Structure of the cretaceous Kerguelen volcanic province (southern Indian Ocean) from wide-angle seismic data

Travel time inversion and amplitude modelling of OBS wide-range seismic data recorded in the Enderby Basin, west of the Kerguelen Plateau, show a 10 to 13 km thick crust characteristic of oceanic crust emplaced near a hotspot (velocity reaches 7.4 km/s at the bottom of the crust). From this study we...

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Bibliographic Details
Main Authors: Charvis, Philippe, Operto, S.
Format: Text
Language:English
Published: 1999
Subjects:
GEODYNAMIQUE
POINT CHAUD
SISMOGRAMME
PROFIL SISMIQUE
CRETACE
ARCHIPEL
PLATEAU
ETUDE REGIONALE
Indian
Kerguelen
Iceland
Online Access:http://www.documentation.ird.fr/hor/fdi:010021650
Description
Summary:Travel time inversion and amplitude modelling of OBS wide-range seismic data recorded in the Enderby Basin, west of the Kerguelen Plateau, show a 10 to 13 km thick crust characteristic of oceanic crust emplaced near a hotspot (velocity reaches 7.4 km/s at the bottom of the crust). From this study we infer that the eastern border of the Enderby Basin is part of the Cretaceous Kerguelen Volcanic Province, and that it results from the influence of the Kerguelen hotspot on the spreading axis. Synthetic seismogram modelling confirms that the northern Kerguelen Plateau is propably emplaced over the Kerguelen hotspot in an Iceland-type setting. (Résumé d'auteur)

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