Rare gases and Cl-36 in stony-iron meteorites - Cosmogenic elemental production rates, exposure ages, diffusion losses and thermal histories

Details Rare gases and Cl-36 in stony-iron meteorites - Cosmogenic elemental production rates, exposure ages, diffusion losses and thermal histories Rare gases and Cl-36 in stony-iron meteorites - Cosmogenic elemental production rates, exposure ages, diffusion losses and thermal histories

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..353b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Mar. 1976, p. 353-368.

Mathematics

Logic

32

Chlorine, Iron Meteorites, Meteoritic Composition, Rare Gases, Stony Meteorites, Stony-Iron Meteorites, Argon Isotopes, Cosmic Rays, Helium Isotopes, Neon Isotopes, Radiation Dosage

Scientific paper

Metal and silicate portions from 13 mesosiderites, one pallasite, and Bencubbin and Udei Station specimens have been analyzed for their content of He, Ne and Ar; in most cases Cl-36 could be determined as well. Cl-36 - Ar-36 cosmic ray exposure ages fall between 10 and 160 M yr. Half of the metal samples show a deficit of spallogenic He-3 which is ascribed to a loss of tritium. The observed depletion in the silicates is correlated with their mineralogical composition: feldspar has lost its He-3 in all cases, pyroxene definitely in one and possibly in five others, while olivine has been affected in only two meteorites. With the exception of Veramin, the data are compatible with the assumption of a continuous diffusion loss during a considerable fraction of the exposure era. For Veramin, an episodic event late in the exposure history is required. The production rates of Ar-38.39 from Ca and of Ne-21.22 from Mg are given. Of the mesosiderites only Veramin shows unambiguous evidence for primordial rare gases. In situ fractionation appears to have at least been partly responsible for the abundance pattern found. Bencubbin contains large amounts of strongly fractionated primordial gases, but again part of the fractionation may have occurred in situ.

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