High He-3/He-4 ratio in ocean sediments

Details High He-3/He-4 ratio in ocean sediments High He-3/He-4 ratio in ocean sediments

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.311..448o&link_type=abstract

Nature (ISSN 0028-0836), vol. 311, Oct. 4, 1984, p. 448-450.

Physics

43

Cosmic Dust, Geochemistry, Helium Isotopes, Ocean Bottom, Sediments, Extraterrestrial Matter, Fallout

Scientific paper

Thirty-nine sediments from 12 different sites, 10 sites in the western to central Pacific and two sites in the Atlantic Ocean, have been examined for He-3/He-4 ratios. The ratio is found to be larger than 5 x 10 to the -5th at six sites, well above the values generally observed in common terrestrial materials. This result is probably due to the input of extraterrestrial materials. Input of stratospheric dust of 1 ppm or less, which corresponds to a fallout rate of about 2000 tons per year, can explain the observations.

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