Search for the origin of exotic helium in deep-sea sediments

Details Search for the origin of exotic helium in deep-sea sediments Search for the origin of exotic helium in deep-sea sediments

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.317..520a&link_type=abstract

Nature (ISSN 0028-0836), vol. 317, Oct. 10, 1985, p. 520-522.

Computer Science

22

Helium Isotopes, Hydrogeology, Interplanetary Dust, Marine Chemistry, Sediments, Degassing, High Temperature Tests, Magnetite

Scientific paper

Deep-sea pelagic sediments from three different sites are studied to characterize exotic He and identify its carrier. Exotic He is helium with a very high ratio of He-3 to He-4. It is confirmed that the exotic He resides mainly in a strongly magnetic fraction. Stepwise degassing experiments suggest that the exotic He consists of a single component. The carrier is likely to be chondritic interplanetary dust particles (IDPs). The higher level of exotic He in magnetic fractions of sediments can be explained by secondarily produced magnetite in IDPs as a result of thermal shock during atmospheric entry.

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