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← GeographyWhich mechanism causes strong regional uplift during flat-slab subduction?
A)Mantle convection-driven surface buckling
B)Enhanced crustal melting and intrusion
C)Asthenospheric counterflow induced drag
D)Lithospheric compression and ductile thickening✓
💡 Explanation
When a subducting plate travels horizontally (flat-slab subduction), lithospheric compression increases because the overriding plate experiences greater horizontal stress, causing ductile thickening and regional uplift. Therefore lithospheric compression results, rather than alternate mechanisms related to surface buckling, melting, or asthenospheric drag, which are less directly driven by lithospheric stresses.
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