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Crystal scavenging from mush piles recorded by melt inclusions

Wieser, Penny E.; Edmonds, Marie; Maclennan, John; Jenner, Frances E. and Kunz, Barbara E. (2019). Crystal scavenging from mush piles recorded by melt inclusions. Nature Communications, 10, article no. 5797.

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Olivine-hosted melt inclusions are commonly used to determine pre-eruptive storage conditions. However, this approach relies on the assumption that co-erupted olivines have a simple association with their carrier melts. We show that primitive olivine crystal cargoes and their melt inclusions display a high degree of geochemical disequilibrium with their carrier melts at Kīlauea Volcano, Hawai’i. Within a given eruption, melt inclusions trapped in primitive olivine crystals exhibit compositional diversity exceeding that in erupted lava compositions since 1790 CE. This demonstrates that erupting liquids scavenge crystal cargoes from mush piles accumulating diverse melt inclusion populations over timescales of centuries or longer. Entrainment of hot primitive olivines into cooler, evolved carrier melts drives post-entrapment crystallization and sequestration of CO2 into vapour bubbles, producing spurious barometric estimates. While scavenged melt inclusion records may not be suitable for the investigation of eruption-specific processes, they record timescales of crystal storage and remobilization within magmatic mush piles.

Item Type: Journal Item
Copyright Holders: 2019 The Author(s)
ISSN: 2041-1723
Project Funding Details:
Funded Project NameProject IDFunding Body
From Arc Magmas to Ores (FAMOS): A mineral systems approachNE/P017045/1NERC (Natural Environment Research Council)
Keywords: Geochemistry; Petrology; Volcanology
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 68704
Depositing User: Frances Jenner
Date Deposited: 06 Jan 2020 09:36
Last Modified: 12 Jun 2020 13:01
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