Multidisciplinary characterisation of sedimentary processes in a recent maar lake (Lake Pavin, French Massif Central) and implication for natural hazards
Emmanuel Chapron,Patrick Albéric,Didier Jézéquel,Willem Versteeg,Jean-Louis Bourdier,J. Sitbon +5 more
TLDR
In this paper, the most recent maar lake of the French Massif Central (Lake Pavin) is documented for the first time based on high resolution seismic reflection and multibeam bathymetric surveys and by piston coring and radiocarbon dating on a sediment depocentre developed on a narrow sub aquatic plateau.Abstract:
. Sedimentation processes occurring in the most recent maar lake of the French Massif Central (Lake Pavin) are documented for the first time based on high resolution seismic reflection and multibeam bathymetric surveys and by piston coring and radiocarbon dating on a sediment depocentre developed on a narrow sub aquatic plateau. This new data set confirms the mid Holocene age of maar lake Pavin formation at 6970±60 yrs cal BP and highlights a wide range of gravity reworking phenomena affecting the basin. In particular, a slump deposit dated between AD 580–640 remoulded both mid-Holocene lacustrine sediments, terrestrial plant debris and some volcanic material from the northern crater inner walls. Between AD 1200 and AD 1300, a large slide scar mapped at 50 m depth also affected the southern edge of the sub aquatic plateau, suggesting that these gas-rich biogenic sediments (laminated diatomite) are poorly stable. Although several triggering mechanisms can be proposed for these prehistoric sub-aquatic mass wasting deposits in Lake Pavin, we argue that such large remobilisation of gas-rich sediments may affect the gas stability in deep waters of meromictic maar lakes. This study highlights the need to further document mass wasting processes in maar lakes and their impacts on the generation of waves, favouring the development of dangerous (and potentially deadly) limnic eruptions.read more
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Classification of offshore mass movements
Thierry Mulder,Pierre Cochonat +1 more
TL;DR: More than 100 offshore mass-movement deposits have been studied in Holocene and Pleistocene sediments, and the processes can be divided into three main types: slides/slumps, plastic flows, and turbidity currents, of which 13 main varieties have been recognized as mentioned in this paper.
Journal ArticleDOI
Iron isotopes in an Archean ocean analogue
Vincent Busigny,Noah J. Planavsky,Noah J. Planavsky,Didier Jézéquel,Sean A. Crowe,Pascale Louvat,Julien Moureau,Eric Viollier,Timothy W. Lyons +8 more
TL;DR: In this paper, a detailed study of anoxic and ferruginous Lac Pavin (France) sedimentary cores was conducted, and it was shown that most of the Fe isotope variability observed in sedimentary pyrites can be tied to water column cycling and the oxidation of dissolved ferrous iron.
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Constraints on the timing of Quaternary volcanism and duration of magma residence at Ciomadul volcano, east–central Europe, from combined U–Th/He and U–Th zircon geochronology
Szabolcs Harangi,Réka Lukács,Réka Lukács,Axel K. Schmitt,István Dunkl,Kata Molnár,Balázs Kiss,Balázs Kiss,Ioan Seghedi,Ágnes Novothny,Mihály Molnár +10 more
TL;DR: In this paper, high-spatial resolution zircon geochronology was applied to constrain the timescales of the youngest, mostly explosive volcanic phase of Ciomadul volcano (Carpathian-Pannonian region, Romania).
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Geodetic Evidence for a Buoyant Mantle Plume Beneath the Eifel Volcanic Area, NW Europe
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6700 yr sedimentary record of climatic and anthropogenic signals in Lake Aydat (French Massif Central)
Marlène Lavrieux,Marlène Lavrieux,Jean-Robert Disnar,Emmanuel Chapron,Jean-Gabriel Bréhéret,Jérémy Jacob,Yannick Miras,Jean Louis Reyss,Valérie Andrieu-Ponel,Fabien Arnaud +9 more
TL;DR: In this article, a 19meters-long sedimentary record was retrieved in Lake Aydat (French Massif Central) covering the last 6700 yrs at a high-resolution.
References
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Submarine landslides: processes, triggers and hazard prediction
TL;DR: Monitoring of critical areas where landslides might be imminent and modelling landslide consequences so that appropriate mitigation strategies can be developed would appear to be areas where advances on current practice are possible.
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Journal Article
Classification of offshore mass movements
Thierry Mulder,Pierre Cochonat +1 more
TL;DR: More than 100 offshore mass-movement deposits have been studied in Holocene and Pleistocene sediments, and the processes can be divided into three main types: slides/slumps, plastic flows, and turbidity currents, of which 13 main varieties have been recognized as mentioned in this paper.
Journal ArticleDOI
Classification of Offshore Mass Movements
Thierry Mulder,Pierre Cochonat +1 more
TL;DR: More than 100 offshore mass-movement deposits have been studied in Holocene and Pleistocene sediments, and the processes can be divided into three main types: slides/slumps, plastic flows, and turbidity currents, of which 13 main varieties have been recognized.
Journal ArticleDOI
Climate variations in Europe over the past 140 kyr deduced from rock magnetism
Nicolas Thouveny,Jacques-Louis de Beaulieu,Eugène Bonifay,K.M. Creer,Joel Guiot,Michel Icole,Sigfus J Johnsen,Sigfus J Johnsen,Jean Jouzel,Maurice Reille,Trevor Williams,David Williamson +11 more
TL;DR: In this paper, the authors present magnetic susceptibility, pollen and organic carbon records from maar lake deposits in the Massif Central, France and find that they correlate well with the ice-core records during the last glacial.