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- W46402743 abstract "Recent evidence suggests that pedes-tal craters (Pd) on Mars form via a sublimation of a surrounding ice-rich terrain [1-3], rather than by eolian deflation of a dry layer [4,5]. Our work supports a model that relies on impact into volatile-rich targets to produce Pd during periods of higher obliquity [3], when mid- to high-latitude substrates were character-ized by thick deposits of snow and ice [6]. The area proximal to the crater becomes armored during the im-pact event. During return to lower obliquity [7], the regional ice-rich unit sublimated, except below the pro-tective cover of the armored pedestal surfaces. These intervening volatiles eventually migrated poleward. In this model, the ages of individual Pd and the timescale of formation of the Pd population have sig-nificant implications for the timing and recurrence of the accumulation of ice-rich material at mid latitudes. Here, we provide evidence that Pd are young (Mid to Late Amazonian) and formed from multiple episodes of emplacement of ice-rich material at mid latitudes." @default.
- W46402743 created "2016-06-24" @default.
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- W46402743 date "2010-03-01" @default.
- W46402743 modified "2023-09-23" @default.
- W46402743 title "The Formation Timescale and Ages of Mid-Latitude Pedestal Craters on Mars" @default.
- W46402743 hasPublicationYear "2010" @default.
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