Grain size distribution, carbon content and wet bulk density of sediment cores in the equatorial Atlantic and the Norwegian Sea, supplement to: Kassens, Heidemarie; Sarnthein, Michael (1989): A link between paleoceanography, early diagenetic cementation, and shear strength maxima in Late Quaternary deep-sea sediments? Paleoceanography, 4(3), 253-269


Near-surface sediments from the equatorial east Atlantic and the Norwegian Sea exhibit pronounced shear strength maxima in profiles from the peak Holocene and Pleistocene. These semi-indurated layers start to occur at 8-102 cm below the sediment surface and can be explained neither by the modal composition nor by the effective overburden pressure of the sediments. However, scanning electron microscope and microprobe data exhibit micritic crusts and crystal carpets, which are clearly restricted to (undisturbed) samples from indurated layers and form a manifest explanation for their origin. The minerals precipitated comprise calcite, aragonite, and in samples more proximal to the African continent SiO2 needles, and needles of as yet unidentified K-Mg-Fe-Al silicates, crusts of which dominate the indurated layers in the Norwegian Sea. By their stratigraphic position in deep-sea sediments the carbonate-based shear strength maxima are tentatively ascribed to dissolved adjacent pteropod layers from the early Holocene and hence to short-lived no-analogue events of early diagenesis. Possibly, they have been controlled by a reduced organic carbon flux, leading to increased aragonite preservation in the deep sea.

Related Identifier
Metadata Access
Creator Kassens, Heidemarie; Sarnthein, Michael
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1989
Funding Reference Fourth Framework Programme
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Size 7 datasets
Discipline Geosciences
Spatial Coverage (-22.865W, 4.733S, 4.905E, 70.305N); Atlantic Ocean; Equatorial Atlantic; Norwegian Sea
Temporal Coverage Begin 1983-07-11T00:00:00Z
Temporal Coverage End 1986-07-13T00:00:00Z