A strong temperature effect on U/Ca in planktonic foraminiferal carbonates

Yu, J. and Elderfield, H. and Jin, Z. and Booth, L. (2008) A strong temperature effect on U/Ca in planktonic foraminiferal carbonates. Geochimica Et Cosmochimica Acta, 72 (20). pp. 4988-5000. ISSN 0016-7037 DOI 10.1016/j.gca.2008.07.011

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Abstract

Three planktonic foraminiferal species Globigerina bulloides, Neogloboquadrina pachyderma (d), and Globorotalia inflata collected from core-tops spanning 35° to 65°N in the North Atlantic were used for U/Ca and Mg/Ca and foraminiferal shell weight analyses. Except for U/Ca in G. bulloides calcified under warm conditions (>not, vert, similar13 °C), U/Ca ratios in all three studied species increase with decreasing latitude and show strong positive correlations with Mg/Ca ratios. A dissolution effect on planktonic U/Ca is suggested by decreased shell weight and U/Ca and Mg/Ca ratios for shells from very deep water depth (>4.4 km) along the latitudinal transect. G. bulloides from down core samples in the North Atlantic show low U/Ca ratios during the last glacial and high ratios during the Holocene, similar to the Mg/Ca evolution trend. In general, our data indicate that the U incorporation into planktonic foraminiferal carbonates is strongly influenced by calcification temperature, although U/Ca in G. bulloides may be affected by seawater carbonate ion concentration under warm conditions and/or other factors.

Item Type: Article
Uncontrolled Keywords: 08AREP IA57 2008 P
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Geochimica Et Cosmochimica Acta
Volume: 72
Page Range: pp. 4988-5000
Identification Number: 10.1016/j.gca.2008.07.011
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:04
Last Modified: 23 Jul 2013 09:54
URI: http://eprints.esc.cam.ac.uk/id/eprint/824

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