Isotopic measurements of 3 foraminifer species from ODP Hole 171-1050C

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 isoto...

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Bibliographic Details
Main Authors: Isaza-Londoño, Carolina, MacLeod, Kenneth G, Huber, Brian T
Format: Dataset
Language:English
Published: PANGAEA 2006
Subjects:
171-1050C
Blake Nose
North Atlantic Ocean
Contusotruncana contusa
δ13C
δ18O
DEPTH
sediment/rock
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Isotope ratio mass spectrometry
Joides Resolution
Leg171B
Ocean Drilling Program
ODP
Racemiguembelina fructicosa
Rugoglobigerina rugosa
Sample code/label
Sea surface temperature
North Atlantic
Planktonic foraminifera
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.742669
https://doi.org/10.1594/PANGAEA.742669
Description
Summary: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.

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