Isotopic measurements of 3 foraminifer species from ODP Hole 171-1050C, supplement to: Isaza-Londoño, Carolina; MacLeod, Kenneth G; Huber, Brian T (2006): Maastrichtian North Atlantic warming, increasing stratification, and foraminiferal paleobiology at three timescales. Paleoceanography, 21(1), PA1012

DOI

Analysis of 944 single specimens of three species of late Maastrichtian planktonic foraminifera (Racemiguembelina fructicosa, Contusotruncana contusa, and Rugoglobigerina rugosa) from 38 samples spanning the last 3 Myr of the Cretaceous shows consistent isotopic trends through time, consistent isotopic differences among taxa, and high within-sample isotopic variability throughout. Within-sample variability does not change systematically through time for any taxon, but average d18O values decrease by approx. 1.5 per mill, and average d13C values diverge up section. Comparing taxa, average d18O values are similar within most samples, but average d13C values generally decrease from R. fructicosa to R. rugosa to C. contusa. In addition, the within-sample variability of individual d13C measurements is larger for R. fructicosa than for either C. contusa or R. rugosa, an observation which is consistent with a photosymbiotic habitat for R. fructicosa. In terms of Maastrichtian paleoceanography the negative d18O trend of approx. 1.5 per mill corresponds to a temperature increase of approx. 6°C, and the divergence of d13C values up section suggests an increasingly stratified water column in the western Atlantic through the late Maastrichtian. We suggest that these trends are best explained by increasing import of South Atlantic waters into the North Atlantic and an intensification of the Northern Hemisphere polar front.

Identifier
DOI http://dx.doi.org/doi:10.1594/PANGAEA.742669
Metadata Access http://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite3&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.742669
Provenance
Creator Isaza-Londoño, Carolina;Huber, Brian T;MacLeod, Kenneth G
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2006
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Representation
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Discipline Earth System Research
Spatial Coverage (30N,76W)
Temporal Point 1997-02-08T11:59:59Z