The continental crust of northeastern patagonia
The basement of northeastern Patagonia is characterized by Early Paleozoic igneous and metamorphic rocks that do not crop out in the central, western and Andean sectors of the North Patagonian Massif. A review of U-Pb geochronology, geochemistry, and the Nd, Sr, Hf and O isotope signature of the ear...
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Language: | English |
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Asociación Paleontológica Argentina
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Online Access: | http://hdl.handle.net/11336/127094 |
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ftconicet:oai:ri.conicet.gov.ar:11336/127094 2023-10-09T21:56:26+02:00 The continental crust of northeastern patagonia La corteza continental del noreste de la patagonia Rapela, Carlos Washington Pankhurst, Robert application/pdf http://hdl.handle.net/11336/127094 eng eng Asociación Paleontológica Argentina info:eu-repo/semantics/altIdentifier/url/https://bioone.org/journals/ameghiniana/volume-57/issue-5/AMGH.17.01.2020.3270/The-Continental-Crust-of-Northeastern-Patagonia/10.5710/AMGH.17.01.2020.3270.short info:eu-repo/semantics/altIdentifier/doi/10.5710/AMGH.17.01.2020.3270 http://hdl.handle.net/11336/127094 Rapela, Carlos Washington; Pankhurst, Robert; The continental crust of northeastern patagonia; Asociación Paleontológica Argentina; Ameghiniana; 57; 5; 10-2020; 480-498 0002-7014 1851-8044 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ CONTINENTAL CRUST EARLY PALEOZOIC GONDWANA HF-O ISOTOPES NORTHEASTERN PATAGONIA U-PB PROVENANCE 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/10.5710/AMGH.17.01.2020.3270 2023-09-24T18:32:01Z The basement of northeastern Patagonia is characterized by Early Paleozoic igneous and metamorphic rocks that do not crop out in the central, western and Andean sectors of the North Patagonian Massif. A review of U-Pb geochronology, geochemistry, and the Nd, Sr, Hf and O isotope signature of the early Cambrian and early Ordovician magmatic rocks supports the hypothesis that the continental crust of northeastern Patagonia was essentially continuous with that of the Eastern Sierras Pampeanas in early Cambrian times. Mesoproterozoic lower crust is also inferred for this sector. New zircon Hf and O analyses of early Cambrian (Pampean) granites in the Sierras Pampeanas are indistinguishable from those of Cambrian granites in NE Patagonia, indicating an important crustal component in the source. The detrital zircon age patterns of the inferred basement are also similar in the two regions, strongly suggesting a southern Kalahari provenance. A modified hypothesis to explain the continuity of NE Patagonia with the Pampean belt of the Sierras Pampeanas during early Cambrian times, as well as their SW Gondwana geological affinity, is to consider this entire belt as an outboard sector of the mid-Cambrian rifting observed along the South America–South Africa–Weddell Sea margin. The detached sector would then have become juxtaposed against the Río de la Plata craton across the right-lateral Córdoba fault in late Cambrian times. Fil: Rapela, Carlos Washington. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina Fil: Pankhurst, Robert. British Geological Survey; Reino Unido Article in Journal/Newspaper Weddell Sea CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Weddell Sea Patagonia Weddell Argentina Ameghiniana 57 5 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
CONTINENTAL CRUST EARLY PALEOZOIC GONDWANA HF-O ISOTOPES NORTHEASTERN PATAGONIA U-PB PROVENANCE https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
CONTINENTAL CRUST EARLY PALEOZOIC GONDWANA HF-O ISOTOPES NORTHEASTERN PATAGONIA U-PB PROVENANCE https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Rapela, Carlos Washington Pankhurst, Robert The continental crust of northeastern patagonia |
topic_facet |
CONTINENTAL CRUST EARLY PALEOZOIC GONDWANA HF-O ISOTOPES NORTHEASTERN PATAGONIA U-PB PROVENANCE https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
The basement of northeastern Patagonia is characterized by Early Paleozoic igneous and metamorphic rocks that do not crop out in the central, western and Andean sectors of the North Patagonian Massif. A review of U-Pb geochronology, geochemistry, and the Nd, Sr, Hf and O isotope signature of the early Cambrian and early Ordovician magmatic rocks supports the hypothesis that the continental crust of northeastern Patagonia was essentially continuous with that of the Eastern Sierras Pampeanas in early Cambrian times. Mesoproterozoic lower crust is also inferred for this sector. New zircon Hf and O analyses of early Cambrian (Pampean) granites in the Sierras Pampeanas are indistinguishable from those of Cambrian granites in NE Patagonia, indicating an important crustal component in the source. The detrital zircon age patterns of the inferred basement are also similar in the two regions, strongly suggesting a southern Kalahari provenance. A modified hypothesis to explain the continuity of NE Patagonia with the Pampean belt of the Sierras Pampeanas during early Cambrian times, as well as their SW Gondwana geological affinity, is to consider this entire belt as an outboard sector of the mid-Cambrian rifting observed along the South America–South Africa–Weddell Sea margin. The detached sector would then have become juxtaposed against the Río de la Plata craton across the right-lateral Córdoba fault in late Cambrian times. Fil: Rapela, Carlos Washington. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina Fil: Pankhurst, Robert. British Geological Survey; Reino Unido |
format |
Article in Journal/Newspaper |
author |
Rapela, Carlos Washington Pankhurst, Robert |
author_facet |
Rapela, Carlos Washington Pankhurst, Robert |
author_sort |
Rapela, Carlos Washington |
title |
The continental crust of northeastern patagonia |
title_short |
The continental crust of northeastern patagonia |
title_full |
The continental crust of northeastern patagonia |
title_fullStr |
The continental crust of northeastern patagonia |
title_full_unstemmed |
The continental crust of northeastern patagonia |
title_sort |
continental crust of northeastern patagonia |
publisher |
Asociación Paleontológica Argentina |
url |
http://hdl.handle.net/11336/127094 |
geographic |
Weddell Sea Patagonia Weddell Argentina |
geographic_facet |
Weddell Sea Patagonia Weddell Argentina |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://bioone.org/journals/ameghiniana/volume-57/issue-5/AMGH.17.01.2020.3270/The-Continental-Crust-of-Northeastern-Patagonia/10.5710/AMGH.17.01.2020.3270.short info:eu-repo/semantics/altIdentifier/doi/10.5710/AMGH.17.01.2020.3270 http://hdl.handle.net/11336/127094 Rapela, Carlos Washington; Pankhurst, Robert; The continental crust of northeastern patagonia; Asociación Paleontológica Argentina; Ameghiniana; 57; 5; 10-2020; 480-498 0002-7014 1851-8044 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.5710/AMGH.17.01.2020.3270 |
container_title |
Ameghiniana |
container_volume |
57 |
container_issue |
5 |
_version_ |
1779321144869912576 |