Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9313
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dc.contributor.authorallSmith, S. A. F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallBistacchi, A.; Dipartimento di Scienze Geologiche e Geotecnologie, Università di Milano Bicocca, Piazza delle Scienza 4, 20126, Milan, Italyen
dc.contributor.authorallMitchell, T.; Department of Geosciences, Ruhr-Universität Bochum, 44780, Bochum, Germanyen
dc.contributor.authorallMittempergher, S.; Dipartimento di Geoscience, Università di Padova, Via G. Gradenigo 6, 35131, Padua, Italyen
dc.contributor.authorallDi Toro, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.date.accessioned2015-02-09T07:50:19Zen
dc.date.available2015-02-09T07:50:19Zen
dc.date.issued2013-04en
dc.identifier.urihttp://hdl.handle.net/2122/9313en
dc.description.abstractThe 600 m-thick Gole Larghe Fault Zone (GLFZ) is hosted in jointed crystalline basement and exposed across glacier-polished outcrops in the Italian Alps. Ancient seismicity is attested by the widespread occurrence of cataclasites associated with pseudotachylytes (solidified frictional melts) formed at 9–11 km depth and ambient temperatures of 250–300 °C. Previous work focused on the southern part of the fault zone; here we quantitatively document fault zone structure across the full width of the GLFZ and surrounding tonalite host rocks by using a combination of structural line transects and image analysis of samples collected across fault strike. These new datasets indicate that the GLFZ has a broadly symmetric across-strike damage structure and contains distinct southern, central and northern zones distinguished by large variations in fracture density, distribution of pseudotachylytes, volume of fault rock materials, and microfracture sealing characteristics. The c. 100 m wide central zone is bound by two thick (~ 2 m) and laterally continuous (> 1 km) protocataclastic to ultracataclastic horizons. Within and immediately surrounding the central zone, fracture density is relatively high due to cataclastic fault–fracture networks that reworked earlier-formed pseudotachylytes. The fault–fracture networks were associated with pervasive microcracking and fluid–rock interaction, resulting in the development of a c. 200 m thick alteration zone delimited by lobate fluid infiltration fronts. In the c. 250 m thick southern and northern zones, fracture densities are much lower and pseudotachylytes systematically overprint cataclastic faults that exploited pre-existing magmatic cooling joints. Analysis of the structure of the GLFZ suggests that it shares certain characteristics with the seismogenic source responsible for the 2002 Au Sable Forks intraplate earthquake sequence in the northeastern USA, including seismicity distributed across a fault zone 500–1000 m thick and large (> 100 MPa) static stress drops associated with frictional melting.en
dc.language.isoEnglishen
dc.publisher.nameElsevier Science Limiteden
dc.relation.ispartofTectonophysicsen
dc.relation.ispartofseries1/599(2013)en
dc.subjectFault structureen
dc.subjectFluid flowen
dc.subjectFracture damageen
dc.subjectAlterationen
dc.subjectCataclasiteen
dc.subjectAdamelloen
dc.titleThe structure of an exhumed intraplate seismogenic fault in crystalline basementen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber29-44en
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismologyen
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.09. Structural geologyen
dc.identifier.doi10.1016/j.tecto.2013.03.031en
dc.description.obiettivoSpecifico4T. Fisica dei terremoti e scenari cosismicien
dc.description.journalTypeJCR Journalen
dc.description.fulltextreserveden
dc.relation.issn0040-1951en
dc.relation.eissn1879-3266en
dc.contributor.authorSmith, S. A. F.en
dc.contributor.authorBistacchi, A.en
dc.contributor.authorMitchell, T.en
dc.contributor.authorMittempergher, S.en
dc.contributor.authorDi Toro, G.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.departmentDipartimento di Scienze Geologiche e Geotecnologie, Università di Milano Bicocca, Piazza delle Scienza 4, 20126, Milan, Italyen
dc.contributor.departmentDepartment of Geosciences, Ruhr-Universität Bochum, 44780, Bochum, Germanyen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextreserved-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.deptDipartimento di Geologia e Geotecnologia, Università di Milano Bicocca, Milano, Italy-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.orcid0000-0002-0139-2785-
crisitem.author.orcid0000-0002-6618-3474-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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