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Domes and basins are evidence for vertical movements in both compression and extension tectonic environments. They are thus evidence for interplay between gravity and tectonic forces in structuring the continental crust. We employ analytical and numerical techniques to investigate the respective roles of gravity and compression during the growth of crustal-scale buckle anticlines and diapirs submitted to instantaneous erosion. The analytical perturbation method, which explores the onset of both types of instability, yields a “phase-diagram” discriminating eight folding-diapirism modes, five of which are geologically relevant. Numerical simulations show that the phase diagram is applicable to evolved, finite amplitude stages. Calculated...

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