Last glacial period cryptotephra deposits in an eastern North Atlantic marine sequence: Exploring linkages to the Greenland ice-cores |
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| Institution: | 1. Department of Geography, College of Science, Swansea University, Singleton Park, Swansea, SA2 8PP, UK;2. School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey, LL59 5AB, UK;3. Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, UK;1. Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark;2. Climate and Environmental Physics, Physics Institute and Oeschger Center for Climate Change Research, University of Bern, 3012 Bern, Switzerland;3. Centre for Quaternary Research, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK;4. Department of Global Ecology, Carnegie Institution for Science, 260 Panama St., Stanford, CA 94305, USA;5. Laboratoire des Sciences du Climat et de l''Environnement, UMR CEA/CNRS/UVSQ, Orme des Merisiers, F-91191 CEDEX, Gif sur Yvette, France;6. Department of Physical Geography, Faculty of Geosciences, Utrecht University, Postbus 80.115, 3508TC Utrecht, The Netherlands;7. Joint Institute for the Study of the Atmosphere and Ocean (JISAO), University of Washington, Seattle, WA 98195-5672, USA;8. School of Archaeology, History, and Anthropology, Trinity Saint David, University of Wales, Lampeter, Ceredigion, SA48 7ED Wales, UK;9. Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB Wales, UK;10. School of Mathematics and Statistics, University of Sheffield, Hounsfield Road, S3 7RH Sheffield, UK;11. Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195-1310, USA;1. Research Laboratory for Archaeology, University of Oxford, Dyson Perrins Building, South Parks Road, Oxford, OX1 3QY, UK;2. Department of Geography, Royal Holloway University of London, Egham, Surrey, TW20 0EX, UK;3. Department of Geography, The University of Manchester, Arthur Lewis Building, Oxford Road, Manchester, M13 9PL, UK;1. Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Iceland;2. Institute of Earth Sciences, University of Iceland, Iceland;3. Department of Arctic Geology, The University Center in Svalbard, Svalbard and Jan Mayen;4. Department of Geology, Quaternary Sciences, Lund University, Sweden;1. Centre for Ice and Climate, Juliane Maries Vej 30, Niels Bohr Institute, University of Copenhagen, 2100, Denmark;2. GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstraße 1-3, 24148, Kiel, Germany;3. Institute of Volcanology and Seismology, Piip Blvd, 9, Petropavlovsk-Kamchatsky, 683006, Russia;4. Christian-Albrechts-Universität zu Kiel, Christian-Albrechts-Platz 4, 24118, Kiel, Germany;1. Research Laboratory for Archaeology, University of Oxford, Dyson Perrins Building, South Parks Road, Oxford, OX1 3QY, UK;2. Department of Geography, Royal Holloway University of London, Egham, Surrey, TW20 0EX, UK;3. Department of Geography, The University of Manchester, Arthur Lewis Building, Oxford Road, Manchester, M13 9PL, UK;1. Department of Geography, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom;2. Department of Geography, Swansea University, Swansea SA2 8PP, United Kingdom |
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| Abstract: | The establishment of a tephra framework for the Greenland ice-cores spanning the last glacial period, particularly between 25 and 45 ka b2k, provides strong potential for precisely correlating other palaeoclimatic records to these key archives. Tephra-based synchronisation allows the relative timing of past climatic changes recorded within different depositional environments and potential causal mechanisms to be assessed. Recent studies of North Atlantic marine records have demonstrated the potential of tracing cryptotephra horizons in these sequences and the development of protocols now allows a careful assessment of the isochronous nature of such horizons. Here we report on tephrochronological investigations of a marine sequence retrieved from the Goban Spur, Eastern North Atlantic, covering ～25–60 ka b2k. Density and magnetic separation techniques and an assessment of potential transport and depositional mechanisms have identified three previously unknown isochronous tephra horizons along with deposits of the widespread North Atlantic Ash Zone II and Faroe Marine Ash Zone III. Correlations between the new horizons and the Greenland ice-core tephra framework are explored and despite no tie-lines being identified the key roles that high-resolution climatostratigraphy and shard-specific trace element analysis can play within the assessment of correlations is demonstrated. The previously unknown horizons are new additions to the overall North Atlantic tephra framework for the last glacial period and could be key horizons for future correlations. |
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| Keywords: | Tephrochronology Palaeoclimate synchronisation Volcanic ash Isochrons Iceland Major and trace element geochemistry |
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