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Radionuclides in Chassigny and Nakhla meteorites of Mars origin: Implications for their pre-atmospheric sizes and cosmic-ray exposure ages.
- Source :
-
Planetary & Space Science . Jul2020, Vol. 186, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
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Abstract
- Two Martian meteorites, Chassigny and Nakhla, were analyzed by non-destructive gamma-ray spectrometry to determine concentrations of cosmogenic (26Al) and primordial (40K, 238U, 232Th) radionuclides, and to estimate their pre-atmospheric sizes and cosmic-ray exposure ages. The pre-atmospheric radii of the Chassigny and Nakhla meteorites were estimated using the cosmogenic 26Al to be 17 ± 4 and 30 ± 5 cm, which would result in their total masses of 30–130 and 210–580 kg, respectively. This is comparable to the size and mass estimated for other chassignites and nakhlites. The cosmic-ray exposure ages of the Chassigny and Nakhla meteorites estimated using the 26Al – 21Ne isotope pair were 12.8 ± 2.5 and 11.6 ± 1.8 Myr, respectively, in agreement with published ages of chassignites and nakhlites averaged from several isotope methods, i.e. 11.6 ± 0.8 and 12.2 ± 0.8 Myr, respectively. • Two Martian meteorites, Chassigny and Nakhla, were analyzed by non-destructive gamma-ray spectrometry. • Pre-atmospheric radii of the Chassigny and Nakhla were estimated to be 17 ± 4 and 30 ± 5 cm, respectively. • Cosmic-ray exposure ages of the Chassigny and Nakhla were estimated to be 12.8 ± 2.5 and 11.6 ± 1.8 Myr, respectively. • The obtained results are in agreement with published ages of chassignites and nakhlites. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00320633
- Volume :
- 186
- Database :
- Academic Search Index
- Journal :
- Planetary & Space Science
- Publication Type :
- Academic Journal
- Accession number :
- 142931206
- Full Text :
- https://doi.org/10.1016/j.pss.2020.104914