Chronology of Quaternary terrace deposits at the locality Hohle Gasse (Pratteln,NW Switzerland) |
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| Authors: | Anne Claude Naki Akçar Susan Ivy-Ochs Fritz Schlunegger Philippe Rentzel Christine Pümpin Dmitry Tikhomirov Peter W Kubik Christof Vockenhuber Andreas Dehnert Meinert Rahn Christian Schlüchter |
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| Institution: | 1.Institute of Geological Sciences,University of Bern,Bern,Switzerland;2.Laboratory of Ion Beam Physics,ETH Zurich,Zurich,Switzerland;3.Integrative Prehistory and Archaeological Science (IPNA),Basel University,Basel,Switzerland;4.Swiss Federal Nuclear Safety Inspectorate ENSI,Brugg,Switzerland;5.Department of Physics and Astronomy,Aarhus University,?rhus,Denmark |
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| Abstract: | The Quaternary stratigraphy of the Alpine Foreland consists of distinct terrace levels, which have been assigned to four morphostratigraphic units: Höhere (Higher) Deckenschotter, Tiefere (Lower) Deckenschotter, Hochterrasse (High Terrace) and Niederterrasse (Lower Terrace). Here, we focus on the terrace gravels at Hohle Gasse, SSE of Pratteln near Basel, which are mapped as Tiefere Deckenschotter. Petrographic and morphometric data established from clasts allowed to infer the transport mechanisms and sources of the gravels. Sedimentological analyses indicate that the gravels were transported by a braided river and deposited in a distal glaciofluvial setting. In addition, it can be shown that the majority of the clasts display multiple reworking and only a minority maintained a distinct glaciofluvial shape. Cosmogenic multi-isotope dating using 10Be and 36Cl allowed direct dating of the sediments at the study site. A depth-profile age of \(2 70_{ - 1 90}^{ + 8 30}\) ka for 10Be was achieved for the deposits at Hohle Gasse. Unfortunately, no age could be modelled from the 36Cl concentrations as the blank correction was too high. Furthermore, this age proves that the studied terrace level should be assigned to the morphostratigraphic unit Hochterrasse. |
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