Significance of clay mineral assemblages in the Antarctic Ocean

Author(s): Ehrmann, Werner U.; Melles, Martin; Kuhn, Gerhard; Grobe, Hannes
Author Affiliation(s): Primary:
Alfred Wegener Inst. Polar and Mar. Res., Bremerhaven, Federal Republic of Germany
Volume Title: Marine Geology
Source: Marine Geology, 107(4), p.249-273. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English
Summary: In late Mesozoic to Paleogene sediments, clay mineral assemblages are sensitive tools for reconstructing climatic conditions. For example, the shift from smectite-dominated assemblages to illite- and chlorite-dominated assemblages in the earliest Oligocene clearly documents the transition from chemical weathering conditions under a warm and humid climate to physical weathering under cooler conditions. Submarine elevations such as Maud Rise and Kerguelen Plateau give the best record for direct paleoclimatic and paleoceanographic studies. At the proximal sites of the continental slope and shelf, as well as in the deep sea, the paleoclimatic information normally is masked by a variety of processes resulting in sediment redistribution. At those sites, in contrast, the clay mineral assemblages bear a wealth of information on different sedimentary processes. After the establishment of a continental East Antarctic ice sheet, physical weathering prevailed. Variations in the clay mineral records predominantly reflect the influence of different sediment sources resulting from different glacial, hydrographic or gravitational transport processes. Because these sedimentation processes are generally linked to climatic variations, the clay mineral assemblages in most of the Neogene and Quaternary sediments provide indirect paleoclimatic information. (Auth. mod.)
Year of Publication: 1992
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 12 Stratigraphy, Historical Geology and Paleoecology; Antarctic Ocean; Antarctica; Areal studies; Cenozoic; Clay mineralogy; Clay minerals; Cretaceous; Glacial environment; Glaciation; Glaciomarine environment; Ice sheets; Leg 113; Leg 119; Marine environment; Marine sediments; Mesozoic; Ocean Drilling Program; Oceanography; Paleo-oceanography; Paleoclimatology; Provenance; Sediments; Sheet silicates; Silicates; Upper Cretaceous; Weathering
Coordinates: S704954 S614837 E0030559 W0432706
S684114 S492407 E0855147 E0713936
Record ID: 1992054291
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States