Radial Heterogeneity of 53-Mn in the Early Solar System and the Place of Origin of Ordinary Chondrites

Details Radial Heterogeneity of 53-Mn in the Early Solar System and the Place of Origin of Ordinary Chondrites Radial Heterogeneity of 53-Mn in the Early Solar System and the Place of Origin of Ordinary Chondrites

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..785l&link_type=abstract

Lunar and Planetary Science, volume 27, page 785

Physics

9

Chondrites: Place Of Origin, Manganese-53-Chromium-53, Radionuclies: Short-Lived, Solar Nebula: Heterogeneity

Scientific paper

The earlier results of our studies of 53Mn-53Cr isotope systematics (T(sub)1/2 of 53Mn = 3.7 My) in angrites (LEW 86010, Angra dos Reis) and in some eucrites (Chervony Kut [CK], Juvinas [JI3V1) have suggested that the resolution of small age differences between these differentiated objects is possible if the assumption is true that 53Mn was homogeneously distributed at least in that region of the solar nebula where the meteorite parent bodies formed. The fact that the present day and the initial 53Cr/52Cr ratios in both meteorite classes are significantly higher than the terrestrial and lunar values led us to test the 53Mn-53Cr systematics in several ordinary chondrites, the putative building blocks of planetesimals. We found that these chondrites possess uniform and higher than terrestrial bulk 53Cr/52Cr ratios (0.5 epsilon; 1 epsilon = l x 10^-4) but more than a factor of two lower than the bulk eucrites. Thus, it became clear that the original assumption of 53Mn homogeneity on a large scale may not be valid and that the low abundance on earth of the 53Mn decay product may be the consequence of a solar system wide phenomenon rather than, say, simply depletion at 1 AU due to volatility. The idea of a radially heterogeneous 53Mn distribution in the nebula was suggested and tests of this hypothesis were undertaken.

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