Tectonic and climatic control on terrace formation: Coupling in situ produced 10Be depth profiles and luminescence approach, Danube River, Hungary, Central Europe - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Quaternary Science Reviews Année : 2016

Tectonic and climatic control on terrace formation: Coupling in situ produced 10Be depth profiles and luminescence approach, Danube River, Hungary, Central Europe

Résumé

The terrace sequence of the Hungarian part of the Danube valley preserves a record of varying tectonic uplift rates along the river course and throughout several climate stages. To establish the chronology of formation of these terraces, two different dating methods were used on alluvial terraces: exposure age dating using in situ produced cosmogenic Be-10 and luminescence dating. Using Monte Carlo approach to model the denudation rate-corrected exposure ages, in situ produced cosmogenic Be-10 samples originated from vertical depth profiles enabled the determination of both the exposure time and the denudation rate. Post-IR IRSL measurements were carried out on K-feldspar samples to obtain the ages of sedimentation.The highest terrace horizon remnants of the study area provided a best estimate erosion-corrected minimum B-10 exposure age of >700 ka. We propose that the abandonment of the highest terrace of the Hungarian Danube valley was triggered by the combined effect of the beginning tectonic uplift and the onset of major continental glaciations of Quaternary age (around MIS 22). For the lower terraces it was possible to reveal close correlation with MIS stages using IRSL ages. The new chronology enabled the distinction of tIIb (similar to 90 ka; MIS 5b-c) and tIIIa (similar to 140 ka; MIS 6) in the study area. Surface denudation rates were well constrained by the cosmogenic Be-10 depth profiles between 5.8 m/Ma and 10.0 m/Ma for all terraces. The calculated maximum incision rates of the Danube relevant for the above determined >700 Ka time span were increasing from west (<0.06 mm/a) to east (<0.13 mm/a), toward the more elevated Transdanubian Range. Late Pleistocene incision rates derived from the age of the low terraces (similar to 0.13-0.15 mm/a) may suggest a slight acceleration of uplift towards present
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hal-01457815 , version 1 (14-12-2023)

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Zsófia Ruszkiczay-Rüdiger, Regis Braucher, Ágnes Novothny, Gábor Csillag, László Fodor, et al.. Tectonic and climatic control on terrace formation: Coupling in situ produced 10Be depth profiles and luminescence approach, Danube River, Hungary, Central Europe. Quaternary Science Reviews, 2016, 131 (Part A), pp.127 - 147. ⟨10.1016/j.quascirev.2015.10.041⟩. ⟨hal-01457815⟩
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