Physics
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..665k&link_type=abstract
Meteoritics & Planetary Science, vol. 33, no. 4, pp. 665-670.
Physics
4
Scientific paper
The enrichment of fluorine on Antarctic meteorites is the result of their exposure to the atmosphere and its measurement allows to subdivide the terrestrial age into a duration of exposure on the ice and the time meanwhile a meteorite was enclosed by the ice. In many cases, the periods of surface exposure are only small fractions of the terrestrial ages of meteorites collected in Antarctica. The enrichment of fluorine on the surfaces of Antarctic achondrites was investigated by means of Nuclear Reaction Analysis (NRA): Scanning proton beams with an energy of 2.7 and 3.4 MeV were used to induce the reactions 19F(p,(()16O and 19F(p,p`()19F respectively. Gamma signals proportional to the F content were measured. Following Antarctic achondrites were investigated: Martian meteorite ALH84001, diogenite ALHA77256, the eucrites ALHA81011 and ALHA78132 and in addition H5-chondrite ALHA79025. For ALH84001, our data indicate a period of exposure on the ice of less than 500 years. Thus, this specimen was enclosed in the ice more than 95% of its terrestrial age of 13000 years.
Döbeli Max
Grambole D.
Herrmann Fabian
Krohenbohl Urs
Noll Keith
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