Revisiting the loess/palaeosol sequence in Paks, Hungary: A post-IR IRSL based chronology for the 鈥榊oung Loess Series鈥?/span>

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• 作者：Christine Thiel ; Erzs茅bet Horv谩th ; Manfred Frechen
• 刊名：Quaternary International
• 出版年：15 January, 2014
• 年：2014
• 卷：319
• 期：Complete
• 页码：88-98
• 全文大小：2609 K

文摘

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; pIRIR₂₉₀) dating to the uppermost 20聽m of the loess sequence at Paks. The pIRIR₂₉₀ 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 pIRIR₂₉₀ signal was reset prior to deposition. Our pIRIR₂₉₀ 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 鈥榮tandard鈥?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 pIRIR₂₉₀ signal approaches saturation.