Titre du document / Document title
Lead from Carthaginian and Roman Spanish mines isotopically identified in Greenland ice dated from 600 B.C. to 300 A.D.
Auteur(s) / Author(s)
ROSMAN K. J. R. (1) ;
CHISHOLM W. (1) ;
HONG S. (2) ;
CANDELONE J.-P. (2) ;
BOUTRON C. F. (2) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Department of Applied Physics, Curtin University of Technology, GPO Box U 1987, Perth, WA 6845, AUSTRALIE
(2) Laboratoire de Glaciologie et Géophysique de l'Environment du CNRS, 54 rue Molière, Domaine Universitaire, BP 96, 38402 St Martin d'Hères, FRANCE
Résumé / Abstract
The pollution history of the atmosphere of the Northern Hemisphere is recorded in the levels of heavy metal impurities in Greenland ice. The possibility also exists of using natural variations in the abundances of lead isotopes to trace the source of this pollution. Lead isotopes have now been measured in ancient Greenland ice with a lead concentration as low as 0.9 pg/g. The results show a depression in the
206Pb/
207Pb ratio between 600 B.C. and 300 A.D., giving unequivocal evidence of early large-scale atmospheric pollution by this toxic metal. This ratio changes from ∼1.201 in ∼8-kyr-old ice to ∼1.183 about 2 kyr ago. Isotopic systematics point to the mining districts in southwest and southeast Spain as the dominant sources of this lead, giving quantitative evidence of the importance of these mining districts to the Carthaginian and Roman civilizations. Lead with a Rio Tinto-type signature represents ∼70% of the lead found in Greenland ice between ∼150 B.C. and 50 A.D. after correcting for the contribution from rock dust indexed to aluminium concentrations.
Revue / Journal Title
Environmental science & technology
ISSN
0013-936X
CODEN ESTHAG
Source / Source
1997, vol. 31, n
o12, pp. 3413-3416 (26 ref.)
Langue / Language
Anglais
Editeur / Publisher
American Chemical Society, Washington, DC, ETATS-UNIS
(1967)
(Revue)
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Localisation / Location
INIST-CNRS, Cote INIST : 13615, 35400007964472.0150
Nº notice refdoc (ud4) : 2099549
