Melt inclusion and matrix glass data from the 43 BCE eruption of Okmok Volcano

Peccia, Ally; ORCID: 0000-0003-1985-2417
Moussallam, Yves; ORCID: 0000-0002-4707-8943
Plank, Terry; ORCID: 0000-0002-1665-04
Here, we present major element and volatile concentrations for a suite of 19 olivine(Fo38-87)- and plagioclase(An38-86)-hosted melt inclusions and 23 matrix glasses from 4 bulk samples collected from the 43 BCE caldera-forming eruption of Okmok Volcano, Alaska (Okmok II). This eruption has recently been connected with a sulfur-rich layer in Greenland ice cores that contains tephra matching the geochemical composition of Okmok II eruptive products. Proxy evidence of climate cooling and historical observations of extreme climate also coincide with the timing of Okmok II, thus prompting further study of the volatiles released during the eruption. Melt inclusions, host crystals, and matrix glasses were singly polished and analyzed by Electron Microprobe, with select inclusions also measured by Secondary Ion Mass Spectrometry (SIMS), with the goal of producing a total petrologic S load for the Okmok II eruption. SIMS analysis was carried out with a Cs+ beam, and oxygen-normalized ratios were calibrated using DTM basaltic glass standards with all calibration lines being highly linear (r2>0.98). For further description of melt inclusion populations and volatile content, refer to publication main text and supplementary information.
How to cite this dataset:
Peccia, A., Moussallam, Y., Plank, T., 2023. Melt inclusion and matrix glass data from the 43 BCE eruption of Okmok Volcano, Version 1.0. Interdisciplinary Earth Data Alliance (IEDA). Accessed 2024-05-21.
DOI Creation Date:
Peccia, A., Moussallam, Y., Plank, T., DallaSanta, K., Polvani, L. M., Burgisser, A., et al. (2023). A New Multi-Method Assessment of Stratospheric Sulfur Load from the Okmok II Caldera-Forming Eruption of 43 BCE. Geophysical Research Letters.
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Creative Commons Attribution-ShareAlike 4.0 International [CC-BY-SA-4.0]
Coverage Scope: Regional (Continents, Oceans)
Geographic Location: Okmok Volcano, Alaska
User Contributed Keyword(s):
melt inclusions, volatiles, climate-volcano interactions, petrologic volatile load
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Smithsonian Volcano Number: 311290
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