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| Titel |
Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions |
| VerfasserIn |
A. M. Snelling, G. E. A. Swann, J. Pike, M. J. Leng |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 5 ; Nr. 10, no. 5 (2014-10-16), S.1837-1842 |
| Datensatznummer |
250117058
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| Publikation (Nr.) |
 copernicus.org/cp-10-1837-2014.pdf |
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| Zusammenfassung |
| Oxygen isotope analyses of different size fractions of Pliocene diatoms
(δ18Odiatom) from the Bering Sea show no evidence of an
isotope offset and support the use of bulk diatom species samples for
palaeoceanographic reconstructions. Additional samples containing
concentrations of sponge spicules produce δ18O values several per
mille (‰) lower than δ18Odiatom with a
calculated mean offset of 3.9‰ ± 1.5. This difference is
significantly greater than modern-day variations in water δ18O
through the regional water column. Despite the potential for oxygen isotope
disequilibrium within δ18Osponge, there appears to be
some similarity between δ18Osponge and a global stacked
benthic δ18Oforam record. This highlights the potential
for δ18Osponge in palaeoenvironmental research at sites
where carbonates are not readily preserved. |
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