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Relations between folding and metamorphism in the central Pyrenees, and their chronological succession


, : Relations between folding and metamorphism in the central Pyrenees, and their chronological succession. Geologie en Mijnbouw 39(5): 163-180

The structural and metamorphic history of the Hercynian (late Paleozoic) belt of the Pyrenees can be divided into prekinematic, early synkinematic, late synkinematic, and postkinematic phases. The early synkinematic phase can be subdivided into two stages; the first stage produced east-trending folds, and caused cleavage in low-grade metamorphic rocks and schistosity in high-grade metamorphics. Effects of the second stage are only noticeable in mica schists and consist of folding about north-trending axes and rotation of minerals; folds are isoclinal and small in size. The late synkinematic deformation produced small-scale cross folding with northwest- and northeast-trending axial planes, and has been found in slates, phyllites, and mica schists. In gneisses and migmatites, the late kinematic cross folding is accompanied by granitization and plastic deformation. Time relations between deformation and crystallization of minerals can be derived from microscopic observation of the relationships between internal and external fabric of porphyroblasts. Crystals of staurolite, andalusite, and cordierite were produced during the deformational phases, and also during periods of static metamorphism between the deformational stages.

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