Unbekannt
PANGAEA
In:
Supplement to: Dupont, Lydie M; Beug, Hans-Jürgen; Stalling, H; Tiedemann, Ralf (1989): First palynological results from ODP Site 658 at 21°N west off Africa: pollen as climate indicators. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 93-111, https://doi.org/10.2973/odp.proc.sr.108.174.1989
Publikationsdatum:
2024-01-09
Beschreibung:
Ocean Drilling Program Site 658 at 21°N off northwest Africa has a high sedimentation rate and a high concentration of pollen grains and is thus very suitable for detailed pollen analysis.
The time scale for the upper 100 m (the last 670 k.y.) of Site 658 is based on biostratigraphic data and isotope stratigraphy. The pollen record has been divided into 34 zones. These are classified into 7 zone types covering a range from very arid to rather humid conditions.
The sequence shows a long-term climatic decline: strong glacial stages were found only after 480 k.y. and strong interglacial stages only before 280 k.y. The Site 658 record correlates well with a terrestrial sequence from northern Greece, although both records differ in their response to global climatic change.
Spectral analysis shows a 100- and a 42-k.y. period in the curves of pollen brought in by the northwest trade winds and only a 42-k.y. period in the curves of pollen mostly transported by the African Easterly Jet. A 31-k.y. period is found in the curves for Ephedra and Chenopodiaceae-Amaranthaceae. In addition, Ephedra shows a 54-k.y. period.
Schlagwort(e):
108-658; 108-658A; 108-658B; Canarias Sea; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg108; Ocean Drilling Program; ODP
Materialart:
Dataset
Format:
application/zip, 5 datasets
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