Early solar irradiation as a source of the inner solar system chromium isotopic heterogeneity

Autor: Klaus Mezger, Y. Kadlag, Ingo Leya, Harry Becker, Jason Hirtz
Rok vydání: 2021
Předmět:
Zdroj: Kadlag, Yogita; Hirtz, Jason; Becker, Harry; Leya, Ingo; Mezger, Klaus (2021). Early solar irradiation as a source of the inner solar system chromium isotopic heterogeneity. Meteoritics & planetary science, 56(11), pp. 2083-2102. Meteoritical Society at the University of Arkansas, Dept. of Chemistry and Biochemistry 10.1111/maps.13756
ISSN: 1945-5100
1086-9379
DOI: 10.1111/maps.13756
Popis: Different solar system objects display variable abundances of neutron-rich isotopes such as 54Cr, 50Ti, and 48Ca, which are commonly attributed to a heterogeneous distribution of presolar grains in different domains of the solar system. Here, we show that the heterogeneity of 54Cr/52Cr and the correlation of 54Cr/52Cr with Fe/Cr in metal fractions of EH3 chondrites and in inner solar system bodies can be attributed to variable irradiation of dust grains by solar energetic particles and variable mixing of irradiated material in the different domains of the inner solar nebula. The isotope variations in inner solar system objects can be generated by ~300 y long local irradiation of mm- to cm-sized solids with average solar energetic particle fluxes of ~105 times the modern value. The relative homogeneity of 53Cr/52Cr in inner solar system objects can be a consequence of the production of 53Mn by the early irradiation of dust, evaporation, and nebula-wide homogenization of Mn due to high temperatures, followed by Mn/Cr fractionation within the first few million years of the solar system. The 54Cr/52Cr of the Earth can be produced by irradiated pebbles and
Databáze: OpenAIRE
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