Computer Science
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..855l&link_type=abstract
In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M p 855-856 (SEE N94-16173 03-91)
Computer Science
Energy Spectra, Manganese Isotopes, Meteoritic Composition, Mineralogy, Shock Wave Propagation, Carbonaceous Chondrites, Iron Meteorites, Murchison Meteorite, Orgueil Meteorite, Solar System
Scientific paper
The effects of influence of shock wave propagation on the energy spectrum of accelerated particles that lead to different production rates of radionuclides, in particular, Mn-53, on small scales in the early solar system are shown. Search for evidence for extinct Mn-53 has stimulated investigations of Cr isotope anomalies in meteorites. The linear correlation between the magnitude of the Cr-53* excesses and the Mn/Cr ratio that unambiguously proves the in situ decay of Mn-53 was detected, really, in different mineral phases of some carbonaceous and enstatite chondrites, primitive achondrites, pallasites and iron meteorites. However, the data on the Cr-53* excess rarely defines a single linear array on a Mn-53-Cr-52 evolution diagram even for meteorites of the same chemical group. A clear isochron with Mn-53/Mn-55 = 4.4 plus or minus 1.0 x 10-5 (in range of approximately 2.4 to approximately 9 x 10-5) is observed for CAI of the Allende C3-chondrite while the data for the Murchison C2- and Orgueil C1-chondrites fall much lower corresponding rather to Mn-53/Mn-55 less than 2 x 10-5. In the case of iron meteorites it ranges from less than 5 x 10-8 to less than 5 x 10-5.
Lavrukhina A. K.
Ustinova G. K.
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