Shock melting and vaporization of lunar rocks and minerals

Details Shock melting and vaporization of lunar rocks and minerals Shock melting and vaporization of lunar rocks and minerals

Apr 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972moon....4..214a&link_type=abstract

The Moon, Volume 4, Issue 1-2, pp. 214-249

Computer Science

49

Scientific paper

The entropy associated with the thermodynamic states produced by hypervelocity meteoroid impacts at various velocities are calculated for a series of lunar rocks and minerals and compared with the entropy values required for melting and vaporization. Taking into account shock-induced phase changes in the silicates, we calculate that iron meteorites impacting at speeds varying from 4 to 6 km/s will produce shock melting in quartz, plagioclase, olivine, and pyroxene. Although calculated with less certainty, impact speeds required for incipient vaporization vary from ~ 7 to 11 km/s for the range of minerals going from quartz to periclase for aluminum (silicate-like) projectiles. The impact velocities which are required to induce melting in a soil, are calculated to be in the range of 3 to 4 km/s, provided thermal equilibrium is achieved in the shock state.

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