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Chronology and glass chemistry of tephra and cryptotephra horizons from lake sediments in northern Alaska, USA

Lookup NU author(s): Dr Maarten van Hardenbroek van AmmerstolORCiD

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Abstract

Holocene tephrostratigraphy in Alaska provides independent chronology and stratigraphic correlation in a region where reworked old (Holocene) organic carbon can significantly distort radiocarbon chronologies. Here we present new glass chemistry and chronology for Holocene tephras preserved in three Alaskan lakes: one in the eastern interior, and two in the southern Brooks Range. Tephra beds in the eastern interior lake-sediment core are correlated with the White River Ash and the Hayes tephra set H (~4200-3700 cal yr BP), while an additional discrete tephra bed is likely from the Aleutian Arc-Alaska Peninsula. Cryptotephras (non-visible tephras) found in the Brooks Range include the informally named "Ruppert tephra" (~2700-2300 cal yr BP), and the Aniakchak caldera-forming event II tephra (CFE II; ~3600 cal yr BP). A third underlying Brooks Range cryptotephra is chemically indistinguishable from the Aniakchak CFE II tephra (4070-3760 cal yr BP) and is likely to be from an earlier eruption of the Aniakchak volcano.

Publication metadata

Author(s): Monteath A, van Hardenbroek M, Davies L, Froese D, Langdon PG, Xu X, Edwards ME

Publication type: Article

Publication status: Published

Journal: Quaternary Research

Year: 2017

Volume: 88

Issue: 2

Pages: 169-178

Print publication date: 01/09/2017

Online publication date: 31/07/2017

Acceptance date: 31/03/2017

Date deposited: 10/04/2017

ISSN (print): 0033-5894

ISSN (electronic): 1096-0287

Publisher: Cambridge University Press

URL: https://doi.org/10.1017/qua.2017.38

DOI: 10.1017/qua.2017.38

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