The role of diagenetic carbonate concretions in the preservation of the original sedimentary record

El Albani, A., Vachard, D., Kuhnt, W. and Thurow, J. (2001) The role of diagenetic carbonate concretions in the preservation of the original sedimentary record Sedimentology, 48 (4). pp. 875-886. DOI 10.1046/j.1365-3091.2001.00398.x.

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Abstract

The Upper Cretaceous organic rich limestones and marls of the Tarfaya basin of southwest Morocco contain numerous calcite concretions, which formed during early diagenesis. Relative textural similarities are observed both in the concretions and in the host sediments. However, the biological content of the concretions is considerably higher than in the host marls and limestones. Evidence for fossil dissolution in the host marls, and the absence of concretions in some fossil-rich zones, suggest that the difference in fossil abundance between the concretions and host rock is a function of dissolution, rather than preferential precipitation in fossil-rich areas. Consequently, the carbonate concretions appear to represent the 'memory' of the sediment and allow quantification of the original biological components and are potential tools for estimating the original biological material deposited in the soft sediments.

Document Type: Article
Keywords: biogenic material carbonate concretions Cretaceous early diagenesis preservation sedimentary record organic-rich sediments ne england upper lias growth evolution southern siderite zonation nodules calcite
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1046/j.1365-3091.2001.00398.x
ISSN: 0037-0746
Date Deposited: 02 Feb 2012 07:25
Last Modified: 08 Oct 2012 10:39
URI: http://eprints.uni-kiel.de/id/eprint/16277

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