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Identification of dissolution patterns in nannofossil assemblages: a high-resolution comparison of synchronous records from Ceara Rise, ODP Leg 154

Record type: Article

Fossil nannoplankton assemblages are controlled by both initial plankton production and dissolution throughout the water column and on the seafloor. It is usually assumed that dissolution can be identified by subjective visual assessment of preservation state. We have tested this by a quantitative comparison of mid-Pliocene nannofossil assemblages in two closely located ODP sites, Ceara Rise Sites 926 and 929, both with apparently good preservation but located respectively above and below the lysocline. We demonstrate that, despite an absence of obvious qualitative preservation differences, dissolution has removed perhaps 80% of the assemblage in the sub-lysocline Site 929. This has produced consistent distortions in the assemblages and artificially enhanced abundance variations patterns of individual species. The results provide strong cautions for palaeoceanographic interpretation of nannofossil data and allow us to uniquely extract a dissolution variation record and provide a detailed ranking of dissolution susceptibility of Pliocene nannofossils.

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Citation

Gibbs, S.J., Shackleton, N.J. and Young, J.R. (2004) Identification of dissolution patterns in nannofossil assemblages: a high-resolution comparison of synchronous records from Ceara Rise, ODP Leg 154 Paleoceanography, 19, (1), PA1029-[12pp]. (doi:10.1029/2003PA000958).

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Published date: March 2004

Identifiers

Local EPrints ID: 37836
URI: http://eprints.soton.ac.uk/id/eprint/37836
ISSN: 0883-8305
PURE UUID: 2becc3cd-d6d6-48b0-a803-494ef316755c

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Date deposited: 26 May 2006
Last modified: 17 Jul 2017 15:41

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Contributors

Author: S.J. Gibbs
Author: N.J. Shackleton
Author: J.R. Young

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