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GEOREF RECORD

Bryozoan-rich layers in surficial Labrador Slope sediments, eastern Canadian Arctic

F. C. Thomas, I. A. Hardy and H. Rashid
Bryozoan-rich layers in surficial Labrador Slope sediments, eastern Canadian Arctic
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (March 2003) 40 (3): 337-350

Abstract

Layers rich in remains of a shallow-water bryozoan species, Idmidronea atlantica, have been found in Quaternary sediments in a piston core taken from 1085 m water depth in the Labrador Sea (59.700270 degrees N, 60.238370 degrees W), tens of kilometres from the nearest possible source. These layers occur anomalously in pelagic-hemipelagic muds with abundant planktic and deep-water benthic foraminifera, and are thus not in sediments attributable to mud turbidite or debris flows. The bryozoan remains appear to be most common in intervals just below Heinrich events H1 and H2 ( approximately 14 500 and approximately 20 600 (super 14) C years BP, respectively). Two possible ice-related transport mechanisms are suggested to have been involved in the deposition of the bryozoan fragments. The first method involved the scouring action of loose pack ice and (or) bergs dislodging and mobilizing attached bryozoans in shallow water, where they could be subsequently entrained in currents and transported to deeper water. The second method may have occurred when attached colonies of these animals were frozen in place as winter ice formed in shallow water, to be carried out to deeper conditions while still encased in loose floes the subsequent spring-summer.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 40
Serial Issue: 3
Title: Bryozoan-rich layers in surficial Labrador Slope sediments, eastern Canadian Arctic
Affiliation: Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, Dartmouth, NS, Canada
Pages: 337-350
Published: 200303
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 37
Accession Number: 2003-046338
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 plate, 4 tables, sketch map
N59°42'00" - N59°42'00", W60°13'60" - W60°13'60"
Secondary Affiliation: Massachusetts Institute of Technology, USA, United States
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200315
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