The University of Southampton
University of Southampton Institutional Repository

Early Maastrichtian carbon cycle perturbation and cooling event: implications from the South Atlantic Ocean

Friedrich, Oliver, Herrle, Jens O., Wilson, Paul A., Cooper, Matthew J., Erbacher, Jochen and Hemleben, Christoph (2009) Early Maastrichtian carbon cycle perturbation and cooling event: implications from the South Atlantic Ocean Paleoceanography, 24, PA2211. (doi:10.1029/2008PA001654).

Record type: Article


Published stable isotope records in marine carbonate are characterized by a positive ?18O excursion associated with a negative ?13C shift during the early Maastrichtian. However, the cause and even the precise timing of these excursions remain uncertain. We have generated high-resolution foraminiferal stable isotope and grey scale records for the latest Campanian to early Maastrichtian (~73-68 Ma) at two Ocean Drilling Program sites, 525 (Walvis Ridge) and 690 (Weddell Sea). We demonstrate that the negative ?13C excursion is decoupled from the ?18O increase with a lag of about 600 kyr. Our ?13C records (both planktic and benthic) show an amplitude for the negative excursion of 0.7 ‰ that falls between about 72.1 and 70.7 Ma. Our planktic ?18O records indicate an overall increase of 1.2 ‰ from 73 to 68 Ma at Site 690, whereas at Site 525 they record a slightly smaller increase (~1 ‰) that peaks around 70.1 Ma with decreasing values thereafter. Our benthic ?18O data indicate an increase of ~1.5 ‰ at Site 525 and ~0.7 ‰ at Site 690 between about 71.4 and 69.9 Ma. Benthic ?18O values show different baseline values at the two sites before and after the excursion but the larger increase at Site 525 means that the values attained at the peak of the excursion are similar at the two sites. We interpret this observation in terms of water mass changes. The excursion is interpreted to reflect a cooling of bottom waters in response to the strengthening contribution of intermediate- to deep-water production in the high southern latitudes rather than increased ice volume. The associated carbon-cycle perturbations that we observe are interpreted to reflect a weakening of surface-water stratification and increased productivity, as supported by our grey value data.

PDF 2008PA001654-pip.pdf - Author's Original
Restricted to Registered users only
Download (920kB)

More information

Published date: 27 May 2009


Local EPrints ID: 65737
ISSN: 0883-8305
PURE UUID: b088b03c-bc90-4fea-bb7e-49deb3854d49
ORCID for Matthew J. Cooper: ORCID iD

Catalogue record

Date deposited: 19 Mar 2009
Last modified: 19 Jul 2017 00:31

Export record



Author: Oliver Friedrich
Author: Jens O. Herrle
Author: Paul A. Wilson
Author: Jochen Erbacher
Author: Christoph Hemleben

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 supports OAI 2.0 with a base URL of

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.