Publications des scientifiques de l'IRD

Operto S., Charvis Philippe. (1995). Kerguelen plateau : a volcanic passive margin fragment ?. Geology, 23 (6), p. 137-140. ISSN 0091-7613.

Titre du document
Kerguelen plateau : a volcanic passive margin fragment ?
Année de publication
1995
Type de document
Article
Auteurs
Operto S., Charvis Philippe
Source
Geology, 1995, 23 (6), p. 137-140 ISSN 0091-7613
The 21-25-km-thick crust of the southern Kerguelen Plateau consists of three units: (1) a ≤ 2.3-km-thick sedimentary cover; (2) a 3-6-km-thick basaltic layer with velocities ranging from 4.5 to 6.2 km/s; and (3) a 15-17-km-thick lower crust with velocities from 6.6 to 6.9 km/s, including a 3-6-km-thick transition zone located at the base of the crust. The low-velocity transition zone has an average velocity of 6.7 km/s and exhibits several internal wide-angle reflections. The velocity-depth structure of the crust differs significantly from that of other hotspot-related oceanic plateaus and suggests that the southern Kerguelen Plateau may be a fragment of a volcanic passive margin composed of a thinned continental crust overlain by basalt flows.
Plan de classement
Tectonique [064TECTO]
Descripteurs
TECTONIQUE DE PLAQUES ; GEOLOGIE STRUCTURALE ; CROUTE CONTINENTALE ; SISMOLOGIE ; VOLCANISME
Description Géographique
OCEAN INDIEN
Localisation
Fonds IRD [F B42472] ; Bondy
Identifiant IRD
fdi:42472
Contact