Stable isotopic indication for the cyst formation depth of Campanian/Maastrichtian calcareous dinoflagellates

δ¹⁸O and δ¹³C values for the calcareous dinoflagellate species Orthopithonella? globosa (Fütterer 1984) Lentin and Williams 1985 and Pirumella krasheninnikovii (Bolli 1974) Lentin and Williams 1993 from latest Campanian and earliest Maastrichtian of ODP Hole 690C (Weddell Sea, Antarctic Ocean) have...

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Bibliographic Details
Published in:Micropaleontology 2003-12, Vol.49 (4 p.375-380), p.375-380
Main Authors: Friedrich, Oliver, Meier, K J Sebastian
Format: Article
Language:English
Subjects:
Antarctic region
carbon
habitats
isotopes
Miozoa
oxygen
paleoceanography
photosynthesis
Retaria
species
surface water
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Summary:δ¹⁸O and δ¹³C values for the calcareous dinoflagellate species Orthopithonella? globosa (Fütterer 1984) Lentin and Williams 1985 and Pirumella krasheninnikovii (Bolli 1974) Lentin and Williams 1993 from latest Campanian and earliest Maastrichtian of ODP Hole 690C (Weddell Sea, Antarctic Ocean) have been studied in order to evaluate the species' depth habitat in the water column and their applicability in paleoceanographic studies. The calcareous dinoflagellates show isotopic values comparable to probably shallow-dwelling planktic foraminifera from the same samples in δ¹⁸O, but have an offset of about −5‰ to −7‰ in δ¹³C. This suggests that calcareous dinoflagellate oxygen isotopes may provide information for paleoceanographic reconstructions of sea-surface water temperatures, whereas their extremely light carbon isotope values are probably due to photosynthetic processes.
ISSN:0026-2803
DOI:10.1661/0026-2803(2003)049%5B0375:SIIFTC%5D2.0.CO;2