International Journal of Earth Sciences International Journal of Earth Sciences, Springer Verlag, 2021, 110, pp.1117-1121. ⟨10.1007/s00531-021-01983-4⟩ International Journal of Earth Sciences, 2021, 110 (3), pp.1117-1121. ⟨10.1007/s00531-021-01983-4⟩