dc.creatorGulbranson, Erik L.
dc.creatorCiccioli, Patricia Lucia
dc.creatorMontañez, Isabel P.
dc.creatorMarenssi, Sergio Alfredo
dc.creatorLimarino, Carlos Oscar
dc.creatorSchmitz, M. D.
dc.creatorDavydov, V.
dc.date.accessioned2017-07-10T21:37:10Z
dc.date.accessioned2018-11-06T13:34:37Z
dc.date.available2017-07-10T21:37:10Z
dc.date.available2018-11-06T13:34:37Z
dc.date.created2017-07-10T21:37:10Z
dc.date.issued2015-08
dc.identifierGulbranson, Erik L.; Ciccioli, Patricia Lucia; Montañez, Isabel P.; Marenssi, Sergio Alfredo; Limarino, Carlos Oscar; et al.; Paleoenvironments and age of the Talampaya Formation: The Permo-Triassic boundary in northwestern Argentina; Elsevier; Journal of South American Earth Sciences; 63; 8-2015; 310-322
dc.identifier0895-9811
dc.identifierhttp://hdl.handle.net/11336/20070
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1877045
dc.description.abstractThe Talampaya Formation is the basal unit of the Ischigualasto-Villa Unión rift system and has been traditionally assigned to the Triassic based on stratigraphic relationships. A median U–Pb age of 252.38 (+0.09/−0.22) Ma was obtained from volcanic zircons collected from a tuff bed close to the top of this unit at the Bordo Atravesado locality in the Cuesta de Miranda area (La Rioja, Argentina). This radiometric age is very close to the accepted Permian–Triassic boundary indicating that, at least in this locality, sedimentation occurred during the Late Permian but may have extended into the earliest Triassic. This new evidence indicates that the onset of the extensional event that gave rise to the rift basins in western Argentina started during the Permian. Detailed sedimentological studies of the 260 m thick Talampaya Formation allowed subdividing the succession into seven facies associations grouped into three evolutionary stages indicating that sedimentary environments initially evolved from alluvial fans to a braided river system. Subsequent intrabasinal volcanism associated with sediment deposition by low-to moderate-sinuosity rivers is recorded in the lower third of the column. The middle and upper part of the unit captures the evolution from ephemeral fluvial systems with an eolian interval to an ephemeral clastic lake with intermittent volcanic ash deposits. These changes indicate a progressive lowering of the landscape and a transition towards arid or semiarid conditions.
dc.languageeng
dc.publisherElsevier
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2015.08.008
dc.relationinfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0895981115300456
dc.rightshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectTALAMPAYA Fm.
dc.subjectLATE PERMIAN
dc.subjectPALEOENVIRONMENTS
dc.subjectPALEOCLIMATE
dc.titlePaleoenvironments and age of the Talampaya Formation: The Permo-Triassic boundary in northwestern Argentina
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.typeArtículos de revistas


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