Timescales of shock processes in chondritic and martian meteorites

P. Beck (), Ph. Gillet, A. El Goresy and S. Mostefaoui
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P. Beck: Ecole Normale Supérieure de Lyon et Université Lyon I
Ph. Gillet: Ecole Normale Supérieure de Lyon et Université Lyon I
A. El Goresy: Max-Planck-Institut für Chemie
S. Mostefaoui: Max-Planck-Institut für Chemie

Nature, 2005, vol. 435, issue 7045, 1071-1074

Abstract: Messages from Mars About 35 of the thousands of meteorites so far found on Earth are recognized as being from Mars, probably thrown up by the impacts of large bodies such as asteroids on the martian surface. The trace-element distribution between high-pressure minerals formed by intense shock in these meteorites is a measure of the duration of the events that formed them, and the brief (10 ms) duration suggests that the impacting bodies were of the order of 100 metres in diameter. In contrast, stony meteorites (chondrites) formed by collisions much earlier in the life of the Solar System record the presence of much larger colliding bodies, around 5 km in size and causing a 1-second shock on impact.

Date: 2005
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DOI: 10.1038/nature03616

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