Plate convergence west of Patagonia and the Antarctic Peninsula since 61 Ma
A new plate kinematic model portrays plate motions immediately west and south of Drake Passage in the southeast Pacific Ocean. Overall intermediate-to-slow rate spreading generated oceanic lithosphere as the Phoenix plate diverged from the Antarctic plate. The model shows a history of Phoenix plate...
Published in: | Global and Planetary Change |
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ELSEVIER SCIENCE BV
2014
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Online Access: | https://epic.awi.de/id/eprint/44621/ https://epic.awi.de/id/eprint/44621/1/Eagles_Scott_2014.pdf https://doi.org/10.1016/j.gloplacha.2014.08.002 https://hdl.handle.net/10013/epic.50957 https://hdl.handle.net/10013/epic.50957.d001 |
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ftawi:oai:epic.awi.de:44621 2023-05-15T13:40:28+02:00 Plate convergence west of Patagonia and the Antarctic Peninsula since 61 Ma Eagles, Graeme Scott, Benjamin G.C. 2014 application/pdf https://epic.awi.de/id/eprint/44621/ https://epic.awi.de/id/eprint/44621/1/Eagles_Scott_2014.pdf https://doi.org/10.1016/j.gloplacha.2014.08.002 https://hdl.handle.net/10013/epic.50957 https://hdl.handle.net/10013/epic.50957.d001 unknown ELSEVIER SCIENCE BV https://epic.awi.de/id/eprint/44621/1/Eagles_Scott_2014.pdf https://hdl.handle.net/10013/epic.50957.d001 Eagles, G. orcid:0000-0001-5325-0810 and Scott, B. G. (2014) Plate convergence west of Patagonia and the Antarctic Peninsula since 61 Ma , Global and Planetary Change, 123 , pp. 189-198 . hdl:10013/epic.50957 EPIC3Global and Planetary Change, ELSEVIER SCIENCE BV, 123, pp. 189-198, ISSN: 0921-8181 Article isiRev 2014 ftawi https://doi.org/10.1016/j.gloplacha.2014.08.002 2021-12-24T15:42:58Z A new plate kinematic model portrays plate motions immediately west and south of Drake Passage in the southeast Pacific Ocean. Overall intermediate-to-slow rate spreading generated oceanic lithosphere as the Phoenix plate diverged from the Antarctic plate. The model shows a history of Phoenix plate motion that is interpretable as having been affected by a northeast-increasing gradient in the slab pull force since chron 18 (39 Ma), during which time newer, less dense lithosphere was subducting in the southwest than in the northeast. The model allows first calculations of Phoenix–Farallon (Nazca) plate motion parameters in the south Pacific plate circuit. Using these parameters, it is possible to show that the simplest assumptions about the ridge's segmentation, length and migration are consistent with existing suggestions of its location from consideration of slab window-related volcanism at sites in South America around 50 and 20 Ma. The parameters thus define ridge locations that can be used to define which plates were subducting beneath South America and the Magallanes and Antarctic plates, and when. We consider the relationships between the plate convergence rate, obliquity and the history of magmatism on the Antarctic Peninsula and at the North Patagonian batholith, showing that magmatic pulses can be related to accelerations in the plate convergence rate. Between these settings, Phoenix–South American plate motion was almost parallel to the Fuegian trench. Here, magmatism in Paleocene to early Miocene times must be related to the presence of a slab subducted beneath the region by the less oblique collision further north. Later magmatism can be related to migration of the Phoenix–Farallon ridge and Phoenix–Farallon– Antarctic triple junction into the area south of the Fuegian margin, which brought it into slow low-obliquity convergence with first Farallon and then Antarctic plate lithosphere. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Drake Passage Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Antarctic Peninsula Drake Passage Magallanes ENVELOPE(-62.933,-62.933,-64.883,-64.883) Pacific Patagonia The Antarctic Global and Planetary Change 123 189 198 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
A new plate kinematic model portrays plate motions immediately west and south of Drake Passage in the southeast Pacific Ocean. Overall intermediate-to-slow rate spreading generated oceanic lithosphere as the Phoenix plate diverged from the Antarctic plate. The model shows a history of Phoenix plate motion that is interpretable as having been affected by a northeast-increasing gradient in the slab pull force since chron 18 (39 Ma), during which time newer, less dense lithosphere was subducting in the southwest than in the northeast. The model allows first calculations of Phoenix–Farallon (Nazca) plate motion parameters in the south Pacific plate circuit. Using these parameters, it is possible to show that the simplest assumptions about the ridge's segmentation, length and migration are consistent with existing suggestions of its location from consideration of slab window-related volcanism at sites in South America around 50 and 20 Ma. The parameters thus define ridge locations that can be used to define which plates were subducting beneath South America and the Magallanes and Antarctic plates, and when. We consider the relationships between the plate convergence rate, obliquity and the history of magmatism on the Antarctic Peninsula and at the North Patagonian batholith, showing that magmatic pulses can be related to accelerations in the plate convergence rate. Between these settings, Phoenix–South American plate motion was almost parallel to the Fuegian trench. Here, magmatism in Paleocene to early Miocene times must be related to the presence of a slab subducted beneath the region by the less oblique collision further north. Later magmatism can be related to migration of the Phoenix–Farallon ridge and Phoenix–Farallon– Antarctic triple junction into the area south of the Fuegian margin, which brought it into slow low-obliquity convergence with first Farallon and then Antarctic plate lithosphere. |
format |
Article in Journal/Newspaper |
author |
Eagles, Graeme Scott, Benjamin G.C. |
spellingShingle |
Eagles, Graeme Scott, Benjamin G.C. Plate convergence west of Patagonia and the Antarctic Peninsula since 61 Ma |
author_facet |
Eagles, Graeme Scott, Benjamin G.C. |
author_sort |
Eagles, Graeme |
title |
Plate convergence west of Patagonia and the Antarctic Peninsula since 61 Ma |
title_short |
Plate convergence west of Patagonia and the Antarctic Peninsula since 61 Ma |
title_full |
Plate convergence west of Patagonia and the Antarctic Peninsula since 61 Ma |
title_fullStr |
Plate convergence west of Patagonia and the Antarctic Peninsula since 61 Ma |
title_full_unstemmed |
Plate convergence west of Patagonia and the Antarctic Peninsula since 61 Ma |
title_sort |
plate convergence west of patagonia and the antarctic peninsula since 61 ma |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/44621/ https://epic.awi.de/id/eprint/44621/1/Eagles_Scott_2014.pdf https://doi.org/10.1016/j.gloplacha.2014.08.002 https://hdl.handle.net/10013/epic.50957 https://hdl.handle.net/10013/epic.50957.d001 |
long_lat |
ENVELOPE(-62.933,-62.933,-64.883,-64.883) |
geographic |
Antarctic Antarctic Peninsula Drake Passage Magallanes Pacific Patagonia The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Drake Passage Magallanes Pacific Patagonia The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Drake Passage |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Drake Passage |
op_source |
EPIC3Global and Planetary Change, ELSEVIER SCIENCE BV, 123, pp. 189-198, ISSN: 0921-8181 |
op_relation |
https://epic.awi.de/id/eprint/44621/1/Eagles_Scott_2014.pdf https://hdl.handle.net/10013/epic.50957.d001 Eagles, G. orcid:0000-0001-5325-0810 and Scott, B. G. (2014) Plate convergence west of Patagonia and the Antarctic Peninsula since 61 Ma , Global and Planetary Change, 123 , pp. 189-198 . hdl:10013/epic.50957 |
op_doi |
https://doi.org/10.1016/j.gloplacha.2014.08.002 |
container_title |
Global and Planetary Change |
container_volume |
123 |
container_start_page |
189 |
op_container_end_page |
198 |
_version_ |
1766135561537454080 |