Publication Date:
2018-05-30
Description:
Publication date: Available online 28 May 2018 Source: Quaternary Geochronology Author(s): Junjie Zhang, Sheng-Hua Li Standardised growth curves (SGCs) were established for extracts of potassium feldspar (K-feldspar), plagioclase and polymineral grains from various geological settings (deserts, loess, lake or fluvial deposits) from Northern China. Single-aliquot regenerative-dose (SAR) protocol was used with the measurements of multiple elevated temperature post-IR IRSL (MET-pIRIR) signals from 50 °C to 250 °C with an interval of 50 °C. Regenerative-dose normalisation was applied for the SGC construction. The shapes of the SGCs of K-feldspar vary between IRSL signals measured at different temperatures. For coarse grains (63–180 μm), the SGCs of the K-feldspar, plagioclase and polymineral fractions are close to each other. However, the polymineral fine grains (4–11 μm) have a distinct SGC from the coarse-grain fractions. It may be caused by the difference in alpha irradiation. Two test doses (145 Gy and 72.5 Gy) were applied to construct the SGCs of K-feldspar. The SGC built with the larger test dose has a larger characteristic saturation dose ( D 0 ). Test dose used for equivalent dose ( D e ) measurements need to be the same as the test dose used for SGC construction, otherwise the SGC D e may not be accurately estimated. With the same test dose used, the SGC D e values estimated from the SGCs are identical with the D e values generated from individual dose response curves.
Print ISSN:
1871-1014
Electronic ISSN:
1878-0350
Topics:
Geosciences
