Comparing different post-IR IRSL approaches for the dating of Holocene coastal foredunes from Ruhnu Island, Estonia

Abstract

From the bleaching experiments it is inferred that the higher values observed for post-IR IRSL at more elevated stimulation temperatures (225°C/290°C) are likely related to either thermal transfer and/or slow-to-bleach components within the signal. For the dating of the Holocene foredune sequence of Ruhnu Island, the post-IR IRSL (150°C) approach is preferred and these agree with the limited independent age control available from radiocarbon dating. Accordingly, the sequence formed between ca. 7.0 ka and 2.5 ka ago.

The Southern Westerlies in Central Chile during the two last glacial cycles as documented by coastal aeolian sand deposits and intercalating palaeosols

“…3). A tendency for residual doses to grow with D e could also be observed by other authors (Sohbati et al, 2011;Buylaert et al, 2012;Preusser et al, 2014). It is unlikely that the residual dose prior to deposition is related to the subsequent burial dose and therefore the measured residuals here might reflect a hard-to-bleach component of the signal rather than an actual residual that has to be subtracted.…”

Luminescence dating of Holocene beach-ridge sands on the Yumigahama Peninsula, western Japan

“…If this excess is assumed to be the residual dose, the age obtained for sample YG-1 with a lower dose rate is about 290 years (Table 1), which is still insufficient to account for the overestimate. It is thus likely that the g-values we obtained do not represent the rate of anomalous fading during geological storage, as has been reported elsewhere (e.g., Wallinga et al, 2007;Kars et al, 2012;Preusser et al, 2014). For high gvalues, slight inaccuracies in their determination result in large errors in the corrected age estimate; for example, using a slightly lower g-value of 10%/decade would result in a corrected age for sample YG-1 of c. 6.7 ka, which better fits the sea-level curve of Fig.…”

“…The use of post-infrared (post-IR) infrared stimulated luminescence (IRSL) of K-feldspar at relatively low temperatures (Thomsen et al, 2008;Reimann et al, 2011b) has reduced the undesirable effects of both anomalous fading and residual dose and has provided a robust method of dating Holocene sediments (e.g., Reimann and Tsukamoto, 2012;Preusser et al, 2014). However, there have been few attempts to assess the use of post-IR IRSL for dating Holocene sediments in Japan.…”

Quartz grains reveal sedimentary palaeoenvironment and past storm events: A case study from eastern Baltic

“…Assuming storm surges in the Gulf of Riga occurred at these times, they may have been responsible for the major re-blowing event of coastal foredunes, which occurred, for example, at 6.3±0.5 ka cal yr BP at Ruhnu Island, 100 km northwest of Lake Lilaste (Muru 2017;Preusser et al 2014).…”