Reply to comment on “Long or short silicic magma residence time beneath Hekla volcano, Iceland?” by Sigmarsson O, Bergþórsdóttir I A, Devidal J-L, Larsen G, Gannoun A

• Published in: Contributions to Mineralogy and Petrology
• Main Author: Sigmarsson, Olgeir
• Other Authors: Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2023
• Subjects: Silicic magma; Hekla volcano; Amphibolite dehydration melting; Th isotopes; Th/U; [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry; Hekla; Iceland
• Online Access: https://uca.hal.science/hal-04219454; https://uca.hal.science/hal-04219454/document; https://uca.hal.science/hal-04219454/file/Final%20clean%20revised%20ms%20of%20a%20Reply_Sigmarsson.pdf; https://doi.org/10.1007/s00410-023-02051-7

International audience 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