Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Deep Pleistocene iceberg plowmarks on the Yermak Plateau; sidescan and 3.5 kHz evidence for thick calving ice fronts and a possible marine ice sheet in the Arctic Ocean

Peter R. Vogt, Kathleen Crane and Eirik Sundvor
Deep Pleistocene iceberg plowmarks on the Yermak Plateau; sidescan and 3.5 kHz evidence for thick calving ice fronts and a possible marine ice sheet in the Arctic Ocean
Geology (Boulder) (May 1994) 22 (5): 403-406

Abstract

The southern Yermak Plateau (northwest of Spitsbergen) was investigated with 11-12 kHz sidescan sonar and 3.5 kHz profiler to test whether thick Pleistocene ice streams ever calved into the Arctic Ocean and/or whether a continuous Arctic ice sheet existed. In either case, the ice would have grounded on the plateau crest on its way out of the Arctic. Several distinct sets of relict iceberg plowmarks were discovered at present water depths from less than 450 m to at least 850 m, perhaps recording the deepest iceberg keels known. The plateau crest (510-530 m) is nearly bare of plowmarks, perhaps because of beveling by an ice rise formed of grounding shelf ice. This implies continuous, 400-600-m-thick grounded ice, consistent with but not proving the postulated existence of an Arctic ice sheet. Most plowmarks are probably late Pleistocene products of the calving of Barents-Kara ice sheets into the Arctic Ocean. Plowmarks in 450-850-m-deep water require unusually deep ice-sheet grounding lines (e.g., Svyataya Anna Trough) and/or draft-increasing capsizing events, even if sea levels were 100-150 m lower than today. At water depths of 800 to 1800 m, the sidescan texture and topography suggest bottom currents descending the northeast slope of the plateau.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 22
Serial Issue: 5
Title: Deep Pleistocene iceberg plowmarks on the Yermak Plateau; sidescan and 3.5 kHz evidence for thick calving ice fronts and a possible marine ice sheet in the Arctic Ocean
Affiliation: Naval Research Laboratory, Marine Geosciences Division, Washington, DC, United States
Pages: 403-406
Published: 199405
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 15
Accession Number: 1994-026279
Categories: OceanographyQuaternary geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch maps
N79°49'60" - N81°00'00", E06°00'00" - E10°00'00"
Secondary Affiliation: University of Bergen, Bergen, NOR, Norway
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199412
Close Modal

or Create an Account

Close Modal
Close Modal