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Late Pleistocene Cosmogenic 36Cl Glacial Chronology of the Southwestern Ahklun Mountains, Alaska

Published online by Cambridge University Press:  20 January 2017

Jason P. Briner ,
Terry W. Swanson  and
Marc Caffee
Jason P. Briner
Affiliation:
Department of Geological Sciences and INSTAAR, University of Colorado, Boulder, Colorado, 80309, E-mail: [email protected]
Terry W. Swanson
Affiliation:
Department of Geological Sciences and Quaternary Research Center, University of Washington, Seattle, Washington, 98195
Marc Caffee
Affiliation:
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California, 94550
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Abstract

Thirty-two cosmogenic 36Cl surface exposure ages constrain the timing of two late Pleistocene glacial advances in the western Ahklun Mountains, southwestern Alaska. Boulders were sampled from one early Wisconsin (sensu lato) and six late Wisconsin moraines deposited by ice-cap outlet glaciers and local alpine glaciers. Four moraine boulders deposited during an extensive early Wisconsin ice-cap outlet glacier advance have a mean surface exposure age of 60,300±3200 yr. A moraine deposited by an ice-cap outlet glacier during the restricted late Wisconsin advance has a mean surface exposure age of 19,600±1400 yr. Five moraines deposited by late Wisconsin alpine glaciers have mean ages that range between 30,000 and 17,000 yr. The 36Cl ages are consistent with limiting 14C and thermoluminescence ages from related deposits and indicate that Ahklun Mountains glaciers reached their most extensive position of the last glaciation early during the late Pleistocene, in contrast to the deep-sea isotopic record of global ice volume.1

Keywords

glacial chronologyAlaska36Clcosmogenic analysis
Type
Research Article
Information
Quaternary Research , Volume 56 , Issue 2 , September 2001 , pp. 148 - 154
Copyright
University of Washington

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References

Axford, Y.L. Late Quaternary Glacier Fluctuations and Vegetation Change in the Northwestern Ahklun Mountains, Southwestern Alaska. (2000). Utah State University, Google Scholar
Bierman, P.R., Marsella, K.A., Patterson, C., Davis, P.T., and Caffee, M. Mid-Pleistocene cosmogenic minimum-age limits for pre-Wisconsinan glacial surfaces in southwestern Minnesota and southern Baffin Island: A multiple nuclide approach. Geomorphology 27, (1999). 25 39.CrossRefGoogle Scholar
Briner, J.P. Late Pleistocene Glacial Chronology of the Western Ahklun Mountains, Southwestern Alaska. (1998). Utah State University, Google Scholar
Briner, J.P., and Kaufman, D.S. Late Pleistocene glaciation of the southwestern Ahklun Mountains, Alaska. Quaternary Research 53, (2000). 13 22.CrossRefGoogle Scholar
Fairbanks, R.D. A 17,000-year glacio-eustatic sea level record: Influence of glacial melting rates on the Younger Dryas event and deep ocean circulation. Nature 342, (1989). 637 642.CrossRefGoogle Scholar
Gillespie, A., and Molnar, P. Asynchronous maximum advances of mountain and continental glaciers. Reviews of Geophysics 33, (1995). 311 364.CrossRefGoogle Scholar
Gualtieri, L., Glushkova, O., and Brigham-Grette, J. Evidence for restricted ice extent during the last glacial maximum in the Koryak Mountains of Chukotka, far eastern Russia. Geological Society of America Bulletin 112, (2000). 1106 1118.2.0.CO;2>CrossRefGoogle Scholar
Hallet, B., and Putkonen, J. Surface dating of dynamic landforms: Young boulders on aging moraines. Science 268, (1994). 937 940.CrossRefGoogle Scholar
Hamilton, T.D. Late Cenozoic glaciation of the central Brooks Range. Hamilton, T.D., Reed, K.M., and Thorson, R.M. Glaciation in Alaska—The Geologic Record. (1986). Alaska Geol. Soc, Anchorage. 9 50.Google Scholar
Hamilton, T.D. Late Cenozoic glaciation of Alaska. Plafker, G., and Berg, H.C. The Geology of Alaska. (1994). Geol. Soc. Am, Boulder. 813 844.Google Scholar
Kaufman, D.S., and Hopkins, D.M. Glacial history of the Seward Peninsula. Hamilton, T.D., Reed, K.M., and Thorson, R.M. Glaciation in Alaska—The Geologic Record. (1986). Alaska Geol. Soc, Anchorage. 9 50.Google Scholar
Kaufman, D.S., Forman, S.L., Lea, P.D., and Wobus, C.W. Age of pre-late-Wisconsin glacial-estuarine sedimentation, Bristol Bay, Alaska. Quaternary Research 45, (1996). 59 72.CrossRefGoogle Scholar
Kaufman, D.S., Manley, W.F., Wofle, A.P., Hu, F.S., Preece, S.J., Westgate, J.A., and Forman, S.L. The last interglacial to glacial transition, Togiak Bay, southwestern Alaska. Quaternary Research 55, (2001). 190 202.CrossRefGoogle Scholar
Kaufman, D.S., Manley, W.F., Forman, S., and Layer, P. Pre-Late-Wisconsin glacial history, coastal Ahklun Mountains, southwestern Alaska—New amino acid, thermoluminescence, and 40Ar/39Ar results. Quaternary Science Reviews 20, (2001). 337 352.CrossRefGoogle Scholar
Lal, D. Cosmic ray labeling of erosion surfaces: In situ nuclide production rates and erosion models. Earth and Planetary Science Letters 104, (1991). 424 439.CrossRefGoogle Scholar
Manley, W.F., Kaufman, D.S., and Briner, J.P. Late Quaternary glacier fluctuations in the southern Ahklun Mountains, southeast Beringia—Soil development, morphometric, and radiocarbon constraints. Quaternary Science Reviews 20, (2001). 353 370.CrossRefGoogle Scholar
Martinson, D.G., Pisias, N.G., Hays, J.D., Imbrie, J., Moore, T.C. Jr., and Shackleton, N.J. Age dating and orbital theory of the ice ages: Development of a high-resolution 0 to 300,000-year chronostratigraphy. Quaternary Research 27, (1987). 1 29.CrossRefGoogle Scholar
Phillips, F.M., and Plummer, M.A. CHLOE: A program for interpreting in-situ cosmogenic nuclide data for surface exposure dating and erosion studies. Radiocarbon 38, (1996). 98 Google Scholar
Sancetta, C.A., Heusser, L., Labeyrie, L., Naidu, A.S., and Robinson, S.W. Wisconsin—Holocene paleoenvironment of the Bering Sea: Evidence from diatoms, pollen, oxygen isotopes and clay minerals. Marine Geology 62, (1984). 55 68.CrossRefGoogle Scholar
Swanson, T. W, and Caffee, M. (in press), Determination of 36Cl production rates from the deglaciation history of Whidbey and Fidalgo Islands, Washington. Quaternary Research.Google Scholar
Zreda, M.G., Phillips, F.M., Kubik, P.W., Sharma, P., and Elmore, D. Cosmogenic chlorine-36 production rates in terrestrial rocks. Earth and Planetary Science Letters 105, (1991). 94 109.CrossRefGoogle Scholar
Zreda, M.G., Phillips, F.M., and Elmore, D. Cosmogenic 36Cl accumulation in unstable landforms, 2. Simulations and measurements on eroding moraines. Water Resources Research 30, (1994). 3127 3136.CrossRefGoogle Scholar
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