Abstract
The age of Mars yardangs is significant in studying their development and the evolution of paleoclimate conditions. For planetary surface or landforms, a common method for dating is based on the frequency and size distribution of all the superposed craters after they are formed. However, there is usually a long duration for the yardangs’ formation, and they will alter the superposed craters, making it impossible to give a reliable dating result with the method. An indirect method by analyzing the ages of the superposed layered ejecta was devised in the research. First, the layered ejecta that are superposed on and not altered by the yardangs are identified and mapped. Then, the ages of the layered ejecta are derived according to the crater frequency and size distribution on them. These ages indicate that the yardangs ceased development by these times, and the ages are valuable for studying the evolution of the yardangs. This indirect dating method was applied to the areas of Martian yardangs in the Medusae Fossae Formation (MFF). The ages of the selected six layered ejecta range from ~0.50 Ga to ~1.5 Ga, indicating that the evolution of the corresponding yardangs had been ceased before these times. Analysis of more layered ejecta craters and superposed yardangs implies that yardangs in the MFF have a long history of development and some yardangs are still in active development.
Highlights
IntroductionMars has a variety of aeolian landforms [1,2,3,4,5,6], and a yardang is an important example
Published: 30 March 2021Mars has a variety of aeolian landforms [1,2,3,4,5,6], and a yardang is an important example.Yardangs are widely distributed on the Martian surface, and it is significant for studying the Martian history of surface processes [7]
This study focuses on constraining the ages of Martian yardangs in the Medusae Fossae
Summary
Mars has a variety of aeolian landforms [1,2,3,4,5,6], and a yardang is an important example. Yardangs are widely distributed on the Martian surface, and it is significant for studying the Martian history of surface processes [7]. Yardangs on Mars have been used as paleoenvironmental markers because the orientations of Martian yardangs are congruent with that of present-day bedform migration [14]. Due to the lack of suitable methods and data sets, the chronology of Martian yardangs was rarely studied, it is extremely important to the related analysis, such as the environmental evolution of the Martian surface [5,14]
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