Neon measurements of individual Greenland sediment particles - Proof of an extraterrestrial origin and comparison with EDX and morphological analyses

Details Neon measurements of individual Greenland sediment particles - Proof of an extraterrestrial origin and comparison with EDX and morphological analyses Neon measurements of individual Greenland sediment particles - Proof of an extraterrestrial origin and comparison with EDX and morphological analyses

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl.100...77o&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 100, no. 1-3, Oct. 1990, p. 77-93.

Mathematics

Logic

28

Extraterrestrial Matter, Isotopes, Micrometeorites, Sediment Transport, Glaciers, Greenland, Lakes, Neon, Sediments

Scientific paper

The work reported here confirms the existence of (largely) unmelted micrometeorites in sediments from seasonal lakes on the Greenland ice sheet. Approximately one third of the dark and irregularly shaped particles selected from disaggregated sediments had sufficient contents of Ne to permit measurement of isotopic compositions. The sediments consisted of a mixture of biologically derived contaminants and minor amounts of terrestrial minerals and extraterrestrial fragments. Although terrestrial mineral contamination varied by a factor of 20 for the two different sediments, a yield of about 1000 cosmic particles/kg of wet cryoconite was found for both samples. The isotopic compositions of the Ne in both rounded and irregular (25 percent of total) particles that contained enough gas to measure were non-terrestrial, plotting in a field defined by solar wind, solar energetic particle and spallation. Exposure ages ranged from less than 0.5 Ma to 20 Ma, consistent with previous estimates from Be-10 and Al-26 measurements of larger spherules removed from similar sediments.

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