Plutonic processes in transitional oceanic plateau crust: Structure, age and emplacement of the South Rallier du Baty laccolith, Kerguelen Islands
Abstract The syenitic rocks of South Rallier du Baty Intrusive Complex (SRBIC) represent intrusions into the oceanic plateau basalts of the south‐western Kerguelen Islands. The SRBIC was previously interpreted as a typical ring complex due to magma emplacement with cauldron subsidence. Our new struc...
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crwiley:10.1111/ter.12471 2024-04-14T08:14:19+00:00 Plutonic processes in transitional oceanic plateau crust: Structure, age and emplacement of the South Rallier du Baty laccolith, Kerguelen Islands Ponthus, Léandre de Saint Blanquat, Michel Guillaume, Damien Le Romancer, Marc Pearson, Norman O’Reilly, Suzanne Grégoire, Michel Institut Polaire Français Paul Emile Victor Centre National de la Recherche Scientifique 2020 http://dx.doi.org/10.1111/ter.12471 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fter.12471 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ter.12471 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ter.12471 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Terra Nova volume 32, issue 6, page 408-414 ISSN 0954-4879 1365-3121 Geology journal-article 2020 crwiley https://doi.org/10.1111/ter.12471 2024-03-19T10:54:17Z Abstract The syenitic rocks of South Rallier du Baty Intrusive Complex (SRBIC) represent intrusions into the oceanic plateau basalts of the south‐western Kerguelen Islands. The SRBIC was previously interpreted as a typical ring complex due to magma emplacement with cauldron subsidence. Our new structural and geochronological data reveal that it is a laccolith built between 11.6 and 7.9 Ma by successive injections of magma sheets around the crust–mantle boundary, with an average injection rate between 0.8 and 1.4 × 10 −4 km 3 /year. These results establish strong similarities between the SRBIC, the only recorded example of a felsic laccolith in an oceanic intraplate setting, and many continental plutons emplaced in various geodynamic setting. The SRBIC thus has the characteristics of a continental plutonic complex emplaced in an oceanic plateau crust. We postulate the critical parameter relevant to causing such similarities and plutonic magmatism is crustal thickness. Article in Journal/Newspaper Kerguelen Islands Wiley Online Library Kerguelen Kerguelen Islands Rallier du Baty ENVELOPE(69.804,69.804,-49.285,-49.285) Terra Nova 32 6 408 414 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
Geology |
spellingShingle |
Geology Ponthus, Léandre de Saint Blanquat, Michel Guillaume, Damien Le Romancer, Marc Pearson, Norman O’Reilly, Suzanne Grégoire, Michel Plutonic processes in transitional oceanic plateau crust: Structure, age and emplacement of the South Rallier du Baty laccolith, Kerguelen Islands |
topic_facet |
Geology |
description |
Abstract The syenitic rocks of South Rallier du Baty Intrusive Complex (SRBIC) represent intrusions into the oceanic plateau basalts of the south‐western Kerguelen Islands. The SRBIC was previously interpreted as a typical ring complex due to magma emplacement with cauldron subsidence. Our new structural and geochronological data reveal that it is a laccolith built between 11.6 and 7.9 Ma by successive injections of magma sheets around the crust–mantle boundary, with an average injection rate between 0.8 and 1.4 × 10 −4 km 3 /year. These results establish strong similarities between the SRBIC, the only recorded example of a felsic laccolith in an oceanic intraplate setting, and many continental plutons emplaced in various geodynamic setting. The SRBIC thus has the characteristics of a continental plutonic complex emplaced in an oceanic plateau crust. We postulate the critical parameter relevant to causing such similarities and plutonic magmatism is crustal thickness. |
author2 |
Institut Polaire Français Paul Emile Victor Centre National de la Recherche Scientifique |
format |
Article in Journal/Newspaper |
author |
Ponthus, Léandre de Saint Blanquat, Michel Guillaume, Damien Le Romancer, Marc Pearson, Norman O’Reilly, Suzanne Grégoire, Michel |
author_facet |
Ponthus, Léandre de Saint Blanquat, Michel Guillaume, Damien Le Romancer, Marc Pearson, Norman O’Reilly, Suzanne Grégoire, Michel |
author_sort |
Ponthus, Léandre |
title |
Plutonic processes in transitional oceanic plateau crust: Structure, age and emplacement of the South Rallier du Baty laccolith, Kerguelen Islands |
title_short |
Plutonic processes in transitional oceanic plateau crust: Structure, age and emplacement of the South Rallier du Baty laccolith, Kerguelen Islands |
title_full |
Plutonic processes in transitional oceanic plateau crust: Structure, age and emplacement of the South Rallier du Baty laccolith, Kerguelen Islands |
title_fullStr |
Plutonic processes in transitional oceanic plateau crust: Structure, age and emplacement of the South Rallier du Baty laccolith, Kerguelen Islands |
title_full_unstemmed |
Plutonic processes in transitional oceanic plateau crust: Structure, age and emplacement of the South Rallier du Baty laccolith, Kerguelen Islands |
title_sort |
plutonic processes in transitional oceanic plateau crust: structure, age and emplacement of the south rallier du baty laccolith, kerguelen islands |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1111/ter.12471 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fter.12471 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ter.12471 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ter.12471 |
long_lat |
ENVELOPE(69.804,69.804,-49.285,-49.285) |
geographic |
Kerguelen Kerguelen Islands Rallier du Baty |
geographic_facet |
Kerguelen Kerguelen Islands Rallier du Baty |
genre |
Kerguelen Islands |
genre_facet |
Kerguelen Islands |
op_source |
Terra Nova volume 32, issue 6, page 408-414 ISSN 0954-4879 1365-3121 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/ter.12471 |
container_title |
Terra Nova |
container_volume |
32 |
container_issue |
6 |
container_start_page |
408 |
op_container_end_page |
414 |
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1796312493302218752 |