On the evolution of structure and metamorphism during the alpine orogeny in the eastern and central Betic Zone (Betic Cordilleras, Spain)

Abstract

The relationships between Alpine overthrusting, folding and regional metamorphism in the eastern and central Betic Zone are discussed, in the light of recent studies. It is substantiated that two major episodes of metamorphism had occurred, related to distinct stages of the orogenic evolution. In this there is a marked analogy with the evolutionary trend of the internal zone of the Alps. The conspicuous difference between the two belts lies in the time relationship between the final emplacement of the nappes and the 'main' episode of crystallization. In the Betic Zone it is the early episode that has determined the overall 'picture' of the metamorphism.