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Author |
Léandre Ponthus, Michel de Saint Blanquat, Damien Guillaume, Marc Le Romancer, Norman Pearson, Suzanne O’Reilly, Michel Grégoire |
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Title |
Plutonic processes in transitional oceanic plateau crust: Structure, age and emplacement of the South Rallier du Baty laccolith, Kerguelen Islands |
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Year  |
2020 |
Publication |
Terra Nova |
Abbreviated Journal |
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Volume |
32 |
Issue |
6 |
Pages |
408-414 |
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Keywords |
alkaline magmatism Kerguelen oceanic plateau pluton emplacement syenite intrusion |
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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 km3/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. |
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Programme |
444-1077 |
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Thesis |
Bachelor's thesis |
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ISSN |
1365-3121 |
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Approved |
yes |
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Call Number |
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Serial |
8270 |
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