Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up

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The Mimir dacite originated from upper-crustal metapelitic sources at depths less than 5 kbar.
U-Pb zircon analyses indicate a crystallization age of 54.6 ± 1.1 Ma, after the Paleocene-Eocene Thermal Maximum.
Thermobarometric calculations confirm the dacite was formed at temperatures of 750–800°C with substantial water content up to 3 wt%.

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Comprehensive analysis reveals low-pressure, high-temperature magma formation in upper crust, suggesting geodynamic changes.

Morris et al. (2024) studied this question.

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