He-3/He-4 ratios of marine ferromanganese nodules

Details He-3/He-4 ratios of marine ferromanganese nodules He-3/He-4 ratios of marine ferromanganese nodules

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.317..518s&link_type=abstract

Nature (ISSN 0028-0836), vol. 317, Oct. 10, 1985, p. 518-520.

Computer Science

1

Extraterrestrial Matter, Helium Isotopes, Hydrogeology, Marine Chemistry, Nodules, Argon, Iron, Manganese

Scientific paper

New helium isotope data are presented for ten marine ferromanganese nodules, together with isotope compositions for Ar and chemical compositions. The observed He-3/He-4 ratios are extraordinarily high, with values up to 59.3 x 10 to the -6th. Considering that the direct supply of materials from the deep mantle is an insignificant factor in the area studied, that contribution of radiogenic He-3 is negligible, and that artificial nuclear fallout debris is improbable, the most likely explanation seems to be agglomeration of extraterrestrial matter. Abundances of radiogenic Ar-40 are related to the genetic environments of nodules (i.e., diagenetic or hydrogenetic) as characterized by their chemical compositions.

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