%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Lagain, A.
%A Bouley, S.
%A Baratoux, David
%A Costard, F.
%A Wieczorek, M.
%T Impact cratering rate consistency test from ages of layered ejecta on Mars
%D 2020
%L fdi:010077879
%G ENG
%J Planetary and Space Science
%@ 0032-0633
%K Impact craters ; Mars ; Impact rate ; Layered ejecta craters
%M ISI:000510110900002
%P art. 104755 [11 ]
%R 10.1016/j.pss.2019.104755
%U https://www.documentation.ird.fr/hor/fdi:010077879
%> https://www.documentation.ird.fr/intranet/publi/2020/02/010077879.pdf
%V 180
%W Horizon (IRD)
%X Ages of geological units of planetary bodies are determined from impact crater counts on their surface. These ages are model-dependent, and several models largely used in the community assume a constant production function and a constant cratering rate over the last 3 Ga. We have mapped the population of small impact craters (>200 m in diameter) formed over a population of large impact craters (>5 km in diameter) with layered ejecta on Acidalia Planitia, Mars. We have deduced the age of each large impact crater under the assumption of a constant impact rate and constant production function. The impact rate inferred from this set of ages is, however, not constant and show a significant increasing during the last similar to 1 Ga compared to chronology models commonly used. We interpret this inconsistency as an evidence for temporal variations in the size-frequency distribution (SFD) of impactors in the main belt, consistent with recent studies argued for a late increasing of the large impactor flux on Earth and the Moon.
%$ 060 ; 020