10.1594/PANGAEA.742669
Isaza-Londoño, Carolina
Carolina
Isaza-Londoño
MacLeod, Kenneth G
Kenneth G
MacLeod
0000-0002-6016-0837
Huber, Brian T
Brian T
Huber
0000-0002-0929-3175
Isotopic measurements of 3 foraminifer species from ODP Hole 171-1050C
PANGAEA
2006
Sample code/label
DEPTH, sediment/rock
Racemiguembelina fructicosa, δ13C
Racemiguembelina fructicosa, δ18O
Contusotruncana contusa, δ13C
Contusotruncana contusa, δ18O
Rugoglobigerina rugosa, δ13C
Rugoglobigerina rugosa, δ18O
Sea surface temperature
Drilling/drill rig
DSDP/ODP/IODP sample designation
Isotope ratio mass spectrometry
Leg171B
Joides Resolution
Ocean Drilling Program (ODP)
1997-02-08T19:30:00
en
Supplementary Dataset
10.1029/2004PA001130
3776 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
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.
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
-76.23497
30.09991
Blake Nose, North Atlantic Ocean