Millennial-scale depositional cycles related to British Ice Sheet variability and North Atlantic paleocirculation since 45 kyr B.P., Barra Fan, U.K. margin

Lithology, lithic petrology, planktonic foraminiferal abundances, and elastic grain sizes have been determined in a 30 m-long core recovered from the Barra Fan off northwest Scotland. The record extends back to around 45 kyr B.P., with sedimentation rates ranging between 50 and 200 cm/kyr. The abund...

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Bibliographic Details
Published in:Paleoceanography
Main Authors: Knutz, PC, Austin, William Edward Newns, Jones, EJW
Format: Article in Journal/Newspaper
Language:English
Published: 2001
Subjects:
LAST GLACIAL PERIOD
CONTINENTAL-SHELF WEST
HEINRICH EVENTS
DEEP-WATER
THERMOHALINE CIRCULATION
ICEBERG DISCHARGES
GREENLAND SNOW
NORWEGIAN-SEA
RAPID CHANGES
LABRADOR-SEA
Barra
Greenland
Norwegian Sea
Rockall Trough
Ice Sheet
Labrador Sea
North Atlantic
Planktonic foraminifera
Online Access:https://risweb.st-andrews.ac.uk/portal/en/researchoutput/millennialscale-depositional-cycles-related-to-british-ice-sheet-variability-and-north-atlantic-paleocirculation-since-45-kyr-bp-barra-fan-uk-margin(ebb5d802-ff5f-4e48-af5f-d2a794ed761d).html
https://doi.org/10.1029/1999PA000483
http://www.scopus.com/inward/record.url?scp=0035062527&partnerID=8YFLogxK
Description
Summary:Lithology, lithic petrology, planktonic foraminiferal abundances, and elastic grain sizes have been determined in a 30 m-long core recovered from the Barra Fan off northwest Scotland. The record extends back to around 45 kyr B.P., with sedimentation rates ranging between 50 and 200 cm/kyr. The abundance of ice-rafted debris indicates 16 glacimarine events, including temporal equivalents to Heinrich events 1-4. Enhanced concentrations of basaltic material derived from the British Tertiary Province suggest that the glacimarine sediments record variations in a glacial source on the Hebrides shelf margin. Glacimarine zones are separated by silty intervals with high planktonic foraminifera concentrations that reflect an interstadial circulation regime in the Rockall Trough. The results suggest that the last British Ice Sheet fluctuated with a periodicity of 2000-3000 years, in common with the Dansgaard-Oeschger climate cycle.

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