The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection
International audience The Nunatak Viedma within the Southern Patagonian Icefield has been considered as a volcanic center based on its geomorphologic features, despite the fact that field explorations by Eric Shipton determined its metamorphic nature 70 years ago. We carried out fieldwork to charac...
Published in: | Journal of South American Earth Sciences |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2019
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Subjects: | |
Online Access: | https://hal-insu.archives-ouvertes.fr/insu-01968876 https://hal-insu.archives-ouvertes.fr/insu-01968876/document https://hal-insu.archives-ouvertes.fr/insu-01968876/file/suarez-2019.pdf https://doi.org/10.1016/j.jsames.2018.12.015 |
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ftunivnantes:oai:HAL:insu-01968876v1 |
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institution |
Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Antarctic Peninsula Southwestern Gondwana Southern Patagonian Andes Nunatak Viedma Very-low grade metamorphic rocks Detrital zircons ages [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Antarctic Peninsula Southwestern Gondwana Southern Patagonian Andes Nunatak Viedma Very-low grade metamorphic rocks Detrital zircons ages [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Suárez, Rodrigo, Ghiglione, Matias, Calderón, Mauricio Sue, Christian Martinod, Joseph Guillaume, Benjamin Rojo, Diego The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection |
topic_facet |
Antarctic Peninsula Southwestern Gondwana Southern Patagonian Andes Nunatak Viedma Very-low grade metamorphic rocks Detrital zircons ages [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The Nunatak Viedma within the Southern Patagonian Icefield has been considered as a volcanic center based on its geomorphologic features, despite the fact that field explorations by Eric Shipton determined its metamorphic nature 70 years ago. We carried out fieldwork to characterize this isolated outcrop and performed the first U-Pb dating in detrital zircons from the basement rocks located inside the Southern Patagonian Icefield. We recognized very-low grade metamorphic rocks, corresponding principally to metapelites and metapsammites, and scarce metabasites. Detrital zircons in three metapsammitic samples (composite group of 240 grains) yielded prominent age population peaks at ∼1090, ∼960, ∼630, ∼520, ∼480–460, ∼380, ∼290–260, ∼235-225 Ma that are typical of Gondwanide affinity, and youngest grains at ∼208 Ma. Maximum depositional ages of 225, 223 and 212 Ma were calculated for each sample from the youngest cluster of ages. This distinctive and novelty Late Triassic age justifies differentiate the Nunatak Viedma Unit from the Devonian-early Carboniferous and Permian-Early Triassic (?) belts of the Eastern Andean Metamorphic Complex. Possible primary source areas for the detrital zircons are outcropping in southern Patagonia, the Antarctic Peninsula, and the Malvinas Islands. Additionally, secondary sources could be part of the erosion and recycling of metasediments from the Eastern Andean Metamorphic Complex. We propose that the cluster of Triassic ages is related to the volcanic arc emplaced along the Antarctic Peninsula and active at that timewhen was still attached to southern Patagonia during the Triassic. The dynamics of the early Mesozoic orogen is also discussed. |
author2 |
Universidad de Buenos Aires Buenos Aires (UBA) Universidad Andrés Bello Santiago (UNAB) Laboratoire Chrono-environnement (UMR 6249) (LCE) Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC) Géosciences Rennes (GR) Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) Universidad Arturo Prat (UNAP) PIP 2014–2016, CONICET PICT-2013-1291, projects Agencia A15U02, Argentinian-French ECOS-SUD project 1161818, Proyecto FONDECYT |
format |
Article in Journal/Newspaper |
author |
Suárez, Rodrigo, Ghiglione, Matias, Calderón, Mauricio Sue, Christian Martinod, Joseph Guillaume, Benjamin Rojo, Diego |
author_facet |
Suárez, Rodrigo, Ghiglione, Matias, Calderón, Mauricio Sue, Christian Martinod, Joseph Guillaume, Benjamin Rojo, Diego |
author_sort |
Suárez, Rodrigo, |
title |
The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection |
title_short |
The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection |
title_full |
The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection |
title_fullStr |
The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection |
title_full_unstemmed |
The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection |
title_sort |
metamorphic rocks of the nunatak viedma in the southern patagonian andes: provenance sources and implications for the early mesozoic patagonia-antarctic peninsula connection |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01968876 https://hal-insu.archives-ouvertes.fr/insu-01968876/document https://hal-insu.archives-ouvertes.fr/insu-01968876/file/suarez-2019.pdf https://doi.org/10.1016/j.jsames.2018.12.015 |
geographic |
Antarctic Antarctic Peninsula Patagonia The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Patagonia The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
ISSN: 0895-9811 Journal of South American Earth Sciences https://hal-insu.archives-ouvertes.fr/insu-01968876 Journal of South American Earth Sciences, 2019, 90, pp.471-486. ⟨10.1016/j.jsames.2018.12.015⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2018.12.015 insu-01968876 https://hal-insu.archives-ouvertes.fr/insu-01968876 https://hal-insu.archives-ouvertes.fr/insu-01968876/document https://hal-insu.archives-ouvertes.fr/insu-01968876/file/suarez-2019.pdf doi:10.1016/j.jsames.2018.12.015 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.jsames.2018.12.015 |
container_title |
Journal of South American Earth Sciences |
container_volume |
90 |
container_start_page |
471 |
op_container_end_page |
486 |
_version_ |
1766028475057045504 |
spelling |
ftunivnantes:oai:HAL:insu-01968876v1 2023-05-15T13:32:35+02:00 The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection Suárez, Rodrigo, Ghiglione, Matias, Calderón, Mauricio Sue, Christian Martinod, Joseph Guillaume, Benjamin Rojo, Diego Universidad de Buenos Aires Buenos Aires (UBA) Universidad Andrés Bello Santiago (UNAB) Laboratoire Chrono-environnement (UMR 6249) (LCE) Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC) Géosciences Rennes (GR) Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) Universidad Arturo Prat (UNAP) PIP 2014–2016, CONICET PICT-2013-1291, projects Agencia A15U02, Argentinian-French ECOS-SUD project 1161818, Proyecto FONDECYT 2019-03 https://hal-insu.archives-ouvertes.fr/insu-01968876 https://hal-insu.archives-ouvertes.fr/insu-01968876/document https://hal-insu.archives-ouvertes.fr/insu-01968876/file/suarez-2019.pdf https://doi.org/10.1016/j.jsames.2018.12.015 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2018.12.015 insu-01968876 https://hal-insu.archives-ouvertes.fr/insu-01968876 https://hal-insu.archives-ouvertes.fr/insu-01968876/document https://hal-insu.archives-ouvertes.fr/insu-01968876/file/suarez-2019.pdf doi:10.1016/j.jsames.2018.12.015 info:eu-repo/semantics/OpenAccess ISSN: 0895-9811 Journal of South American Earth Sciences https://hal-insu.archives-ouvertes.fr/insu-01968876 Journal of South American Earth Sciences, 2019, 90, pp.471-486. ⟨10.1016/j.jsames.2018.12.015⟩ Antarctic Peninsula Southwestern Gondwana Southern Patagonian Andes Nunatak Viedma Very-low grade metamorphic rocks Detrital zircons ages [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2019 ftunivnantes https://doi.org/10.1016/j.jsames.2018.12.015 2023-01-18T01:00:29Z International audience The Nunatak Viedma within the Southern Patagonian Icefield has been considered as a volcanic center based on its geomorphologic features, despite the fact that field explorations by Eric Shipton determined its metamorphic nature 70 years ago. We carried out fieldwork to characterize this isolated outcrop and performed the first U-Pb dating in detrital zircons from the basement rocks located inside the Southern Patagonian Icefield. We recognized very-low grade metamorphic rocks, corresponding principally to metapelites and metapsammites, and scarce metabasites. Detrital zircons in three metapsammitic samples (composite group of 240 grains) yielded prominent age population peaks at ∼1090, ∼960, ∼630, ∼520, ∼480–460, ∼380, ∼290–260, ∼235-225 Ma that are typical of Gondwanide affinity, and youngest grains at ∼208 Ma. Maximum depositional ages of 225, 223 and 212 Ma were calculated for each sample from the youngest cluster of ages. This distinctive and novelty Late Triassic age justifies differentiate the Nunatak Viedma Unit from the Devonian-early Carboniferous and Permian-Early Triassic (?) belts of the Eastern Andean Metamorphic Complex. Possible primary source areas for the detrital zircons are outcropping in southern Patagonia, the Antarctic Peninsula, and the Malvinas Islands. Additionally, secondary sources could be part of the erosion and recycling of metasediments from the Eastern Andean Metamorphic Complex. We propose that the cluster of Triassic ages is related to the volcanic arc emplaced along the Antarctic Peninsula and active at that timewhen was still attached to southern Patagonia during the Triassic. The dynamics of the early Mesozoic orogen is also discussed. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Université de Nantes: HAL-UNIV-NANTES Antarctic Antarctic Peninsula Patagonia The Antarctic Journal of South American Earth Sciences 90 471 486 |