Noble gases in basalt glasses from a Mid-Atlantic Ridge topographic high at 14°N: geodynamic consequences

Details Noble gases in basalt glasses from a Mid-Atlantic Ridge topographic high at 14°N: geodynamic consequences Noble gases in basalt glasses from a Mid-Atlantic Ridge topographic high at 14°N: geodynamic consequences

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..96..119s&link_type=abstract

Earth and Planetary Science Letters, Volume 96, Issue 1-2, p. 119-133.

Computer Science

82

Scientific paper

We present a complete noble gas study of mid-oceanic ridge basalt glasses (MORB) from a small ridge segment, centered on an along-strike topographic elevation of the Mid-Atlantic Ridge at about 14°N. We have found the highest 40Ar/36Ar ratio ever observed for a MORB glass, i.e. 28,150 +/- 330 for sample 2ΠD40, correlated with high 129Xe/130Xe ratios and the highest noble gas concentrations in a so-called popping-rock, labeled 2ΠD43. The latter sample displays a 4He/40Ar* ratio of 2.0-2.7, which is close to the production ratio in the mantle due to the radioactive decay of U, Th and K. Hence, this sample probably best represents the elemental noble gas ratios in the mantle, from which we have computed the 4He concentration in the mantle source of MORB to be 1.5 × 10-5 cm3 STP g-1. High 4He/3He ratios in two of the samples from the summit of the topographic high indicate the presence of a U, Th-rich component in the mantle source, possibly old subducted oceanic crust and/or sediments, which could originate in the so-called mesosphere boundary layer.

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