Sea-floor morphology outside a grounded, surging glacier; Bråsvellbreen, Svalbard

Anders Solheim, Stephanie Louise Pfirman

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

Acoustical profiling and bottom photography reveal several different sea-floor morphological features adjacent to the grounded Bråsvellbreen glacier on Svalbard, northwestern Barents Sea. Some of the features and their distribution may be closely related to a major glacial surge in 1936-1938, and as such are valuable in identifying former surges in other locations. A continuous, wide ridge with a characteristic asymmetrical cross-section, running subparallel to the glacier, is the end moraine defining the maximum extent of the surge. A large part of the material forming this ridge is most likely rapidly deposited from meltwater during the surge. A rhombohedral pattern of smaller mounds inside the ridge is probably an expression of relief in the glacier sole during the surge. Discontinuous arcuate ridges define local, minor oscillations during retreat of the ice at a later stage. Iceberg plough marks are most frequent seaward of the end moraine, their orientation is controlled by the combination of a coastal current, offshore katabatic winds and topography. Superimposed on plough marks are secondary features such as a "washboard pattern" and striae, most likely caused by push-up of overconsolidated material during gouging and multi-keel icebergs, respectively. Bottom sediments, observed in photographs and cores, are loose, pebbly muds with high variability in clast content, resting on overconsolidated material, probably basal till. Mud deposition presently prevails close to the glacier.

Original languageEnglish (US)
Pages (from-to)127-143
Number of pages17
JournalMarine Geology
Volume65
Issue number1-2
DOIs
StatePublished - May 1985
Externally publishedYes

Fingerprint

Glaciers
glacier
seafloor
iceberg
moraine
mud
coastal current
Ice
Photography
photography
meltwater
clast
Topography
photograph
Sediments
relief
cross section
oscillation
topography
ice

ASJC Scopus subject areas

  • Oceanography
  • Geology
  • Geochemistry and Petrology

Cite this

Sea-floor morphology outside a grounded, surging glacier; Bråsvellbreen, Svalbard. / Solheim, Anders; Louise Pfirman, Stephanie.

In: Marine Geology, Vol. 65, No. 1-2, 05.1985, p. 127-143.

Research output: Contribution to journalArticle

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