First identification of cryptotephra from the Kamchatka Peninsula in a Greenland ice core: Implications of a widespread marker deposit that links Greenland to the Pacific northwest

Highlights • Widespread Holocene tephra KHG, from Kamchatka, is found as a cryptotephra in the NGRIP ice-core. • This is the first identification of tephra from the Kamchatka Peninsula in Greenland ice. • NGRIP KHG has an age of 7872 ± 50 a BP and improves age models for Kamchatka. • Existing 14C ag...

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Bibliographic Details
Published in:Quaternary Science Reviews
Main Authors: Cook, Eliza, Portnyagin, Maxim, Ponomareva, Vera, Bazanova, Lilia, Svensson, Anders, Garbe-Schönberg, Dieter
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2018
Subjects:
Greenland
Kamchatka Peninsula
Pacific
Greenland ice core
ice core
Kamchatka
NGRIP
Online Access:https://oceanrep.geomar.de/id/eprint/41179/
https://oceanrep.geomar.de/id/eprint/41179/2/Cook_mmc1.docx
https://oceanrep.geomar.de/id/eprint/41179/3/Cook_mmc2.xlsx
https://oceanrep.geomar.de/id/eprint/41179/10/Cook.pdf
https://doi.org/10.1016/j.quascirev.2017.11.036
Description
Summary:Highlights • Widespread Holocene tephra KHG, from Kamchatka, is found as a cryptotephra in the NGRIP ice-core. • This is the first identification of tephra from the Kamchatka Peninsula in Greenland ice. • NGRIP KHG has an age of 7872 ± 50 a BP and improves age models for Kamchatka. • Existing 14C age estimates for the KHG eruption are too young. Abstract Contiguous sampling of Holocene ice from the NGRIP core, Greenland, has revealed a new rhyolitic cryptotephra that is geochemically identical to the KHG tephra, a widespread marker deposit originating from the Khangar volcano, Kamchatka. This is the first identification of tephra from the Kamchatka Peninsula in Greenland ice and the first finding of the KHG tephra outside Kamchatka. The NGRIP KHG has an age of 7872 ± 50 a BP 1950, and this date will help improve age models for Kamchatka, where existing age estimates of KHG are too young, thus highlighting the importance of locating long-range, low-concentration cryptotephra deposits in well-dated ice cores. In Greenland KHG is located close to the termination of the 8.2 ka BP cooling event that is also a climate feature in palaeo-records of Kamchatka. This tie-point therefore provides a unique opportunity to synchronise records of environmental change in distal locations.

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