The Open UniversitySkip to content
 

Strontium stable isotope behaviour in foraminiferal calcite and the retrieval of marine records

Stevenson, E.; Burton, K. W.; Rickaby, R. E. M.; Parkinson, I. J.; Anand, P. and Hathorne, E. C. (2009). Strontium stable isotope behaviour in foraminiferal calcite and the retrieval of marine records. In: American Geophysical Union, Fall Meeting 2009, Dec 2009.

Google Scholar: Look up in Google Scholar

Abstract

The strontium (88Sr/86Sr) stable isotope composition of seawater preserved in sedimentary foraminifera potentially provides key information on variations in the composition of material delivered by continental weathering and on changes in carbonate productivity over time. However, recent studies suggest a significant temperature dependent fractionation of Sr stable isotopes during the precipitation of calcium carbonate, which must be quantified before seawater records can be accurately retrieved [1, 2].
This study presents high-precision stable Sr isotope data (±10 ppm; 2 s.d.) for core-top planktonic foraminifera from sites in the South Atlantic covering a sea surface temperature range of ca. 18 - 28°C, and quaternary marine foraminiferal records from the SE Indian Ocean (core ). These results indicate that there is no signficiant variation in the stable isotope composition of an individual species across the temperature range studied here, but there are resolvable differences in the offset from seawater between species. In this case, seawater stable Sr isotope records can be reconstructed without the necessity of a temperature correction. The preliminary results for a glacial-interglacial planktonic foraminiferal record indicate that there are no resolvable variations in the stable isotope ratios over this time interval, indicating that there are no significant variations in the Sr isotope composition of continental runoff or carbonate productivity in the oceans over this time interval.

[1] Fietzke, J., Eisenhauer, A. (2006), Geochem. Geophys. Geosyst., 7, (8), 1-6 . [2] Ruggerburg, A., Fietzke, J., Liebetrau, V. Eisenhauer, A., Dullo, W-C., Freiwald, A. (2008). Earth Plan. Sci. Lett. 269, 570-575

Item Type: Conference Item
Copyright Holders: 2009 AGU
Academic Unit/Department: ?? scie-easc ??
Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 26794
Depositing User: Pallavi Anand
Date Deposited: 20 Jan 2011 14:26
Last Modified: 23 Oct 2012 14:39
URI: http://oro.open.ac.uk/id/eprint/26794
Share this page:

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk