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

PC Knutz, William Edward Newns Austin, EJW Jones

Research output: Contribution to journalArticlepeer-review

123 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)53-64
Number of pages12
JournalPaleoceanography
Volume16
Issue number1
DOIs
Publication statusPublished - Feb 2001

Keywords

  • LAST GLACIAL PERIOD
  • CONTINENTAL-SHELF WEST
  • HEINRICH EVENTS
  • DEEP-WATER
  • THERMOHALINE CIRCULATION
  • ICEBERG DISCHARGES
  • GREENLAND SNOW
  • NORWEGIAN-SEA
  • RAPID CHANGES
  • LABRADOR-SEA

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