Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawai'i.
Distorted olivines of enigmatic origin are ubiquitous in erupted products from a wide range of volcanic systems (e.g., Hawai'i, Iceland, Andes). Investigation of these features at Kīlauea Volcano, Hawai'i, using an integrative crystallographic and chemical approach places quantitative cons...
Main Authors: | , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Apollo - University of Cambridge Repository
2020
|
Subjects: | |
Online Access: | https://dx.doi.org/10.17863/cam.48954 https://www.repository.cam.ac.uk/handle/1810/301886 |
id |
ftdatacite:10.17863/cam.48954 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.17863/cam.48954 2023-05-15T16:49:25+02:00 Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawai'i. Wieser, Penny E Edmonds, Marie Maclennan, John Wheeler, John 2020 https://dx.doi.org/10.17863/cam.48954 https://www.repository.cam.ac.uk/handle/1810/301886 unknown Apollo - University of Cambridge Repository Attribution 4.0 International https://creativecommons.org/licenses/by/4.0 CC-BY Text Article article-journal ScholarlyArticle 2020 ftdatacite https://doi.org/10.17863/cam.48954 2021-11-05T12:55:41Z Distorted olivines of enigmatic origin are ubiquitous in erupted products from a wide range of volcanic systems (e.g., Hawai'i, Iceland, Andes). Investigation of these features at Kīlauea Volcano, Hawai'i, 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. Text Iceland DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
description |
Distorted olivines of enigmatic origin are ubiquitous in erupted products from a wide range of volcanic systems (e.g., Hawai'i, Iceland, Andes). Investigation of these features at Kīlauea Volcano, Hawai'i, 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. |
format |
Text |
author |
Wieser, Penny E Edmonds, Marie Maclennan, John Wheeler, John |
spellingShingle |
Wieser, Penny E Edmonds, Marie Maclennan, John Wheeler, John Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawai'i. |
author_facet |
Wieser, Penny E Edmonds, Marie Maclennan, John Wheeler, John |
author_sort |
Wieser, Penny E |
title |
Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawai'i. |
title_short |
Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawai'i. |
title_full |
Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawai'i. |
title_fullStr |
Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawai'i. |
title_full_unstemmed |
Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawai'i. |
title_sort |
microstructural constraints on magmatic mushes under kīlauea volcano, hawai'i. |
publisher |
Apollo - University of Cambridge Repository |
publishDate |
2020 |
url |
https://dx.doi.org/10.17863/cam.48954 https://www.repository.cam.ac.uk/handle/1810/301886 |
genre |
Iceland |
genre_facet |
Iceland |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.17863/cam.48954 |
_version_ |
1766039556134535168 |