Deformation and metamorphism in the Fenes Nappe (southern Apuseni Mountains,Romania)Déformation et métamorphisme dans la nappe de Fenes (monts Apuseni méridionaux,Roumanie) |
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| Authors: | Alessandro Ellero Leonardo Leoni Michele Marroni Ionel Nicolae Luca Pandolfi Franco Sartori |
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| Institution: | 1. Dipartimento di Scienze della Terra, Università di Pisa, 56126 Pisa, Italy;2. Romanian Academy Institute of Geodynamics, 79678 Bucharest, Romania;3. Centro di Studio per la Geologia Strutturale e Dinamica dell''Appennino, CNR, 56126 Pisa, Italy |
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| Abstract: | The Fenes Nappe belongs to the stack of tectonic units cropping out in the southern Apuseni Mts (Romania). It is characterised by a structural history consisting of two folding phases that developed during the time spanning from Early Aptian to Late Maastrichtian. The D1 phase produced west-northwest-verging, isoclinal to very tight folds, associated to a slaty cleavage. The main metamorphic imprint of the Fenes Nappe is linked to this deformation phase; illite and chlorite ‘crystallinity’ values indicate metamorphic conditions of the late diagenesis, close to the diagenetic zone/anchizone boundary. The subsequent D2 phase produced north-northwest-verging, parallel folds, not associated with synkinematic recrystallisation. These phases are interpreted as developed during a structural path, which includes burial at a depth of 8–10 km, followed by exhumation at shallower structural levels. To cite this article: A. Ellero et al., C. R. Geoscience 334 (2002) 347–354. |
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| Keywords: | deformation illite and chlorite crystallinity late diagenesis Fenes Nappe Cretaceous Apuseni Mts Romania déformation cristallinité de l'illite et de la chlorite diagenèse supérieure nappe de Fenes Crétacé Monts Apuseni Roumanie Tectonique Tectonics |
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