International Journal of Earth Sciences International Journal of Earth Sciences, 2020, 109 (1), pp.171-196. ⟨10.1007/s00531-019-01796-6⟩ International Journal of Earth Sciences, Springer Verlag, 2020, 109 (1), pp.171-196. ⟨10.1007/s00531-019-01796-6⟩