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Late Pleistocene Glaciation of the Southwestern Ahklun Mountains, Alaska

Published online by Cambridge University Press:  20 January 2017

Jason P. Briner  and
Darrell S. Kaufman
Jason P. Briner
Affiliation:
Department of Geology, Northern Arizona University, Flagstaff, Arizona, 86001-4099, E-mail: jason.briner@nau.edu
Darrell S. Kaufman
Affiliation:
Department of Geology, Northern Arizona University, Flagstaff, Arizona, 86001-4099, E-mail: jason.briner@nau.edu Department of Environmental Sciences, Northern Arizona University, Flagstaff, Arizona, 86001-4099, E-mail: darrell.kaufman@nau.edu
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Abstract

Glacial deposits in the southwestern Ahklun Mountains, southwestern Alaska, record two major glacier advances during the late Pleistocene. The Arolik Lake and Klak Creek glaciations took place during the early and late Wisconsin, respectively. During the Arolik Lake glaciation, outlet glaciers emanated from an ice cap centered over the central portion of the Ahklun Mountains and expanded beyond the present coast. During the Klak Creek glaciation, ice-cap outlet glaciers terminated ∼60 km upvalley from Arolik Lake moraines. The area also supported numerous alpine glaciers that expanded from small massifs. During both episodes of glaciation, these alpine glaciers apparently reached their maximum positions sometime after the retreat of the ice-cap outlet glaciers. Equilibrium-line altitudes for reconstructed alpine glaciers of the Klak Creek glaciation average ∼390 ± 100 m elevation in the western Ahklun Mountains, which is at most 500 m, and possibly only 200 m, below the estimated modern equilibrium-line altitude. The maximum late Pleistocene advance in the southwestern Ahklun Mountains occurred during the early Wisconsin, similar to advances elsewhere in western Alaska, but in contrast to the isotopic signal in the deep-sea record of global ice volume. The restricted extent of Klak Creek glaciers might reflect the increased distance to the Bering Sea resulting from eustatic sea-level regression and decreased evaporation resulting from lower sea-surface temperatures and increased sea-ice extent.

Type
Research Article
Information
Quaternary Research , Volume 53 , Issue 1 , January 2000 , pp. 13 - 22
Copyright
University of Washington

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References

Bartlein, P.J, Anderson, K.H, Anderson, P.M, Edwards, M.E, Mock, C.J, Thompson, R.S, Webb, R.S, Webb, T III, Whitlock, C, (1998). Paleoclimate simulations for North America over the past 21,000 years: Features of the simulated climate and comparisons with paleoenvironmental data. Quaternary Science Reviews 17, 549–585.Google Scholar
Briner, J.P, (1998). Late Pleistocene glacial chronology of the western Ahklun Mountains, southwestern Alaska. Utah State University, .Google Scholar
Broecker, W.S, (1997). Mountain glaciers: Recorders of atmospheric water vapor content. Global Biogeochemical Cycles 11, 589–596.Google Scholar
Broecker, W.S, Denton, G.H, (1990). The role of ocean-atmosphere reorganizations in glacial cycles. Quaternary Science Reviews 9, 305–343.Google Scholar
Coulter, H.W, Hopkins, D.M, Karlstrom, T.N.V, Péwé, T.L, Wahrhaftig, C, Williams, J.R, (1965). Map showing glacial extents in Alaska. U.S. Geological Survey Miscellaneous Geologic Investigations Map I-425 .Google Scholar
Fairbanks, R.D, (1989). A 17,000-year glacio-eustatic sea level record; Influence of glacial melting rates and the Younger Dryas event and deep ocean circulation. Nature 342, 342–367.Google Scholar
Gillespie, A, Molnar, P, (1995). Asynchronous maximum advances of mountain and continental glaciers. Reviews of Geophysics 33, 311–364.CrossRefGoogle Scholar
Hamilton, T.D, Late Cenozoic glaciation of Alaska. Plafker, G, Berg, H.C, (1994). The Geology of Alaska. Geological Society of America, Boulder.813–844.Google Scholar
Hamilton, T.D, Porter, S.C, (1975). Itkillik glaciation in the Brooks Range, northern Alaska. Quaternary Research 5, 471–497.Google Scholar
Hoare, J.M, Coonrad, W.L, (1961). Geological map of the Goodnews Quadrangle, Alaska. U.S. Geological Survey Miscellaneous Geologic Investigations Map I-339 .Google Scholar
Hopkins, D.M, (1982). Aspects of the paleogeography of Beringia during the late Pleistocene. Hopkins, D.M, Matthews, J.M Jr., Schweger, C.E, Young, S.B, Paleoecology of Beringia Academic Press, New York.3–28.Google Scholar
Kaufman, D. S, Manley, W. F, Forman, S, Layer, P., (In press),Pre-Late-Wisconsin glacial history, coastal Ahklun Mountains, southwestern Alaska—New amino acid, thermoluminescence, and 40Ar/39Ar results. Quaternary Science Reviews. .Google Scholar
Kaufman, D.S, Forman, S.L, Lea, P.D, Wobus, C.W, (1996). Age of pre-late-Wisconsin glacial-estuarine sedimentation, Bristol Bay, Alaska. Quaternary Research 45, 59–72.Google Scholar
Kaufman, D.S, Hopkins, D.M, (1986). Glacial history of the Seward Peninsula. Hamilton, T.D, Reed, K.M, Thorson, R.M, Glaciation in Alaska, the Geologic Record Alaska Geological Society, Anchorage.51–77.Google Scholar
Manley, W.F, Kaufman, D.S, Briner, J.P, (1997). GIS determination of late Wisconsin equilibrium line altitudes in the Ahklun Mountains of southwestern Alaska. Geological Society of America Abstracts with Programs 29, 33.Google Scholar
Manley, W. F, Kaufman, D. S, Briner, J. P., (In press),Late Quaternary glacier fluctuations in the southern Ahklun Mountains, southeast Beringia—soil development, morphometric, and radiocarbon constraints. Quaternary Science Reviews. .Google Scholar
Mann, D.H, Peteet, D.M, (1994). Extent and timing of the Last Glacial Maximum in southwestern Alaska. Quaternary Research 42, 136–148.CrossRefGoogle Scholar
Meierding, T.C, (1982). Late Pleistocene glacial equilibrium-line altitudes in the Colorado Front Range: A comparison of methods. Quaternary Research 18, 289–310.Google Scholar
Paterson, W.S.B, (1981). The Physics of Glaciers. Pergamon Press, Tarrytown.Google Scholar
Porter, S.C, (1967). Glaciation of Chagvan Bay area, southwestern Alaska. Arctic 20, 227–246.Google Scholar
Porter, S.C, Pierce, K.L, Hamilton, T.D, (1983). Late Wisconsin mountain glaciation in the western United States. Wright, H.E Jr., Late Quaternary Environments of the United States. Univ. of Minnesota Press, Minneapolis.71–111.Google Scholar
Sancetta, C.A, Heusser, L, Labeyrie, L, Naidu, A.S, Robinson, S.W, (1984). Wisconsin–Holocene paleoenvironment of the Bering Sea; Evidence from diatoms, pollen, oxygen isotopes and clay minerals. Marine Geology 62, 55–68.CrossRefGoogle Scholar
Shackelton, N.J, Opdyke, N.D, (1973). Oxygen isotope and paleomagnetic stratigraphy of equatorial Pacific core V28-238: Oxygen isotope temperatures and ice volumes on a 105 and 106 year scale. Quaternary Research 3, 39–55.CrossRefGoogle Scholar
Stillwell, K.B, Kaufman, D.S, (1996). Late Wisconsin glacial history of the northern Alaska Peninsula, southwestern Alaska, U.S.A. Arctic and Alpine Research 28, 475–487.Google Scholar
Stuiver, M, Reimer, P.J, (1993). Extended 14C data base and revised CALIB 3.0 14C age calibration program. Radiocarbon 35, 215–230.Google Scholar
Torsnes, I, Rye, N, Nesje, A, (1993). Modern and Little Ice Age equilibrium-line altitudes on outlet valley glaciers from Jostedalsbreen, western Norway; An evaluation of different approaches to their calculation. Arctic and Alpine Research 25, 106–116.Google Scholar