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• W2188223105 abstract "The assemblages of planktonic foraminifers at Sites 975 and 976 were studied quantitatively. The variations in the relative abundances of the species enabled us to identify four intervals during the Pleistocene. In Interval 1, there are frequent level s with high proportions of N. pachyderma (left-coiling) and very abundant G. inflata. In Interval 2, N. pachyderma (left-coiling) is virtually absent. Interval 3 consists of a long period with the frequent occurrence of N. pachyderma (left-coiling). Interval 4, covering the upper part of the Pleistocene, is dominated by N. pachyderma (right-coiling). In this interval, a first peak of N. pachyderma (left-coiling) was detected at both sites, together with a second, younger, peak at Site 976 only. A Q-mode principal-component analysis showed that the first five principal components (97.7% of the variance) are dominated by N. pachyderma (right-coiling), G. inflata, N. pachyderma (left-coiling), G. ruber, and G. bulloides, respectively. The modern analogs of the Quaternary samples were identified in a core-top data set, divided into groups by k-means clustering procedure. A discriminant analysis was used (to include each Quaternary sample in a present-day group) followed by calculating the similarity (cosine of the angle between vectors) between each down-core sample and the core-top samples of its group. On the whole, the results suggest that paleoceanographic conditions in the western Mediterranean during the Quaternary were equivalent to those currently prevailing between the parallels of North Cape and the Canary Islands. During the first Pleistocene interval, predominant conditions were similar to present-day ones, (although a little warmer at Menorca Rise), but were interrupted by very cold episodes. During Interval 2, th e conditions were generally colder, but more stable, with no very cold episodes. Interval 3 had similar conditions to the first i nterval, although there was a higher incidence of the very cold episodes. Finally, Interval 4 is characterized by conditions similar to those of the second interval, although somewhat more regular and a little cooler." @default.
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• W2188223105 date "1999-02-01" @default.
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• W2188223105 title "Paleoceanographic conditions during the Quaternary at Sites 976 (Alboran Sea) and 975 (Menorca Rise) inferred from the planktonic foraminiferal assemblages: basis for a biostratigraphy" @default.
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• W2188223105 doi "https://doi.org/10.2973/odp.proc.sr.161.240.1999" @default.
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