Wieser, Penny E. and Edmonds, Marie and Maclennan, John and Wheeler, John (2020) Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawaiʻi. Nature Communications, 11 (1). ISSN 2041-1723 DOI https://doi.org/10.1038/s41467-019-13635-y
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Abstract
Distorted olivines of enigmatic origin are ubiquitous in erupted products from a wide range of volcanic systems (e.g., Hawaiʻi, Iceland, Andes). Investigation of these features at Kīlauea Volcano, Hawaiʻi, using an integrative crystallographic and chemical approach places quantitative constraints on mush pile thicknesses. Electron backscatter diffraction (EBSD) reveals that the microstructural features of distorted olivines, whose chemical composition is distinct from undistorted olivines, are remarkably similar to olivines within deformed mantle peridotites, but inconsistent with an origin from dendritic growth. This, alongside the spatial distribution of distorted grains and the absence of adcumulate textures, suggests that olivines were deformed within melt-rich mush piles accumulating within the summit reservoir. Quantitative analysis of subgrain geometry reveals that olivines experienced differential stresses of ∼3–12 MPa, consistent with their storage in mush piles with thicknesses of a few hundred metres. Overall, our microstructural analysis of erupted crystals provides novel insights into mush-rich magmatic systems.
Item Type: | Article |
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Uncontrolled Keywords: | 2019AREP; IA76 |
Subjects: | 05 - Petrology - Igneous, Metamorphic and Volcanic Studies |
Divisions: | 05 - Petrology - Igneous, Metamorphic and Volcanic Studies 07 - Gold Open Access 12 - PhD |
Journal or Publication Title: | Nature Communications |
Volume: | 11 |
Identification Number: | https://doi.org/10.1038/s41467-019-13635-y |
Depositing User: | Sarah Humbert |
Date Deposited: | 24 Jan 2020 12:49 |
Last Modified: | 24 Jan 2020 12:49 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/4617 |
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