Fission track age and cooling rate of the Marjalahti pallasite

Details Fission track age and cooling rate of the Marjalahti pallasite Fission track age and cooling rate of the Marjalahti pallasite

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..319p&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 64, no. 3, Sept. 1983, p. 319-326. Research supported by the Institut

Astronomy and Astrophysics

Astronomy

4

Iron Meteorites, Meteoritic Composition, Particle Tracks, Radioactive Age Determination, Stony Meteorites, Abundance, Cosmic Rays, Crystals, Fission, Olivine, Uranium, Meteorites, Pallasites, Marjalahti, Cooling Rate, Ages, Nuclear Tracks, Fission, Olivine, Merrillite, Whitlockite, Plutonium, Fractionation, Temperature, Metallography, Thermal History, Stony-Iron Meteorites, Data, Chronology, Experiments, Cosmic Rays, Density, Uranium, Concentrations, Thermal Effects, Phosphates

Scientific paper

Nuclear tracks were studied in olivine and merrillite (phosphate previously called whitlockite) from the Marjalahti pallasite. The merrillite contains an important fission contribution due mainly to the spontaneous decay of now extinct Pu-244. The U contents of 29 merrillite grains range from 60 to 140 ppb (median value: 85 ppb). Assuming a reasonable fractionation temperature of about 1750 K for the pre-pallasitic material, a lower limit of about 5 K/Myr is obtained for the cooling rate, in strong contrast with the previous metallographic result (about 0.5 K/Myr). This disagreement, together with those observed in the case of mesosiderites, strengthens the need for a revision of the metallographic method of retracing the cooling histories of meteorites, as suggested by Narayan and Goldstein (1982).

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