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Structurally controlled growth of fibrous amphibole in tectonized metagabbro: constraints on asbestos concentrations in non-serpentinized rocks

View ORCID ProfileGianluca Vignaroli, View ORCID ProfileFederico Rossetti, View ORCID ProfileAndrea Billi, Thomas Theye and Girolamo Belardi
Journal of the Geological Society, 27 September 2019, https://doi.org/10.1144/jgs2018-235
Gianluca Vignaroli
Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di BolognaVia Zamboni, 67, 40126 Bologna, Italy
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  • ORCID record for Gianluca Vignaroli
  • For correspondence: gianluca.vignaroli@unibo.it
Federico Rossetti
Dipartimento di Scienze, Sezione di Geologia, Università degli Studi di Roma TreLargo S.L. Murialdo, 1, 00146 Rome, Italy
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  • ORCID record for Federico Rossetti
Andrea Billi
Consiglio Nazionale delle Ricerche, c.o. Dipartimento di Scienze della Terra, Sapienza Università di RomaP.le Aldo Moro 5, 00185 Rome, Italy
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Thomas Theye
Institut für Mineralogie und Kristallchemie, Universität StuttgartAzenbergstrasse 18, D-70174, Stuttgart, Germany
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Girolamo Belardi
Consiglio Nazionale delle Ricerche, Istituto di Geologia Ambientale e Geoingegneria (CNR-IGAG)Via Salaria km 29,300 – 00015 Monterotondo, Rome, Italy
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Abstract

The nucleation and concentration of asbestos in rocks are mostly associated with mechanisms of fibre formation, combined with the water-dependent mineralogical alteration produced during the serpentinization of ultramafic masses. Very little is known about the structural settings and tectonic histories that influence and control the occurrence of asbestos in non-serpentinized rocks diffusely embedded within tectonized ophiolitic suites. Focusing on a case history provided by a tectonized metagabbro from the Ligurian Alps (northern Italy), a multiscale structural–petrographic approach is used to investigate the relationships between rock fabric and fibrous amphibole growth within the metagabbro. Meso- to microstructural observations are used to document the role of structurally controlled fluid–rock interactions in localizing the growth of fibrous amphibole during ductile-to-brittle shearing (mylonitic foliation to shear veins). A qualitative structural scenario is provided to illustrate the growth of asbestos amphiboles in shear veins during the progression of shear deformation towards semi-brittle rheological conditions. The mechanisms of the structurally controlled growth of fibrous amphibole in non-serpentinized rocks imply an examination of the tectonic boundary conditions that are at the origin of the concentration of asbestos in ophiolitic rocks involved in orogenic belt construction.

  • © 2019 The Author(s). Published by The Geological Society of London. All rights reserved
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Structurally controlled growth of fibrous amphibole in tectonized metagabbro: constraints on asbestos concentrations in non-serpentinized rocks

Gianluca Vignaroli, Federico Rossetti, Andrea Billi, Thomas Theye and Girolamo Belardi
Journal of the Geological Society, 27 September 2019, https://doi.org/10.1144/jgs2018-235
Gianluca Vignaroli
Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di BolognaVia Zamboni, 67, 40126 Bologna, Italy
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  • For correspondence: gianluca.vignaroli@unibo.it
Federico Rossetti
Dipartimento di Scienze, Sezione di Geologia, Università degli Studi di Roma TreLargo S.L. Murialdo, 1, 00146 Rome, Italy
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  • ORCID record for Federico Rossetti
Andrea Billi
Consiglio Nazionale delle Ricerche, c.o. Dipartimento di Scienze della Terra, Sapienza Università di RomaP.le Aldo Moro 5, 00185 Rome, Italy
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Thomas Theye
Institut für Mineralogie und Kristallchemie, Universität StuttgartAzenbergstrasse 18, D-70174, Stuttgart, Germany
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Girolamo Belardi
Consiglio Nazionale delle Ricerche, Istituto di Geologia Ambientale e Geoingegneria (CNR-IGAG)Via Salaria km 29,300 – 00015 Monterotondo, Rome, Italy
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Structurally controlled growth of fibrous amphibole in tectonized metagabbro: constraints on asbestos concentrations in non-serpentinized rocks

Gianluca Vignaroli, Federico Rossetti, Andrea Billi, Thomas Theye and Girolamo Belardi
Journal of the Geological Society, 27 September 2019, https://doi.org/10.1144/jgs2018-235
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