Deglacial laminated facies on the NW European continental margin: The hydrographic significance of British-Irish Ice Sheet deglaciation and Fleuve Manche paleoriver discharges

Research areas:
Year:
2007
Authors:
  • F. Eynaud
  • S. Zaragosi
  • J. D. Scourse
  • Meryem Mojtahid
  • J. F. Bourillet
  • I. R. Hall
  • A. Penaud
  • M. Locascio
  • A. Reijonen
Journal:
Geochemistry, Geophysics, Geosystems
Volume:
8
Number:
6
Pages:
Q06019
Month:
June
ISSN:
1525-2027
Abstract:
[1] We have compiled results obtained from four high
sedimentation rate hemipelagic sequences from the Celtic sector of
the NW European margin ( NE Atlantic) to investigate the
paleoceanographic and paleoclimatic evolution of the area over the
last few climatic cycles. We focus on periods characteristic of
deglacial transitions. We adopt a multiproxy sedimentological,
geochemical, and micropaleontological approach, applying a
sampling resolution down to ten microns for specific intervals.
The investigation demonstrates the relationships between the Bay
of Biscay hydrography and the glacial/deglacial history of both
the proximal British-Irish Ice Sheet (BIIS) and the western
European continent. We identify recurrent phases of laminae
deposition concurrent with major BIIS deglacial episodes in all
the studied cores. Evidence for abrupt freshwater discharges into
the open ocean highlights the influence of such events at a
regional scale. We discuss their impact at a global scale
considering the present and past key location of the Bay of Biscay
versus the Atlantic Meridional Overturning Circulation (AMOC).