Climate of the Past
Climate of the Past
CP
Articles | Volume 17, issue 4
Articles | Volume 17, issue 4
https://doi.org/10.5194/cp-17-1547-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-17-1547-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 17, issue 4
Research article
 | 
21 Jul 2021
Research article |  | 21 Jul 2021

Million-year-scale alternation of warm–humid and semi-arid periods as a mid-latitude climate mode in the Early Jurassic (late Sinemurian, Laurasian Seaway)

Thomas Munier, Jean-François Deconinck, Pierre Pellenard, Stephen P. Hesselbo, James B. Riding, Clemens V. Ullmann, Cédric Bougeault, Mathilde Mercuzot, Anne-Lise Santoni, Émilia Huret, and Philippe Landrein

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Short summary
Clay minerals are witnesses of alteration conditions in continental environments. Lacking high-resolution data on clay minerals, this work highlights wet and semi-arid cycles at mid-latitude in the upper Sinemurian. The higher proportion of kaolinite in the upper part of the obtusum zone and in the oxynotum zone indicates an increase in hydrolysis conditions in a warmer period confirmed by carbon isotopes.
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