A tephra lattice for Greenland and a reconstruction of volcanic events spanning 25–45 ka b2k

Bourne, A.J.; Cook, E.; Abbott, P.M.; Seierstad, I.K.; Steffensen, J.P.; Svensson, A.; Fischer, H.; Schüpbach, S.; Davies, S.M. (2015). A tephra lattice for Greenland and a reconstruction of volcanic events spanning 25–45 ka b2k. Quaternary Science Reviews, 118, pp. 122-141. Pergamon 10.1016/j.quascirev.2014.07.017

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Tephra layers preserved within the Greenland ice-cores are crucial for the independent synchronisation of these high-resolution records to other palaeoclimatic archives. Here we present a new and detailed tephrochronological framework for the time period 25,000 e 45,000 a b2k that brings together results from 4 deep Greenland ice-cores. In total, 99 tephra deposits, the majority of which are preserved as cryptotephra, are described from the NGRIP, NEEM, GRIP and DYE-3 records. The major element signatures of single glass shards within these deposits indicate that 93 are basaltic in composition all originating from Iceland. Specifically, 43 originate from Grimsv € otn, 20 are thought to be sourced from the Katla volcanic system and 17 show affinity to the Kverkfj € oll system. Robust geochemical characterisations, independent ages derived from the GICC05 ice-core chronology, and the stratigraphic positions of these deposits relative to the Dansgaard-Oeschger climate events represent a key framework that provides new information on the frequency and nature of volcanic events in the North Atlantic region between GS-3 and GI-12. Of particular importance are 19 tephra deposits that lie on the rapid climatic transitions that punctuate the last glacial period. This framework of well-constrained, time-synchronous tie-lines represents an important step towards the independent synchronisation of marine, terrestrial and ice-core records from the North Atlantic region, in order to assess the phasing of rapid climatic changes during the last glacial period.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Fischer, Hubertus and Schüpbach, Simon

Subjects:

500 Science > 530 Physics

ISSN:

0277-3791

Publisher:

Pergamon

Language:

English

Submitter:

Doris Rätz

Date Deposited:

03 Jul 2015 14:20

Last Modified:

06 Jul 2016 20:42

Publisher DOI:

10.1016/j.quascirev.2014.07.017

BORIS DOI:

10.7892/boris.70071

URI:

https://boris.unibe.ch/id/eprint/70071

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