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Geography

Which mechanism causes crustal thinning directly above a strike-slip fault zone?

A)Extensional stress from fault plane bend
B)Isostatic rebound after glacial melt
C)Thermal uplift from magma plumes
D)Sediment loading and basin subsidence

💡 Explanation

When a strike-slip fault has a bend or stepover, extensional stresses are induced because the plates are pulled apart, causing crustal thinning. Therefore extensional stress from the fault plane bend results, rather than isostatic rebound, thermal uplift or basin subsidence which involve different geological processes altogether.

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