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Vertical profile of lead isotopic compositions in the north-east Pacific

Flegal, A. R. and Itoh, K. and Patterson, C. C. and Wong, C. S. (1986) Vertical profile of lead isotopic compositions in the north-east Pacific. Nature, 321 (6071). pp. 689-690. ISSN 0028-0836. doi:10.1038/321689a0.

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Ratios of lead isotopes (^(204)Pb, ^(206)Pb, ^(207)Pb and ^(208)Pb) may be used to distinguish leads from different sources in sea water in a manner similar to neodymium isotopes. The following data from the north-east Pacific include the first vertical profile measurements of lead isotopic compositions in sea water. These preliminary data indicate that lead in offshore (48° N, 141° W) north-east Pacific surface waters (^(206)Pb/^(207)Pb = 1.164) was derived from aeolian inputs of Asian (Japanese) industrial leads (^(206)Pb/^(207)Pb = 1.160) (M. Murozumi, personal communication), but that lead in water immediately (400 m) below it (^(206)Pb/^(207)Pb = 1.211) was derived from North America industrial leads (^(206)Pb/^(207)Pb = 1.222). This remarkable contrast in isotopic compositions over such a relatively short distance reveals the potential of lead isotopic compositions to resolve the importance of horizontal transport processes on the lead cycle in the oceans, which were recently proposed to partially account for its oceanographic variability in the North Pacific.

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Additional Information:© 1986 Nature Publishing Group. Received 22 October 1985; accepted 10 March 1986.
Issue or Number:6071
Record Number:CaltechAUTHORS:20140912-152632674
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49677
Deposited By: Tony Diaz
Deposited On:12 Sep 2014 23:38
Last Modified:10 Nov 2021 18:46

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