Titre du document / Document title
Sedimentological evidence for the formation of an East Antarctic ice sheet in Eocene/Oligocene time
Auteur(s) / Author(s)
EHRMANN W. U. ;
MACKENSEN A. ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
Scott polar res. inst., Cambridge CB2 1ER, ROYAUME-UNI
Résumé / Abstract
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
Revue / Journal Title
Palaeogeography, palaeoclimatology, palaeoecology
ISSN
0031-0182
CODEN PPPYAB
Source / Source
1992, vol. 93, n
o1-2, pp. 85-112 (3 p.)
Langue / Language
Anglais
Editeur / Publisher
Elsevier, Amsterdam, PAYS-BAS
(1965)
(Revue)
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Localisation / Location
INIST-CNRS, Cote INIST : 12351, 35400002792597.0060
Nº notice refdoc (ud4) : 5254620
