Performance of different luminescence approaches for the dating of known-age glaciofluvial deposits from northern Switzerland

Geochronometria

Frank Preusser¹  Sally E. Lowick²  Dorian Gaar² 

[1] Stockholm University;University of Bern

关键词: partial bleaching;    single grains;    dose distributions;    quartz;    K-feldspar;    potassium content;   

DOI  :  10.2478/s13386-013-0139-0

学科分类：社会科学、人文和艺术（综合）

来源: Politechnika Slaska * Instytut Fizyki

【 摘 要 】

Luminescence properties of two samples taken from sand lenses in proglacial outwash de-posits of a piedmont glacier that reached the Swiss midlands during the Last Glacial Maximum are investigated in detail. Deconvolution of CW-OSL decay curves shows that the fast component dominates the OSL signal of quartz. The chemistry of single feldspar grains, in particular the K content in different grains, is determined using wavelength dispersive spectrometry (electron microprobe), revealing an average 12.9 wt.% K of the grains contributing to the IRSL signal. Dedistributions are investigated in order to gain insights into partial bleaching, and agreement is found for quartz OSL and feldspar IR50 and pIRIR225 ages for small aliquots and single grains when applying the Minimum Age Model. These ages are also consistent with independent age control. For one sample, ages determined using the Central Age Model result in highly overestimated ages for both feldspar and quartz.

【 授权许可】

Unknown