Possible long-term decline in impact rates. 1. Martian geological data

Details Possible long-term decline in impact rates. 1. Martian geological data Possible long-term decline in impact rates. 1. Martian geological data

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007icar..186....1q&link_type=abstract

Icarus, Volume 186, Issue 1, p. 1-10.

Computer Science

13

Scientific paper

Quantin et al. [Quantin, C., Allemand, P., Mangold, N., Delacourt, C., 2004a. Icarus 172, 555 572] tabulated crater count data for 56 landslides along the walls of Valles Marineris. Under the assumption of a constant cratering rate after about 3 Gyr ago, as used in the 1999 2005 iterations of the crater chronology isochron system of Hartmann, and in the Hartmann and Neukum system, these data indicate a regularly increasing rate of landslides, which would be difficult to explain. We suggest that these data may support a decline in inner Solar System cratering rates by about a factor of 3 since 3 Gyr ago, not unlike predictions based on asteroid belt collision models. Such a decline is also supported by our review of data on lunar impact melts and glass spherules in a companion paper [Hartmann, W.K., Quantin, C., Mangold, N., 2007. Icarus 186, 11 23]. Such models produce not only a more uniform rate of landslides over the last 3 Gyr, but also a more uniform rate of resurfacing processes which also had an apparent increase under the assumption of a constant cratering rate.

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