EarthRef.org Reference Database (ERR) -- Sarda et al. 1999

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Sarda et al. 1999

Sarda, P., Moreira, M. and Staudacher, T. (1999). Argon-lead isotopic correlation in Mid-Atlantic Ridge basalts. Science 283(5402): 666-668.

Step-heating analyses for Mid-Atlantic Ridge glass samples show that maximum Ar-40/Ar-36 values correlate with Pb-206.207.208/Pb-204. These correlations hold for the whole Atlantic Ocean and therefore are unlikely to result from shallow-level contamination processes. Instead, they are taken as mixing hyperbolae between the degassed-depleted upper mantle and a recycled component characterized by high Pb-206/Pb-204 ratios (19 to 21) and Low Ar-40/Ar-36 ratios (300 to 1000). These relations imply that argon may also be a tracer of mantle recycling.

BACKGROUND DATA FILES

	Abstract

Keywords
south-atlantic, mantle evolution, noble-gases, pb isotope, glasses, geochemistry, constraints, helium, sr, heterogeneity

Journal
Science
http://www.sciencemag.org/

Publisher
American Association for the Advancement of Science
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