The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection
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 ou...
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ftconicet:oai:ri.conicet.gov.ar:11336/97535 2023-10-09T21:47:15+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 Javier Ghiglione, Matias Calderón, Mauricio Sue, Christian Martinod, Joseph Guillaume, Benjamin Rojo, Diego application/pdf http://hdl.handle.net/11336/97535 eng eng Pergamon-Elsevier Science Ltd info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981118303377 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2018.12.015 http://hdl.handle.net/11336/97535 Suárez, Rodrigo Javier; Ghiglione, Matias; Calderón, Mauricio; Sue, Christian; Martinod, Joseph; et al.; The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 90; 3-2019; 471-486 0895-9811 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ ANTARCTIC PENINSULA DETRITAL ZIRCONS AGES NUNATAK VIEDMA SOUTHERN PATAGONIAN ANDES SOUTHWESTERN GONDWANA VERY-LOW GRADE METAMORPHIC ROCKS https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.jsames.2018.12.015 2023-09-24T19:15:32Z 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 time when was still attached to southern Patagonia during the Triassic. The dynamics of the early Mesozoic orogen is also discussed. 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 Fil: ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic The Antarctic Antarctic Peninsula Patagonia Argentina Pablo ENVELOPE(-63.717,-63.717,-64.283,-64.283) Journal of South American Earth Sciences 90 471 486 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
ANTARCTIC PENINSULA DETRITAL ZIRCONS AGES NUNATAK VIEDMA SOUTHERN PATAGONIAN ANDES SOUTHWESTERN GONDWANA VERY-LOW GRADE METAMORPHIC ROCKS https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
ANTARCTIC PENINSULA DETRITAL ZIRCONS AGES NUNATAK VIEDMA SOUTHERN PATAGONIAN ANDES SOUTHWESTERN GONDWANA VERY-LOW GRADE METAMORPHIC ROCKS https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Suárez, Rodrigo Javier 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 DETRITAL ZIRCONS AGES NUNATAK VIEDMA SOUTHERN PATAGONIAN ANDES SOUTHWESTERN GONDWANA VERY-LOW GRADE METAMORPHIC ROCKS https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
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 time when was still attached to southern Patagonia during the Triassic. The dynamics of the early Mesozoic orogen is also discussed. 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 Fil: ... |
format |
Article in Journal/Newspaper |
author |
Suárez, Rodrigo Javier Ghiglione, Matias Calderón, Mauricio Sue, Christian Martinod, Joseph Guillaume, Benjamin Rojo, Diego |
author_facet |
Suárez, Rodrigo Javier Ghiglione, Matias Calderón, Mauricio Sue, Christian Martinod, Joseph Guillaume, Benjamin Rojo, Diego |
author_sort |
Suárez, Rodrigo Javier |
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 |
Pergamon-Elsevier Science Ltd |
url |
http://hdl.handle.net/11336/97535 |
long_lat |
ENVELOPE(-63.717,-63.717,-64.283,-64.283) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Patagonia Argentina Pablo |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Patagonia Argentina Pablo |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981118303377 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2018.12.015 http://hdl.handle.net/11336/97535 Suárez, Rodrigo Javier; Ghiglione, Matias; Calderón, Mauricio; Sue, Christian; Martinod, Joseph; et al.; The metamorphic rocks of the Nunatak Viedma in the Southern Patagonian Andes: Provenance sources and implications for the early Mesozoic Patagonia-Antarctic Peninsula connection; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 90; 3-2019; 471-486 0895-9811 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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_ |
1779310240634765312 |