Zircon O- and Hf-isotope constraints on the genesis and tectonic significance of Permian magmatism in Patagonia
The genesis of Permian magmatism in southern South America is actively debated, particularly in relation to the origin of Patagonia. U–Pb zircon ages of c . 255 Ma for igneous rocks from the basement of Tierra del Fuego are the first evidence for southerly prolongation of this magmatism. Zircon in t...
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ftdatacite:10.6084/m9.figshare.c.3768710 2023-05-15T14:01:25+02:00 Zircon O- and Hf-isotope constraints on the genesis and tectonic significance of Permian magmatism in Patagonia Castillo, Paula C. Mark Fanning Pankhurst, Robert J. Hervé, Francisco Rapela, Carlos W. 2017 https://dx.doi.org/10.6084/m9.figshare.c.3768710 https://figshare.com/collections/Zircon_O-_and_Hf-isotope_constraints_on_the_genesis_and_tectonic_significance_of_Permian_magmatism_in_Patagonia/3768710 unknown Figshare https://dx.doi.org/10.1144/jgs2016-152 CC BY https://creativecommons.org/licenses/by/4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2017 ftdatacite https://doi.org/10.6084/m9.figshare.c.3768710 https://doi.org/10.1144/jgs2016-152 2021-11-05T12:55:41Z The genesis of Permian magmatism in southern South America is actively debated, particularly in relation to the origin of Patagonia. U–Pb zircon ages of c . 255 Ma for igneous rocks from the basement of Tierra del Fuego are the first evidence for southerly prolongation of this magmatism. Zircon in these rocks has εHf t values 7.4‰, indicating recycling of Cambrian rocks. Permian granites in the north of the North Patagonian Massif record mantle-like δ 18 O magmatic input at c . 280 and 255 Ma, but reworking of upper crust between these two events, paralleling the recognized deformational history. In northwestern Patagonia, Early Permian granitic rocks have zircon with εHf t values ranging from +0.1 to –7.2, and δ 18 O > 6.2‰, suggesting continuity of the Permian magmatic belt along the western margin of South America farther north. Comparison with a sample from the Sierra de la Ventana suggests melting of similar crust on both sides of the Patagonia–South American hypothetical suture. These features, together with other geological considerations, are consistent with an autochthonous or parautochthonous origin of northern Patagonia and connection between southern Patagonia and the Antarctic Peninsula in late Palaeozoic time. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Tierra del Fuego DataCite Metadata Store (German National Library of Science and Technology) Antarctic Antarctic Peninsula Patagonia The Antarctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Castillo, Paula C. Mark Fanning Pankhurst, Robert J. Hervé, Francisco Rapela, Carlos W. Zircon O- and Hf-isotope constraints on the genesis and tectonic significance of Permian magmatism in Patagonia |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
The genesis of Permian magmatism in southern South America is actively debated, particularly in relation to the origin of Patagonia. U–Pb zircon ages of c . 255 Ma for igneous rocks from the basement of Tierra del Fuego are the first evidence for southerly prolongation of this magmatism. Zircon in these rocks has εHf t values 7.4‰, indicating recycling of Cambrian rocks. Permian granites in the north of the North Patagonian Massif record mantle-like δ 18 O magmatic input at c . 280 and 255 Ma, but reworking of upper crust between these two events, paralleling the recognized deformational history. In northwestern Patagonia, Early Permian granitic rocks have zircon with εHf t values ranging from +0.1 to –7.2, and δ 18 O > 6.2‰, suggesting continuity of the Permian magmatic belt along the western margin of South America farther north. Comparison with a sample from the Sierra de la Ventana suggests melting of similar crust on both sides of the Patagonia–South American hypothetical suture. These features, together with other geological considerations, are consistent with an autochthonous or parautochthonous origin of northern Patagonia and connection between southern Patagonia and the Antarctic Peninsula in late Palaeozoic time. |
format |
Article in Journal/Newspaper |
author |
Castillo, Paula C. Mark Fanning Pankhurst, Robert J. Hervé, Francisco Rapela, Carlos W. |
author_facet |
Castillo, Paula C. Mark Fanning Pankhurst, Robert J. Hervé, Francisco Rapela, Carlos W. |
author_sort |
Castillo, Paula |
title |
Zircon O- and Hf-isotope constraints on the genesis and tectonic significance of Permian magmatism in Patagonia |
title_short |
Zircon O- and Hf-isotope constraints on the genesis and tectonic significance of Permian magmatism in Patagonia |
title_full |
Zircon O- and Hf-isotope constraints on the genesis and tectonic significance of Permian magmatism in Patagonia |
title_fullStr |
Zircon O- and Hf-isotope constraints on the genesis and tectonic significance of Permian magmatism in Patagonia |
title_full_unstemmed |
Zircon O- and Hf-isotope constraints on the genesis and tectonic significance of Permian magmatism in Patagonia |
title_sort |
zircon o- and hf-isotope constraints on the genesis and tectonic significance of permian magmatism in patagonia |
publisher |
Figshare |
publishDate |
2017 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3768710 https://figshare.com/collections/Zircon_O-_and_Hf-isotope_constraints_on_the_genesis_and_tectonic_significance_of_Permian_magmatism_in_Patagonia/3768710 |
geographic |
Antarctic Antarctic Peninsula Patagonia The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Patagonia The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Tierra del Fuego |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Tierra del Fuego |
op_relation |
https://dx.doi.org/10.1144/jgs2016-152 |
op_rights |
CC BY https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3768710 https://doi.org/10.1144/jgs2016-152 |
_version_ |
1766271230733713408 |