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

Article Geochemistry & Geophysics

A discussion of: long or short silicic magma residence time beneath Hekla volcano, Iceland?

Dennis Geist et al.

Summary: The compositions of dacites erupted from Hekla Volcano in Iceland are inconsistent with the hypothesis of a volcanic origin. Instead, the data support the idea that dacitic melts are derived from andesitic melts through crystallization. The application of direct concentration measurements rather than ratios in the models confirms the validity of the crystallization hypothesis, especially when accounting for uncertainties.

CONTRIBUTIONS TO MINERALOGY AND PETROLOGY (2023)

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Article Geochemistry & Geophysics

Long or short silicic magma residence time beneath Hekla volcano, Iceland?

Olgeir Sigmarsson et al.

Summary: The timescales of magma transfer and differentiation can be estimated using isotope compositions. Recent studies suggest that the volcanic activity at Mt. Hekla in Iceland is influenced by crustal melting rather than just fractional crystallization. The formation, storage, differentiation, and eruption of silicic magma at Hekla occurred over a timescale of a few centuries. Additionally, there has been a decreasing production of silicic magma during the Holocene period, indicating changes in the crustal magma source.

CONTRIBUTIONS TO MINERALOGY AND PETROLOGY (2022)

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Article Geochemistry & Geophysics

Hekla Revisited: Fractionation of a Magma Body at Historical Timescales

Dennis Geist et al.

Summary: The research findings indicate that Hekla volcano eruptions exhibit zoned compositions from felsic to mafic, with the extent of zoning directly related to the length of repose since the previous eruption. The unusual geometry of the magma body and its processes of replenishment, cooling, and crystallization explain the unique mineral composition and geophysical activity of the volcano.

JOURNAL OF PETROLOGY (2021)

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Article Geochemistry & Geophysics

Chlorine isotope ratios record magmatic brine assimilation during rhyolite genesis

E. Ranta et al.

Summary: The delta Cl-37 values of silicic volcanic rocks are systematically shifted to more negative values compared to associated basalts and intermediate rocks, indicating assimilation of magmatic brines stored in long lived crustal magma mushes. This shows that magmatic brine assimilation is a fundamental, yet previously unrecognized, part of rhyolite genesis.

GEOCHEMICAL PERSPECTIVES LETTERS (2021)

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Article Chemistry, Multidisciplinary

Bunsen the Geochemist: Icelandic Volcanism, Geyser Theory, and Gas, Rock and Mineral Analyses

Curt Wentrup

Summary: After participating in a geochemical expedition to Iceland in 1845-1846, Bunsen accurately characterized volcanic gases, classified fundamental rock types, and revealed the correct mechanism of geyser action. He vehemently opposed hypotheses and differed with other scientists on the chemical compositions of rocks and minerals.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Geosciences, Multidisciplinary