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dc.contributor.author
Bayrakci, Gaye
dc.contributor.author
Falcón-Suárez, Ismael Himar
dc.contributor.author
Minshull, Timothy A.
dc.contributor.author
North, Laurence J.
dc.contributor.author
Barker, Abigail K.
dc.contributor.author
Zihlmann, Barbara
dc.contributor.author
Rouméjon, Stephane
dc.contributor.author
Best, Angus Ian
dc.date.accessioned
2018-12-18T11:32:34Z
dc.date.available
2018-12-16T06:39:29Z
dc.date.available
2018-12-18T11:32:34Z
dc.date.issued
2018-11
dc.identifier.issn
1525-2027
dc.identifier.other
10.1029/2018GC007738
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/311065
dc.description.abstract
We analyzed the physical properties of altered mafic and ultramafic rocks drilled at the Atlantis Massif (Mid‐Atlantic Ridge, 30°N; Integrated Ocean Discovery Program Expeditions 304‐305 and 357). Our objective was to find a physical property that allows direct distinction between these lithologies using remote geophysical methods. Our data set includes the density, the porosity, P and S wave velocities, the electrical resistivity, and the permeability of mafic and ultramafic samples under shallow subsurface conditions (confining pressure up to 50 MPa equivalent to ~2‐km depth). In shallow subsurface conditions, mafic and ultramafic samples showed distinct differences in the density, the seismic wave velocities, and the electrical resistivity (mafic samples: 2,840 to 2,860 kg/m3, 5.92 to 6.70 km/s, and 60 to 221 Ω m; ultramafic samples: 2,370 to 2,790 kg/m3, 3.36 and 3.62 km/s, and 8 to 44 Ω m). However, we observed an overlap between physical properties of mafic and ultramafic rocks when we compared our measurements with those acquired from similar environments. The anisotropic homogeneous electrical resistivity inversion shows transverse isotropy symmetry, which is typical of a foliated microstructure. In both the inversion results and the thin sections, the direction of high resistivity axes of ultramafic rock samples is systematically perpendicular to the equivalent axes in mafic rock samples analyzed in this study. Our sample scale study suggests that electrical resistivity anisotropy may allow us to distinguish mafic and ultramafic lithologies via controlled source electromagnetic surveys. When surface conduction is negligible, the electrical resistivity can be used as proxy for permeability.
en_US
dc.language.iso
en
en_US
dc.publisher
Wiley
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
mafic rocks
en_US
dc.subject
ultramafic rocks
en_US
dc.subject
Atlantis Massif
en_US
dc.subject
permeability
en_US
dc.subject
electrical resistivity
en_US
dc.subject
anisotropy
en_US
dc.title
Anisotropic Physical Properties of Mafic and Ultramafic Rocks From an Oceanic Core Complex
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2018-10-24
ethz.journal.title
Geochemistry, Geophysics, Geosystems
ethz.journal.volume
19
en_US
ethz.journal.issue
11
en_US
ethz.journal.abbreviated
Geochem. geophys. geosyst.
ethz.pages.start
4366
en_US
ethz.pages.end
4384
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Hydration and carbonation of mantle peridotite: Drilling the Atlantis Massif (MAR 30°N) and the Samail ophiolite (Oman)
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Hoboken, NJ
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::08808 - Bernasconi-Green, Gretchen (Tit.-Prof.)
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::08808 - Bernasconi-Green, Gretchen (Tit.-Prof.)
ethz.grant.agreementno
163187
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Projektförderung in Mathematik, Natur- und Ingenieurwissenschaften (Abteilung II)
ethz.date.deposited
2018-12-16T06:39:45Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-12-18T11:32:45Z
ethz.rosetta.lastUpdated
2019-02-03T12:44:07Z
ethz.rosetta.versionExported
true
ethz.COinS
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