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G-Cubed: Geochemistry, Geophysics, Geosystems

 

Keywords

  • foraminifera
  • stronium
  • Sr/Ca
  • paleothermometry
  • geochemical cycling

Index Terms

  • Oceanography: General: Paleoceanography
  • Geochemistry: Marine geochemistry
  • Geochemistry: Trace elements
Abstract
Cited By (22)
 

Abstract

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, VOL. 1, NO. 12, 1004, 19 PP., 1999
doi:10.1029/1999GC000006 [Citation]

Variation of foraminiferal Sr/Ca over Quaternary glacial-interglacial cycles: Evidence for changes in mean ocean Sr/Ca?

P. A. Martin

Department of Geological Sciences and the Marine Sciences Institute, University of California, Santa Barbara, California 93106, USA

D. W. Lea

Department of Geological Sciences and the Marine Sciences Institute, University of California, Santa Barbara, California 93106, USA

T. A. Mashiotta

Department of Geological Sciences and the Marine Sciences Institute, University of California, Santa Barbara, California 93106, USA

T. Papenfuss

Geologisch-Palaeontologisches Institut, Universität Kiel, Olshausenstrasse 40, D-2300 Kiel, Germany

M. Sarnthein

Geologisch-Palaeontologisches Institut, Universität Kiel, Olshausenstrasse 40, D-2300 Kiel, Germany

Records of Sr/Ca changes in planktonic and benthic foraminifera from diverse hydrographic settings reveal coherent variability (5 ± 1%) between ocean basins and between surface and deep waters over the past 300 kyr. There is a general increase in foraminiferal Sr/Ca over the penultimate glaciation declining to minimum values during stage 5 and an increase in Sr/Ca from stage 5 through stage 2. Coincident changes in benthic foraminifera records from the Atlantic and Pacific basins imply that Sr/Ca variations are not dominated by dissolution. Planktonic culturing data provide evidence that the downcore Sr/Ca variations are not controlled by temperature changes and suggest only a small influence of salinity and pH. Variation common to the records is most readily explained by changes in mean ocean Sr/Ca. If fossil foraminifera reliably record higher glacial seawater Sr/Ca, coral Sr paleothermometry would underestimate sea surface temperature during glacialepisodes.

Received 29 May 1999; accepted 15 November 1999; published 30 December 1999.

Citation: Martin, P. A., D. W. Lea, T. A. Mashiotta, T. Papenfuss, and M. Sarnthein (1999), Variation of foraminiferal Sr/Ca over Quaternary glacial-interglacial cycles: Evidence for changes in mean ocean Sr/Ca?, Geochem. Geophys. Geosyst., 1(12), 1004, doi:10.1029/1999GC000006.

Cited By

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