Geochemistry on sediment and nodules from the Madeira Abyssal Plain, supplement to: Ebbing, J; van der Borg, Klaas; de Jong, Arie F M; Nederlof, H P (1991): Continuous surface dwelling of manganese nodules on a hill on the Madeira Abyssal Plain during abrupt sedimentation changes. Marine Geology, 98(1), 73-82

DOI

The accretion rate of manganese nodules and the sedimentation rate of the underlying sediment has been studied with 10Be and 14C on a nodule covered hill in the Madeira Abyssal Plain. The accretion rate of (3.2 +/- 0.6) mm/Ma for the nodules is considerably smaller than the average sedimentation rate of 12 mm/ka for the last 50-100 ka. The mechanism that kept the nodules at the surface in this specific environment during the last 40 ka is likely to be flotation. The discovery of a large manganese-covered concretion in a piston core points to a long period of sediment winnowing. The 14C analyses also seem to point to an increase in the sedimentation rate round 6500 yrs B.P.

Identifier
DOI http://dx.doi.org/doi:10.1594/PANGAEA.888582
Metadata Access http://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite3&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.888582
Provenance
Creator van der Borg, Klaas;Nederlof, H P;de Jong, Arie F M;Ebbing, J
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1991
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Representation
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Discipline Earth System Research
Spatial Coverage (31N-32N,25W-25W)
Temporal Point 1986-10-01T11:59:59Z