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Cosmic Ray Exposure History of Meteorites

  • Rainer Wieler
  • Thomas Graf
Chapter

Abstract

The cosmic ray exposure age of a meteorite is the time it spent as a roughly meter- sized object in interplanetary space. Exposure age distributions are relevant to evaluate the influx of matter to Earth and its time dependence. We review here exposure ages of the major meteorite classes derived from the asteroid belt and discuss briefly also meteorites from the Moon and Mars. The data allow us to estimate the number of meteorite-producing impact events and provide important constraints for dynamical models of meteorite delivery to Earth. Given the myriad of potential meteorite parent asteroids, a perhaps astonishingly large fraction of all meteorites originates in a small number of collisions on even fewer parent bodies. Our sampling of asteroidal material is therefore highly incomplete and the proportion of certain meteorite types in fall statistics will change on time scales on the order of 0.1–100 Myr. The transfer times of lunar meteorites to Earth are much shorter than for Martian meteorites. It is not well understood why we do not have substantially more meteorites from the Moon than from Mars.

Keywords

Parent Body Carbonaceous Chondrite Iron Meteorite Ordinary Chondrite Asteroid Belt 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2001

Authors and Affiliations

  • Rainer Wieler
    • 1
  • Thomas Graf
    • 2
  1. 1.Isotope GeologyETH ZürichZürichSwitzerland
  2. 2.Pharmacology and ToxicologyUniversity of ZürichZürichSwitzerland

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