Fine physical and chemical features of volcanic ashes : applications to tephrostratigraphy ; Caractéristiques physiques et chimiques fines des cendres volcaniques : application à la téphrostratigraphie

The challenge of this work was to carry out several tephrostratigraphic studies in various sedimentary environments in order to test the efficiency of classical detection methods of tephra layers. First, analysis has been focused on tephra keys, previously studied in known sites, in Belgium and in the Jura Mountains, in order to update data with current analytical techniques. This work was later expanded to sites from eastern French Massif Central, an area with unexploited tephrostratigraphic potential, which offers the possibility to precise the source of cryptotephras identified in the Jura... Mehr ...