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Tephrochronologic Constraints on the Late Pleistocene History of the Southern Margin of the Cordilleran Ice Sheet, Western Washington

Published online by Cambridge University Press:  20 January 2017

James E. Begét ,
Mary J. Keskinen  and
Kenneth P. Severin
James E. Begét
Affiliation:
Department of Geology and Geophysics, University of Alaska, Fairbanks, Alaska, 99775-5780
Mary J. Keskinen
Affiliation:
Department of Geology and Geophysics, University of Alaska, Fairbanks, Alaska, 99775-5780
Kenneth P. Severin
Affiliation:
Department of Geology and Geophysics, University of Alaska, Fairbanks, Alaska, 99775-5780
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Abstract

An ash layer that appears geochemically correlative with Mt. St. Helens tephra set S occurs in a sequence of Pleistocene lake sediments in the Ohop Valley of the southern Puget Lowland, below Vashon till deposited during the maximum late Pleistocene advance (Fraser Glaciation) of the Puget Lobe of the Cordilleran Ice Sheet. The Puget Lobe reached its maximum southern extent ca. 14,000–14,500 yr B.P., and at least part of set S is evidently somewhat older. Previous radiocarbon and thermoluminescence dates for set S have ranged from 13,000 to 16,000 yr B.P.

Geochemically correlative deposits of set S tephra occur in slackwater sediments coeval with the Missoula Floods in eastern Washington, produced by jökulhlaups through the Purcell Trench Lobe of the Cordilleran Ice Sheet. These relationships suggest that advances of glacier lobes on the southern margin of the Cordilleran Ice Sheet were nonsynchronous, as the Pucell Trench lobe east of the Cascade Range advanced to its maximum southern extent prior to the time of the eruption of set S, before the Puget Lobe west of the Cascades reached its maximum southern extent.

Type
Original Articles
Information
Quaternary Research , Volume 47 , Issue 2 , March 1997 , pp. 140 - 146
Copyright
University of Washington

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References

Atwater, B.F., 1987. Status of Glacial Lake Columbia during the last floods from Glacial Lake Missoula. Quaternary Research 27, 182–201.Google Scholar
Begét, J., Reger, R., Pinney, D., Gillespie, T., Campbell, K., 1991. Correlation of the Holocene Jarvis Creek, Tangle Lakes, Cantwell, and Hayes tephras in south-central and central Alaska. Quaternary Research 35, 174–189.Google Scholar
Berger, G.W., Busacca, A.J., 1995. Thermoluminescence dating of late Pleistocene loess and tephra from eastern Washington and southern Oregon and implications for the eruptive history of Mount St. Helens. Journal of Geophysical Research 100, 22361–22374.CrossRefGoogle Scholar
Booth, D.B., 1987. Timing and processes of deglaciation along the southern margin of the Cordilleran ice sheet. North America and Adjacent Oceans during the Last Deglaciation Geological Society of America, Boulder, p. 71–90.Google Scholar
Bretz, J. H., 1913. Glaciation of the Puget Sound Region. 8,.Google Scholar
Busacca, A.J., Nelstead, K.T., McDonald, E.V., Purser, M.D., 1992. Correlation of distal tephra layers in loess in the Channeled Scabland and Palouse of Washington State. Quaternary Research 37, 281–303.Google Scholar
Davis, P. T., Barnosky, C. W., Stuiver, M., 1982. A 20,000 Yr Record of Volcanic Ashfalls. Davis Lake, Southeastern Washington, 87.Google Scholar
Easterbrook, D.J., 1992. Advance and retreat of Cordilleran ice sheets in Washington, U.S.A. Geographie physique et Quaternaire 46, 51–68.Google Scholar
Easterbrook, D.J., Briggs, N.D., Westgate, J.A., Gorton, M.P., 1981. Age of the Salmon Springs Glaciation in Washington. Geology 9, 87–93.Google Scholar
Easterbrook, D.J., Roland, J.L., Carson, R.J., Naeser, N.D., 1988. Application of paleomagnetism, fission-track dating, and tephra correlation to lower Pleistocene sediments in the Puget Lowland, Washington. Easterbrook, D.J., Dating Quaternary Sediments Geological Society of America Special Paper, Denver, 139–165.Google Scholar
Mullineaux, D.R., 1986. Summary of pre-1980 tephra-fall deposits from Mt. St. Helens, Washington State, U.S.A. Bulletin Volcanology 48, 17–26.Google Scholar
Mullineaux, D. R., 1996. Pre-1980 Tephra-fall deposits erupted from Mount St. Helens, Washington, 1563.Google Scholar
Mullineaux, D.R., Hyde, J.H., Rubin, M., 1975. Widespread late glacial and postglacial tephra deposits from Mount St. Helens volcano, Washington. U. S. Geological Survey Journal of Research 3, 326–335.Google Scholar
Mullineaux, D.R., Wilcox, R.E., Ebaugh, W.F., Fryxell, R., Rubin, M., 1978. Age of the last major scabland flood of the Columbia Plateau of eastern Washington. Quaternary Research 10, 171–180.Google Scholar
Porter, S.C., Pierce, K.L., Hamilton, T.D., 1983. Late Wisconsin mountain glaciation in the western United States. Porter, S.C., Late Quaternary Environments of the United States, Vol. 1, The Late Pleistocene University of Minnesota Press, Minneapolis, 71–111.Google Scholar
Sarna-Wojicki, A.M., Davis, J.O., 1991. Quaternary tephrochronology. Morrison, R.B., The Geology of North America: Quaternary Nonglacial Geology; Conterminous United States, Vol. K-2 Geological Society of America, Denver, 93–116.Google Scholar
Thorson, R.M., 1980. Ice sheet glaciation of the Puget Lowland, Washington, during the Vashon Stade. Quaternary Research 13, 303–321.CrossRefGoogle Scholar
Waitt, R.B. Jr., Thorson, R.M., 1983. The Cordilleran ice sheet in Washington, Idaho, and Montana. Porter, S.C., Wright, H.E., Late-Quaternary Environments of the United States University of Minnesota Press, Minneapolis, 53–70.Google Scholar
Westgate, J.A., Easterbrook, D.J., Naeser, N.D., Carson, R.J., 1987. Lake Tappas Tephra: An early Pleistocene stratigraphic marker in the Puget Lowland, Washington. Quaternary Research 28, 340–355.Google Scholar