Contrasting geophysical and geochemical signatures of an axial volcano at the axis of the Wharton fossil spreading center | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Contrasting geophysical and geochemical signatures of an axial volcano at the axis of the Wharton fossil spreading center

Type de publication:

Journal Article

Source:

Geophys. res. lett., Volume 26, Ticket 8, p.1053-1056 (1999)

ISBN:

0094-8276

Numéro d'appel:

PUB

URL:

http://www.agu.org/grl/cont9697.html

Mots-clés:

Géochimie et volcanologie ; dorsale fossile wharton samudra, Gravimétrie et géodynamique ; UMR 7046, UMR 7577

Résumé:

The Styx volcano is a prominent seamount (20-30 km diameter, 2500 m high) located at the axis of the Wharton fossil spreading center (N-E Indian Ocean), where seafloor spreading stopped 40 Ma ago. Gravity modeling shows that it was emplaced on a weak lithosphere, in agreement with an on axis origin when seafloor spreading was active. The rocks dredged at the summit of the volcano are extreme typical alkaline basalts, indicating a deep enriched mantle source. We show here that most of this seamount was emplaced during the final stage of the seafloor spreading in the Wharton Basin. We then discuss how alkaline magmatism can be emplaced at the summit of the Styx.

Notes:

Geophysical research letters