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Upheaval Dome, Utah, USA: Impact origin confirmed

¹ Institut für Planetologie, Universität Stuttgart, 70174 Stuttgart, Germany
² Museum für Naturkunde-Mineralogie, Humboldt-Universität zu Berlin, 10115 Berlin, Germany

View larger version (95K): [in this window] [in a new window]   Figure 1. Top view of Upheaval Dome on Colorado Plateau in Canyonlands National Park, southeastern Utah, USA, and position of sample location.

View larger version (85K): [in this window] [in a new window]   Figure 2. Shocked quartz grains investigated in thin sections. A–B: Quartz grain 1 showing two dominant sets of decorated planar deformation features parallel to and subordinate lamellae; crossed polarizers. C–D: Quartz grain 2 ("toasted quartz") exhibiting all three rhombohedral planes of lamellae, closer spacing, and more intricate interpenetration; parallel polarizers.

View larger version (74K): [in this window] [in a new window]   Figure 3. Bright field transmission electron micrographs (TEM) of quartz grain 1. A: Rhombohedral lamellae are straight and parallel and have varying thickness. Defect density is extremely high within lamellae. B–C: Dislocation bands along contain numerous bubbles and fluid inclusions <400 nm in diameter. D: Partial dislocation and low-angle subgrain boundary.