Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/4382
DC Field | Value | Language |
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dc.contributor.authorall | Collettini, C.; Dipartimento di Scienze della Terra, Universita` di Perugia, Piazza dell’Universita` 1, 06100 Perugia, Italy | en |
dc.contributor.authorall | Cardellini, C.; Dipartimento di Scienze della Terra, Universita` di Perugia, Piazza dell’Universita 1, 06100 Perugia | en |
dc.contributor.authorall | Chiodini, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.contributor.authorall | De Paola, N.; 1Dipartimento di Scienze della Terra, Universita` di Perugia, Piazza dell’Universita1, 06100 Perugia | en |
dc.contributor.authorall | Holdsworth, R. E.; Reactivation Research Group, Department of Earth Sciences, University of Durham, Durham DH1 3LE, UK | en |
dc.contributor.authorall | Smith, S. A. F.; Reactivation Research Group, Department of Earth Sciences, University of Durham, Durham DH1 3LE, UK | en |
dc.date.accessioned | 2008-12-01T08:02:48Z | en |
dc.date.available | 2008-12-01T08:02:48Z | en |
dc.date.issued | 2008 | en |
dc.identifier.uri | http://hdl.handle.net/2122/4382 | en |
dc.description.abstract | The influx of fluids into fault zones can trigger two main types of weakening process that operate over different timescales and facilitate fault movement and earthquake nucleation. Short- and long-term weakening mechanisms along faults require a continuous fluid supply near the base of the brittle crust, a condition satisfied in the extended/extending area of the Northern Apennines of Italy. Here carbon mass balance calculations, coupling aquifer geochemistry to isotopic and hydrological data, define the presence of a large flux (c. 12 160 t/day) of deep-seated CO2 centred in the extended sector of the area. In the currently active extending area, CO2 fluid overpressures at 85% of the lithostatic load have been documented in two deep (4–5 km) boreholes. In the long-term, field studies on an exhumed regional low-angle normal fault show that, during the entire fault history, fluids reacted with fine-grained cataclasites in the fault core to produce aggregates of weak, phyllosilicate-rich fault rocks that deform by fluid assisted frictional–viscous creep at sub-Byerlee friction values (m , 0.3). In the short term, fluids can be stored in structural traps, such as beneath mature faults, and stratigraphical traps such as Triassic evaporites. Both examples preserve evidence for multiple episodes of hydrofracturing induced by short-term cycles of fluid pressure build-up and release. Geochemical data on the regional-scale CO2 degassing process can therefore be related to field observations on fluid rock interactions to provide new insights into the deformation processes responsible for active seismicity in the Northern Apennines | en |
dc.language.iso | English | en |
dc.publisher.name | Geological Society of London | en |
dc.relation.ispartof | Geological Society, London, Special Publications | en |
dc.relation.ispartofseries | /299 (2008) | en |
dc.subject | CO2 degassing | en |
dc.subject | Northern Apennines | en |
dc.title | Fault weakening due to CO2 degassing in the Northern Apennines: short- and long-term processes | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.description.pagenumber | 175-194 | en |
dc.subject.INGV | 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases | en |
dc.subject.INGV | 04. Solid Earth::04.02. Exploration geophysics::04.02.01. Geochemical exploration | en |
dc.identifier.doi | 10.1144/SP299.11 | en |
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dc.description.obiettivoSpecifico | 4.5. Degassamento naturale | en |
dc.description.journalType | N/A or not JCR | en |
dc.description.fulltext | reserved | en |
dc.contributor.author | Collettini, C. | en |
dc.contributor.author | Cardellini, C. | en |
dc.contributor.author | Chiodini, G. | en |
dc.contributor.author | De Paola, N. | en |
dc.contributor.author | Holdsworth, R. E. | en |
dc.contributor.author | Smith, S. A. F. | en |
dc.contributor.department | Dipartimento di Scienze della Terra, Universita` di Perugia, Piazza dell’Universita` 1, 06100 Perugia, Italy | en |
dc.contributor.department | Dipartimento di Scienze della Terra, Universita` di Perugia, Piazza dell’Universita 1, 06100 Perugia | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia | en |
dc.contributor.department | 1Dipartimento di Scienze della Terra, Universita` di Perugia, Piazza dell’Universita1, 06100 Perugia | en |
dc.contributor.department | Reactivation Research Group, Department of Earth Sciences, University of Durham, Durham DH1 3LE, UK | en |
dc.contributor.department | Reactivation Research Group, Department of Earth Sciences, University of Durham, Durham DH1 3LE, UK | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Università La Sapienza | - |
crisitem.author.dept | Dipartimento di fisica e Geologia di Perugia | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia | - |
crisitem.author.dept | Univ. Perugia, Italy | - |
crisitem.author.dept | University of Durham | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia | - |
crisitem.author.orcid | 0000-0002-0628-8055 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 03. Hydrosphere | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
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