Metal size distributions in EH and EL chondrites

Details Metal size distributions in EH and EL chondrites Metal size distributions in EH and EL chondrites

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30h...2s&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 8, pp. 2-1, CiteID 1420, DOI 10.1029/2002GL016672

Physics

2

Planetology: Solar System Objects: Asteroids And Meteoroids, Planetology: Solar System Objects: Extraterrestrial Materials, Planetology: Solar System Objects: Meteorites And Tektites

Scientific paper

EL chondrites exhibit larger average metal grain sizes than EH chondrites, a difference attributed by Easton [1983] to metamorphic coarsening, as most EL chondrites are equilibrated, and most EH chondrites are unequilibrated. In this paper, we present metal grain size data for three unequilbrated EL3 chondrites (PCA 91020; ALH 85119; MAC 88180) , and three EH3 chondrites (ALH 84170; PCA 91085; PCA 91238). We find that EL3 chondrites have larger average metal grain sizes than EH3 chondrites, and that grain sizes of the unequilibrated enstatite chondrites are similar to those of equilibrated chondrites of the same class. We thus interpret the metal size distributions of enstatite chondrites as primarily reflecting their pre-metamorphic distributions. Shock processing appears to have had only minor influence on metal grain size distributions in these meteorites.

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