Show simple item record

dc.contributor.author
Violay, M.
dc.contributor.author
Heap, M.J.
dc.contributor.author
Acosta, M.
dc.contributor.author
Madonna, Claudio
dc.date.accessioned
2018-01-10T09:29:27Z
dc.date.available
2017-10-06T02:58:54Z
dc.date.available
2017-10-16T09:14:26Z
dc.date.available
2017-10-26T07:35:10Z
dc.date.available
2017-12-06T13:34:17Z
dc.date.available
2018-01-10T09:29:27Z
dc.date.issued
2017-08-09
dc.identifier.other
10.1038/s41598-017-08108-5
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/227227
dc.identifier.doi
10.3929/ethz-b-000191226
dc.description.abstract
Recently, projects have been proposed to engineer deep geothermal reservoirs in the ductile crust. To examine their feasibility, we performed high-temperature (up to 1000 °C), high-pressure (130 MPa) triaxial experiments on granite (initially-intact and shock-cooled samples) in which we measured the evolution of porosity during deformation. Mechanical data and post-mortem microstuctural characterisation (X-ray computed tomography and scanning electron microscopy) indicate that (1) the failure mode was brittle up to 900 °C (shear fracture formation) but ductile at 1000 °C (no strain localisation); (2) only deformation up to 800 °C was dilatant; (3) deformation at 900 °C was brittle but associated with net compaction due to an increase in the efficiency of crystal plastic processes; (4) ductile deformation at 1000 °C was compactant; (5) thermally-shocking the granite did not influence strength or failure mode. Our data show that, while brittle behaviour increases porosity, porosity loss is associated with both ductile behaviour and transitional behaviour as the failure mode evolves from brittle to ductile. Extrapolating our data to geological strain rates suggests that the brittle-ductile transition occurs at a temperature of 400 ± 100 °C, and is associated with the limit of fluid circulation in the deep continental crust.
en_US
dc.language.iso
en
en_US
dc.publisher
Nature Publishing Group
en_US
dc.subject
Geophysics
en_US
dc.subject
Structural geology
en_US
dc.subject
Tectonics
en_US
dc.title
Porosity evolution at the brittle-ductile transition in the continental crust: Implications for deep hydro-geothermal circulation
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Scientific Reports
ethz.journal.volume
7
en_US
ethz.pages.start
7705
en_US
ethz.size
8 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
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::03392 - Burg, Jean-Pierre (emeritus)
en_US
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::03392 - Burg, Jean-Pierre (emeritus)
en_US
ethz.date.deposited
2017-10-06T02:59:09Z
ethz.source
WOS
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-01-10T14:01:56Z
ethz.rosetta.lastUpdated
2019-01-02T11:21:58Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/191226
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/218361
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=Porosity%20evolution%20at%20the%20brittle-ductile%20transition%20in%20the%20continental%20crust:%20Implications%20for%20deep%20hydro-geothermal%20circulation&rft.jtitle=Scientific%20Reports&rft.date=2017-08-09&rft.volume=7&rft.spage=7705&rft.au=Violay,%20M.&Heap,%20M.J.&Acosta,%20M.&Madonna,%20Claudio&rft.genre=article&
 Search via SFX

Files in this item

Thumbnail

Publication type

Show simple item record