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New high-precision measurements of the isotopic composition of atmospheric argon,

Mark, D F*; Stuart, F M*; de Podesta, M (2011) New high-precision measurements of the isotopic composition of atmospheric argon,. Geochim. Cosmochim. Acta, 75 (23). pp. 7494-7501.

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Abstract

Atmosphere is used as a standard reference gas for mass spectrometric determinations of argon (Ar) isotopes used principally in geochronology. There are three independent determinations of the Ar isotope composition of modern atmosphere. We have made high precision measurements of Ar isotope ratios of four different sources of air using a high-sensitivity multi-collector noble gas mass spectrometer (ARGUS V) in order to distinguish between them. The isotope ratios, corrected only for backgrounds, reside on a root mass law fractionation line that passes through the air value proposed by Lee, J.Y., Marti, K., Severinghaus, J.P., Kawamura, K., Yoo, H.S., Lee, J.B., Kim, J.S. [2006. A redetermination of the isotopic abundances of atmospheric Ar. Geochimica et Cosmochimica Acta, 70, 4507-4512], and are distinct from both other values. This is the first independent confirmation of the atmospheric Ar isotope composition, and we suggest the revised values should now be routinely employed.

Item Type: Article
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1016/j.gca.2011.09.042
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5309

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