Characterization of small sedimentary structures in rocks of the Glen Torridon region (Gale crater, Mars) using photogrammetry
Résumé
The Glen Torridon (GT) region in Gale crater, Mars, has been explored by the Mars Science Laboratory Curiosity rover since ~Sol 2300 (Feb. '19), seeking traces of the clay-bearing minerals initially detected from orbiter data [1]. The lowermost locations of the GT trough are dominated by the Jura member mudstones, and fine-grained sandstones of the Knockfarril Hill member above it. The latter exhibit multi-scale laminations and cross-bedding. The precise characterization of these sedimentary structures is critical for understanding the stratigraphic relationships between the GT members, but also the hydrodynamical conditions that prevailed during deposition of these sediments. Some of the smallest structures encountered by Curiosity were observed using the Mars Hand Lens Im-ager (MAHLI) instrument which can resolve coarse silt (62.5 μm) at a distances of ~2 to 4 cm. In this study, we use MAHLI images and Structure-from-Motion (SfM) photogrammetry to reconstruct 3D micro Digital Out-crop Models (DOM) of GT rocks for interpreting small-scale 3D sedimentary structures.
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