A North Atlantic tephrostratigraphical framework for 130-60 ka b2k: new tephra discoveries, marine based-correlations, and future challenges

Davies, Siwan M., Abbott, Peter M., Meara, Rhian H., Pearce, Nicholas J.G., Chapman, Mark, Austin, William E.N, Svensson, Anders, Bigler, Matthias, Rasmussen, Tine L., Rasmussen, Sune O. and Farmer, Elizabeth J. (2014) A North Atlantic tephrostratigraphical framework for 130-60 ka b2k: new tephra discoveries, marine based-correlations, and future challenges. Quaternary Science Reviews, 106. pp. 101-121. ISSN 0277-3791

Full text not available from this repository. (Request a copy)

Abstract

Building chronological frameworks for proxy sequences spanning 130–60 ka b2k is plagued by difficulties and uncertainties. Recent developments in the North Atlantic region, however, affirm the potential offered by tephrochronology and specifically the search for cryptotephra. Here we review the potential offered by tephrostratigraphy for sequences spanning 130–60 ka b2k. We combine newly identified cryptotephra deposits from the NGRIP ice-core and a marine core from the Iceland Basin with previously published data from the ice and marine realms to construct the first tephrostratigraphical framework for this time-interval. Forty-three tephra or cryptotephra deposits are incorporated into this framework; twenty three tephra deposits are found in the Greenland ice-cores, including nine new NGRIP tephras, and twenty separate deposits are preserved in various North Atlantic marine sequences. Major, minor and trace element results are presented for the new NGRIP horizons together with age estimates based on their position within the ice-core record. Basaltic tephras of Icelandic origin dominate the framework with only eight tephras of rhyolitic composition found. New results from marine core MD99-2253 also illustrate some of the complexities and challenges of assessing the depositional integrity of marine cryptotephra deposits. Tephra-based correlations in the marine environment provide independent tie-points for this time-interval and highlight the potential of widening the application of tephrochronology. Further investigations, however, are required, that combine robust geochemical fingerprinting and a rigorous assessment of tephra depositional processes, in order to trace coeval events between the two depositional realms.

Item Type: Article
Uncontrolled Keywords: tephra,cryptotephra,greenland ice-cores,north atlantic marine cores,iceland,tephra correlations,glass-shard analysis,rapid climate changes
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Pure Connector
Date Deposited: 29 Feb 2016 11:00
Last Modified: 22 Apr 2020 01:07
URI: https://ueaeprints.uea.ac.uk/id/eprint/57326
DOI: 10.1016/j.quascirev.2014.03.024

Actions (login required)

View Item View Item