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


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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Original Publication URL: http://dx.doi.org/10.1029/2003PA000958

Description/Abstract

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.

Item Type: Article
ISSNs: 0883-8305 (print)
Related URLs:
Subjects: Q Science > QE Geology
G Geography. Anthropology. Recreation > GC Oceanography
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 37836
Date Deposited: 26 May 2006
Last Modified: 27 Mar 2014 18:23
Contact Email Address: sxg@noc.soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/37836

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