Title: Paleo-redox fronts and their formation in carbonate mound sediments from the Rockall Trough
Authors: van der Land, Cees ×
Mienis, Furu
de Haas, Henk
de Stigter, Henko C.
Swennen, Rudy
Reijmer, John J.G.
van Weering, Tjeerd C.E. #
Issue Date: 1-Jun-2011
Publisher: Elsevier Scientific Pub. Co.
Series Title: Marine Geology vol:284 issue:1-4 pages:86-95
Abstract: Piston cores from the summits of coral topped carbonate mounds at the south west Rockall Trough margin reveal that the sediments have undergone significant post-depositional modifications affecting the original geochemical signature and mineralogical composition of the sediments. This diagenetic imprint provides information about the geochemical processes within cold-water coral mounds. The most prominent result of diagenetic alteration of the primary sediment composition is the absence or poor preservation of aragonitic coral skeletons in certain depth intervals associated with lithification.

This study focuses on the enrichment of redox-sensitive elements and the dissolution of primary magnetic ferric iron minerals in the depth interval below lithification levels. By combining the magnetic susceptibility with the XRF signal of Fe and Ti specifically, intervals with susceptibility variations related to the conversion of strongly magnetic into weakly magnetic iron species can be defined.

In all three studied cores a succession is recognised with a lithified interval with aragonite dissolution and low-Mg calcite precipitates that is underlain by an interval of magnetite dissolution and of iron and manganese enrichment. For the most recent lithified interval it is demonstrated that initial lithification occurred before an erosional regime was in place, most likely near the end of interglacial or at the start of glacial periods.
ISSN: 0025-3227
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Geology
× corresponding author
# (joint) last author

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