globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2014.03.024
Scopus记录号: 2-s2.0-84924369708
论文题名:
A North Atlantic tephrostratigraphical framework for 130-60kab2k: New tephra discoveries, marine-based correlations, and future challenges
作者: Davies S.M.; Abbott P.M.; Meara R.H.; Pearce N.J.G.; Austin W.E.N.; Chapman M.R.; Svensson A.; Bigler M.; Rasmussen T.L.; Rasmussen S.O.; Farmer E.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 106
起始页码: 101
结束页码: 121
语种: 英语
英文关键词: Cryptotephra ; Glass-shard analysis ; Greenland ice-cores ; Iceland ; North Atlantic marine cores ; Rapid climate changes ; Tephra ; Tephra correlations ; Tephrostratigraphy
Scopus关键词: Climate change ; Deposition ; Deposits ; Oceanography ; Trace elements ; Cryptotephra ; Glass shards ; Greenland ice cores ; Icelands ; Marine cores ; Rapid climate change ; Tephra ; Tephra correlations ; Tephrostratigraphy ; Ice ; climate change ; depositional sequence ; future prospect ; ice core ; marine sediment ; NorthGRIP ; tephra ; tephrochronology ; uncertainty analysis ; Arctic ; Greenland ; Iceland
英文摘要: Building chronological frameworks for proxy sequences spanning 130-60kab2k 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 130-60kab2k. 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. © 2014 The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60102
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geography, College of Science, Swansea University, Singleton Park, Swansea, Wales, United Kingdom; Geography and Earth Sciences, Aberystwyth University, Llandinam Building, Penglais Campus, Aberystwyth, Wales, United Kingdom; School of Geography and Geosciences, Irvine Building, St Andrews, Scotland, United Kingdom; Scottish Association for Marine Science, Scottish Marine Institute, Oban, United Kingdom; School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, United Kingdom; Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen, Denmark; Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, Sidlerstrasse 5, Bern, Switzerland; Centre for Arctic Gas Hydrate, Environment and Climate (CAGE), Department of Geology, University of Tromsø, Tromsø, Norway; School of Geographical and Earth Sciences, University of Glasgow, Gregory Building, Lilybank Gardens, Glasgow, Scotland, United Kingdom; Department of Earth Science, University of Bergen, Allégaten 41, Bergen, Norway

Recommended Citation:
Davies S.M.,Abbott P.M.,Meara R.H.,et al. A North Atlantic tephrostratigraphical framework for 130-60kab2k: New tephra discoveries, marine-based correlations, and future challenges[J]. Quaternary Science Reviews,2014-01-01,106
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