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In this paper we present a crater age determination of several terrainsassociated with the Raditladi and Rachmaninoff basins. These basins werediscovered during the first and third MESSENGER flybys of Mercury,respectively. One of the most interesting features of both basins is theirrelatively fresh appearance. The young age of both basins is confirmed by ouranalysis on the basis of age determination via crater chronology. The derivedRachmaninoff and Raditladi basin model ages are about 3.6 Ga and 1.1 Ga,respectively. Moreover, we also constrain the age of the smooth plains withinthe basins' floors. This analysis shows that Mercury had volcanic activityuntil recent time, possibly to about 1 Ga or less. We find that some of thecrater size-frequency distributions investigated suggest the presence of alayered target. Therefore, within this work we address the importance ofconsidering terrain parameters, as geo-mechanical properties and layering, intothe process of age determination. We also comment on the likelihood of theavailability of impactors able to form basins with the sizes of Rachmaninoffand Raditladi in relatively recent times.

The effects of the target material properties and layering on the crater chronology: the case of Raditladi and Rachmaninoff basins on Mercury