Planetary differences in impact melting

Details Planetary differences in impact melting Planetary differences in impact melting

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..20.1551g&link_type=abstract

Advances in Space Research, Volume 20, Issue 8, p. 1551-1560.

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Scientific paper

Surface gravity is a major variable in determining crater dimensions in impact events but it is not a factor in impact melting. This leads to differential scaling between crater and melt dimensions. The extent and effects of differential scaling are examined through model calculations and compared, where possible, with observational data. Compared to smaller impacts on the same planet, relatively more melt is produced in larger impact events and this melt is relatively free of lithic clasts, hotter and less viscous. There are also differences between impacts resulting in similar-sized craters on planetary bodies of differing surface gravity. The absence of central peaks and the appearance of rings at smaller diameters in venusian and terrestrial, compared to lunar, complex impact craters may be due to weakening of uplifted transient cavity floor materials by impact melting. Some other examples of second-order differences in craters between these bodies due to differences in impact melting include the possibility that major impacts on the early Earth (and Venus) did not result in classic multiring craterforms, as observed on the moon.

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