Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage
We present a revised tectonic interpretation (from ∼28 Ma to 3.2 Ma) of the western sector of the Scotia Sea, incorporating new multichannel seismic reflection profiles and magnetic anomaly identifications for the continental margin off the Tierra del Fuego Island, and available complementary data f...
Published in: | Journal of Geophysical Research: Solid Earth |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
|
Subjects: | |
Online Access: | http://hdl.handle.net/11336/76195 |
id |
ftconicet:oai:ri.conicet.gov.ar:11336/76195 |
---|---|
record_format |
openpolar |
spelling |
ftconicet:oai:ri.conicet.gov.ar:11336/76195 2023-10-09T21:51:04+02:00 Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage Lodolo, Emanuele Donda, Federica Tassone, Alejandro Alberto application/pdf http://hdl.handle.net/11336/76195 eng eng American Geophysical Union Corrección: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2006JB004569 info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2006JB004361 info:eu-repo/semantics/altIdentifier/doi/10.1029/2006JB004361 http://hdl.handle.net/11336/76195 Lodolo, Emanuele; Donda, Federica; Tassone, Alejandro Alberto; Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage; American Geophysical Union; Journal of Geophysical Research: Solid Earth; 111; B6; 6-2006; 1-14 0148-0227 2169-9356 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ magnetic profile seismic data Drake Passage Western Scotia Sea 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/10.1029/2006JB004361 2023-09-24T19:32:26Z We present a revised tectonic interpretation (from ∼28 Ma to 3.2 Ma) of the western sector of the Scotia Sea, incorporating new multichannel seismic reflection profiles and magnetic anomaly identifications for the continental margin off the Tierra del Fuego Island, and available complementary data for the conjugate margin of the northwestern flank of the South Scotia Ridge. Seismic profiles show a remarkable diversity of the pair of conjugate passive margins of the western Scotia Sea in both their morphology and structural framework. The Tierra del Fuego continental margin can be related to a classic rifted passive margin, while the southwestern margin of the Scotia Sea is characterized by steep slopes mostly generated by subvertical faults that abruptly separate the continental crust of the South Scotia Ridge from the oceanic crust of the western Scotia Sea. This structural difference was caused by intense strike-slip tectonism, mostly concentrated along the modern South Scotia Ridge since the early development of the western Scotia Sea. We find evidence for a previously unrecognized magnetic anomaly 10 (∼28 Ma) at the foot of the Tierra del Fuego continental margin; the same anomaly is present at the conjugate northern flank of the South Scotia Ridge. The timing of events leading to the earliest development of the western Scotia Sea, which determined the opening of the Drake Passage is important because this gateway opening had a profound effect on global circulation and climate. The thickness and the distribution of the sedimentary cover overall in the abyssal plain off the two western Scotia Sea margins is different. This is due to the different regimes of the bottom-current flows which affected the western Scotia Sea, both in the past and in the present time. Fil: Lodolo, Emanuele. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale; Italia Fil: Donda, Federica. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale; Italia Fil: Tassone, Alejandro Alberto. Consejo Nacional de ... Article in Journal/Newspaper Drake Passage Scotia Sea Tierra del Fuego CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Drake Passage Scotia Sea South Scotia Ridge ENVELOPE(-46.500,-46.500,-60.000,-60.000) Journal of Geophysical Research: Solid Earth 111 B6 n/a n/a |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
magnetic profile seismic data Drake Passage Western Scotia Sea https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
magnetic profile seismic data Drake Passage Western Scotia Sea https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Lodolo, Emanuele Donda, Federica Tassone, Alejandro Alberto Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage |
topic_facet |
magnetic profile seismic data Drake Passage Western Scotia Sea https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
We present a revised tectonic interpretation (from ∼28 Ma to 3.2 Ma) of the western sector of the Scotia Sea, incorporating new multichannel seismic reflection profiles and magnetic anomaly identifications for the continental margin off the Tierra del Fuego Island, and available complementary data for the conjugate margin of the northwestern flank of the South Scotia Ridge. Seismic profiles show a remarkable diversity of the pair of conjugate passive margins of the western Scotia Sea in both their morphology and structural framework. The Tierra del Fuego continental margin can be related to a classic rifted passive margin, while the southwestern margin of the Scotia Sea is characterized by steep slopes mostly generated by subvertical faults that abruptly separate the continental crust of the South Scotia Ridge from the oceanic crust of the western Scotia Sea. This structural difference was caused by intense strike-slip tectonism, mostly concentrated along the modern South Scotia Ridge since the early development of the western Scotia Sea. We find evidence for a previously unrecognized magnetic anomaly 10 (∼28 Ma) at the foot of the Tierra del Fuego continental margin; the same anomaly is present at the conjugate northern flank of the South Scotia Ridge. The timing of events leading to the earliest development of the western Scotia Sea, which determined the opening of the Drake Passage is important because this gateway opening had a profound effect on global circulation and climate. The thickness and the distribution of the sedimentary cover overall in the abyssal plain off the two western Scotia Sea margins is different. This is due to the different regimes of the bottom-current flows which affected the western Scotia Sea, both in the past and in the present time. Fil: Lodolo, Emanuele. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale; Italia Fil: Donda, Federica. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale; Italia Fil: Tassone, Alejandro Alberto. Consejo Nacional de ... |
format |
Article in Journal/Newspaper |
author |
Lodolo, Emanuele Donda, Federica Tassone, Alejandro Alberto |
author_facet |
Lodolo, Emanuele Donda, Federica Tassone, Alejandro Alberto |
author_sort |
Lodolo, Emanuele |
title |
Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage |
title_short |
Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage |
title_full |
Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage |
title_fullStr |
Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage |
title_full_unstemmed |
Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage |
title_sort |
western scotia sea margins: improved constraints on the opening of the drake passage |
publisher |
American Geophysical Union |
url |
http://hdl.handle.net/11336/76195 |
long_lat |
ENVELOPE(-46.500,-46.500,-60.000,-60.000) |
geographic |
Drake Passage Scotia Sea South Scotia Ridge |
geographic_facet |
Drake Passage Scotia Sea South Scotia Ridge |
genre |
Drake Passage Scotia Sea Tierra del Fuego |
genre_facet |
Drake Passage Scotia Sea Tierra del Fuego |
op_relation |
Corrección: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2006JB004569 info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2006JB004361 info:eu-repo/semantics/altIdentifier/doi/10.1029/2006JB004361 http://hdl.handle.net/11336/76195 Lodolo, Emanuele; Donda, Federica; Tassone, Alejandro Alberto; Western Scotia Sea margins: Improved constraints on the opening of the Drake Passage; American Geophysical Union; Journal of Geophysical Research: Solid Earth; 111; B6; 6-2006; 1-14 0148-0227 2169-9356 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/10.1029/2006JB004361 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
111 |
container_issue |
B6 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1779314167266672640 |