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The northern Oman Mountains record the Late Cretaceous emplacement of the Semail Ophiolite and associated subduction trench and deeper-water sediments into a foredeep on the downwarped Arabian continental margin. In-sequence piggy-back thrusting was modified by later thrust sheets of Permian–Mesozoic continental slope sediments that breached the overlying allochthonous stack. Sections through these culminations show asymmetries linked to deep-seated faults perpendicular to the margin edge which created offsets (promontories) that influenced detachment. Seismic profiles across the foredeep indicate an unconformity at the top of the Mesozoic carbonate platform, the product of early flexural uplift, onlapped by sediments. A second onlap...

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