Other
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1635e&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Nov. 1978, p. 1635-1643. Research supported by the Bundesministerium für Forschung un
Other
4
Chondrites, Manganese Isotopes, Radioactive Age Determination, Spallation, Cosmology, Geochemistry, Planetary Evolution
Scientific paper
Longlived spallogenic Mn-53 was determined in 36 individual chondrites. By combining the data with those available so far in the literature (a total of 91 Mn-53 values for 61 individual stones) a Mn-53 production rate of 478 + or - 84 dpm/kg Fe was derived. Based on this figure it was possible to calculate Mn-53 radiation ages for more than 30 stones with exposure ages of at least 10 million yr. A comparison of the results with the respective rare-gas and Al-26 exposure ages (so far available) shows that in general good agreement exists between ages calculated by these three different methods. Only in the case of 'finds', e.g., in Bondoc and some other stones of probably high terrestrial ages, partial losses of Mn-53 seem to have occurred. For well-preserved objects the Mn-53 method is ideal for the estimation of terrestrial residence times.
Englert Peter
Herr W.
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