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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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Paleo-redox fronts and their formation in carbonate mound sediments from the Rockall Trough van der Land, C.; Mienis, F.; de Haas, H.; de Stigter, H.C.; Swennen, R.; Reijmer, J.J.G.; van Weering, T.C.E. (2011). Paleo-redox fronts and their formation in carbonate mound sediments from the Rockall Trough. Mar. Geol. 284(1-4): 86-95. dx.doi.org/10.1016/j.margeo.2011.03.010 In: Marine Geology. Elsevier: Amsterdam. ISSN 0025-3227; e-ISSN 1872-6151, meer

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Trefwoord

Marien/Kust

Author keywords

carbonate diagenesis; carbonate mound; cold water corals; redox

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Auteurs		Top
van der Land, C. Mienis, F., meer de Haas, H., meer de Stigter, H.C., meer	Swennen, R., meer Reijmer, J.J.G. van Weering, T.C.E., meer

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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.

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