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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Noble gas abundances in a deep-sea sediment core from eastern equatorial Pacific

Jun-ichi Matsuda, Keisuke Nagao
Geochemical Journal, Vol. 20, No. 2, P. 71-80, 1986


The dried sediments from a single deep-sea sediment core taken in the eastern equatorial Pacific (1°02.2′N, 121°10.4′W), showed progressive enrichment in heavy noble gases (36Ar, 84Kr, 132Xe). Meanwhile, light noble gases (4He, 20Ne), especially 20Ne, were severely depleted. The noble gas abundances classified into type 1, observed in terrestrial sedimentary rocks and natural gases, can be formed as a mixture of the observed noble gas abundances with those in water. The concentrations of 84Kr and 132Xe show no systematic variation with depth, and correlated directly with the SiO2 content and inversely with the CaCO3 content. Leaching experiments to remove CaCO3 confirmed that siliceous fossils were better adsorbers of heavy noble gases than calcareous fossils. Very high 3He/4He ratios of 0.7 × 10-4 and 1.3 × 10-4 were observed in these leached samples.

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