Reply to comment on “Long or short silicic magma residence time beneath Hekla volcano, Iceland?”

Abstract

We would like to thank Geist et al. (2023) for the opportunity to further discuss the arguments presented in our paper “Long or short silicic magma residence time beneath Hekla volcano, Iceland?” (Sigmarsson et al. 2022). The disagreement centres around the origin of the silicic magmas at Hekla, namely whether it is by (i) fractional crystallisation and a long crustal residence time before eruption or (ii) partial melting of altered basaltic crust and short transfer time to the surface. We disagree with the arguments presented by Geist et al. (2023) against the model for the origin of dacite at Hekla from dehydration melting of amphibolite, a model that still explains most if not all results obtained so far on the Hekla magma suite.