Can one date a comet and its constituents? A note

Details Can one date a comet and its constituents? A note Can one date a comet and its constituents? A note

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ssrv...56..139t&link_type=abstract

(Analysis of samples from solar system bodies with emphasis on existing and emerging technologies; Proceedings of the Internatio

Computer Science

Emerging Technologies

2

Chronology, Comets, Solar System, Abundance, Interplanetary Dust, Mineralogy, Petrology, Radioactive Age Determination, Comets, Composition, Dating Methods, Techniques, Chronology, Isotopes, Age Dating, Technical Aspects, Radionuclides, Cosmic Rays, Laser Methods, Ion Probe Methods

Scientific paper

The present state of knowledge of the chronology of comets is discussed. It is noted that the development of remote Ar-40, Ar-39 dating, using a transuranic neutron source such as Cf-252 is possible, but would probably compromise experiments far more appropriate to rendezvous science. Based on the evidence from interstellar dust in meteorites, it is concluded that some of the constituents will probably predate the formation of the solar system. Other methods of dating include the comparison of absolute clocks with the meteorite/solar system age mark of about 4.56 Ga; the study of extinct radionuclides to gain information about the accretion and preaccretion stage; and the study of cosmic ray exposure clocks and the chronology of possible aqueous alteration products within the comet. Ion probe techniques are also discussed and a chart is provided which presents some useful numbers for dating small meteoritic samples.

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