A comparison of TT-OSL and post-IR IRSL dating of coastal deposits on Cap Bon peninsula, north-eastern Tunisia

Thiel, Christine; Buylaert, Jan‐Pieter; Murray, Andrew; Elmejdoub, Noureddine; Jedoui, Younes

doi:10.1016/j.quageo.2012.03.010

Cited by 56 publications

(35 citation statements)

References 35 publications

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“…4.2.1. Correcting for the impact of the lifetime of the TT-OSL signal Adamiec et al (2010) calculated the lifetime of charge in the trap responsible for the TT-OSL signal in quartz based upon laboratory experiments and obtained a value of 4.5 Ma at 10 C. Thiel et al (2012) compared ages determined using TT-OSL with those determined using the post-IR IR signal from feldspars, and assuming that the post-IR IRSL ages were correct, they saw underestimation of the TT-OSL ages consistent with the kinetic parameters calculated by Adamiec et al (2010). It therefore seems that TT-OSL ages require correction for the instability of charge in the trap responsible for the signal.…”

Section: Thermally Transferred Optically Stimulated Luminescence (Tt-mentioning

confidence: 99%

New investigations at Kalambo Falls, Zambia: Luminescence chronology, site formation, and archaeological significance

Duller

Tooth

Barham

et al. 2015

Journal of Human Evolution

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Fluvial deposits can provide excellent archives of early hominin activity but may be complex to interpret, especially without extensive geochronology. The Stone Age site of Kalambo Falls, northern Zambia, has yielded a rich artefact record from dominantly fluvial deposits, but its significance has been restricted by uncertainties over site formation processes and a limited chronology. Our new investigations in the centre of the Kalambo Basin have used luminescence to provide a chronology and have provided key insights into the geomorphological and sedimentological processes involved in site formation. Excavations reveal a complex assemblage of channel and floodplain deposits. Single grain quartz optically stimulated luminescence (OSL) measurements provide the most accurate age estimates for the youngest sediments, but in older deposits the OSL signal from some grains is saturated. A different luminescence signal from quartz, thermally transferred OSL (TT-OSL), can date these older deposits. OSL and TT-OSL results are combined to provide a chronology for the site. Ages indicate four phases of punctuated deposition by the dominantly laterally migrating and vertically aggrading Kalambo River (∼500-300 ka, ∼300-50 ka, ∼50-30 ka, ∼1.5-0.49 ka), followed by deep incision and renewed lateral migration at a lower topographic level. A conceptual model for site formation provides the basis for improved interpretation of the generation, preservation, and visibility of the Kalambo archaeological record. This model highlights the important role of intrinsic meander dynamics in site formation and does not necessarily require complex interpretations that invoke periodic blocking of the Kalambo River, as has previously been suggested. The oldest luminescence ages place the Mode 2/3 transition between ∼500 and 300 ka, consistent with other African and Asian sites where a similar transition can be found. The study approach adopted here can potentially be applied to other fluvial Stone Age sites throughout Africa and beyond.

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Section: Thermally Transferred Optically Stimulated Luminescence (Tt-mentioning

confidence: 99%

New investigations at Kalambo Falls, Zambia: Luminescence chronology, site formation, and archaeological significance

Duller

Tooth

Barham

et al. 2015

Journal of Human Evolution

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“…Stevens et al, 2011), and that in nature the pIRIR 290 signal can be re-set to a negligible value (e.g. Thiel et al, 2012), though the re-setting will be slower . It should also be noted that a thermal transfer of up to 20 Gy was observed in modern dust samples (Buylaert et al, 2011), which can have a significant influence on young (i.e.…”

Section: Post-ir Irsl Measurementsmentioning

confidence: 99%

Revisiting the loess/palaeosol sequence in Paks, Hungary: A post-IR IRSL based chronology for the ‘Young Loess Series’

Thiel

Horváth

Frechen

2014

Quaternary International

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In Hungary, many loess/palaeosol sequences have been found to be discontinuous. In order to allow for correlations with other Quaternary records, reliable chronologies are needed. We therefore apply post-IR infrared (IR) stimulated luminescence (post-IR IRSL; pIRIR 290 ) dating to the uppermost 20 m of the loess sequence at Paks. The pIRIR 290 ages are compared with blue quartz OSL ages to test for potential age overestimation due to poor signal re-setting, and the observed good agreement is taken to imply that the more difficult to bleach pIRIR 290 signal was reset prior to deposition. Our pIRIR 290 based chronology reveals that most of the Late Pleistocene loess was deposited during marine isotope stage (MIS) 3 and during the Last Glacial Maximum (LGM). This is in disagreement with formerly published ages. The discrepancy can most likely be explained by anomalous fading (resulting in an age underestimate); this conclusion is supported by our uncorrected 'standard' IRSL ages. We further confirm that the Basaharc Double soil complex can be correlated with MIS 7; the underlying loess and soils cannot be dated accurately because the pIRIR 290 signal approaches saturation. Keywords: Late Pleistocene; Middle Pleistocene; loess; OSL; post-IR IRSL; Hungary M A N U S C R I P T A C C E P T E DACCEPTED MANUSCRIPT 2 IntroductionThe importance of loess/palaeosol sequences to the reconstruction of the landscape evolution and the palaeoenviroment in the Carpathian Basin has been pointed out by several studies (e.g. Bronger, 1975Bronger, , 2003 Pécsi and Richter, 1996). In regions thought to be dominated by continuous loess deposits such as the Chinese loess plateau (e.g. Kukla, 1987) and the southeast Carpathian Basin (Vojvodina region; e.g. Marković et al., 2008Marković et al., , 2011 Fitzsimmons et al., 2012) to marine isotope stage (MIS) 13, the BA soil to MIS 11, and the BD soil complex to MIS 9 and 7. The first 'absolute' ages of the MB soil were presented by Borsy et al. (1979). At Mende ( Fig. 1), they dated the loess above the MB soil to 105 ± 17 ka using thermoluminescence (TL). In Paks (Fig. 1), the loess underlying this soil was dated to 125 ± 20 ka; they concluded that the MB soil represents the last interglacial. In contrast, Wintle and Packman (1988) argued, based on their TL data for the loess underlying the Mende Upper soil (Mende felsı; MF, also subdivided into MF 1 and MF 2 ), that the MB cannot be correlated with the last interglacial, but has to be much older. Singhvi et al. (1989) claimed that the BD 2 soil (therein called F 3 after Bronger (1975)) corresponds to the last interglacial. Several studies (Zöller et al., 1994; Oches and McCoy, 1995;Frechen et al., 1997; Novothny et al., 2002) have now identified the MF 2 as the last interglacial palaeosol, thus placing the BD 1 -BD 2 soil complex, the BA and the MB soil all in the Middle Pleistocene. Zöller et al. (1994) presented TL ages of 133 ± 15 ka (between BD 1 and BD 2 ) and 135 ± 12 ka (below BD 2 ) for the sequence in Basaharc (Fig. 1...

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“…Although this suggested that a pulsedirradiation protocol was necessary for the older samples in that study, subsequent investigations and applications of the TT-OSL signal have used only constant-irradiation protocols. In agreement with Wang et al (2006a), most of these subsequent investigations have been unable to successfully date an older sample (>400 Gy) with independent age control (Duller and Wintle, 2012;Thiel et al, 2012). However, one recent investigation using constant irradiation has reported two older ages (w700 and w1000 ka) in agreement with independent UePb ages and palaeomagnetic reversals (Pickering et al, 2013).…”

Section: Introductionmentioning

confidence: 95%

Assessing the impact of pulsed-irradiation procedures on the thermally transferred OSL signal in quartz

Chapot

Duller

Roberts

2014

Radiation Measurements

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Chapot, M. S., Duller, G. A. T., & Roberts, H. M. (2014). Assessing the impact of pulsed-irradiation procedures on the thermally transferred OSL signal in quartz. Radiation Measurements, 65, 1-7Thermally transferred optically stimulated luminescence (TT-OSL) dating protocols have been suggested as a means of extending the age range of luminescence dating. Several studies demonstrate that TT-OSL signals increase with large radiation doses (>2000 Gy) and yet, few studies report older TT-OSL ages (>400 Gy) in agreement with independent absolute age control. In one such study, agreement with independent chronology was only achieved for the old samples by implementing a pulsed-irradiation procedure. Pulsed-irradiation is suggested to compensate for dose rate dependent competition effects by dividing the laboratory irradiation into discrete irradiation steps interspersed with heat treatments. However, every inter-step heat treatment has the potential to anneal part of the TT-OSL dating signal. This study compares constant- and pulsed-irradiation TT-OSL protocols and investigates the degree of partial thermal annealing. The results suggest that almost all of the difference in outcome between constant- and pulsed-irradiation protocols can be explained by partial annealing of the TT-OSL signal rather than by competition effects. Partial annealing distorts the laboratory dose response curve but has no impact on the natural signal, resulting in unreliable equivalent dose estimates. This means that pulsed-irradiation procedures may not be viable for TT-OSL dating measurements. Future studies implementing pulsed-irradiation procedures should carefully consider the extent to which inter-step thermal treatments partially anneal the signal.authorsversionPeer reviewe

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A comparison of TT-OSL and post-IR IRSL dating of coastal deposits on Cap Bon peninsula, north-eastern Tunisia

Cited by 56 publications

References 35 publications

New investigations at Kalambo Falls, Zambia: Luminescence chronology, site formation, and archaeological significance

New investigations at Kalambo Falls, Zambia: Luminescence chronology, site formation, and archaeological significance

Revisiting the loess/palaeosol sequence in Paks, Hungary: A post-IR IRSL based chronology for the ‘Young Loess Series’

Assessing the impact of pulsed-irradiation procedures on the thermally transferred OSL signal in quartz

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