3 added external forces explanation
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2 added 292 characters in body
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A combination of the Opening Atlantic and push of Africa...my guess is failure of the ocean-continent contact of western Iberia in a couple of million years leading to subduction...

If no hints for differences in density, the elevation must be sustained by external forces. In this sw corner of Eurasia the only continent-continent collision between Africa and Eurasia occurs, west of Arabian plate. And the Ridge Push from Atlantic opening is significant large as well.

A combination of the Opening Atlantic and push of Africa...my guess is failure of the ocean-continent contact of western Iberia in a couple of million years leading to subduction...

A combination of the Opening Atlantic and push of Africa...my guess is failure of the ocean-continent contact of western Iberia in a couple of million years leading to subduction...

If no hints for differences in density, the elevation must be sustained by external forces. In this sw corner of Eurasia the only continent-continent collision between Africa and Eurasia occurs, west of Arabian plate. And the Ridge Push from Atlantic opening is significant large as well.

1
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A combination of the Opening Atlantic and push of Africa...my guess is failure of the ocean-continent contact of western Iberia in a couple of million years leading to subduction...