FLOW DIRECTION ASSESSED FROM 3D GEOMETRY RECONSTRUCTION OF KODIAK BUTTE IN JEZERO CRATER (MARS)
Résumé
Upon landing in February 2020, the rover Perseverance of the Mars2020 mission has been exploring Jezero crater on Mars, seeking traces of ancient life. This crater was notably first selected because of the presence of a well-developed fan-shaped sedimentary body in its western part, at the mouth of Neretva Vallis (Fig. 1, e.g., [1]). At the time of the landing, one of the main goals was to assess whether this feature was of fluvial(-deltaic) or alluvial origin. Thanks to long-distance remote observations performed from on-ground by the Perseverance rover, this question has been answered by the identification of structures characteristic of a Gilbert-type delta, confirming the fluvio-deltaic origin of the western fan sedimentary system [1]. Here, we focus on Kodiak butte (Fig. 1), a remnant of a former extension of the Jezero western delta [1]. We used SuperCam’s Remote Micro-Imager (RMI) to obtain long-distance mosaics of Kodiak in order to compute a Digital Outcrop Model (DOM) of the butte. We use the resulting 3D model to characterize the 3-dimensional architecture and stratal patterns within the butte, and to identify variations in flow direction and regime during the late stages of delta deposition.
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