Horizon 1 1 17 ACLN : Articles dans des revues avec comité de lecture non répertoriées par l'AERES Geology 137-140 TECTONIQUE DE PLAQUES GEOLOGIE STRUCTURALE CROUTE CONTINENTALE SISMOLOGIE VOLCANISME OCEAN INDIEN KERGUELEN PLATEAU 1995 fdi:42472 ENG Geology 0091-7613 6 10.1130/0091-7613(1995)023<0137:KPAVPM>2.3.CO;2 https://www.documentation.ird.fr/hor/fdi:42472 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/42472.pdf 23 Horizon (IRD) 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. 064TECTO