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doi:10.2204/iodp.proc.303306.216.2013

Data report: oxygen isotopes and foraminifer abundance record for the last glacial–interglacial cycle and marine isotope Stage 6 at IODP Site U13131

M.E. Smith,2 E.V. Glick,2 S. Lodestro,3 and H. Rashid2,4

Abstract

We determined oxygen isotope ratios (δ18O) of the mixed layer–dwelling planktonic foraminifer Globigerina bulloides and relative abundance of Neogloboquadrina pachyderma (sinistral) for the last glacial–interglacial cycle, including marine isotope Stage (MIS) 6 from Integrated Ocean Drilling Program Site U1313. The δ18O data in G. bulloides allowed us to construct an age model. Changes in relative abundance of N. pachyderma (s) were compared to the δ18O of G. bulloides. We also performed a detailed quantitative study of four planktonic foraminiferal species to assess surface to near-surface oceanographic changes for the period between MIS 5e and 6 (120–180 ka), including the penultimate glacial termination (TII). Analyses of the relative abundances of four planktonic foraminiferal species lead us to reconstruct the variability in the upper water masses of the North Atlantic at this subtropical site. We found clear indications of freshwater inputs, including a Heinrich iceberg-rafting event (H11), which provided a mechanism for freshening the sea surface and perturbing climate conditions.

1 Smith, M.E., Glick, E.V., Lodestro, S., and Rashid, H., 2013. Data report: oxygen isotopes and foraminifer abundance record for the last glacial–interglacial cycle and marine isotope Stage 6 at IODP Site U1313. In Channell, J.E.T., Kanamatsu, T., Sato, T., Stein, R., Alvarez Zarikian, C.A., Malone, M.J., and the Expedition 303/306 Scientists, Proc. IODP, 303/306: College Station, TX (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.303306.216.2013

2 School of Earth Sciences, Ohio State University, Columbus OH 43210, USA.

3 Eckerd College, St. Petersburg FL 33711, USA.

4 Also at: Memorial University of Newfoundland, 20 University Drive, Corner Brook, NL A2H 6P9, Canada. hrashid@grenfell.mun.ca

Initial receipt: 27 November 2012
Acceptance: 6 June 2013
Publication: 30 August 2013
MS 303306-216