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dc.contributor.author
Spalletti, Luis Antonio
dc.contributor.author
Fanning, Christopher Mark
dc.contributor.author
Rapela, Carlos Washington
dc.date.available
2019-04-12T21:57:18Z
dc.date.issued
2008-09
dc.identifier.citation
Spalletti, Luis Antonio; Fanning, Christopher Mark; Rapela, Carlos Washington; Dating the Triassic continental rift in the southern Andes: the Potrerillos Formation, Cuyo Basin, Argentina; Universidad de Barcelona; Geologica Acta; 6; 3; 9-2008; 267-283
dc.identifier.issn
1695-6133
dc.identifier.uri
http://hdl.handle.net/11336/74327
dc.description.abstract
The Triassic successions of western Argentina commonly show thin pyroclastic levels intercalated within thick fluvial and lacustrine terrigenous deposits. The Potrerillos Formation is the thickest Triassic unit in the Cuyo Basin. It is composed of alternating cycles of gravelly- sandy- and muddy-dominated intervals, in which several laterally-continuous tuff horizons occur. U-Pb SHRIMP ages were determined on zircon grains from three tuff levels located between the lowermost and the middle sections of the Potrerillos Formation. The ages for the time of deposition of the tuffs are 239.2 ± 4.5 Ma, 239.7 ± 2.2 Ma and 230.3 ± 2.3 Ma (Middle Triassic). Chemical data indicate that these acid to intermediate volcaniclastic rocks are derived from coeval basic magmas displaying tholeiitic to slightly alkaline signatures. They are associated with the rift stage that followed the extensive post-orogenic volcanism of the Choiyoi Group, that in turn has been ascribed to slab break-off in neighbouring areas. Two of the studied samples also record a subpopulation of inherited zircon grains with crystallisation ages of 260-270 Ma. The latter are considered to be an indirect measurement for the age of the Choiyoi Group in the Cuyo basin. The rift-related Triassic event represents the culmination of the Gondwanian magmatic cycle, and is interpreted as the result of subduction cessation and anomalous heating of the upper mantle previous to the western Gondwana break-up.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Universidad de Barcelona
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Triassic
dc.subject
Cuyo Basin
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Argentina
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U-Pb Zircon Dating
dc.subject.classification
Geología
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Dating the Triassic continental rift in the southern Andes: the Potrerillos Formation, Cuyo Basin, 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
2019-03-26T20:35:43Z
dc.journal.volume
6
dc.journal.number
3
dc.journal.pagination
267-283
dc.journal.pais
España
dc.journal.ciudad
Barcelona
dc.description.fil
Fil: Spalletti, Luis Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.description.fil
Fil: Fanning, Christopher Mark. Research School of Earth Sciences, The Australian National University, Canberra; Australia
dc.description.fil
Fil: Rapela, Carlos Washington. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.journal.title
Geologica Acta
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1344/105.000000256
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000256


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