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Microstructure and elastic anisotropy of naturally deformed leucogneiss from a shear zone in Montalto (southern Calabria, Italy)

Rosolino Cirrincione, Eugenio Fazio, Renée Heilbronner, Hartmut Kern, Kurt Mengel, Gaetano Ortolano, Antonino Pezzino and Rosalda Punturo
Geological Society, London, Special Publications, 332, 49-68, 1 January 2010, https://doi.org/10.1144/SP332.4
Rosolino Cirrincione
Department of Geological Sciences, Catania University, Corso Italia 57, 95129 Catania, Italy
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Eugenio Fazio
Department of Geological Sciences, Catania University, Corso Italia 57, 95129 Catania, Italy
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Renée Heilbronner
Department of Geosciences, Basel University, Bernoullistrasse 32, CH-4056 Basel, Switzerland
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Hartmut Kern
Institute of Geosciences, Kiel University, Olshausenstrasse 40, 24098 Kiel, Germany
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Kurt Mengel
Institut für Endlagerforschung, Clausthal University, Adolph-Roemer-Strasse 2A, 38678 Clausthal-Zellerfeld, Germany
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Gaetano Ortolano
Department of Geological Sciences, Catania University, Corso Italia 57, 95129 Catania, Italy
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Antonino Pezzino
Department of Geological Sciences, Catania University, Corso Italia 57, 95129 Catania, Italy
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Rosalda Punturo
Department of Geological Sciences, Catania University, Corso Italia 57, 95129 Catania, Italy
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  • For correspondence: punturo@unict.it
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Abstract

A strain gradient was mesoscopically recognized in sheared leucogneisses cropping out near Mount Montalto (Calabria, southern Italy) in the Aspromonte–Peloritani Unit on the basis of field observations. In order to investigate the relationship between textural and physical anisotropy, a microstructural and petrophysical study was carried out on selected mylonites exhibiting different stages of deformation. The main mineral assemblage is Qtz+Pl+Kfs+Wm, displaying S–C and shear-band textures; mica-fish and ribbon-like quartz are widespread.

As strain increases K-feldspar, biotite and premylonitic low phengite white mica transformed to synmylonitic high phengite white mica and quartz, accompanied by an increasing albitization. Different quartz c-axis patterns are ascribable to non-coaxial progressive deformation; we suggest that deformation proceeded under greenschist- up to amphibolite-facies conditions owing to a local increase in shearing temperature.

Laboratory seismic measurements were carried out on sample cubes (43 mm edged) cut according to the structural frame (foliation, lineation) of the rock. At 400 MPa and room temperature the averages of compressional (Vp) and shear-wave velocities (Vs) are very similar: 5.70–5.91 and 3.36–3.55 km s−1, respectively. Seismic anisotropy and shear-wave splitting are related to the modal amounts of constituent minerals (in particular mica) and their crystallographic preferred orientation. Importantly, anisotropy is lowest in the most strained rock.

  • © The Geological Society of London 2010
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Geological Society, London, Special Publications: 332 (1)
Geological Society, London, Special Publications
Volume 332
2010
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Microstructure and elastic anisotropy of naturally deformed leucogneiss from a shear zone in Montalto (southern Calabria, Italy)

Rosolino Cirrincione, Eugenio Fazio, Renée Heilbronner, Hartmut Kern, Kurt Mengel, Gaetano Ortolano, Antonino Pezzino and Rosalda Punturo
Geological Society, London, Special Publications, 332, 49-68, 1 January 2010, https://doi.org/10.1144/SP332.4
Rosolino Cirrincione
Department of Geological Sciences, Catania University, Corso Italia 57, 95129 Catania, Italy
  • Find this author on Google Scholar
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  • Search for this author on this site
Eugenio Fazio
Department of Geological Sciences, Catania University, Corso Italia 57, 95129 Catania, Italy
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  • Find this author on PubMed
  • Search for this author on this site
Renée Heilbronner
Department of Geosciences, Basel University, Bernoullistrasse 32, CH-4056 Basel, Switzerland
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  • Search for this author on this site
Hartmut Kern
Institute of Geosciences, Kiel University, Olshausenstrasse 40, 24098 Kiel, Germany
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Kurt Mengel
Institut für Endlagerforschung, Clausthal University, Adolph-Roemer-Strasse 2A, 38678 Clausthal-Zellerfeld, Germany
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Gaetano Ortolano
Department of Geological Sciences, Catania University, Corso Italia 57, 95129 Catania, Italy
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Antonino Pezzino
Department of Geological Sciences, Catania University, Corso Italia 57, 95129 Catania, Italy
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Rosalda Punturo
Department of Geological Sciences, Catania University, Corso Italia 57, 95129 Catania, Italy
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  • Search for this author on this site
  • For correspondence: punturo@unict.it

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Microstructure and elastic anisotropy of naturally deformed leucogneiss from a shear zone in Montalto (southern Calabria, Italy)

Rosolino Cirrincione, Eugenio Fazio, Renée Heilbronner, Hartmut Kern, Kurt Mengel, Gaetano Ortolano, Antonino Pezzino and Rosalda Punturo
Geological Society, London, Special Publications, 332, 49-68, 1 January 2010, https://doi.org/10.1144/SP332.4
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