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dc.contributor.author
Wright, Heather M. N.
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Lesti, Chiara
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Cas, Raymond A. F.
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Porreca, Massimiliano
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Viramonte, Jose German
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Folkes, Chris B.
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Giordano, Guido
dc.date.available
2017-03-30T19:05:47Z
dc.date.issued
2011-09
dc.identifier.citation
Wright, Heather M. N.; Lesti, Chiara; Cas, Raymond A. F.; Porreca, Massimiliano; Viramonte, Jose German; et al.; Columnar jointing in vapor-phase-altered, non-welded Cerro Galán Ignimbrite, Paycuqui, Argentina; Springer Verlag Berlín; Bulletin Of Volcanology; 73; 10; 9-2011; 1567-1582
dc.identifier.issn
0258-8900
dc.identifier.uri
http://hdl.handle.net/11336/14542
dc.description.abstract
Columnar jointing is thought to occur primarily in lavas and welded pyroclastic flow deposits. However, the non-welded Cerro Galán Ignimbrite at Paycuqui, Argentina, contains well-developed columnar joints that are instead due to high-temperature vapor-phase alteration of the deposit, where devitrification and vapor-phase crystallization have increased the density and cohesion of the upper half of the section. Thermal remanent magnetization analyses of entrained lithic clasts indicate high emplacement temperatures, above 630°C, but the lack of welding textures indicates temperatures below the glass transition temperature. In order to remain below the glass transition at 630°C, the minimum cooling rate prior to deposition was 3.0 × 10−3–8.5 × 10−2°C/min (depending on the experimental data used for comparison). Alternatively, if the deposit was emplaced above the glass transition temperature, conductive cooling alone was insufficient to prevent welding. Crack patterns (average, 4.5 sides to each polygon) and column diameters (average, 75 cm) are consistent with relatively rapid cooling, where advective heat loss due to vapor fluxing increases cooling over simple conductive heat transfer. The presence of regularly spaced, complex radiating joint patterns is consistent with fumarolic gas rise, where volatiles originated in the valley-confined drainage system below. Joint spacing is a proxy for cooling rates and is controlled by depositional thickness/valley width. We suggest that the formation of joints in high-temperature, non-welded deposits is aided by the presence of underlying external water, where vapor transfer causes crystallization in pore spaces, densifies the deposit, and helps prevent welding.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer Verlag Berlín
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Pyroclastic Flow
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Columnar Joint
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Devitrification
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Vapor Phase
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Welding
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Ignimbrite
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Vulcanología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Columnar jointing in vapor-phase-altered, non-welded Cerro Galán Ignimbrite, Paycuqui, Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-03-29T14:45:30Z
dc.identifier.eissn
1432-0819
dc.journal.volume
73
dc.journal.number
10
dc.journal.pagination
1567-1582
dc.journal.pais
Alemania
dc.journal.ciudad
Berlin
dc.description.fil
Fil: Wright, Heather M. N.. Monash University; Australia
dc.description.fil
Fil: Lesti, Chiara. Università degli Studi di Roma Tre; Italia
dc.description.fil
Fil: Cas, Raymond A. F.. Monash University; Australia
dc.description.fil
Fil: Porreca, Massimiliano. Università degli Studi di Roma Tre; Italia
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Fil: Viramonte, Jose German. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Salta. Instituto de Investigaciones en Energía no Convencional; Argentina. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto Geonorte; Argentina
dc.description.fil
Fil: Folkes, Chris B.. Monash University; Australia
dc.description.fil
Fil: Giordano, Guido. Università degli Studi di Roma Tre; Italia
dc.journal.title
Bulletin Of Volcanology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s00445-011-0524-6
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info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00445-011-0524-6