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Diatom oxygen isotopes: evidence of a species effect in the sediment record

Swann, George E.A.; Leng, Melanie J.; Sloane, Hilary J.; Maslin, Mark A.; Onodera, Jonaotaro

Authors

George E.A. Swann george.swann@nottingham.ac.uk

Melanie J. Leng

Hilary J. Sloane

Mark A. Maslin

Jonaotaro Onodera



Abstract

Diatom oxygen isotope measurements are commonly made on bulk mixed species assemblages due to the difficulty in purifying and separating individual taxa. As such, it is essential to understand processes in diatoms which may lead to isotope offsets both between and within individual species. Existing studies have suggested that mechanisms which may lead to isotopes offset in diatoms, such as vital effects, are either nonexistent or negligible. Here, we present a suite of diatom oxygen isotope data from the onset of major Northern Hemisphere Glaciation at ODP site 882 in the northwest Pacific Ocean which display large offsets (mean = 1.23%, max = 3.51%, error = 0.84%) between two different size fractions (75–150 um and >150 um) that are dominated by only two species: Coscinodiscus marginatus and Coscinodiscus radiatus. These offsets are most likely size related, although additional interspecies and intraspecies effects may also be important in determining the exact magnitude of the offsets. Consequently, considerable care is needed when interpreting bulk diatom oxygen isotope data in relation to paleoenvironmental change, especially when the amount of stratigraphical change within the isotopes is small.

Journal Article Type Article
Publication Date Jan 1, 2007
Journal Geochemistry Geophysics Geosystems
Electronic ISSN 1525-2027
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 8
Issue 6
Article Number Q06012
APA6 Citation Swann, G. E., Leng, M. J., Sloane, H. J., Maslin, M. A., & Onodera, J. (2007). Diatom oxygen isotopes: evidence of a species effect in the sediment record. Geochemistry, Geophysics, Geosystems, 8(6), doi:10.1029/2006GC001535
DOI https://doi.org/10.1029/2006GC001535
Publisher URL http://dx.doi.org/10.1029/2006GC001535
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information Copyright: American Geophysical Union

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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