Pre-late-Wisconsin glacial history, coastal Ahklun Mountains, southwestern Alaska - New amino acid, thermoluminescence, and 40 Ar/39 Ar results

Darrell S. Kaufman, William F. Manley, Steve L. Forman, Paul W. Layer

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

New stratigraphic and geochronologic data from the Togiak Bay area of southwestern Alaska indicate that glaciers advanced from the southern Ahklun Mountains at least three and as many as six times prior to the late Wisconsin. The oldest glaciations are represented by glacial-marine sediment in coastal exposures on Hagemeister Island. The extent of amino acid (isoleucine) epimerization in fossil molluscs indicates that at least one, and possibly four, older middle Pleistocene glacial intervals are represented, with age estimates spanning ∼ 500-280 ka and averaging ∼ 400 ± 100 ka. The youngest glacial-marine drift on Hagemeister Island may correlate with the eruption of the Togiak tuya. A new 40 Ar/39 Ar age on basalt that overlies pillow lava indicates that the volcano erupted through glacial ice at least 300m thick 263 ± 22 ka. The youngest drift in the region overlies the Old Crow tephra (140 ± 10 ka) and a 70 ± 10 ka basaltic lava flow dated by thermoluminescence analysis of underlying baked sediment. The drift delimits flat piedmont lobes that spread out onto the continental shelf and terminated > 100 km from their source areas during the early Wisconsin (sensu lato). The glacial-geologic evidence suggests that major expansions of glaciers were out of phase with global ice volume.

Original languageEnglish (US)
Pages (from-to)337-352
Number of pages16
JournalQuaternary Science Reviews
Volume20
Issue number1-3
DOIs
StatePublished - 2001

Fingerprint

glacial history
thermoluminescence
lava
glaciers
glacier
amino acid
mountains
pillow lava
ice
history
amino acids
mountain
glacial deposit
tephra
piedmont
lava flow
mollusc
marine sediment
glaciation
continental shelf

ASJC Scopus subject areas

  • Earth-Surface Processes

Cite this

Pre-late-Wisconsin glacial history, coastal Ahklun Mountains, southwestern Alaska - New amino acid, thermoluminescence, and 40 Ar/39 Ar results. / Kaufman, Darrell S.; Manley, William F.; Forman, Steve L.; Layer, Paul W.

In: Quaternary Science Reviews, Vol. 20, No. 1-3, 2001, p. 337-352.

Research output: Contribution to journalArticle

@article{8152371724754790ab2a0ff142e0e112,
title = "Pre-late-Wisconsin glacial history, coastal Ahklun Mountains, southwestern Alaska - New amino acid, thermoluminescence, and 40 Ar/39 Ar results",
abstract = "New stratigraphic and geochronologic data from the Togiak Bay area of southwestern Alaska indicate that glaciers advanced from the southern Ahklun Mountains at least three and as many as six times prior to the late Wisconsin. The oldest glaciations are represented by glacial-marine sediment in coastal exposures on Hagemeister Island. The extent of amino acid (isoleucine) epimerization in fossil molluscs indicates that at least one, and possibly four, older middle Pleistocene glacial intervals are represented, with age estimates spanning ∼ 500-280 ka and averaging ∼ 400 ± 100 ka. The youngest glacial-marine drift on Hagemeister Island may correlate with the eruption of the Togiak tuya. A new 40 Ar/39 Ar age on basalt that overlies pillow lava indicates that the volcano erupted through glacial ice at least 300m thick 263 ± 22 ka. The youngest drift in the region overlies the Old Crow tephra (140 ± 10 ka) and a 70 ± 10 ka basaltic lava flow dated by thermoluminescence analysis of underlying baked sediment. The drift delimits flat piedmont lobes that spread out onto the continental shelf and terminated > 100 km from their source areas during the early Wisconsin (sensu lato). The glacial-geologic evidence suggests that major expansions of glaciers were out of phase with global ice volume.",
author = "Kaufman, {Darrell S.} and Manley, {William F.} and Forman, {Steve L.} and Layer, {Paul W.}",
year = "2001",
doi = "10.1016/S0277-3791(00)00112-8",
language = "English (US)",
volume = "20",
pages = "337--352",
journal = "Quaternary Science Reviews",
issn = "0277-3791",
publisher = "Elsevier Limited",
number = "1-3",

}

TY - JOUR

T1 - Pre-late-Wisconsin glacial history, coastal Ahklun Mountains, southwestern Alaska - New amino acid, thermoluminescence, and 40 Ar/39 Ar results

AU - Kaufman, Darrell S.

AU - Manley, William F.

AU - Forman, Steve L.

AU - Layer, Paul W.

PY - 2001

Y1 - 2001

N2 - New stratigraphic and geochronologic data from the Togiak Bay area of southwestern Alaska indicate that glaciers advanced from the southern Ahklun Mountains at least three and as many as six times prior to the late Wisconsin. The oldest glaciations are represented by glacial-marine sediment in coastal exposures on Hagemeister Island. The extent of amino acid (isoleucine) epimerization in fossil molluscs indicates that at least one, and possibly four, older middle Pleistocene glacial intervals are represented, with age estimates spanning ∼ 500-280 ka and averaging ∼ 400 ± 100 ka. The youngest glacial-marine drift on Hagemeister Island may correlate with the eruption of the Togiak tuya. A new 40 Ar/39 Ar age on basalt that overlies pillow lava indicates that the volcano erupted through glacial ice at least 300m thick 263 ± 22 ka. The youngest drift in the region overlies the Old Crow tephra (140 ± 10 ka) and a 70 ± 10 ka basaltic lava flow dated by thermoluminescence analysis of underlying baked sediment. The drift delimits flat piedmont lobes that spread out onto the continental shelf and terminated > 100 km from their source areas during the early Wisconsin (sensu lato). The glacial-geologic evidence suggests that major expansions of glaciers were out of phase with global ice volume.

AB - New stratigraphic and geochronologic data from the Togiak Bay area of southwestern Alaska indicate that glaciers advanced from the southern Ahklun Mountains at least three and as many as six times prior to the late Wisconsin. The oldest glaciations are represented by glacial-marine sediment in coastal exposures on Hagemeister Island. The extent of amino acid (isoleucine) epimerization in fossil molluscs indicates that at least one, and possibly four, older middle Pleistocene glacial intervals are represented, with age estimates spanning ∼ 500-280 ka and averaging ∼ 400 ± 100 ka. The youngest glacial-marine drift on Hagemeister Island may correlate with the eruption of the Togiak tuya. A new 40 Ar/39 Ar age on basalt that overlies pillow lava indicates that the volcano erupted through glacial ice at least 300m thick 263 ± 22 ka. The youngest drift in the region overlies the Old Crow tephra (140 ± 10 ka) and a 70 ± 10 ka basaltic lava flow dated by thermoluminescence analysis of underlying baked sediment. The drift delimits flat piedmont lobes that spread out onto the continental shelf and terminated > 100 km from their source areas during the early Wisconsin (sensu lato). The glacial-geologic evidence suggests that major expansions of glaciers were out of phase with global ice volume.

UR - http://www.scopus.com/inward/record.url?scp=0035134708&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035134708&partnerID=8YFLogxK

U2 - 10.1016/S0277-3791(00)00112-8

DO - 10.1016/S0277-3791(00)00112-8

M3 - Article

VL - 20

SP - 337

EP - 352

JO - Quaternary Science Reviews

JF - Quaternary Science Reviews

SN - 0277-3791

IS - 1-3

ER -