Mantle-derived trace element variability in olivines and their melt inclusions
Trace element variability in oceanic basalts is commonly used to constrain the physics of mantle melting and the chemistry of Earth's deep interior. However, the geochemical properties of mantle melts are often overprinted by mixing and crystallisation processes during ascent and storage. Study...
Published in: | Earth and Planetary Science Letters |
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2018
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Online Access: | https://research.manchester.ac.uk/en/publications/84b77b86-3463-4184-939c-12b9045bb798 https://doi.org/10.1016/j.epsl.2017.12.014 https://pure.manchester.ac.uk/ws/files/85042615/dnos17r4.pdf http://www.scopus.com/inward/record.url?scp=85038217144&partnerID=8YFLogxK |
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ftumanchesterpub:oai:pure.atira.dk:publications/84b77b86-3463-4184-939c-12b9045bb798 2023-11-12T04:19:13+01:00 Mantle-derived trace element variability in olivines and their melt inclusions Neave, David A. Shorttle, Oliver Oeser, Martin Weyer, Stefan Kobayashi, Katsura 2018-02-01 application/pdf https://research.manchester.ac.uk/en/publications/84b77b86-3463-4184-939c-12b9045bb798 https://doi.org/10.1016/j.epsl.2017.12.014 https://pure.manchester.ac.uk/ws/files/85042615/dnos17r4.pdf http://www.scopus.com/inward/record.url?scp=85038217144&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Neave , D A , Shorttle , O , Oeser , M , Weyer , S & Kobayashi , K 2018 , ' Mantle-derived trace element variability in olivines and their melt inclusions ' , Earth and Planetary Science Letters , vol. 483 , pp. 90-104 . https://doi.org/10.1016/j.epsl.2017.12.014 geochemical variability Iceland mantle heterogeneity melt inclusions olivine trace elements article 2018 ftumanchesterpub https://doi.org/10.1016/j.epsl.2017.12.014 2023-10-30T09:17:41Z Trace element variability in oceanic basalts is commonly used to constrain the physics of mantle melting and the chemistry of Earth's deep interior. However, the geochemical properties of mantle melts are often overprinted by mixing and crystallisation processes during ascent and storage. Studying primitive melt inclusions offers one solution to this problem, but the fidelity of the melt-inclusion archive to bulk magma chemistry has been repeatedly questioned. To provide a novel check of the melt inclusion record, we present new major and trace element analyses from olivine macrocrysts in the products of two geographically proximal, yet compositionally distinct, primitive eruptions from the Reykjanes Peninsula of Iceland. By combining these macrocryst analyses with new and published melt inclusion analyses we demonstrate that olivines have similar patterns of incompatible trace element (ITE) variability to the inclusions they host, capturing chemical systematics on intra- and inter-eruption scales. ITE variability (element concentrations, ratios, variances and variance ratios) in olivines from the ITE-enriched Stapafell eruption is best accounted for by olivine-dominated fractional crystallisation. In contrast, ITE variability in olivines and inclusions from the ITE-depleted Háleyjabunga eruption cannot be explained by crystallisation alone, and must have originated in the mantle. Compatible trace element (CTE) variability is best described by crystallisation processes in both eruptions. Modest correlations between host and inclusion ITE contents in samples from Háleyjabunga suggest that melt inclusions can be faithful archives of melting and magmatic processes. It also indicates that degrees of ITE enrichment can be estimated from olivines directly when melt inclusion and matrix glass records of geochemical variability are poor or absent. Inter-eruption differences in olivine ITE systematics between Stapafell and Háleyjabunga mirror differences in melt inclusion suites, and confirm that the Stapafell eruption ... Article in Journal/Newspaper Iceland The University of Manchester: Research Explorer Earth and Planetary Science Letters 483 90 104 |
institution |
Open Polar |
collection |
The University of Manchester: Research Explorer |
op_collection_id |
ftumanchesterpub |
language |
English |
topic |
geochemical variability Iceland mantle heterogeneity melt inclusions olivine trace elements |
spellingShingle |
geochemical variability Iceland mantle heterogeneity melt inclusions olivine trace elements Neave, David A. Shorttle, Oliver Oeser, Martin Weyer, Stefan Kobayashi, Katsura Mantle-derived trace element variability in olivines and their melt inclusions |
topic_facet |
geochemical variability Iceland mantle heterogeneity melt inclusions olivine trace elements |
description |
Trace element variability in oceanic basalts is commonly used to constrain the physics of mantle melting and the chemistry of Earth's deep interior. However, the geochemical properties of mantle melts are often overprinted by mixing and crystallisation processes during ascent and storage. Studying primitive melt inclusions offers one solution to this problem, but the fidelity of the melt-inclusion archive to bulk magma chemistry has been repeatedly questioned. To provide a novel check of the melt inclusion record, we present new major and trace element analyses from olivine macrocrysts in the products of two geographically proximal, yet compositionally distinct, primitive eruptions from the Reykjanes Peninsula of Iceland. By combining these macrocryst analyses with new and published melt inclusion analyses we demonstrate that olivines have similar patterns of incompatible trace element (ITE) variability to the inclusions they host, capturing chemical systematics on intra- and inter-eruption scales. ITE variability (element concentrations, ratios, variances and variance ratios) in olivines from the ITE-enriched Stapafell eruption is best accounted for by olivine-dominated fractional crystallisation. In contrast, ITE variability in olivines and inclusions from the ITE-depleted Háleyjabunga eruption cannot be explained by crystallisation alone, and must have originated in the mantle. Compatible trace element (CTE) variability is best described by crystallisation processes in both eruptions. Modest correlations between host and inclusion ITE contents in samples from Háleyjabunga suggest that melt inclusions can be faithful archives of melting and magmatic processes. It also indicates that degrees of ITE enrichment can be estimated from olivines directly when melt inclusion and matrix glass records of geochemical variability are poor or absent. Inter-eruption differences in olivine ITE systematics between Stapafell and Háleyjabunga mirror differences in melt inclusion suites, and confirm that the Stapafell eruption ... |
format |
Article in Journal/Newspaper |
author |
Neave, David A. Shorttle, Oliver Oeser, Martin Weyer, Stefan Kobayashi, Katsura |
author_facet |
Neave, David A. Shorttle, Oliver Oeser, Martin Weyer, Stefan Kobayashi, Katsura |
author_sort |
Neave, David A. |
title |
Mantle-derived trace element variability in olivines and their melt inclusions |
title_short |
Mantle-derived trace element variability in olivines and their melt inclusions |
title_full |
Mantle-derived trace element variability in olivines and their melt inclusions |
title_fullStr |
Mantle-derived trace element variability in olivines and their melt inclusions |
title_full_unstemmed |
Mantle-derived trace element variability in olivines and their melt inclusions |
title_sort |
mantle-derived trace element variability in olivines and their melt inclusions |
publishDate |
2018 |
url |
https://research.manchester.ac.uk/en/publications/84b77b86-3463-4184-939c-12b9045bb798 https://doi.org/10.1016/j.epsl.2017.12.014 https://pure.manchester.ac.uk/ws/files/85042615/dnos17r4.pdf http://www.scopus.com/inward/record.url?scp=85038217144&partnerID=8YFLogxK |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Neave , D A , Shorttle , O , Oeser , M , Weyer , S & Kobayashi , K 2018 , ' Mantle-derived trace element variability in olivines and their melt inclusions ' , Earth and Planetary Science Letters , vol. 483 , pp. 90-104 . https://doi.org/10.1016/j.epsl.2017.12.014 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2017.12.014 |
container_title |
Earth and Planetary Science Letters |
container_volume |
483 |
container_start_page |
90 |
op_container_end_page |
104 |
_version_ |
1782335712259997696 |