A sedimentary record from a deep Quaternary valley in the southern Lillebælt area, Denmark: Eemian and Early Weichselian lithology and chronology at Mommark |
| |
| Authors: | JÓN EIRÍKSSON PETER H KRISTENSEN HOLGER LYKKE-ANDERSEN KATHRYN BROOKS REW MURRAY KAREN LUISE KNUDSEN CHRISTOPHER GLAISTER |
| |
| Institution: | (e-mail: ), Earth Science Institute, Askja, University of Iceland, IS-101 Reykjavík, Iceland;Department of Earth Sciences, University of Aarhus, DK-8000 Århus C, Denmark;Cambridge Quaternary, Department of Geography, University of Cambridge, Downing Street, Cambridge CB2 3EN, UK;The Nordic Laboratory for Luminescence Dating, RisøNational Laboratory, DK-4000 Roskilde, Denmark and Department of Earth Sciences, University of Aarhus, DK-8000 Århus C, Denmark |
| |
| Abstract: | A unique sequence of Late Saalian, Eemian and Early Weichselian strata is exposed in a coastal outcrop at Mommark in the western Baltic. The sedimentary facies and faunas reflect palaeoenvironmental changes from an initial freshwater lake followed by marine transgression and interglacial deposition in a palaeo-Baltic sea. The upper part of the Eemian marine record indicates regression followed by lacustrine sedimentation and deposition of Early Weichselian aeolian sediments, which are truncated by an erosional unconformity overlain by a till bed. The lower and middle parts of the sequence have previously been correlated with the European glacial-interglacial stratigraphy on the basis of pollen analysis, while the upper part has been dated for the present study using optically stimulated luminescence (OSL) of samples from the aeolian and glacial deposits. A similar complete glacial-interglacial-glacial succession has not previously been recorded from this area. The Mommark sequence of conformable strata has been subjected to lateral compression, evidenced by folding and low-angle reverse faults. Seismic records from the adjacent waters in the western Baltic reveal a system of buried Quaternary valleys in the area. It is suggested that the interglacial deposition took place in a basin within one of these valleys and that a slab constituting the Mommark sequence, originating from the margin of a valley, has been glaciotectonically displaced northwestwards to the present location. |
| |
| Keywords: | |
| 本文献已被 InformaWorld 等数据库收录！ |
|
