Late Quaternary biogenic opal sedimentation and diatom assemblages in Congo Fan sediments.
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Authors: | Uliana, Eleonora | Abstract: | Fluctuations in the sedimentation of biogenic opal and diatoms in the Congo Fan area (Lower Congo Basin off west Africa) during the past 1 million years in the Late Quatemary are the central topics of this thesis. Sediments of ODP Site 1077 (5°1O'S, 10° 26'E; 2,382 m water depth) were analyzed. The time interval studied, the last million year in the Late Quatemary, is a very interesting time in the global climate system when a change from a predominantly 41 kyr cyclicity in the early Pleistocene to the late Quaternary 100 kyr ice age cycles took place. This shift occurred around 800 to 900 ka, following the so-called Mid-Pleistocene Transition. The origin ofthe 100 kyr age cycle dominating the late Pleistocene is an issue not yet fully understood (Imbrie et al., 1993; In: Paleoceanography, 8: 699-735) because the direct influence of eccentricity on insolation is by far too small to produce the corresponding climate style. |
Issue Date: | 2002 | Journal/Edited collection: | Berichte, Fachbereich Geowissenschaften, Universität Bremen | Volume: | 188 | Pages: | 94 pp | Type: | Bericht, Report | ISSN: | 0931-0800 | Secondary publication: | no | URN: | urn:nbn:de:gbv:46-ep000103164 | Institution: | Universität Bremen | Faculty: | Fachbereich 05: Geowissenschaften (FB 05) | Institute: | Marum – Zentrum für Marine Umweltwissenschaften |
Appears in Collections: | Forschungsdokumente |
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