On preferred disorder and the shock history of chemical group IVA meteorites

Details On preferred disorder and the shock history of chemical group IVA meteorites On preferred disorder and the shock history of chemical group IVA meteorites

Aug 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34..883j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 34, Issue 8, pp.883-884

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7

Scientific paper

We report the results of a metallographic and X-ray diffraction study of the shock history of 16 meteorites of chemical group IVA. Of these, 12 contain evidence for preterrestrial shock-loading to pressures of 130 kb or more. These results, together with previous ones, indicate that about 60 per cent of the group IVA meteorites have been strongly shocked and thus that the collision which produced this group was particularly violent. The physical and chemical properties of these meteorites are consistent with their origin from a single Marscrossing asteroid that was disrupted by collision with another object, tentatively identified with the parent body of a few hypersthene chondrites. In this event the shock-induced velocity impulse may have been helpful but not essential in causing these meteorites to be eventually captured by earth.

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