# Establishing the first continuous Holocene tephrostratigraphy on Kerguelen Archipelago, subantarctic Indian Ocean

Fabien Arnaud, Pierre Sabatier, Anouk Leloup, Aymerick Servettaz, Bertrand

N. Moine, Anne-Lise Develle, Stéphane Guédron, Vincent Perrot, Jérôme

Poulenard, Bernard Fanget, et al.

► To cite this version:

Fabien Arnaud, Pierre Sabatier, Anouk Leloup, Aymerick Servettaz, Bertrand N. Moine, et al. Establishing the first continuous Holocene tephrostratigraphy on Kerguelen Archipelago, subantarctic Indian Ocean. EGU General Assembly 2020, May 2020, Online, France. 10.5194/egusphere-egu2020-5782. [https://doi.org/10.5194/egusphere-egu2020-5782](https://doi.org/10.5194/egusphere-egu2020-5782).

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# Establishing the first continuous Holocene tephrostratigraphy on Kerguelen Archipelago, subantarctic Indian Ocean

## Conference Paper · April 2020

DOI: 10.5194/egusphere-egu2020-5782

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Fabien Arnaud

Université Savoie Mont Blanc

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Bertrand N. Moine

Université Clermont Auvergne

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Pierre Sabatier

Université Savoie Mont Blanc

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Anne-Lise Develle

Université Savoie Mont Blanc

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# Establishing the first continuous Holocene tephrostratigraphy on Kerguelen Archipelago, subantarctic Indian Ocean<fnref n="1" />

Fabien Arnaud<fnref n="1" />, Pierre Sabatier<fnref n="1" />, Anouk Leloup<fnref n="1" />, Aymerick Servettaz<fnref n="1" />,<fnref n="2" />, Bertrand Moine<fnref n="3" />, Anne-Lise Develle<fnref n="1" />, Stéphane Guédron<fnref n="4" />, Vincent Perrot<fnref n="4" />, Jérôme Poulenard<fnref n="1" />, Bernard Fanget<fnref n="1" />, Emmanuel Malet<fnref n="1" />, Eivind Støren<fnref n="5" />, Jean-Louis Reyss<fnref n="1" />, Nicolas Le Viavan<fnref n="6" />, Katrien Heirman<fnref n="7" />, Marc De Batist<fnref n="7" />, Elisabeth Michel<fnref n="2" />, Jacques-Louis de Beaulieu<fnref n="8" />, Nathalie Vanderputten<fnref n="2" />, and Jostein Bakke<fnref n="5" />

Here we present the first Holocene-long continuous chronology of volcanic eruptions on Kerguelen archipelago, where no evidence of Holocene volcanic activity has been published so far. Our chronicle is based upon sedimentological, chronological and geochemical data from two sediment cores, taken in two different depocenters of a large lake, Lake Armor, located ca. 70 km away from the archipelago's potentially active volcanic area. This allowed us to confidently attribute the origin of pumice-rich or ash-rich layers to contemporaneous volcanic eruptions. Altogether eight main eruptions, as well as three secondary ones, were here documented and dated, among which the youngest occurred during the Middle Age, between 890 and 980 AD. The oldest eruption is also by far the strongest one and deposited more than 1.2m of up-to 3cm large pumices, 70 km away from the volcanic edifice. It occurred at the very beginning of the Holocene (11 ka cal. BP), suggesting a climatic control after glacial retreat upon volcanic activity. Additional evidences from lake sediment and geological outcrops, both close to Lake Armor and in remote areas over Kerguelen mainland, open the future possibility of a better reconstruction of major eruptions deposit spreading and thus an assessment of their intensity. This established chronostratigraphy will be useful to synchronise paleoenvironment record at least at the scale of the archipelago as well as in surrounding marine areas where Holocene climate reconstructions are particularly sparse.

<footnote n="1">¹Environment Dynamics and Territories of the Mountains (EDYTEM), Université Savoie Mont-Blanc, CNRS, 73000 Chambéry, France</footnote>

<footnote n="2">²Laboratoire des Sciences du Climat et de l'Environnement (LSCE), CEA, CNRS, 91 Gif-sur-Yvette, France</footnote>

<footnote n="3">³Laboratoire Magmas et Volcans, Université Jean Monnet, CNRS, 42023 Saint-Etienne France</footnote>

<footnote n="4">⁴Institut des Sciences de la Terre (ISTerre), Université Grenoble Alpes, CNRS, Grenoble, France</footnote>

<footnote n="5">⁵Department of Earth Science and Bjerknes Centre for Climate Research, University of Bergen, Allégaten 41, 5007 Bergen, Norway</footnote>

<footnote n="6">⁶Institut Paul-Emile Victor (IPEV), 29280, Plouzané, France</footnote>

<footnote n="7">⁷Renard Centre of Marine Geology, Department of Geology and Soil Sciences, Ghent University, Krijgslaan 281 S8, B-9000 Ghent, Belgium</footnote>

<footnote n="8">⁸Institut Méditerranéen de Biodiversité et d'Ecologie marine et occidentale (IMBE), Aix-Marseille Université, CNRS, 13545 Aix en Provence, France</footnote>