Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield
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 unkno...
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ftconicet:oai:ri.conicet.gov.ar:11336/193876 2023-10-09T21:46:07+02:00 Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield Suárez, Rodrigo Javier Ghiglione, Matias Calderón, Mauricio Sue, Christian Martinod, Joseph Internacional application/pdf http://hdl.handle.net/11336/193876 eng eng Universidad de Concepción info:eu-repo/semantics/altIdentifier/url/https://congresogeologicochileno.cl/wp-content/uploads/2018/12/Libro-de-Actas-XVCongresoGeologicoChileno2018-2.pdf http://hdl.handle.net/11336/193876 Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield; XV Congreso Geológico Chileno; Concepción; Chile; 2018; 1-1507 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Detrital zircon ages Nunatak Viedma Late Triassic Chonide orogenic event https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/conferenceObject info:ar-repo/semantics/documento de conferencia Congreso Book ftconicet 2023-09-24T19:16:54Z 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. Fil: Suárez, Rodrigo Javier. Consejo Nacional de ... Book Antarc* Antarctic Antarctic Peninsula Tierra del Fuego CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic The Antarctic Antarctic Peninsula Patagonia |
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Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Detrital zircon ages Nunatak Viedma Late Triassic Chonide orogenic event https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
Detrital zircon ages Nunatak Viedma Late Triassic Chonide orogenic event https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Suárez, Rodrigo Javier Ghiglione, Matias Calderón, Mauricio Sue, Christian Martinod, Joseph Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield |
topic_facet |
Detrital zircon ages Nunatak Viedma Late Triassic Chonide orogenic event https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
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. Fil: Suárez, Rodrigo Javier. Consejo Nacional de ... |
format |
Book |
author |
Suárez, Rodrigo Javier Ghiglione, Matias Calderón, Mauricio Sue, Christian Martinod, Joseph |
author_facet |
Suárez, Rodrigo Javier Ghiglione, Matias Calderón, Mauricio Sue, Christian Martinod, Joseph |
author_sort |
Suárez, Rodrigo Javier |
title |
Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield |
title_short |
Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield |
title_full |
Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield |
title_fullStr |
Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield |
title_full_unstemmed |
Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield |
title_sort |
late triassic detrital zircon ages from the nunatak viedma on the southern patagonian icefield |
publisher |
Universidad de Concepción |
url |
http://hdl.handle.net/11336/193876 |
op_coverage |
Internacional |
geographic |
Antarctic The Antarctic Antarctic Peninsula Patagonia |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Patagonia |
genre |
Antarc* Antarctic Antarctic Peninsula Tierra del Fuego |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Tierra del Fuego |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://congresogeologicochileno.cl/wp-content/uploads/2018/12/Libro-de-Actas-XVCongresoGeologicoChileno2018-2.pdf http://hdl.handle.net/11336/193876 Late triassic detrital zircon ages from the nunatak Viedma on the southern patagonian icefield; XV Congreso Geológico Chileno; Concepción; Chile; 2018; 1-1507 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
_version_ |
1779321766016974848 |