Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5904
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dc.contributor.authorallMittempergher, S.; Padova Univ.en
dc.contributor.authorallPennacchioni, G.; Padova Univ.en
dc.contributor.authorallDi Toro, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.date.accessioned2010-02-10T09:16:12Zen
dc.date.available2010-02-10T09:16:12Zen
dc.date.issued2009en
dc.identifier.urihttp://hdl.handle.net/2122/5904en
dc.description.abstractThe factors controlling the development of different types of fault rock assemblages and, more specifically, the formation of friction melts are still not fully understood. In this study we compared two exhumed strike–slip faults in the Adamello batholith (Southern Alps): the Gole Larghe and the Passo Cercen fault zones, active at 9–11 km depth and temperatures of 250–300 C. Each fault zone consists of hundreds of sub-parallel strands exploiting pre-existing joints. The Gole Larghe fault strikes N105 5 and is dextral; the fault rocks are cataclasites and widespread, centimetre-thick pseudotachylytes. The Passo Cercen fault strikes on average N130 and is formed by multiple fault horizons: fault segments striking N105 –N130 are mainly dextral, whereas faults striking N135 –N140 are mainly sinistral. Microstructural, mineralogical and geochemical investigations show that the fault rocks are cataclasites associated with thick epidote þ K-feldspar þ quartz veins and rare, millimetre-thick pseudotachylytes. Field evidence suggests that in both fault zones, the direction of the maximum horizontal stress s1 was N135 . The Gole Larghe fault strikes at about 30 to s1 and is favourably oriented for reactivation. By contrast, the Passo Cercen fault strikes at low angles to s1 and is unfavourably oriented for reactivation, therefore requiring the development of high pore pressures, as suggested by the occurrence of extensive epidote veining and hydraulic breccias. It is proposed that frictional melting in the Passo Cercen fault zone was inhibited by the development of high pore pressures and low effective normal stresses.en
dc.language.isoEnglishen
dc.publisher.nameElsevieren
dc.relation.ispartofJournal of Structural Geologyen
dc.relation.ispartofseries/31 (2009)en
dc.subjectearthquakesen
dc.subjectpseudotachylytesen
dc.titleThe effects of fault orientation and fluid infiltration on fault rock assemblages at seismogenic depthsen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber1511-1524en
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneousen
dc.identifier.doi10.1016/j.jsg.2009.09.003en
dc.description.obiettivoSpecifico3.1. Fisica dei terremotien
dc.description.journalTypeJCR Journalen
dc.description.fulltextreserveden
dc.contributor.authorMittempergher, S.en
dc.contributor.authorPennacchioni, G.en
dc.contributor.authorDi Toro, G.en
dc.contributor.departmentPadova Univ.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.deptDipartimento di Geoscienze, Università di Padova, Padova, IT-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.orcid0000-0002-6618-3474-
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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