Arrival and magnetization of carbonaceous chondrites in the asteroid belt before 4562 million years ago
Document Type
Article
Publication Date
12-4-2020
Department
Department of Geological and Mining Engineering and Sciences
Abstract
Meteorite magnetizations can provide rare insight into early Solar System evolution. Such data take on new importance with recognition of the isotopic dichotomy between non-carbonaceous and carbonaceous meteorites, representing distinct inner and outer disk reservoirs, and the likelihood that parent body asteroids were once separated by Jupiter and subsequently mixed. The arrival time of these parent bodies into the main asteroid belt, however, has heretofore been unknown. Herein, we show that weak CV (Vigarano type) and CM (Mighei type) carbonaceous chondrite remanent magnetizations indicate acquisition by the solar wind 4.2 to 4.8 million years after Ca-Al-rich inclusion (CAI) formation at heliocentric distances of ~2–4 AU. These data thus indicate that the CV and CM parent asteroids had arrived near, or within, the orbital range of the present-day asteroid belt from the outer disk isotopic reservoir within the first 5 million years of Solar System history.
Publication Title
Communications Earth and Environment
Recommended Citation
O’Brien, T.,
Tarduno, J.,
Anand, A.,
Smirnov, A.,
Blackman, E.,
Carroll-Nellenback, J.,
&
Krot, A.
(2020).
Arrival and magnetization of carbonaceous chondrites in the asteroid belt before 4562 million years ago.
Communications Earth and Environment,
1(1).
http://doi.org/10.1038/s43247-020-00055-w
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/16728