Le volcanisme acide burdigalien du Sud de la Corse : pétrologie, datation K–Ar, paléomagnétisme

Abstract

A new rhyolitic tuff outcrop has been discovered in southern Corsica, at Francolu. It shares a calc-alkaline affinity with nearby, previously known, rhyolitic Balistra tuff and dacitic ignimbritic Tre Paduli tuff. A weighted mean age of 19.3±0.5 Ma has been obtained using the K–Ar method on tuff glasses from these three formations. Synchronous emplacement is also indicated by the coherent reverse palaeomagnetic directions, which further imply that only about half of the Corsica–Sardinia rotation was completed at 19 Ma.