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

QUATERNARY SCIENCE REVIEWS

卷:181

Article

Cook, Eliza¹  Portnyagin, Maxim²  Ponomareva, Vera³  Bazanova, Lilia³  Svensson, Anders¹  Garbe-Schoenberg, Dieter⁴ 

[1] Univ Copenhagen, Ctr Ice & Climate, Niels Bohr Inst, Julian Maries Vej 30, DK-2100 Copenhagen, Denmark

[2] GEOMAR Helmholtz Ctr Ocean Res Kiel, Wischhofstr 1-3, D-24148 Kiel, Germany

[3] Inst Volcanol & Seismol, Piip Blvd 9, Petropavlovsk Kamchatski 683006, Russia

[4] Christian Albrechts Univ Kiel, Christian Albrechts Pl 4, D-24118 Kiel, Germany

关键词: Cryptotephra;    Khangar;    Kamchatka;    Isochron;    Greenland ice core;    NGRIP;   

DOI  :  10.1016/j.quascirev.2017.11.036

来源: Elsevier

【 摘 要 】

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. (C) 2017 Elsevier Ltd. All rights reserved.

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