Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization
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 extrapolatio...
Published in: | Journal of South American Earth Sciences |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier Science
|
Subjects: | |
Online Access: | http://hdl.handle.net/11336/147603 |
id |
ftconicet:oai:ri.conicet.gov.ar:11336/147603 |
---|---|
record_format |
openpolar |
spelling |
ftconicet:oai:ri.conicet.gov.ar:11336/147603 2023-10-09T21:47:14+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 D. Joseph, Philippe Valencia, Víctor A. Ramos, Victor Alberto application/pdf http://hdl.handle.net/11336/147603 eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0895981118305236 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2019.102253 http://hdl.handle.net/11336/147603 Lovecchio, Juan Pablo; Naipauer, Maximiliano; Cayo, Lubin Eric; Rohais, Sébastien; Giunta, David; et al.; Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization; Elsevier Science; Journal of South American Earth Sciences; 95; 11-2019; 1-18 0895-9811 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ GEOCHRONOLOGY JURASSIC MALVINAS RIFTING TOBÍFERA TRIASSIC 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.2019.102253 2023-09-24T18:46:51Z 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. Fil: Lovecchio, Juan Pablo. Yacimiento Petroliferos Fiscal S.a.; Argentina Fil: Naipauer, Maximiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de ... Article in Journal/Newspaper Antarc* Antarctica Weddell Sea CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Weddell Sea Austral Patagonia Weddell Argentina Pablo ENVELOPE(-63.717,-63.717,-64.283,-64.283) Journal of South American Earth Sciences 95 102253 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
GEOCHRONOLOGY JURASSIC MALVINAS RIFTING TOBÍFERA TRIASSIC https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
GEOCHRONOLOGY JURASSIC MALVINAS RIFTING TOBÍFERA TRIASSIC https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Lovecchio, Juan Pablo Naipauer, Maximiliano Cayo, Lubin Eric Rohais, Sébastien Giunta, David Flores, Gonzalo Gerster, Ricardo Bolatti, Néstor D. Joseph, Philippe Valencia, Víctor A. Ramos, Victor Alberto Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization |
topic_facet |
GEOCHRONOLOGY JURASSIC MALVINAS RIFTING TOBÍFERA TRIASSIC https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
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. Fil: Lovecchio, Juan Pablo. Yacimiento Petroliferos Fiscal S.a.; Argentina Fil: Naipauer, Maximiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de ... |
format |
Article in Journal/Newspaper |
author |
Lovecchio, Juan Pablo Naipauer, Maximiliano Cayo, Lubin Eric Rohais, Sébastien Giunta, David Flores, Gonzalo Gerster, Ricardo Bolatti, Néstor D. Joseph, Philippe Valencia, Víctor A. Ramos, Victor Alberto |
author_facet |
Lovecchio, Juan Pablo Naipauer, Maximiliano Cayo, Lubin Eric Rohais, Sébastien Giunta, David Flores, Gonzalo Gerster, Ricardo Bolatti, Néstor D. Joseph, Philippe Valencia, Víctor A. Ramos, Victor Alberto |
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 |
Elsevier Science |
url |
http://hdl.handle.net/11336/147603 |
long_lat |
ENVELOPE(-63.717,-63.717,-64.283,-64.283) |
geographic |
Weddell Sea Austral Patagonia Weddell Argentina Pablo |
geographic_facet |
Weddell Sea Austral Patagonia Weddell Argentina Pablo |
genre |
Antarc* Antarctica Weddell Sea |
genre_facet |
Antarc* Antarctica Weddell Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0895981118305236 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2019.102253 http://hdl.handle.net/11336/147603 Lovecchio, Juan Pablo; Naipauer, Maximiliano; Cayo, Lubin Eric; Rohais, Sébastien; Giunta, David; et al.; Rifting evolution of the Malvinas basin, offshore Argentina: New constrains from zircon U–Pb geochronology and seismic characterization; Elsevier Science; Journal of South American Earth Sciences; 95; 11-2019; 1-18 0895-9811 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/10.1016/j.jsames.2019.102253 |
container_title |
Journal of South American Earth Sciences |
container_volume |
95 |
container_start_page |
102253 |
_version_ |
1779310190032584704 |