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dc.contributor.author
Suárez, Rodrigo Javier
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Ghiglione, Matias
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Calderón, Mauricio
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Sue, Christian
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Martinod, Joseph
dc.date.available
2023-04-14T15:30:25Z
dc.date.issued
2018
dc.identifier.citation
Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield; XV Congreso Geológico Chileno; Concepción; Chile; 2018; 1-1507
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http://hdl.handle.net/11336/193876
dc.description.abstract
The Nunatak Viedma on the Southern Patagonian Icefield has been historically considered as a volcanic center based onmorphological evidence. Field explorations carried out at the summer of 1958-1959 by Eric Shipton determined its metamorphicsedimentarynature. However, the age of these rocks is unknown as well as its possible correlation with others metamorphiccomplexes that constitute the basement of southern Patagonia. In order to constrain the maximum depositional age of theprotoliths and to identify the provenance sources, three samples of metasedimentary rocks were taken from the southern outcropsof the Nunatak Viedma to analyze detrital zircons by LA-ICP-MS U-Pb method. The age distribution of detrital zircon grainsallowed identifying groups of Paleozoic-lower Mesozoic (65%), Proterozoic (34%) and isolated Archean ages (1%). The peaksof Paleozoic-early Mesozoic detrital ages define main groups in Lower Cambrian (~520 Ma), Lower-Middle Ordovician (~480-460 Ma), Upper Devonian (~380 Ma), Permian (~290-260 Ma) and Triassic (~235-225 Ma). Besides the maximum depositionalage was constrained at 220 Ma, which indicates that the deposition of the protoliths was active during the Late Triassic. Thesources areas for the detrital zircons are identified in the Malvinas Island, in the Deseado Massif, the erosion of the Eastern AndesMetamorphic Complex, the buried basement of Tierra del Fuego and outcrops in the Antarctic Peninsula. The cluster of Permian-Triassic ages may be related to the erosion of the volcanic arc emplaced along the western edge of Patagonia and AntarcticPeninsula, supporting the idea that Antarctic Peninsula was located in the southwestern edge of Southern Patagonia during thePermian-Triassic times. Despite the kind of basin in which the protoliths were deposited is unclear, the pattern of detrital zirconsallows us to infer a back-arc basin related to convergent settings as a possibly depositional environment, which is supported bythe petrography.
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application/pdf
dc.language.iso
eng
dc.publisher
Universidad de Concepción
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Detrital zircon ages
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Nunatak Viedma
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Late Triassic
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Chonide orogenic event
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Geología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield
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info:eu-repo/semantics/publishedVersion
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info:eu-repo/semantics/conferenceObject
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info:ar-repo/semantics/documento de conferencia
dc.date.updated
2023-02-27T16:00:53Z
dc.journal.pagination
1-1507
dc.journal.pais
Chile
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Concepción
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Fil: Suárez, Rodrigo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
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Fil: Ghiglione, Matias. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
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Fil: Calderón, Mauricio. Universidad Andrés Bello; Chile
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Fil: Sue, Christian. Universite de Franche-Comte; Francia
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Fil: Martinod, Joseph. Université de Savoie Mont-Blanc; Francia
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://congresogeologicochileno.cl/wp-content/uploads/2018/12/Libro-de-Actas-XVCongresoGeologicoChileno2018-2.pdf
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Autor
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Autor
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Autor
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Autor
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Autor
dc.coverage
Internacional
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Congreso
dc.description.nombreEvento
XV Congreso Geológico Chileno
dc.date.evento
2018-11-18
dc.description.ciudadEvento
Concepción
dc.description.paisEvento
Chile
dc.type.publicacion
Book
dc.description.institucionOrganizadora
Universidad de Concepción
dc.description.institucionOrganizadora
Colegio de Geólogos de Chile
dc.description.institucionOrganizadora
Sociedad Geológica de Chile
dc.source.libro
Libro de Actas: Geociencias hacia la comunidad
dc.date.eventoHasta
2018-11-23
dc.type
Congreso
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