Deglaciation, volcanism and seismicity: the Icelandic record in the northern Atlantic during the Eemian and the Holocene

Deglaciation, volcanism and seismicity: the Icelandic record in the northern Atlantic during the Eemian and the Holocene

Van Vliet-Lanoë Brigitte ⁽¹⁾, Guillou Hervé ⁽²⁾, Bergerat Françoise⁽³), Chazot Gilles⁽¹⁾, Innocent Christophe ⁽⁴⁾,  Nonotte Philippe⁽¹⁾ , Liorzou Céline⁽¹⁾

• 1) Bretagne Occidentale, CNRS UMR 6538 Géosciences Océan 29280 Plouzané, France. brigitte.vanvlietlanoe@univ-brest.fr; gilles.chazot@univ-brest.fr, philippe.nonnote@univ-brest.fr, celine.liorzou@univ-brest.fr
• 2) CNRS-CEA, UMR 8212 LSCE. Gif /Yvette, France. guillou@lsce.ipsl.fr
• 3) Sorbonne Université, CNRS, Institut des Sciences de la Terre de Paris (ISTeP), UMR 7193, 4 place Jussieu 75005 Paris, France, bergerat@sorbonne-universite.fr
• 4) BRGM – LAB/ISO, Orléans cedex 2- France - innocent@brgm.fr

 

Large estuarine and lacustrine deposits in South, S-W, North and NE (Van Vliet-Lanoë et al., 2007, 2010, 2018), Iceland allow a fair record of the history of the deglaciation at MIS 3/2, 2/1, late 1 and MIS 6/5e, late 5e periods, consolidated with dating (Guillou et al. 2010, 2019, VVL et al. 2018). Pulsed deglaciations are all under control of orbital forcing and DO events, in association with a modification in the path of the Irminger current. In both systems, the history of the volcanic activity for Grἰmsvötn, Bárðarbunga, Askja and Hekla volcanoes are very similar, in connection with glacial unloading history. Tectonic activity and seismicity increased temporarily during deglaciation events leading to the discrete activity of inland SDR (Bourgeois et al., 2005, Bergerat & Plateau, 2012). Large earthquakes are restricted to full interglacial conditions (VVL et al., 2005, - on line). Hyaloclastite ridges are ice margin features related to long partial unloading events. The extent of these patterns to full glacial conditions revealed very unstable ice sheets under control of DO events and the associated gravitational spreading, leading to the formation of temporary ice shelves or grounded glacier margins.  

 

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