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dc.contributor.author
Bernard, Rachel E.
dc.contributor.author
Schulte-Pelkum, Vera
dc.contributor.author
Behr, Whitney M.
dc.date.accessioned
2021-07-30T10:34:35Z
dc.date.available
2021-07-30T02:31:30Z
dc.date.available
2021-07-30T10:34:35Z
dc.date.issued
2021-09-05
dc.identifier.issn
0040-1951
dc.identifier.other
10.1016/j.tecto.2021.228954
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/498477
dc.identifier.doi
10.3929/ethz-b-000498477
dc.description.abstract
Orthopyroxene is the second most abundant mineral in the upper mantle and, like olivine, can form crystallographic preferred orientations (CPO) during mantle deformation that may influence mantle seismic anisotropy. Here we use a compilation of 21 peridotites in which both olivine and orthopyroxene CPOs are preserved to document the range of orthopyroxene CPO types and to explore their effects on seismic anisotropy of peridotites. In addition to four previously published orthopyroxene CPO types, this study establishes three new CPO types, two of which result in orthopyroxene fast axes aligned parallel to the lineation and the direction of mantle shear/flow. We calculate bulk elastic tensors for each sample from the measured olivine and orthopyroxene CPOs, and use those in turn to calculate Vp and Vs velocities and anisotropy percentages. In order to explore the relative influence of olivine and orthopyroxene on anisotropy, these properties were calculated for a range of possible modal percentages, from 100% olivine to 100% orthopyroxene. While the effect of orthopyroxene CPO appears to be a negligible influence on the orientation of bulk seismic fast axes, the presence of increasing orthopyroxene decreases the anisotropic signal overall. However, at very low olivine modal percentages, olivine and orthopyroxene can be mutually destructive, where the addition of olivine to a mostly orthopyroxene rock can actually decrease anisotropy.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.title
The competing effects of olivine and orthopyroxene CPO on seismic anisotropy
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2021-06-05
ethz.journal.title
Tectonophysics
ethz.journal.volume
814
en_US
ethz.journal.abbreviated
Tectonophysics
ethz.pages.start
228954
en_US
ethz.size
10 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::09636 - Behr, Whitney / Behr, Whitney
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::09636 - Behr, Whitney / Behr, Whitney
ethz.date.deposited
2021-07-30T02:31:47Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-07-30T10:35:02Z
ethz.rosetta.lastUpdated
2021-07-30T10:35:02Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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