Conjugate Shear Fractures at 'Ki Corona,' Southeast Parga Chasma, Venus

Computer Science

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Coronae, Fractures, Structure, Tectonics, Venus

Scientific paper

Brittle tensile failure of Venus' surface is evident in many tectonic regimes, including as extension fractures associated with caldera collapse, radial and concentric fractures of coronae, fractures normal to folds, and fracture belts. However, evidence of brittle shear failure has been described at only two localities_intersecting fractures oblique to wrinkle ridges in Lavinia Planitia were interpreted as conjugate shear fractures by Watters, and en echelon fractures in Guinevere Planitia record dominant extension. but with a component of shear. We confirm these earlier interpretations, and recognize the widespread nature of conjugate shear fractures across the Venus surface, identifying examples at over 100 locations in varied tectonic regimes, including coronae, wrinkle-ridged plains, and fracture belts. However, we focus here on fracture and fold relations at "Ki Corona" (46.8 degrees S, 302.5 degrees E), and their implications toward corona evolution.

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