Uliana, EleonoraEleonoraUliana2020-03-252020-03-2520020931-0800https://media.suub.uni-bremen.de/handle/elib/3852Fluctuations 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.94 ppdeinfo:eu-repo/semantics/openAccess500 Naturwissenschaften und Mathematik::550 Geowissenschaften, GeologieBericht, Reporturn:nbn:de:gbv:46-ep000103164