Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sosyr..29..412a&link_type=abstract
Solar System Research, Vol. 29, No. 5, p. 412 - 416
Astronomy and Astrophysics
Astrophysics
2
Earth: Collisions, Earth: History, Earth: Chondrites, Meteorites: Earth
Scientific paper
An analysis of the distribution of 4He and 3He in L chondrites has shown that the parent body of these meteorites underwent a catastrophic collision in space 350±30 Myr ago. This event caused the abundance of the L chondrites with low ages of gas retention. The age value obtained differs considerably from the collision date calculated by Heymann: 520±60 Myr. The ratio of 4He and 3He generation rates in stony meteorites under cosmic ray radiation was found to be 5.8±0.4 (this is in agreement with the corresponding value 5.2±0.3 obtained by Heymann). The catastrophe in space was possibly one of the reasons for the "biotic crisis" on Earth at the boundary of the Devonian and Carboniferous (about 355 Myr ago) and/or Carboniferous and Permian (about 290 Myr ago) as a result of Earth's collision with one or several large celestial bodies.
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