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dc.contributor.author
Ort, M. H.
dc.contributor.author
Newkirk, T.
dc.contributor.author
Vilas, Juan Francisco A.
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dc.contributor.author
Vazquez, J. A.
dc.date.available
2019-07-02T19:26:42Z
dc.date.issued
2014-01
dc.identifier.citation
Ort, M. H.; Newkirk, T.; Vilas, Juan Francisco A.; Vazquez, J. A.; Towards the definition of AMS facies in the deposits of pyroclastic density currents; Geological Society of London; Geological Society of London Special Publication; 396; 1-2014; 205-226
dc.identifier.issn
0305-8719
dc.identifier.uri
http://hdl.handle.net/11336/79036
dc.description.abstract
Anisotropy of magnetic susceptibility (AMS) provides a statistically robust technique to characterize the fabrics of deposits of pyroclastic density currents (PDCs). AMS fabrics in two types of pyroclastic deposits (small-volume phreatomagmatic currents in the Hopi Buttes volcanic field, Arizona, USA, and large-volume caldera-forming currents, Caviahue Caldera, Neuquén, Argentina) show similar patterns. Near the vent and in areas of high topographical roughness, AMS depositional fabrics are poorly grouped, with weak lineations and foliations. In a densely welded proximal ignimbrite, this fabric is overprinted by a foliation formed as the rock compacted and deformed. Medial deposits have moderate-strong AMS lineations and foliations. The most distal deposits have strong foliations but weak lineations. Based on these facies and existing models for pyroclastic density currents, deposition in the medial areas occurs from the strongly sheared, high-particle-concentration base of a density-stratified current. In proximal areas and where topography mixes this denser base upwards into the current, deposition occurs rapidly from a current with little uniformity to the shear, in which particles fall and collide in a chaotic fashion. Distal deposits are emplaced by a slowing or stalled current so that the dominant particle motion is vertical, leading to weak lineation and strong foliation.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Geological Society of London
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Pyroclastics
dc.subject
Ams
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Patagonia
dc.subject
Volcanology
dc.subject.classification
Vulcanología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Towards the definition of AMS facies in the deposits of pyroclastic density currents
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-06-03T19:34:32Z
dc.journal.volume
396
dc.journal.pagination
205-226
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Ort, M. H.. Northern Arizona University; Estados Unidos
dc.description.fil
Fil: Newkirk, T.. University of British Columbia; Canadá
dc.description.fil
Fil: Vilas, Juan Francisco A.. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
dc.description.fil
Fil: Vazquez, J. A.. United States Geological Survey; Estados Unidos
dc.journal.title
Geological Society of London Special Publication
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1144/SP396.8
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://sp.lyellcollection.org/content/396/1/205.short
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