EGU22-1003
https://doi.org/10.5194/egusphere-egu22-1003
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Palynological and sedimentological records since 8.5 ka BP on the southern Brittany platform (NW Europe): complex responses to sea-level, rapid climate and anthropogenic changes

Ophélie David1,2, Aurélie Penaud1, Muriel Vidal1, Wiem Fersi1, Clément Lambert2, Evelyne Goubert2, Maïwenn Herledan3, Pierre Stéphan4, Yvan Pailler5, Jean-François Bourillet6, and Agnes Baltzer7
Ophélie David et al.
  • 1Laboratoire Géo-Océan, Université de Bretagne Occidentale, IUEM, Plouzané, France
  • 2Laboratoire Géo-Océan, Université de Bretagne Sud, Vannes, France
  • 3Laboratoire d'Océanologie et de Géosciences, Université de Lille, Villeneuve d’Ascq, France
  • 4Littoral Environnement Télédéctection Géomatique, IUEM, Plouzané, France
  • 5Chaire Armerie, Inrap, Littoral Environnement Télédéctection Géomatique, Université de Bretagne Occidentale, IUEM, Plouzané, France
  • 6Laboratoire Géo-Océan, Ifremer, Plouzané, France
  • 7Littoral Environnement Télédéctection Géomatique, Université de Nantes, Nantes, France

New results acquired in the south-Brittany shelf (core MD08-3204 CQ: Bay of Quiberon and core VK03-58bis: south-Glénan) allow depicting Holocene paleoenvironmental changes from 8.5 ka BP to present through a multi-proxy dataset including sedimentological and palynological data.

First, grain-size analyses and AMS-14C dates depict a common sedimentary history for both study cores. After the post-glacial sea-level (RSL) rise and related high sedimentation rates, the parallel slowdown of the RSL rise and the drop of sedimentation rates occurred between 8.3 and 5.7 ka BP. This interval leads to the establishment of a shell-condensed level, identified in the VK03-58bis core by the “Turritella layer” and interpreted as a marker for the establishment of the maximum flooding surface. Palynological data (pollen grains and dinocyst assemblages) acquired in the core MD08-3204 CQ argue for an amplification of the fluvial influence since 5.9 ka BP; the establishment of the highstand system tract (i.e. estuarine-type sedimentation on the platform) then accompanying the slowdown of the RSL rise. On the shelf, the Anthropogenic Pollen Indicators (API) amplification, is detected since 4.2 ka BP, due to the fluvial influence becoming predominant in the context of the Late Holocene.

In addition, the comparison of fluvial palynological tracers, including API, over the last 7 kyrs, with coastal-marines sites subjected to northern vs. southern Loire catchment areas, allowed to discuss a major hydro-climatic effect on the reconstructed palynological signals. Strengthened subpolar gyre dynamics (SPG), combined with recurrent positive North Atlantic Oscillation (NAO) configurations, are well-known to favour increased winter precipitation and fluvial discharge in northern Europe, such as Brittany, and conversely during weakened SPG the winter fluvial discharge is intensified over southern Europe. Interestingly, we record, at an infra-orbital timescale, major peaks of API during periods of strengthened (/weakened) SPG dynamics in sites whose catchment areas are located north (/south) of the Loire.

How to cite: David, O., Penaud, A., Vidal, M., Fersi, W., Lambert, C., Goubert, E., Herledan, M., Stéphan, P., Pailler, Y., Bourillet, J.-F., and Baltzer, A.: Palynological and sedimentological records since 8.5 ka BP on the southern Brittany platform (NW Europe): complex responses to sea-level, rapid climate and anthropogenic changes, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-1003, https://doi.org/10.5194/egusphere-egu22-1003, 2022.

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