Composition of Eocene-Oligocene sediments from the Kerguelen Plateau, Southern Ocean ...
Middle Eocene to late Oligocene sediments recovered at Ocean Drilling Program Sites 689 and 690 on Maud Rise in the southernmost Atlantic Ocean and at Sites 738 and 744 on Kerguelen Plateau in the southernmost Indian Ocean were analysed in order to study the depositional environment and the palaeocl...
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
1992
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.702088 https://doi.pangaea.de/10.1594/PANGAEA.702088 |
| Summary: | Middle Eocene to late Oligocene sediments recovered at Ocean Drilling Program Sites 689 and 690 on Maud Rise in the southernmost Atlantic Ocean and at Sites 738 and 744 on Kerguelen Plateau in the southernmost Indian Ocean were analysed in order to study the depositional environment and the palaeoclimate. Special emphasis was placed on the reconstruction of the formation of a cryosphere on the Antarctic continent. The investigations include quantifications of carbonate and opal contents, grain size analyses and studies of clay mineral assemblages. The sedimentary sequence at all sites under investigation is highly pelagic, with nannofossil oozes and chalks dominant. The first indication of probable glacierization at sea level is in the form of isolated gravel and terrigenous sand grains, which indicate ice-rafting from middle Eocene time at c. 45.5 Ma. This is supported by enhanced concentrations of detrital chlorite and reworked kaolinite. Probably, some glaciers reached the sea, while most of the continent ... : Supplement to: Ehrmann, Werner; Mackensen, Andreas (1992): Sedimentological evidence for the formation of an East Antarctic ice sheet in Eocene/Oligocene time. Palaeogeography, Palaeoclimatology, Palaeoecology, 93(1-2), 85-112 ... |
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