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Observation of High 3He/4He Ratio in Ocean Sediments — Evidence for Extraterrestrial Material Contamination

Published online by Cambridge University Press:  12 April 2016

M. Ozima ,
M. Takayanagi ,
S. Zashu  and
S. Amari
M. Ozima
Affiliation:
Geophysical Institute, University of Tokyo, Tokyo 113, Japan
M. Takayanagi
Affiliation:
Geophysical Institute, University of Tokyo, Tokyo 113, Japan
S. Zashu
Affiliation:
Geophysical Institute, University of Tokyo, Tokyo 113, Japan
S. Amari
Affiliation:
Geophysical Institute, University of Tokyo, Tokyo 113, Japan

Abstract

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Occurrence of anomalously high 3He/4He ratio (> 5 × 10−5) is rather common in the Pacific deep sea sediment. The 3He/4He ratio correlates well with the 3He content, whereas the 3He content shows approximate inverse relation with the sedimentation rate. Input of stratospheric dust of about 1 ppm or less which corresponds to about 2000 ton/y fallout rate can explain the above observation.

Type
III. Interplanetary Dust: Laboratory Studies
Information
International Astronomical Union Colloquium , Volume 85: Properties and Interactions of Interplanetary Dust , 1985 , pp. 185 - 189
Copyright
Copyright © Reidel 1985

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