Variscan syncollisional extension in the Iberian Massif: structural, metamorphic and geochronological evidence from the Somosierra sector of the Sierra de Guadarrama (Central Iberian Zone, Spain). Viruete, J. E., Huerta, P. P. H., Valverde-Vaquero, P., Fernandez, R. R., & Dunning, G. Tectonophysics, 290(1-2):87–109, May, 1998. WOS:000074517900005doi abstract bibtex The rocks affected by the Variscan orogeny in the Sierra de Guadarrama (Central Iberian Zone) can be separated into two domains: a high-grade Western Domain and a medium- to low-grade Eastern Domain. These domains are separated by the Berzosa-Riaza shear zone. A new integrated analysis of structural, metamorphic and U-Pb monazite age data, indicates that the Berzosa-Riaza shear zone is a major D2 extensional structure associated with oblique, crustal-scale extensional shearing and important decompression. Low-P/high-T metamorphism associated with the D2 event overprints earlier Barrovian metamorphic assemblages formed during the Variscan D1 compressional event. The kilometre-scale Berzosa-Riaza shear zone exhibits a S-C mylonitic front at its base and a crenulation front at its top, with successive fabric development under different P-T conditions indicating crustal thinning. Textural relationships and U-Pb dating of monazite indicate that the main D2 extensional event took place between 337 +/- 2 and 326 +/- 3 Ma (Early-Mid Carboniferous). A late-D2 extensional episode overprinted the major D2 ductile shear zone along narrow, low-grade, oblique-normal detachment zones. Kinematic indicators in both D2 and late-D2 fabrics indicate a displacement of the upper structural levels to the southeast. Field relationships, microstructures and qualitatively derived P-T-t-d paths suggest that the Early-Mid Carboniferous syncollisional extension in the Sierra de Guadarrama was associated with the major extensional collapse of the Variscan hinterland (Central Iberian Zone) and was contemporaneous with the earliest thrusting in the foreland, (C) 1998 Elsevier Science B.V. All rights reserved.
@article{viruete_variscan_1998,
title = {Variscan syncollisional extension in the {Iberian} {Massif}: structural, metamorphic and geochronological evidence from the {Somosierra} sector of the {Sierra} de {Guadarrama} ({Central} {Iberian} {Zone}, {Spain})},
volume = {290},
issn = {0040-1951},
doi = {10/fxd725},
abstract = {The rocks affected by the Variscan orogeny in the Sierra de Guadarrama (Central Iberian Zone) can be separated into two domains: a high-grade Western Domain and a medium- to low-grade Eastern Domain. These domains are separated by the Berzosa-Riaza shear zone. A new integrated analysis of structural, metamorphic and U-Pb monazite age data, indicates that the Berzosa-Riaza shear zone is a major D2 extensional structure associated with oblique, crustal-scale extensional shearing and important decompression. Low-P/high-T metamorphism associated with the D2 event overprints earlier Barrovian metamorphic assemblages formed during the Variscan D1 compressional event. The kilometre-scale Berzosa-Riaza shear zone exhibits a S-C mylonitic front at its base and a crenulation front at its top, with successive fabric development under different P-T conditions indicating crustal thinning. Textural relationships and U-Pb dating of monazite indicate that the main D2 extensional event took place between 337 +/- 2 and 326 +/- 3 Ma (Early-Mid Carboniferous). A late-D2 extensional episode overprinted the major D2 ductile shear zone along narrow, low-grade, oblique-normal detachment zones. Kinematic indicators in both D2 and late-D2 fabrics indicate a displacement of the upper structural levels to the southeast. Field relationships, microstructures and qualitatively derived P-T-t-d paths suggest that the Early-Mid Carboniferous syncollisional extension in the Sierra de Guadarrama was associated with the major extensional collapse of the Variscan hinterland (Central Iberian Zone) and was contemporaneous with the earliest thrusting in the foreland, (C) 1998 Elsevier Science B.V. All rights reserved.},
language = {English},
number = {1-2},
journal = {Tectonophysics},
author = {Viruete, J. E. and Huerta, P. P. H. and Valverde-Vaquero, P. and Fernandez, R. R. and Dunning, G.},
month = may,
year = {1998},
note = {WOS:000074517900005},
keywords = {Central-Iberian Zone, Iberian Massif, U-Pb monazite ages, core complexes, crustal extension, deformation, eastern alps, extensional shear zone, low-pressure metamorphism, ordenes-complex, pelitic schists, shear-zone, southern tibet, tectonics, u-pb systematics},
pages = {87--109},
}
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A new integrated analysis of structural, metamorphic and U-Pb monazite age data, indicates that the Berzosa-Riaza shear zone is a major D2 extensional structure associated with oblique, crustal-scale extensional shearing and important decompression. Low-P/high-T metamorphism associated with the D2 event overprints earlier Barrovian metamorphic assemblages formed during the Variscan D1 compressional event. The kilometre-scale Berzosa-Riaza shear zone exhibits a S-C mylonitic front at its base and a crenulation front at its top, with successive fabric development under different P-T conditions indicating crustal thinning. Textural relationships and U-Pb dating of monazite indicate that the main D2 extensional event took place between 337 +/- 2 and 326 +/- 3 Ma (Early-Mid Carboniferous). A late-D2 extensional episode overprinted the major D2 ductile shear zone along narrow, low-grade, oblique-normal detachment zones. Kinematic indicators in both D2 and late-D2 fabrics indicate a displacement of the upper structural levels to the southeast. Field relationships, microstructures and qualitatively derived P-T-t-d paths suggest that the Early-Mid Carboniferous syncollisional extension in the Sierra de Guadarrama was associated with the major extensional collapse of the Variscan hinterland (Central Iberian Zone) and was contemporaneous with the earliest thrusting in the foreland, (C) 1998 Elsevier Science B.V. All rights reserved.","language":"English","number":"1-2","journal":"Tectonophysics","author":[{"propositions":[],"lastnames":["Viruete"],"firstnames":["J.","E."],"suffixes":[]},{"propositions":[],"lastnames":["Huerta"],"firstnames":["P.","P.","H."],"suffixes":[]},{"propositions":[],"lastnames":["Valverde-Vaquero"],"firstnames":["P."],"suffixes":[]},{"propositions":[],"lastnames":["Fernandez"],"firstnames":["R.","R."],"suffixes":[]},{"propositions":[],"lastnames":["Dunning"],"firstnames":["G."],"suffixes":[]}],"month":"May","year":"1998","note":"WOS:000074517900005","keywords":"Central-Iberian Zone, Iberian Massif, U-Pb monazite ages, core complexes, crustal extension, deformation, eastern alps, extensional shear zone, low-pressure metamorphism, ordenes-complex, pelitic schists, shear-zone, southern tibet, tectonics, u-pb systematics","pages":"87–109","bibtex":"@article{viruete_variscan_1998,\n\ttitle = {Variscan syncollisional extension in the {Iberian} {Massif}: structural, metamorphic and geochronological evidence from the {Somosierra} sector of the {Sierra} de {Guadarrama} ({Central} {Iberian} {Zone}, {Spain})},\n\tvolume = {290},\n\tissn = {0040-1951},\n\tdoi = {10/fxd725},\n\tabstract = {The rocks affected by the Variscan orogeny in the Sierra de Guadarrama (Central Iberian Zone) can be separated into two domains: a high-grade Western Domain and a medium- to low-grade Eastern Domain. 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Kinematic indicators in both D2 and late-D2 fabrics indicate a displacement of the upper structural levels to the southeast. Field relationships, microstructures and qualitatively derived P-T-t-d paths suggest that the Early-Mid Carboniferous syncollisional extension in the Sierra de Guadarrama was associated with the major extensional collapse of the Variscan hinterland (Central Iberian Zone) and was contemporaneous with the earliest thrusting in the foreland, (C) 1998 Elsevier Science B.V. All rights reserved.},\n\tlanguage = {English},\n\tnumber = {1-2},\n\tjournal = {Tectonophysics},\n\tauthor = {Viruete, J. E. and Huerta, P. P. H. and Valverde-Vaquero, P. and Fernandez, R. 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