Age, origin and significance of a new middle MIS 3 tephra horizon identified within a long-core sequence from Les Echets, France |
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| Authors: | DANIEL VERES SIWAN M DAVIES BARBARA WOHLFARTH FRANK PREUSSER STEFAN WASTEGÅRD LINDA AMPEL ANNE HORMES GÖRAN POSSNERT JEAN-PAUL RAYNAL GÉRARD VERNET |
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| Institution: | 'Emil Racovita' Speleological Institute, Clinicilor 5, 400006 Cluj, Romania and Stockholm University, Department of Physical Geography and Quaternary Geology, SE-10691 Stockholm, Sweden;;School of the Environment and Society, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, Wales, UK;;Department of Geology and Geochemistry, SE-10691 Stockholm, Sweden;;Institut für Geologie, Universität Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland;;Stockholm University, Department of Physical Geography and Quaternary Geology, SE-10691 Stockholm, Sweden;;Quaternary Geology, The University Centre in Svalbard, P.O. Box 156, NO-9171 Longyearbyen, Norway;;Ångströmlaboratory, Uppsala University, P.O. Box 534, SE-75121 Uppsala, Sweden;;CNRS UMR 5199 PACEA, Universitéde Bordeaux I, IPGQ, Avenue des facultés, F-33405 Talence, France;;CNRS UMR 6042, NRAP, rue du Mont Mouchet 7, F-63320 Chadeleuf, France |
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| Abstract: | A new tephra has been identified within a long core (EC 3) sequence recovered from Les Echets, near Lyon, France. This visible tephra was discovered as part of a high resolution multiproxy re-investigation of the Les Echets sequence. Independent chronological information suggests that the tephra is c . 2 000–45 000 years old, and geochemical analysis indicates that it is of basanitic composition. The latter suggests a possible origin in the Eifel; however, as yet, no other volcanic events or deposits can be correlated to the Les Echets tephra. New sedimentological and chronological data are presented indicating that the tephra falls within an interval that most likely correlates with Dansgaard–Oeschger events 12-9. Thus, this tephra could potentially be an important middle MIS 3 marker horizon in central Europe if it can be traced in other palaeorecords. |
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