 2016 16:05

Last Modified:

08 May 2017 15:07

Publisher DOI:

10.1016/j.quageo.2016.09.009

Uncontrolled Keywords:

Quartz OSL, Saturation, Dose response, Partial bleaching, Glaciolacustrine deposits, MIS6

BORIS DOI:

10.7892/boris.89490

URI:

https://boris.unibe.ch/id/eprint/89490

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