Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization
International audience The Malvinas basin, emplaced offshore southern Patagonia, is an asymmetric extensional basin formed by NNW-striking faults. In this contribution we present a review and updated structural framework for the Malvinas basin, together with two new U–Pb zircon ages for the synrift...
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Online Access: | https://hal-ifp.archives-ouvertes.fr/hal-02397889 https://doi.org/10.1016/j.jsames.2019.102253 |
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ftccsdartic:oai:HAL:hal-02397889v1 2023-05-15T13:55:30+02:00 Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization Lovecchio, Juan Pablo Naipauer, Maximiliano Cayo, Lubin Eric Rohais, Sébastien Giunta, David Flores, Gonzalo Gerster, Ricardo Bolatti, Néstor Joseph, Philippe Valencia, Victor Ramos, Victor YPF S.A. Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET) IFP Energies nouvelles (IFPEN) Washington State University (WSU) 2019-11 https://hal-ifp.archives-ouvertes.fr/hal-02397889 https://doi.org/10.1016/j.jsames.2019.102253 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2019.102253 hal-02397889 https://hal-ifp.archives-ouvertes.fr/hal-02397889 doi:10.1016/j.jsames.2019.102253 ISSN: 0895-9811 Journal of South American Earth Sciences https://hal-ifp.archives-ouvertes.fr/hal-02397889 Journal of South American Earth Sciences, Elsevier, 2019, 95, pp.102253. ⟨10.1016/j.jsames.2019.102253⟩ Malvinas Rifting Geochronology Tobífera Jurassic Triassic [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.1016/j.jsames.2019.102253 2021-11-14T00:08:15Z International audience The Malvinas basin, emplaced offshore southern Patagonia, is an asymmetric extensional basin formed by NNW-striking faults. In this contribution we present a review and updated structural framework for the Malvinas basin, together with two new U–Pb zircon ages for the synrift series. By extrapolation from the neighboring Austral basin, the Middle Jurassic Serie Tobífera unit has typically been interpreted as the synrift infill of the Malvinas basin and correlated to the V2 event of the Chon Aike Magmatic Province. A tuff sample recovered from Serie Tobífera in a well in the Malvinas basin, confirmed this correlation and yielded a crystallization age of 169.6 ± 2 Ma (U–Pb in zircon). Furthermore, a volcanic breccia obtained from a deeper section within the synrift, yielded a Late Triassic age (215 Ma, U–Pb in zircon). This is the first Triassic age in the Malvinas basin and allowed correlation of these deposits with the El Tranquilo basin in the Deseado Massif (onshore Patagonia). The synextensional emplacement of the retroarc Chon Aike Magmatic Province is associated with trenchward migration of the coetaneous volcanic arc. To explain the rotational extension observed in the Chon Aike structural fabric at continental plate-scale, we follow the differential rollback model for the Jurassic evolution of southern Patagonia and introduce a vertical slab tear between Patagonia and Antarctica. The slab tear model provides a border condition for the differential rollback and explains the lateral displacement between Eastern and Western Gondwana during the Mozambique Channel opening. Moreover, the asthenospheric window opened by the slab tear would have produced a thermal anomaly that triggered the opening of the Weddell Sea in the Late Jurassic between Eastern and Western Gondwana. Article in Journal/Newspaper Antarc* Antarctica Weddell Sea Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Argentina Austral Patagonia Weddell Weddell Sea Journal of South American Earth Sciences 95 102253 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Malvinas Rifting Geochronology Tobífera Jurassic Triassic [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Malvinas Rifting Geochronology Tobífera Jurassic Triassic [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Lovecchio, Juan Pablo Naipauer, Maximiliano Cayo, Lubin Eric Rohais, Sébastien Giunta, David Flores, Gonzalo Gerster, Ricardo Bolatti, Néstor Joseph, Philippe Valencia, Victor Ramos, Victor Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization |
topic_facet |
Malvinas Rifting Geochronology Tobífera Jurassic Triassic [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The Malvinas basin, emplaced offshore southern Patagonia, is an asymmetric extensional basin formed by NNW-striking faults. In this contribution we present a review and updated structural framework for the Malvinas basin, together with two new U–Pb zircon ages for the synrift series. By extrapolation from the neighboring Austral basin, the Middle Jurassic Serie Tobífera unit has typically been interpreted as the synrift infill of the Malvinas basin and correlated to the V2 event of the Chon Aike Magmatic Province. A tuff sample recovered from Serie Tobífera in a well in the Malvinas basin, confirmed this correlation and yielded a crystallization age of 169.6 ± 2 Ma (U–Pb in zircon). Furthermore, a volcanic breccia obtained from a deeper section within the synrift, yielded a Late Triassic age (215 Ma, U–Pb in zircon). This is the first Triassic age in the Malvinas basin and allowed correlation of these deposits with the El Tranquilo basin in the Deseado Massif (onshore Patagonia). The synextensional emplacement of the retroarc Chon Aike Magmatic Province is associated with trenchward migration of the coetaneous volcanic arc. To explain the rotational extension observed in the Chon Aike structural fabric at continental plate-scale, we follow the differential rollback model for the Jurassic evolution of southern Patagonia and introduce a vertical slab tear between Patagonia and Antarctica. The slab tear model provides a border condition for the differential rollback and explains the lateral displacement between Eastern and Western Gondwana during the Mozambique Channel opening. Moreover, the asthenospheric window opened by the slab tear would have produced a thermal anomaly that triggered the opening of the Weddell Sea in the Late Jurassic between Eastern and Western Gondwana. |
author2 |
YPF S.A. Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET) IFP Energies nouvelles (IFPEN) Washington State University (WSU) |
format |
Article in Journal/Newspaper |
author |
Lovecchio, Juan Pablo Naipauer, Maximiliano Cayo, Lubin Eric Rohais, Sébastien Giunta, David Flores, Gonzalo Gerster, Ricardo Bolatti, Néstor Joseph, Philippe Valencia, Victor Ramos, Victor |
author_facet |
Lovecchio, Juan Pablo Naipauer, Maximiliano Cayo, Lubin Eric Rohais, Sébastien Giunta, David Flores, Gonzalo Gerster, Ricardo Bolatti, Néstor Joseph, Philippe Valencia, Victor Ramos, Victor |
author_sort |
Lovecchio, Juan Pablo |
title |
Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization |
title_short |
Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization |
title_full |
Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization |
title_fullStr |
Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization |
title_full_unstemmed |
Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization |
title_sort |
rifting evolution of the malvinas basin, offshore argentina: new constrains from zircon u–pb geochronology and seismic characterization |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal-ifp.archives-ouvertes.fr/hal-02397889 https://doi.org/10.1016/j.jsames.2019.102253 |
geographic |
Argentina Austral Patagonia Weddell Weddell Sea |
geographic_facet |
Argentina Austral Patagonia Weddell Weddell Sea |
genre |
Antarc* Antarctica Weddell Sea |
genre_facet |
Antarc* Antarctica Weddell Sea |
op_source |
ISSN: 0895-9811 Journal of South American Earth Sciences https://hal-ifp.archives-ouvertes.fr/hal-02397889 Journal of South American Earth Sciences, Elsevier, 2019, 95, pp.102253. ⟨10.1016/j.jsames.2019.102253⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2019.102253 hal-02397889 https://hal-ifp.archives-ouvertes.fr/hal-02397889 doi:10.1016/j.jsames.2019.102253 |
op_doi |
https://doi.org/10.1016/j.jsames.2019.102253 |
container_title |
Journal of South American Earth Sciences |
container_volume |
95 |
container_start_page |
102253 |
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1766262160863789056 |