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Lead isotopes and selected metals in ice from Law Dome, Antarctica

  • K.J. R. Rosman (a1), W. Chisiiolm (a1), C. F. Boutron (a2), S. Hong (a2), R. Edwards (a3), Vin Morgan (a4) (a5) and P. N. Sedwick (a4)...

Abstract

The isotopic composition of Pb and the concentrations of Pb, Ba and Bi wert- measured in selected ice-core samples from Law Dome, East Antarctica, to a depth of 1196 m. The range of concentrat ions found in decontaminated ice was 0.03-1.5 pgg−1 for Pb, 0.9-6.1 pgg−1 for Ba and 0.4 17 fgg −1 for Bi, excluding the deepest sample which contained ~1 pjpm of rock dust. The abundances of all four stable lead isotopes were measured and gave 206Pb/207Pb ratios up to ~1.23. Avalue of 208Pb/207Pb= 2.78 was measured in the deepest sample and is consistent with reported Pb isotope ratios of Antarctic gran-ulites. Although the element concentrations in some samples were lower than have been reported elsewhere, geochemkal and isotopic evidence indicated that a number of samples were contaminated with Pb not present in the original ice. However, it appears that the technical skills now available are approaching the level where careful sample selection, decontamination and analysis can yield accurate results for the concentration and isotopic composition of Pb in Earth's purest naturally occurring ice.

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References

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Annals of Glaciology
  • ISSN: 0260-3055
  • EISSN: 1727-5644
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