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Origin of Argon-Lead Isotopic Correlation in Basalts

Burnard, P. G. (1999) Origin of Argon-Lead Isotopic Correlation in Basalts. Science, 286 (5441). p. 871. ISSN 0036-8075. doi:10.1126/science.286.5441.871a.

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Sarda et al. (1) show that there is a correlation between ^(206)Pb/^(204)Pb and maximum ^(40)Ar/^(36)Ar values in Atlantic basalts. The authors argue that this correlation is due to mixing between a degassed-depleted upper mantle (^(40)Ar/^(36)Ar > 40,000 and ^(206)Pb/^(204)Pb ≈ 17.8) and a recycled component in the mantle (HIMU) that has unradiogenic Ar resulting from recycling of atmospheric Ar (^(40)Ar/^(36)Ar = 300). However, devolatilization of subducting material is well documented in arc environments and it seems extraordinary that Ar, a highly volatile element, can be recycled in significant amounts. I aim to show that the Ar content required of the recycled slab is implausibly high and that most of the variation in Ar isotopic composition could be the result of shallow-level atmospheric contamination.

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Additional Information:© 1999 American Association for the Advancement of Science.
Issue or Number:5441
Record Number:CaltechAUTHORS:20141124-100857980
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52092
Deposited By: Tony Diaz
Deposited On:24 Nov 2014 21:28
Last Modified:10 Nov 2021 19:20

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