Lower cretaceous basalt and sediments from the Kerguelen Plateau |
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| Authors: | Lucien Leclaire Yannis Bassias Micheline Denis-Clocchiatti Hugh Davies Isabelle Gautier Bernard Gensous Pierre-Jean Giannesini Philippe Patriat Jacques Segoufin Michel Tesson Jacques Wannesson |
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| Institution: | (1) Laboratoire de Géologie du Muséum National d'Histoire Naturelle, 43 rue Buffon, 75005 Paris, France;(2) Institut d'Océanographie, Muséum National d'Histoire Naturelle, 43 rue Cuvier, 75005 Paris, France;(3) Bureau of Mineral Resources, GPO Box 378, 2601 Canberra, Australia;(4) Laboratoire de Pétrologie, Université de Paris VI, 4 Place Jussieu, Paris;(5) Laboratoire de Sédimentologie et Géochimie marines, Université de Perpignan, 66025 Perpignan, France;(6) Laboratoire de Géophysique marine de l'IPG de Paris et U.A. 729, 4 Place Jussieu, 75005 Paris, France;(7) Institut Français du Pétrole, BP 311, 92506 Rueil-Malmaison, France |
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| Abstract: | Geological samples from the southern Kerguelen Plateau include Lower Cretaceous basalt and lava breccia, probable Lower Cretaceous conglomerate and shelf limestone, Upper Cretaceous chert with dolomite, Upper Cretaceous-Eocene ooze, and Tertiary conglomerate. Neogene sediments are only a few hundred m thick, and include foraminiferal and diatomaceous ooze, and ice-rafted debris. In conjunction with seismic reflection profiles, the samples indicate Early Cretaceous near-shore volcanism, followed by erosion, sedimentation, and subsidence through Cretaceous; arching of the plateau at the end of Cretaceous; subsidence through Paleogene; widespread emergence in mid-Tertiary; and slow subsidence through Neogene. |
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