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Chronology and glass chemistry of tephra and cryptotephra horizons from lake sediments in northern Alaska, U.S.A.

Chronology and glass chemistry of tephra and cryptotephra horizons from lake sediments in northern Alaska, U.S.A.
Chronology and glass chemistry of tephra and cryptotephra horizons from lake sediments in northern Alaska, U.S.A.
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.
tephra, tephrochronology, Alaska, Holocene, Brooks Range, Eastern Interior, Aniakchak, Taphonomy
0033-5894
169-178
Monteath, Alistair
51195e1e-5ac5-4845-a4fc-e9f86862a2db
van Hardenbroek, M.
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Davies, Lauren
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Froese, Duane
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Langdon, Peter
95b97671-f9fe-4884-aca6-9aa3cd1a6d7f
Xu, Xiaomei
73f5afce-fef4-421b-90ea-d5de42054820
Edwards, Mary
4b6a3389-f3a4-4933-b8fd-acdfef72200e
Monteath, Alistair
51195e1e-5ac5-4845-a4fc-e9f86862a2db
van Hardenbroek, M.
7ddff57e-78f7-444a-a3fc-946ef7f7bbfc
Davies, Lauren
474c80dd-9c74-44ba-92fc-1b4885031608
Froese, Duane
f680a186-8426-4505-8c68-09fb85b3e5fe
Langdon, Peter
95b97671-f9fe-4884-aca6-9aa3cd1a6d7f
Xu, Xiaomei
73f5afce-fef4-421b-90ea-d5de42054820
Edwards, Mary
4b6a3389-f3a4-4933-b8fd-acdfef72200e

Monteath, Alistair, van Hardenbroek, M., Davies, Lauren, Froese, Duane, Langdon, Peter, Xu, Xiaomei and Edwards, Mary (2017) Chronology and glass chemistry of tephra and cryptotephra horizons from lake sediments in northern Alaska, U.S.A. Quaternary Research, 88 (2), 169-178. (doi:10.1017/qua.2017.38).

Record type: Article

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.

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Accepted/In Press date: 31 March 2017
e-pub ahead of print date: 31 July 2017
Published date: September 2017
Keywords: tephra, tephrochronology, Alaska, Holocene, Brooks Range, Eastern Interior, Aniakchak, Taphonomy
Organisations: Palaeoenvironment Laboratory (PLUS), Geography & Environment

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Local EPrints ID: 407681
URI: http://eprints.soton.ac.uk/id/eprint/407681
ISSN: 0033-5894
PURE UUID: c316871d-fa84-4686-8efa-d2cd9ddad745
ORCID for Peter Langdon: ORCID iD orcid.org/0000-0003-2724-2643
ORCID for Mary Edwards: ORCID iD orcid.org/0000-0002-3490-6682

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Date deposited: 22 Apr 2017 01:04
Last modified: 16 Mar 2024 05:14

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Contributors

Author: Alistair Monteath
Author: M. van Hardenbroek
Author: Lauren Davies
Author: Duane Froese
Author: Peter Langdon ORCID iD
Author: Xiaomei Xu
Author: Mary Edwards ORCID iD

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