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Climatic Control of Riverine and Seawater Uranium-Isotope Ratios

Robinson, Laura F. and Henderson, Gideon M. and Hall, Lisa and Matthews, Iain (2004) Climatic Control of Riverine and Seawater Uranium-Isotope Ratios. Science, 305 (5685). pp. 851-854. ISSN 0036-8075. doi:10.1126/science.1099673.

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The large variation in the ratio of uranium-234 to uranium-238 (^(234)U/^(238)U) in rivers is not well understood, but may provide information about past weathering and rainfall and is important because it controls seawater (^(234)U/^(238)U). Here, we demonstrate the importance of physical weathering and rainfall for (^(234)U/^(238)U), using rivers from South Island, New Zealand. These data allow interpretation of an existing speleothem (^(234)U/^(238)U) record and suggest that New Zealand glacier advance 13,000 years ago was influenced by increased rainfall rather than by Younger Dryas–like cooling. A model of seawater (^(234)U/^(238)U) during glacial cycles indicates that rejection of corals based on modern (^(234)U/^(238)U) ± <0.01 is not merited and may reject the highest quality ages.

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Additional Information:© 2004 American Association for the Advancement of Science. 27 April 2004; Accepted 7 July 2004. We thank the Gary Comer Fellowship program for financial support and N. Belshaw for help in the laboratory.
Funding AgencyGrant Number
Gary Comer FellowshipUNSPECIFIED
Issue or Number:5685
Record Number:CaltechAUTHORS:20141202-103840474
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Official Citation:Robinson, L. F., Henderson, G. M., Hall, L., & Matthews, I. (2004). Climatic Control of Riverine and Seawater Uranium-Isotope Ratios. Science, 305(5685), 851-854. doi: 10.1126/science.1099673
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52264
Deposited On:02 Dec 2014 21:14
Last Modified:10 Nov 2021 19:23

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