A possible sea-level fall trigger for the youngest rejuvenated volcanism in Hawaiʻi
نویسندگان
چکیده
Many intraplate oceanic islands undergo “rejuvenated” volcanism following the main edifice-building stage. Honolulu features Hawaiʻi’s most recent rejuvenated volcanism. K-Ar dating of suggests that it started at ca. 750 ka and ended <100 ka. Here, we present new 40Ar/39Ar ages olivine diffusion modeling from Koko Rift lavas to resolve when eruptions occurred evaluate possible mechanisms volcanic hazards. Diffusion zoning profiles in basalts magmas were stored crust for many months prior eruption. Six cluster 67 ± 2 (2σ), which demonstrates is youngest known area The timing coincides with pronounced drop global sea level (∼100 m) during Marine Isotope Stage 4. This major sea-level fall may have triggered years < 15 km depth. proposed mechanism similar other islands, changes significant control on magnitude frequency ocean island volcanoes.
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ژورنال
عنوان ژورنال: Geological Society of America Bulletin
سال: 2023
ISSN: ['1943-2674', '0016-7606']
DOI: https://doi.org/10.1130/b36615.1