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GEOREF RECORD

Iceberg drop, dump, and grounding structures from Pleistocene glacio-lacustrine sediments, Scotland

Geoffrey S. P. Thomas and Rodger J. Connell
Iceberg drop, dump, and grounding structures from Pleistocene glacio-lacustrine sediments, Scotland
Journal of Sedimentary Petrology (March 1985) 55 (2): 243-249

Abstract

Dropstone, dump, and grounding structures, resulting from the melt-out of debris contained in floating and grounded icebergs, are described from a Pleistocene ice-marginal, glacio-lacustrine sequence in Scotland. Dropstones display bending penetration, rucking, and complete rupture of stratum occurring beneath them, and onlap above them, with the degree of deformation varying as a function of the size, shape, and axial disposition of the clast and of the sediment type into which they fell. Dump structures are conical mounds of gravel or diamict formed by the break-up and overturning of dirt-laden icebergs and the consequent release of large quantities of debris to the lake floor. Grounding structures are caused by the grounding of icebergs, the down-warping of underlying lake-floor sediment, and the subsequent in situ melt-out of contained debris to form isolated troughs of diamict.


ISSN: 0022-4472
Coden: JSEPAK
Serial Title: Journal of Sedimentary Petrology
Serial Volume: 55
Serial Issue: 2
Title: Iceberg drop, dump, and grounding structures from Pleistocene glacio-lacustrine sediments, Scotland
Affiliation: Univ. Liverpool, Dep. Geogr., Liverpool, United Kingdom
Pages: 243-249
Published: 198503
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 24
Accession Number: 1985-070964
Categories: Quaternary geologySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N54°40'00" - N61°00'00", W08°30'00" - W00°45'00"
Secondary Affiliation: Marathon Petrol., GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1985
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