globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.05.004
论文题名:
Re-evaluation and extension of the Marine Isotope Stage 5 tephrostratigraphy of the Faroe Islands region: The cryptotephra record
作者: Abbott P.M.; Austin W.E.N.; Davies S.M.; Pearce N.J.G.; Rasmussen T.L.; Wastega˚rd S.; Brendryen J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 409
起始页码: 153
结束页码: 168
语种: 英语
英文关键词: Iceland ; Isochrons ; Marine sequences ; Palaeoclimatic synchronisation ; Volcanic ash
英文摘要: Previous studies of marine sequences from the Faroe Islands region have identified a series of coarse-grained tephra horizons deposited during Marine Isotope Stage (MIS) 5. Here we reassess the MIS 5 tephrostratigraphy of the Faroe Islands region and focus on the cryptotephra deposits preserved within the fine-grained fraction of marine core LINK 16. We also extend the record to encompass the late MIS 6 and early MIS 4 periods. A density separation technique, commonly used for tephra investigations in lacustrine settings but rarely applied to marine sediments, is utilised to explore the fine-grained material and EPMA and LA-ICP-MS are employed to determine the major and trace element composition of individual tephra shards. In total, 3 basaltic and 3 rhyolitic Icelandic cryptotephra deposits with homogeneous geochemical compositions are identified - all of which have the potential to act as isochronous tie-lines. Geochemical results highlight that the Gri´msvo¨tn volcanic system of Iceland is the predominant source of the basaltic horizons and the O¨raefajo¨kull or Torfajo¨kull systems are the likely sources of the rhyolitic deposits. Three of the horizons have been previously recognised in Faroe Islands region marine sequences, with two of these deposits traceable into a Norwegian Sea sequence. An early MIS 4 rhyolitic horizon is the most widespread deposit as it can be traced into the Norwegian Sea and to the south into a record from the Rockall Trough. Basaltic and rhyolitic horizons deposited during late MIS 6 have not been recognised in other sequences and represent new additions to the regional tephrostratigraphy. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69302
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作者单位: Department of Geography, College of Science, Swansea University, Singleton Park, Swansea, United Kingdom; School of Geography and Geosciences, University of St. Andrews, North Street, St. Andrews, United Kingdom; Institute of Geography and Earth Sciences, Aberystwyth University, Llandinam Building, Penglais Campus, Aberystwyth, United Kingdom; Department of Geology, University of Tromsø, Tromsø, Norway; Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden; Department of Earth Science, University of Bergen, Post Box 7803, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway

Recommended Citation:
Abbott P.M.,Austin W.E.N.,Davies S.M.,et al. Re-evaluation and extension of the Marine Isotope Stage 5 tephrostratigraphy of the Faroe Islands region: The cryptotephra record[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,409
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