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A detailed framework of Marine Isotope Stages 4 and 5 volcanic events recorded in two Greenland ice-cores
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2012 (English)In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 36Article in journal (Refereed) Published
Abstract [en]

Sulphate records from Greenland ice-cores indicate that Marine Isotope Stages 4 and 5 were charactensed by a higher incidence of large volcanic eruptions than other periods during the last glacial period, however, few investigations have focused on tephra deposits associated with these volcanic eruptions and the nature and origin of the events. Here we present a detailed tephrochronological framework of the products of 15 volcanic events spanning this interval: the majority of which have been preserved as cryptotephra horizons within the Greenland records. The major element compositions of individual glass shards within these horizons indicate that 13 of the eruptions originated from Iceland and 6 of these events can be correlated to the specific volcanic systems of Katla, Grimsvotn, Grimsvotn-Kverkfjoll and either Reykjanes or Veidivotn-Bardarbunga. For the remaining Icelandic horizons a source from either the rift zone or a flank zone can be suggested based on rock suite affinities. Two horizons have been correlated to a source from the Jan Mayen volcanic system which represents the first discovery of material from this system within any Greenland ice-cores. The robust geochemical characterisations, independent ages for these horizons (derived from the GICCO5 ice-core chronology) and stratigraphic positions relative to the Dansgaard-Oeschger climate events recorded in the Greenland ice-cores represent a critical framework that provides new information on the frequency and nature of volcanic events occurring in the North Atlantic region during MIS 4 and 5. This framework can now be utilised in the assessment of the differential timing and rate of response to the millennial-scale climatic events that characterised this period, through the use of the tephra horizons as time-synchronous tie-lines to other palaeoclimatic sequences. (C) 2011 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2012. Vol. 36
Keyword [en]
Cryptotephra Geochemical characterisation Iceland Jan Mayen Integrating palaeoclimatic records glacial-interglacial transition north-atlantic region glass shards tephra deposits ash layers jan-mayen numerical considerations geochemical analysis explosive volcanism distal microtephra Physical Geography Geology
Research subject
SWEDARCTIC
Identifiers
URN: urn:nbn:se:polar:diva-1880DOI: 10.1016/j.quascirev.2011.05.001OAI: oai:DiVA.org:polar-1880DiVA: diva2:810844
Note

ISI Document Delivery No.: 912UC Times Cited: 23 Cited Reference Count: 75 Abbott, Peter M. Davies, Siwan M. Steffensen, Jorgen Peder Pearce, Nicholas J. G. Bigler, Matthias Johnsen, Sigfus J. Seierstad, Inger K. Svensson, Anders Wastegard, Stefan Svensson, Anders/A-2643-2010; Pearce, Nicholas/B-5295-2009; Davies, Siwan/E-6915-2011; Wastegard, Stefan/G-5720-2012; Abbott, Peter/B-6769-2013 Svensson, Anders/0000-0002-4364-6085; Davies, Siwan/0000-0003-0999-7233; Abbott, Peter/0000-0002-6347-9499 Denmark (SNF); Belgium (FNRS-CFB); France (IFRTP and INSU/CNRS); Germany (Awl); Iceland (Rannls); Japan (MEXT); Sweden (SPRS); Switzerland (SNF); United States of America (NSF); Greenland Ice Core Project (GRIP); European Science Foundation; NERC [NER/S/A/2005/13417, NE/D000416/1, E/F020600/1, NE/F021445/1, NE/F02116X/1]; Climate Change Consortium of Wales (C3W) This work is a contribution to the NorthGRIP ice-core project, which is directed and organised by the Center for Ice and Climate at the Niels Bohr Institute, University of Copenhagen. It is being supported by funding agencies in Denmark (SNF), Belgium (FNRS-CFB), France (IFRTP and INSU/CNRS), Germany (Awl), Iceland (Rannls), Japan (MEXT), Sweden (SPRS), Switzerland (SNF) and the United States of America (NSF). This work is also a contribution to the Greenland Ice Core Project (GRIP) a European Science Foundation programme with 8 nations (Belgium, Denmark, France, Germany, Iceland, Italy, Switzerland and United Kingdom) and EC collaboration to drill through the central part of the Greenland ice sheet.PMA's work was supported by a NERC PhD studentship (NER/S/A/2005/13417). SMD acknowledges the support of NERC grant NE/D000416/1 and the Climate Change Consortium of Wales (C3W). PMA, SMD and NJGP's work is also supported by NERC (NE/F020600/1, NE/F021445/1, NE/F02116X/1). We would like to thank Dr David Steele and Dr Chris Hayward for their assistance with the use of the electron microprobe at the Tephrochronology Analytical Unit, University of Edinburgh. Thanks also to Lars Berg Larsen for help in the sampling of ice-cores and Oliver Lake and Gareth James for laboratory assistance. Thanks to Wolfgang Muller and Ian Matthews for their comprehensive comments that have helped to improve this paper. This paper contributes to the INTREPID project (Enhancing tephrochronology as a global research tool through improved fingerprinting and correlation techniques and uncertainty modelling - an INQUA INTAV-led project (International Focus Group on Tephrochronology and Volcanism, project no. 0907). 23 Pergamon-elsevier science ltd Oxford Si Geography, Physical; Geosciences, Multidisciplinary

Available from: 2015-05-08 Created: 2015-05-06 Last updated: 2015-05-08Bibliographically approved

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