Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7775
DC FieldValueLanguage
dc.contributor.authorallHeap, M. J.en
dc.contributor.authorallBaud, P.en
dc.contributor.authorallMeredith, P. G.en
dc.contributor.authorallVinciguerra, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallBell, A. F.en
dc.contributor.authorallMain, I. G.en
dc.date.accessioned2012-02-22T11:27:24Zen
dc.date.available2012-02-22T11:27:24Zen
dc.date.issued2011en
dc.identifier.urihttp://hdl.handle.net/2122/7775en
dc.description.abstractTime-dependent brittle deformation is a fundamental and pervasive process operating in the Earth's upper crust. Its characterization is a pre-requisite to understanding and unraveling the complexities of crustal evolution and dynamics. The preferential chemical interaction between pore fluids and strained atomic bonds at crack tips, a mechanism known as stress corrosion, allows rock to fail under a constant stress that is well below its short-term strength over an extended period of time; a process known as brittle creep. Here we present the first experimental measurements of brittle creep in a basic igneous rock (a basalt from Mt. Etna volcano) under triaxial stress conditions. Results from conventional creep experiments show that creep strain rates are highly dependent on the level of applied stress (and can be equally well fit by a power law or an exponential law); with a 20% increase in stress producing close to three orders of magnitude increase in creep strain rate. Results from stress-stepping creep experiments show that creep strain rates are also influenced by the imposed effective confining pressure. We show that only part of this change can be attributed to the purely mechanical influence of an increase in effective pressure, with the remainder interpreted as due to a reduction in stress corrosion reactions; the result of a reduction in crack aperture that restricts the rate of transport of reactive species to crack tips. Overall, our results also suggest that a critical level of crack damage is required before the deformation starts to accelerate to failure, regardless of the level of applied stress and the time taken to reach this point. The experimental results are discussed in terms of microstructural observations and fits to a macroscopic creep law, and compared with the observed deformation history at Mt. Etna volcano.en
dc.language.isoEnglishen
dc.publisher.nameElsevier Science Limiteden
dc.relation.ispartofEarth and planetary science lettersen
dc.relation.ispartofseries1-2/307(2011)en
dc.subjectstress corrosionen
dc.titleBrittle creep in basalt and its application to time-dependent volcano deformationen
dc.typearticleen
dc.description.statusPublisheden
dc.description.pagenumber71–82en
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneousen
dc.identifier.doi10.1016/j.epsl.2011.04.035en
dc.description.journalTypeJCR Journalen
dc.description.fulltextrestricteden
dc.relation.issn0012-821Xen
dc.relation.eissn1385-013Xen
dc.contributor.authorHeap, M. J.en
dc.contributor.authorBaud, P.en
dc.contributor.authorMeredith, P. G.en
dc.contributor.authorVinciguerra, S.en
dc.contributor.authorBell, A. F.en
dc.contributor.authorMain, I. G.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptUCL,UK-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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