The University of Southampton
University of Southampton Institutional Repository

Suitability of stable oxygen and carbon isotopes of calcareous dinoflagellate cysts for paleoceanographic studies: evidence from the Campanian/Maastrichtian cooling phase

Friedrich, O. and Meier, K.J.S. (2006) Suitability of stable oxygen and carbon isotopes of calcareous dinoflagellate cysts for paleoceanographic studies: evidence from the Campanian/Maastrichtian cooling phase Palaeogeography, Palaeoclimatology, Palaeoecology, 239, (3-4), pp. 456-469. (doi:10.1016/j.palaeo.2006.02.005).

Record type: Article

Abstract

order to determine the possible usefulness of stable isotope measurements on calcareous dinoflagellate cysts for paleoceanographic and paleoclimatic studies, we have produced oxygen and carbon isotope records of the species Pirumella krasheninnikovii (Bolli, H.M., 1974. Jurassic and Cretaceous Calcisphaerulidae from DSDP Leg 27, eastern Indian Ocean. Initial Reports of the Deep Sea Drilling Project 27, 843–907.) for the latest Campanian to earliest Maastrichtian ( 73–68 Ma) of high-latitude Ocean Drilling Program Hole 690C in the southern South Atlantic (eastern Weddell Sea). Foraminiferal stable isotope values characterize this time interval as a phase of continuous cooling, superimposed by a short-term, strong cooling event between 71 and 70 Ma that was detected at various sites in the mid to high latitudes. This event is interpreted to reflect short-term surface-water cooling, leading to changes in the mode and direction of deep-water formation and possibly the growth of continental ice sheets. Our ?18O values of calcareous cysts verify this event as well as the general cooling of surface waters during the latest Campanian and early Maastrichtian. Prior to this cooling event, between 72 and 71 Ma, a negative excursion in accompanying ?13C records of planktic and benthic foraminifera was observed. This negative excursion and the subsequent positive one were proposed to reflect sea-level fluctuations, changes in productivity, and/or changes in the ratio of organic to inorganic carbon input to the ocean. The ?13C values of calcareous cysts show the positive excursion between 71 and 70 Ma, but don't show the expected negative excursion before. In addition, they yield extremely light carbon isotope values that probably resulted from photosynthetic processes.

As the stable oxygen isotope data of the calcareous dinoflagellate species P. krasheninnikovii show isotopic shifts comparable to planktic foraminifera from the same locality and from various other sites in the Pacific and South Atlantic oceans, we suggest that calcareous cyst oxygen isotopes can provide information for paleoceanographic reconstructions of sea-surface water temperatures and paleoceanographic changes. However, the application of carbon isotope data from cysts of P. krasheninnikovii appears to be questionable, and investigations of different species are needed to further evaluate the reconstruction potential based on stable isotopes and to assess species-specific vital effects.

Full text not available from this repository.

More information

Published date: 25 September 2006
Keywords: Ocean drilling program, Calcareous dinoflagellate cysts, Maastrichtian, Campanian, Stable isotopes

Identifiers

Local EPrints ID: 49993
URI: http://eprints.soton.ac.uk/id/eprint/49993
ISSN: 0031-0182
PURE UUID: 8c933a5d-8a57-4e2e-9367-b319d8255e06

Catalogue record

Date deposited: 08 Jan 2008
Last modified: 17 Jul 2017 14:54

Export record

Altmetrics

Contributors

Author: O. Friedrich
Author: K.J.S. Meier

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×