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Late Quaternary Sapropel Sediments in the Eastern Mediterranean Sea: Faunal Variations and Chronology

Published online by Cambridge University Press:  20 January 2017

David R. Muerdter ,
James P. Kennett  and
Robert C. Thunell
David R. Muerdter
Affiliation:
Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882-1197
James P. Kennett
Affiliation:
Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882-1197
Robert C. Thunell
Affiliation:
Department of Geology, University of South Carolina, Columbia, South Carolina 29208
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Abstract

Distinctive planktonic foraminiferal assemblages which characterize particular late Quaternary sapropel layers in deep basin sediments from the eastern Mediterranean Sea have been identified using cluster analysis. Three distinct clusters allow for identification and intercore correlation of the nine sapropels deposited during the last 250,000 yr. Cluster 1, representing sapropel layers S1 and S9, exhibits low abundances of Neogloboquadrina dutertrei and high abundances of Globigerinoides ruber; Cluster 2, which groups S3, S5, and S7, contains high abundances of G. ruber, N. dutertrei, and Globigerina bulloides, and Cluster 3, which includes samples from S4, S6, and S8, is marked by extremely abundant N. dutertrei and G. bulloides, and rare G. ruber. Analysis of sedimentation rates in 14 cores reveals the following approximate ages for the sapropel layers: S2 = 52,000 yr B.P.; S3 = 81,000–78,000 yr B.P.; S4 = 100,000–98,000 yr B.P.; and S5 = 125,000–116,000 yr B.P. As previously suggested, sedimentation rates on the Mediterranean Ridge were determined to be relatively constant during the last 127,000 yr. In contrast, basin sedimentation rates have fluctuated markedly from lower rates during interglacial stage 5 to higher rates during the last glacial episode. These glacial/interglacial differences are most pronounced in the northern Ionian Basin, because of increased terrigenous sediment deposition during glacial episodes. Unusually high biogenic sedimentation rates occurred in an arc south of Crete during the deposition of sapropel S5, probably due to higher productivity in this region.

Type
Research Article
Information
Quaternary Research , Volume 21 , Issue 3 , May 1984 , pp. 385 - 403
Copyright
University of Washington

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