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Slow, patchy landscape evolution in northern Sweden despite repeated ice-sheet glaciation

A. P. Stroeven, J. Harbor, D. Fabel, J. Klemen, C. Hattestrand, D. Elmore, D. Fink and O. Fredin
Slow, patchy landscape evolution in northern Sweden despite repeated ice-sheet glaciation (in Tectonics, climate, and landscape evolution, Sean D. Willett (editor), Niels Hovius (editor), Mark T. Brandon (editor) and Donald M. Fisher (editor))
Special Paper - Geological Society of America (2006) 398: 387-396

Abstract

The conventional assumption that erosion by ice sheets is pervasive and effective in landscape evolution is tested in northern Sweden using geomorphic mapping and cosmogenic nuclide analyses of formerly glaciated surfaces. The following evidence indicates that recent glaciations in this region have produced only slow and patchy landscape evolution: (1) Geomorphic mapping shows that at least 20% of the repeatedly glaciated study region in the northern Swedish mountains has landforms that are relict, i.e., clearly nonglacial in origin. (2) The contrast between cosmogenic apparent exposure ages from relict landforms in the northern Swedish mountains and from overlying glacial erratics and juxtaposed glacially eroded bedrock surfaces, which are consistent with last deglaciation, implies that the relict landforms have been preserved through multiple glacial cycles. (3) Apparent (super 10) Be and (super 26) Al exposure ages for tor summit bedrock surfaces in the northern Swedish lowlands reveal that these relict landforms have survived at least eleven exposure and ten burial events with little or no erosion over the past approximately 1 m.y. (4) The northern Swedish lowland and mountains are primarily covered by glacial landforms. However geomorphic mapping suggests that even these landforms may have undergone limited erosion during the last glacial cycle. Cosmogenic (super 10) Be and (super 36) Cl data from what appear to be heavily scoured areas in one glacial corridor indicate erosion of only approximately 2+ or -0.4 m of bedrock during the last glaciation. These results suggest that in some areas the overall modification produced by ice sheets may be more restricted than previously thought, or it has occurred preferentially during earlier Quaternary glacial periods.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 398
Title: Slow, patchy landscape evolution in northern Sweden despite repeated ice-sheet glaciation
Title: Tectonics, climate, and landscape evolution
Author(s): Stroeven, A. P.Harbor, J.Fabel, D.Klemen, J.Hattestrand, C.Elmore, D.Fink, D.Fredin, O.
Author(s): Willett, Sean D.editor
Author(s): Hovius, Nielseditor
Author(s): Brandon, Mark T.editor
Author(s): Fisher, Donald M.editor
Affiliation: Stockholm University, Department of Physical Geography and Quaternary Geology, Stockholm, Sweden
Affiliation: University of Washington, Department of Earth and Space Sciences, Seattle, WA, United States
Pages: 387-396
Published: 2006
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Meeting name: Penrose conference on Tectonics, climate, and landscape evolution
Meeting location: Taroko Gorge, TWN, Taiwan
Meeting date: 20032003
References: 75
Accession Number: 2006-061397
Categories: Quaternary geologyGeochronology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N67°00'00" - N69°00'00", E19°00'00" - E23°00'00"
Secondary Affiliation: University of Cambridge, GBR, United KingdomYale University, USA, United StatesPennsylvania State University, USA, United StatesPurdue University, USA, United StatesGlasgow University, GBR, United KingdomAustralian Nuclear Science and Technology Organisation, AUS, AustraliaGeological Survey of Norway/University of Bergen, NOR, Norway
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200635
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