Lake Pavin Paleolimnology and Event Stratigraphy

Léo Chassiot (1) , Emmanuel Chapron (2) , Yannick Miras (3) , Markus J. Schwab (4) , Patrick Albéric (1) , Aude A Beauger (3) , Anne-Lise Develle (5) , Fabien Arnaud (5) , P P Lajeunesse (6) , Renata Zocatelli (1) , Sylvain Bernard (7) , Anne-Catherine Lehours (8) , D J Jézéquel (9)

1 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
2 GEODE - Géographie de l'environnement
3 GEOLAB - Laboratoire de Géographie Physique et Environnementale
4 GFZ - German Research Centre for Geosciences - Helmholtz-Centre Potsdam
5 EDYTEM - Environnements, Dynamiques et Territoires de Montagne
6 CEN - Centre d'Etudes Nordiques
7 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie
8 LMGE - Laboratoire Microorganismes : Génome et Environnement
9 IPGP - Institut de Physique du Globe de Paris

In this chapter we present an up-to-date database of sedimentary sequences retrieved from Lake Pavin during the last 50 years in both oxic and anoxic waters. The detailed history of this mid Holocene crater lake can be reconstructed from the correlation of radiocarbon dated sedimentary sequences retrieved from the deep central basin, a subaquatic plateau and littoral environments. High-resolution measurements of sediment composition (diffuse spectral refl ectance, XRF core scanning) combined with the analysis of organic matter composition and preliminary pollen and diatom assemblages investigations on selected sediment cores are used to reconstruct (i) the evolution since ca. 7000 cal BP of Lake Pavin limnology together with its radiocarbon reservoir effect and (ii) the impact of a wide range of subaquatic slope failure events. Such a multidisciplinary approach of Lake Pavin basin fi ll revealed contrasted sedimentation patterns just after the volcanic eruption and following the development of a dense vegetation cover along the slopes of the crater. Pavin sedimenta-tion is rapidly and largely dominated by organic rich and fi nely laminated diatomite formation , but several short periods of enhanced mineral inputs might refl ect the infl uence of wetter periods, such as the Little Ice Age. Over the last millennium two large subaquatic mass wasting events are also identifi ed and may have signifi cantly impacted its limnology.

Mots clés: Lake Pavin; paleolimnology; sedimentary sequences database

Domaines: Planète et Univers [physics]

Léo Chassiot, Emmanuel Chapron, Yannick Miras, Markus J. Schwab, Patrick Albéric, et al.. Lake Pavin Paleolimnology and Event Stratigraphy. Lake Pavin, history, geology, biogeochemistry and sedimentology of a deep meromictic maar lake, Springer, pp.381 - 406, 2016, ⟨10.1007/978-3-319-39961-4_23⟩. ⟨hal-01447131⟩