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Polyphase Evolution of a Crustal-scale Shear Zone During Progressive Exhumation from Ductile to Brittle Behaviour: a Case Study from Calabria, Italy : Volume 7, Issue 1 (06/03/2015)

By Fazio, E.

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Book Id: WPLBN0004022099
Format Type: PDF Article :
File Size: Pages 47
Reproduction Date: 2015

Title: Polyphase Evolution of a Crustal-scale Shear Zone During Progressive Exhumation from Ductile to Brittle Behaviour: a Case Study from Calabria, Italy : Volume 7, Issue 1 (06/03/2015)  
Author: Fazio, E.
Volume: Vol. 7, Issue 1
Language: English
Subject: Science, Solid, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Cirrincione, R., Pezzino, A., Ortolano, G., Fazio, E., & Visalli, R. (2015). Polyphase Evolution of a Crustal-scale Shear Zone During Progressive Exhumation from Ductile to Brittle Behaviour: a Case Study from Calabria, Italy : Volume 7, Issue 1 (06/03/2015). Retrieved from http://cloud-library.org/


Description
Description: Università degli Studi di Catania, Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Corso Italia 57, 95129 Catania, Italy. Mylonitic rocks involved within a polyphase crustal-scale shear zone, cropping out in the Aspromonte Massif (Calabria, Italy), has been investigated to reveal the meso- and micro-structural evolution (from ductile- to brittle-type deformation) occurred during exhumation trajectory. A relatively small area (about 4 km2) has been selected in the central-eastern part of the massif to constrain the sequence of the structural features from the earliest ones (Hercynian in age), almost totally obliterated by a pervasive mylonitic foliation (plastic regime), up to recent ones, consisting of various sets of veins typical of semibrittle to brittle regime. The former ductile evolution was followed by a compressive thin-skinned thrusting stage developed during the Apennine phase of the Alpine Orogeny, interested by a second brittle stage, consistent with the switching from compressive to extensional tectonics. This last stage accompanied the final exhumation process causing the activation of regional scale normal faults, which partly disarticulated previous mylonitic microstructures. A suite of oriented specimens were collected and analyzed to complete the deformational history already recognized in the field. Quartz c axis orientation patterns confirm the greenschist facies conditions of the former ductile exhumation stage with a dominant top-to-NE sense of shear. Microstructural investigations highlighted the progressive development from plastic- to brittle-type structures, allowing to constrain each step of the multistage exhumation history, and to establish the relative timing of the stress field variation causing thrusting and subsequent normal faulting. Obtained results support a continue compressional exhumation of this sector since the opening of Tyrrhenian basin (10 Ma).

Summary
Polyphase evolution of a crustal-scale shear zone during progressive exhumation from ductile to brittle behaviour: a case study from Calabria, Italy

Excerpt
Angì, G., Cirrincione, R., Fazio, E., Fiannacca, P., Ortolano, G., and Pezzino, A.: Metamorphic evolution of preserved Hercynian crustal section in the Serre Massif (Calabria-Peloritani Orogen, southern Italy), Lithos, 115, 237–262, 2010.; Behr, W. M. and Platt, J. P.: A naturally constrained stress profile through the middle crust in an extensional terrane, Earth Planet. Sc. Lett., 303, 181–192, 2011.; Barrett, S. D.: Image SXM, University of Liverpool, available at: http://www.ImageSXM.org.uk, last access: December 2014, 2010.; Bonardi, G., Compagnoni, R., Messina, A., and Perrone, V.: Riequilibrazioni metamorfiche di probabile età alpina nell'Unità dell'Aspromonte – Arco Calabro Peloritano, Rendiconti della Società Italiana di Mineralogia e Petrologia, 39, 613–628, 1984.; Bonardi, G., Compagnoni, R., Del Moro, A., Messina, A., and Perrone, V.: Riequilibrazioni tettonico-metamorfiche Alpine dell'Unità dell'Aspromonte, Calabria Meridionale, Rendiconti della Società Italiana di Mineralogia e Petrologia, 42, p. 301, 1987.; Bürgmann, R. and Dresen, G.: Rheology of the lower crust and upper mantle: evidence from rock mechanics, geodesy and field observations, Annu. Rev. Earth Pl. Sc., 36, 531–567, doi:10.1146/annurev.earth.36.031207.124326, 2008.; Cirrincione, R., Fazio, E., Fiannacca, P., Ortolano, G., Pezzino, A., and Punturo, R.: Petrological and microstructural constraints for orogenetic exhumation modelling of HP rocks: the example of southern Calabria Peloritani Orogen (Western Mediterranean), in: GeoMod 2008, Third International Geomodelling Conference, Firenze, 22–24 September 2008, Boll. Geof. Teor. Appl., 49, 141–146, 2008a.; Cirrincione, R., Ortolano, G., Pezzino, A., and Punturo, R.: Poly-orogenic multi-stage metamorphic evolution inferred via P–T pseudosections: an example from Aspromonte Massif basement rocks (Southern Calabria, Italy), Lithos, 103, 466–502, doi:10.1016/j.lithos.2007.11.001, 2008b.; Cirrincione, R., Fazio, E., Fiannacca, P., Ortolano, G., and Punturo, R.: Microstructural Investigation of Naturally Deformed Leucogneiss from an Alpine Shear Zone (Southern Calabria – Italy), Pure Appl. Geophys., 166, 995–1010, 2009.; Cirrincione, R., Fazio, E., Heilbronner, R., Kern, H., Mengel, K., Ortolano, G., Pezzino, A., and Punturo, R.: Microstructure and elastic anisotropy of naturally deformed leucogneiss from a shear zone in Montalto (southern Calabria, Italy), Geological Society of London, Sp. Publ., 332, 49–68, 2010.; Cirrincione, R., Fazio, E., Ortolano, G., Pezzino, A., and Punturo, R.: Fault-related rocks: deciphering the structural–metamorphic evolution of an accretionary wedge in a collisional belt, NE Sicily, Int. Geol. Rev., 54, 940–956, 2012.; Cirrincione, R., Fazio, E., Fiannacca, P., Ortolano, G., Pezzino, A., Punturo, R., Romano, V., and Sacco, V.: The Alpine evolution of the Aspromonte Massif: constraints for geodynamic reconstruction of the Calabria-Peloritani Orogen, Geological Field Trips, 5, 1–73, 2013.; Crisci, G. M., Donati, G., Messina, A., Russo, S., and Perrone, V.: L'Unità superiore dell'Aspromonte. Studio geologico e petrografico, Rendiconti della Società Italiana di Mineralogia e Petrologia, 38, 989–1014, 1982.; Dunlap, W. J., Hirth, G., and Teyssier, C.: Thermomecanical evolution of a ductile duplex, Tectonics, 16, 983–1000, 1997.; Fazio, E., Cirrincione, R., and Pezzino, A.: Estimating P-T conditions of Alpine-type metamorphism using multistage garnet in the tectonic windows of the Cardeto area (southern Aspromonte Massif, Calabria), Miner. Petrol., 93, 111–142, doi:10.1007/s00710-007-0216-2, 2008.; Fazio, E., Cirrincione, R., and Pezzino, A.: Garnet crystal growth in sheared metapelites (southern Calabria – Italy):


 

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