Luminescence and radiocarbon dates from alluvial sediments, Podhale, Central Europe — A methods comparison

放射性碳年代测定 地质学 冲积层 冲积扇 古生物学 热释光年代测定 地球化学 考古 地貌学 沉积岩 地理
作者
Janusz Olszak,Józef Kukulak,Helena Alexanderson,Marek Krąpiec,Edit Thamó‐Bozsó,Agnieszka Ciurej
出处
期刊:Catena [Elsevier BV]
卷期号:221: 106792-106792 被引量:2
标识
DOI:10.1016/j.catena.2022.106792
摘要

• Age determinations range from 26.9 to 2.27 ka which are in good geochronological order. • Some sediments suffer from incomplete zeroing. • An age reversal of sediments is recorded. • At a site organic matter redeposition is inferred based on OSL determination. Optically stimulated luminescence (OSL) and radiocarbon ( 14 C) techniques were employed to investigate the absolute ages of alluvial sediments in Podhale in the West Carpathians, southern Poland. This is an approach to (i) testing the credibility of the above dating methods by their reciprocal age control and (ii) further implications to regional geochronology and to dating campaigns of alluvial sequences elsewhere. Nine geological sections comprised of mineral and organic material were selected for the study. Our age determinations range from 26.9 to 2.27 ka, and are in good geochronological order. OSL age estimates show good agreement with independent ages from radiocarbon dating. However, in three alluvial successions the discrepancy between the resulting ages is considerable. We attribute the difference to the partial bleaching, and organic material redeposition. We also report on an age reversal of sediments in a single geological section. This might have been resulted from the alluviation-erosion scheme of meandering rivers over a millennial time-scale, i.e. the dominance of channel migration, point bar deposition (lateral accretion), and crosswise erosion. Finally, new geochronological data are provided abolishing sediment age assumptions based on uncertain chronostratigraphical approaches.
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