AustralieFrV1, Istex, Corpus, bibRecord, 002D32

Isotopic evidence to account for changes in the concentration of lead in Greenland snow between 1960 and 1988

Identifieur interne : 002D32 ( Istex/Corpus ); précédent : 002D31; suivant : 002D33

Isotopic evidence to account for changes in the concentration of lead in Greenland snow between 1960 and 1988

Auteurs : K. J. R. Rosman ; W. Chisholm ; C. F. Boutron ; J. P. Candelone ; S. Hong

Source :

Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 1994.

RBID : ISTEX:F0779A981B435A5895652BDAC4BA60573B011FA6

English descriptors

Abstract

Abstract: Preserved layers of snow deposited between 1960 and 1988, taken from 10.7 m and 70 m snow cores drilled at Summit in central Greenland in 1989, were analyzed for lead isotopes (206Pb207Pb, 208Pb207Pb, and 206Pb204Pb). The lead has an isotopic composition consistent with a mixture of USA and Eurasian origins. Although the 206Pb207Pb ratio fluctuates, presumably due to seasonal changes in the weather patterns, there is a clear trend in values from about 1.16 in the early 1960s to 1.18 by 1976, then back to the initial value by the mid 1980s. The initial trend upwards reflects the progressive introduction of relatively radiogenic Mississippi Valley-type lead into USA gasoline during the 1960s, while the return to lower values indicates a decreased contribution from this source due to the switch to unleaded gasoline for motor vehicles. Eurasian lead, assumed to be the second component of the mixture, appears to have a relatively constant 206Pb207Pb ratio over this period.

Url:

https://api.istex.fr/document/F0779A981B435A5895652BDAC4BA60573B011FA6/fulltext/pdf

DOI: 10.1016/0016-7037(94)90054-X

Links to Exploration step

ISTEX:F0779A981B435A5895652BDAC4BA60573B011FA6

Le document en format XML

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<front><div type="abstract" xml:lang="en">Abstract: Preserved layers of snow deposited between 1960 and 1988, taken from 10.7 m and 70 m snow cores drilled at Summit in central Greenland in 1989, were analyzed for lead isotopes (206Pb207Pb, 208Pb207Pb, and 206Pb204Pb). The lead has an isotopic composition consistent with a mixture of USA and Eurasian origins. Although the 206Pb207Pb ratio fluctuates, presumably due to seasonal changes in the weather patterns, there is a clear trend in values from about 1.16 in the early 1960s to 1.18 by 1976, then back to the initial value by the mid 1980s. The initial trend upwards reflects the progressive introduction of relatively radiogenic Mississippi Valley-type lead into USA gasoline during the 1960s, while the return to lower values indicates a decreased contribution from this source due to the switch to unleaded gasoline for motor vehicles. Eurasian lead, assumed to be the second component of the mixture, appears to have a relatively constant 206Pb207Pb ratio over this period.</div>
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<abstract xml:lang="en"><p>Preserved layers of snow deposited between 1960 and 1988, taken from 10.7 m and 70 m snow cores drilled at Summit in central Greenland in 1989, were analyzed for lead isotopes (206Pb207Pb, 208Pb207Pb, and 206Pb204Pb). The lead has an isotopic composition consistent with a mixture of USA and Eurasian origins. Although the 206Pb207Pb ratio fluctuates, presumably due to seasonal changes in the weather patterns, there is a clear trend in values from about 1.16 in the early 1960s to 1.18 by 1976, then back to the initial value by the mid 1980s. The initial trend upwards reflects the progressive introduction of relatively radiogenic Mississippi Valley-type lead into USA gasoline during the 1960s, while the return to lower values indicates a decreased contribution from this source due to the switch to unleaded gasoline for motor vehicles. Eurasian lead, assumed to be the second component of the mixture, appears to have a relatively constant 206Pb207Pb ratio over this period.</p>
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<ce:note-para>Paper presented at the symposium “Topics in Global Geochemistry” in honor of Clair C. Patterson on 3–4 December 1993 in Pasadena, California, USA.</ce:note-para>
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<ce:textfn>Laboratoire de Glaciologie et Géophysique de l'Environnement du CNRS, 54 rue Molière, Domaine Universitaire, BP 96, 38402 St Martin d'Hères Cedex, France</ce:textfn>
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<ce:abstract-sec><ce:simple-para>Preserved layers of snow deposited between 1960 and 1988, taken from 10.7 m and 70 m snow cores drilled at Summit in central Greenland in 1989, were analyzed for lead isotopes (<math altimg="si1.gif"><fr shape="sol"><nu><sup>206</sup>
Pb</nu>
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Pb</de>
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, <math altimg="si2.gif"><fr shape="sol"><nu><sup>208</sup>
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Pb</de>
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Pb</nu>
<de><sup>204</sup>
Pb)</de>
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. The lead has an isotopic composition consistent with a mixture of USA and Eurasian origins. Although the <math altimg="si4.gif"><fr shape="sol"><nu><sup>206</sup>
Pb</nu>
<de><sup>207</sup>
Pb</de>
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 ratio fluctuates, presumably due to seasonal changes in the weather patterns, there is a clear trend in values from about 1.16 in the early 1960s to 1.18 by 1976, then back to the initial value by the mid 1980s. The initial trend upwards reflects the progressive introduction of relatively radiogenic Mississippi Valley-type lead into USA gasoline during the 1960s, while the return to lower values indicates a decreased contribution from this source due to the switch to unleaded gasoline for motor vehicles. Eurasian lead, assumed to be the second component of the mixture, appears to have a relatively constant <math altimg="si5.gif"><fr shape="sol"><nu><sup>206</sup>
Pb</nu>
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Pb</de>
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<abstract lang="en">Abstract: Preserved layers of snow deposited between 1960 and 1988, taken from 10.7 m and 70 m snow cores drilled at Summit in central Greenland in 1989, were analyzed for lead isotopes (206Pb207Pb, 208Pb207Pb, and 206Pb204Pb). The lead has an isotopic composition consistent with a mixture of USA and Eurasian origins. Although the 206Pb207Pb ratio fluctuates, presumably due to seasonal changes in the weather patterns, there is a clear trend in values from about 1.16 in the early 1960s to 1.18 by 1976, then back to the initial value by the mid 1980s. The initial trend upwards reflects the progressive introduction of relatively radiogenic Mississippi Valley-type lead into USA gasoline during the 1960s, while the return to lower values indicates a decreased contribution from this source due to the switch to unleaded gasoline for motor vehicles. Eurasian lead, assumed to be the second component of the mixture, appears to have a relatively constant 206Pb207Pb ratio over this period.</abstract>
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Isotopic evidence to account for changes in the concentration of lead in Greenland snow between 1960 and 1988

Isotopic evidence to account for changes in the concentration of lead in Greenland snow between 1960 and 1988

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