10.1594/PANGAEA.696097
Kassens, Heidemarie
Heidemarie
Kassens
Sarnthein, Michael
Michael
Sarnthein
Grain size distribution, carbon content and wet bulk density of sediment cores in the equatorial Atlantic and the Norwegian Sea
PANGAEA
1989
Supplementary Publication Series of Datasets
Giant box corer
Box corer
Gravity corer
Kasten corer
M65
ANT-IV/1c
M2/2
Meteor (1964)
Polarstern
Meteor (1986)
Institute for Geosciences, Christian Albrechts University, Kiel (GIK/IfG)
Quaternary Environment of the Eurasian North (QUEEN)
1989
en
10.1029/pa004i003p00253
7 datasets
application/zip
Creative Commons Attribution 3.0 Unported
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.
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
-22.865
4.905
4.7333333333333
70.305
Atlantic Ocean
Equatorial Atlantic
Norwegian Sea
Fourth Framework Programme
https://doi.org/10.13039/100011105
MAS3980185
Quaternary Environment of the Eurasian North