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

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 re...

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Bibliographic Details
Main Authors: Abbott, P.M., Schüpbach, S., Svensson, A., Seierstad, I.K., Bourne, A.J., Cook, E., Steffensen, J.P., Davies, S.M., Fischer, H.
Format: Text
Language:English
Published: Pergamon 2015
Subjects:
530 Physics
Greenland
Katla
Dye 3
Dye-3
Greenland ice cores
GRIP
ice core
Iceland
NGRIP
Online Access:https://dx.doi.org/10.7892/boris.70071
http://boris.unibe.ch/70071/
Description
Summary: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 ...

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