Plurifacial alpine metamorphism in the eastern Betic Cordilleras (SE Spain), with special reference to the genesis of the glaucophane |
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Authors: | Prof Dr W P De Roever Drs H J Nijhuis |
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Institution: | (1) Present address: Geologisch Instituut, Nieuwe Prinsengracht 130, Amsterdam C |
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Abstract: | Rocks metamorphosed in two or more different facies are not necessarily polymetamorphic and are termed plurifacial rocks. The following age sequence of metamorphic facies of alpine age is reported: (1) glaucophane-schist facies; (2) albite-epidote-amphibolite facies; (S) almandine-amphibolite facies. There was a transition from kinematic to static conditions. The alpine metamorphism described seems to have proceeded under a pile of overthrust sheets. The change in metamorphic facies was in part due to a considerable rise of the temperature.
Zusammenfassung In mehreren verschiedenen Fazies metamorphosierte Gesteine brauchen nicht polymetamorph zu sein, und werden als plurifazielle Gesteine bezeichnet. Folgende zeitliche Abfolge metamorpher Fazies alpinen Alters wird beschrieben: 1. Glaukophanschieferfazies, 2. Albit-Epidot-Amphibolitfazies, 3. Almandin-Amphibolitfazies. Es gab einen Übergang von kinematischen zu statischen Bedingungen. Die beschriebene alpine Metamorphose scheint unter einer Deckenlast vor sich gegangen zu sein. Der zeitliche Fazieswechsel wurde z. T. von einer beträchtlichen Temperatursteigerung bedingt.
Résumé Les roches montrant plus d'un seul faciès métamorphique ne sont pas nécessairement polymétamorphiques et sont dénommées plurifacielles. Quant au métamorphisme alpin, l'ordre suivant de succession chronologique des faciès fut constaté: (1) le faciès à glaucophane, (2) le faciès amphibolite à albite-epidote, (3) le faciès amphibolite à almandin. Des conditions de métamorphisme cinématiques ont été suivies par des conditions statiques. Il paraît que le métamorphisme alpin décrit s'est effectué dans un géosynclinal de nappes. Le changement de faciès métamorphique dans le temps était partiellement dû à une augmentation considérable de la température.
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