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Sedimentation and Stratigraphy at Eyjabakkajökull—An Icelandic Surging Glacier

Published online by Cambridge University Press:  20 January 2017

Martin Sharp
Martin Sharp*
Affiliation:
Department of Geography, University of Cambridge, Downing Place, Cambridge, CB2 3EN, United Kingdom
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Abstract

A model for sedimentation by surging glaciers is developed from analysis of the debris load, sedimentary processes, and proglacial stratigraphy observed at the Icelandic surging glacier, Eyjabakkajökull. Three aspects of the behavior of surging glaciers explain the distinctive landformsediment associations which they may produce: (a) sudden loading of proglacial sediments during rapid glacier advances results in the buildup of excess pore pressures, failure, and glacitectonic deformation of the overridden sediments; (b) reactivation of stagnant marginal ice by the downglacier propagation of surges is associated with large longitudinal compressive stresses. These induce intense folding and thrusting during which basal debris-rich ice is elevated into an englacial position in a narrow marginal zone. As the terminal area of the glacier stagnates between surges, debris from this ice is released supraglacially and deposited by meltout and sediment flows; (c) local variations in overburden pressure beneath stagnant, crevassed ice cause subglacial lodgement tills, which are sheared during surges, to flow into open crevasses and form “crevasse-fill” ridges.

Type
Research Article
Information
Quaternary Research , Volume 24 , Issue 3 , November 1985 , pp. 268 - 284
Copyright
University of Washington

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References

Boulton, G.S. (1972). The role of thermal regime in glacial sedimentation Price, R.J. Sugden, D.E. Polar Geomorphology. Institute of British Geographers Special Publication No. 4.1–19 Google Scholar
Boulton, G.S. (1976). The origin of glacially fluted surfaces—Observations and theory Journal of Glaciology 17, 287–310 CrossRefGoogle Scholar
Boulton, G.S. (1978). Boulder shapes and grain size distributions as indicators of transport paths through a glacier and till genesis Sedimentology 25, 773–799 CrossRefGoogle Scholar
Boulton, G.S. Dent, D.L. (1974). The nature and rates of post-depositional changes in recently deposited till from south east Iceland Geografiska Annaler 56A 121–134 CrossRefGoogle Scholar
Boulton, G.S. Jones, A.S. (1979). Stability of temperate ice caps and ice sheets resting on beds of deformable sediment Journal of Glaciology 24, 29–44 CrossRefGoogle Scholar
Clapperton, C.M. (1975). The debris content of surging glaciers in Svalbard and Iceland Journal of Glaciology 14, 395–406 CrossRefGoogle Scholar
Clarke, G.K.C. Collins, S.G. Thompson, D.E. (1984). Flow, thermal structure and subglacial conditions of a surge-type glacier Canadian Journal of Earth Sciences 21, 232–240 CrossRefGoogle Scholar
Clayton, L. Moran, S.R. (1974). A glacial process-form model Coates, D.R. Glacial Geomorphology State University of New York Binghamton, N.Y 89–119 Google Scholar
Croot, D.G. (1978). The Depositional Landforms and Sediments Produced by Two Surging Glaciers Unpublished Ph.D thesis University of Aberdeen Scotland Google Scholar
Croot, D.G. Garton, M. (1982). Morphological, structural, and mechanical analysis of neoglacial push ridges in Iceland Abstracts XI INQUA Congress Moscow. 1982 45 Google Scholar
Eyles, N. Eyles, C.H. Miall, A.D. (1983). Lithofacies types and vertical profile models: An alternative approach to the description and environmental interpretation of glacial diamict and diamictite sequences Sedimentology 30, 393–410 CrossRefGoogle Scholar
Eyles, N. Slatt, R.M. (1977). Ice-marginal sedimentary, glacitectonic and morphologic features of Pleistocene drift: An example from Newfoundland Quaternary Research 8, 267–281 CrossRefGoogle Scholar
Folk, R.L. Ward, W.C. (1957). Brazos River Bar: A study in the significance of grain size parameters Journal of Sedimentary Petrology 27, 3–26 CrossRefGoogle Scholar
Goldthwait, R.P. (1951). Development of end moraines in east-central Baffin Island Journal of Geology 59, 567–577 CrossRefGoogle Scholar
Hambrey, M.J. Milnes, A.G. (1977). Structural geology of an Alpine glacier (Griesgletscher, Valais, Switzerland) Eclogae Geologicae Helvetiae 70, 667–684 Google Scholar
Hooke, R.leB. (1968). Comments on “The Formation of Shear Moraines: An Example from South Victoria Land, Antarctica” Journal of Glaciology 7, 351–352 CrossRefGoogle Scholar
de Jong, M.G.G. Rappol, M. (1983). Ice-marginal debris flow deposits in western Allgäu, southern West Germany Boreas 12, 57–70 CrossRefGoogle Scholar
Krüger, J. (1979). Structures and textures in till indicating subglacial deposition Boreas 8, 323–340 CrossRefGoogle Scholar
Lawson, D.E. (1979). Sedimentological Analysis of the Western Terminus Region of the Matanuska Glacier, Alaska U.S. Army, Cold Regions Research and Engineering Laboratory Report 79 Google Scholar
Lawson, D.E. (1981). Distingushing characteristics of diamictons at the margin of Matanuska Glacier, Alaska Annals of Glaciology 2, 78–84 CrossRefGoogle Scholar
Matthews, W.H. Mackay, J.R. (1960). Deformation of soils by glacier ice and the influence of pore pressures and permafrost Transactions of the Royal Society of Canada 54, 27–36 Series 3Google Scholar
Meier, M.F. Post, A.S. (1969). What are glacier surges? Canadian Journal of Earth Sciences 6, 807–819 CrossRefGoogle Scholar
Moran, S.R. Clayton, L. Hooke, R.le B. Fenton, M.M. Andriashek, L.D. (1980). Glacier bed landforms of the Prairies Region of North America Journal of Glaciology 25, 457–476 CrossRefGoogle Scholar
Powers, M. (1953). A new roundness scale for sedimentary particles Journal of Sedimentary Petrology 25, 117–119 Google Scholar
Sharp, M. (1982a). Modification of clasts in lodgement tills by glacial erosion Journal of Glaciology 28, 475–481 CrossRefGoogle Scholar
Sharp, M. (1982b). A Comparison of the Landforms and Sedimentary Sequences Produced by Surging and Non-Surging Glaciers in Iceland Unpublished Ph.D thesis University of Aberdeen Scotland Google Scholar
Sharp, M. (1984). Annual moraine ridges at Skalafellsjökull, south east Iceland Journal of Glaciology 30, 82–93 CrossRefGoogle Scholar
Sharp, M. (in press). Crevasse-fill ridges—A landform type characteristic of surging glaciers? Geografiska Annaler .Google Scholar
Slatt, R.M. (1971). Texture of ice-cored deposits from ten Alaskan valley glaciers Journal of Sedimentary Petrology 41, 828–834 Google Scholar
Teller, J.T. Clayton, L. (1982). Late-Glacial Surging of the Des Moines and Red River Lobes Abstracts of papers, 11th International Congress on Sedimentology McMaster University, Hamilton, Ontario, Canada, August 22–27, 1982 78 Google Scholar
Thorarinsson, S. (1943). Oscillations of the Icelandic glaciers in the last 250 years Geografiska Annaler 25, 1–54 Google Scholar
Todtman, E.M. (1953). Am Rand des Eyjabakkagletschers, Sommer 1953 Jökull 3, 34–36 ArCrossRefGoogle Scholar
Todtmann, E.M. (1960). Gletscherforschungen auf 1sland (Vatnajökull) University of Hamburg Abhandlungen aus dem Gebiet der Auslandskunde 65, 19 Reihe C.Google Scholar
Weertman, J. (1961). Mechanism for the formation of inner moraines formed near the edge of cold ice caps and ice sheets Journal of Glaciology 3, 965–978 CrossRefGoogle Scholar
Weertman, J. (1969). Water lubrication mechanism of glacier surges Canadian Journal of Earth Sciences 6, 929–942 CrossRefGoogle Scholar
Williams, R.S. Jr. (1976). Vatnajökull Ice Cap, Iceland United States Geological Survey Professional Paper 929, 188–193 Google Scholar
Wright, H.E. Jr. (1973). Tunnel valleys, glacial surges and subglacial hydrology of the Superior lobe, Minnesota Geological Society of America Memoir 136, 251–276 CrossRefGoogle Scholar
Zing, Th. (1935). Beitrag zur Schotteranalyse Schweizerische Mineralogische und Petrologische Mitteilungen 15, 38–140 Google Scholar