Aaron Pietruszka

May 25, 2023 | pubs.geoscienceworld.org | Aaron Pietruszka |Michael Garcia |Richard Carlson

The large range in 226Ra-230Th disequilibria at Kama‘ehu is likely dominated by post-eruptive 226Ra decay. Alternative explanations, such as magma residence time in the crust or large changes in the (226Ra/230Th) ratio of the parental magma, are unlikely. At Kīlauea, for example, the duration of magma storage within the volcano’s plumbing system (<20 yr; Pietruszka et al., 2018) is insignificant relative to the half-life of 226Ra. The magma residence time at Kama‘ehu is unknown.