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  Localization of submicron inclusion re-equilibration at healed fractures in host garnet

Griffiths, T. A., Habler, G., Rhede, D., Wirth, R., Ram, F., & Abart, R. (2014). Localization of submicron inclusion re-equilibration at healed fractures in host garnet. Contributions to Mineralogy and Petrology, 168(6), 1-21. doi:10.1007/s00410-014-1077-4.

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Griffiths, T. A.1, Author           
Habler, Gerlinde2, Author           
Rhede, Dieter3, Author           
Wirth, Richard4, Author           
Ram, Farangis5, Author           
Abart, Rainer6, Author           
1Department of Lithospheric Research, Center for Earth Sciences, University of Vienna, Althanstrasse 14, Vienna, Austria, persistent22              
2Department of Lithospheric Research, Vienna University, Althanstraße 14, 1090 Vienna, Austria, persistent22              
3Helmholtzzentrum Potsdam, Deutsches GeoForschungsZentrum, Telegrafenberg, Potsdam, Germany, ou_persistent22              
4GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany, ou_persistent22              
5Microscopy and Diffraction, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863391              
6Department of Lithospheric Research, University of Vienna, Althanstrasse 14, Vienna, Austria, ou_persistent22              


Free keywords: deformation mechanism; diffusion; fracture; garnet; geochemistry; inclusion; metamorphism; phase equilibrium; plastic deformation; rock microstructure, Alps; Austria; Eastern Alps; Koralpe
 Abstract: Microstructures in Permian inclusion-bearing metapegmatite garnets from the Koralpe (Eastern Alps, Austria) reveal re-equilibration by coarsening of abundant submicron-sized inclusions (1 µm-2 nm diameter) at the site of healed brittle cracks. The microstructures developed during Cretaceous eclogite-facies deformation and the related overprinting of the host-inclusion system. Trails of coarsened inclusions (1-10 µm diameter) crosscut the garnet, defining traces of former fractures with occasional en-echelon overlaps. Trails are flanked by 10- to 100-µmwide 'bleaching zones' characterized by the absence of ≤1-µm-sized inclusions in optical and SE images. FEGmicroprobe data show that trails and bleaching zones can form isochemically, although some trails exhibit non-isochemical coarsening. Cross-correlation-based EBSD analysis reveals garnet lattice rotation of up to 0.45°, spatially correlated with bleaching zones. The garnet lattice in the center of trails is misoriented around different axes with respect to the lattice either side of the trail. Elevated dislocation density within bleaching zones is confirmed by TEM observations. Dislocations represent a plastic wake formed by crystal plastic deformation at the crack tip. Fracture enhanced diffusion rates in the lattice adjacent to crack planes by introducing dislocations, priming these areas to behave differently to the bulk of the garnet during Cretaceous metamorphism and facilitating localized coarsening of inclusions. Diffusion within the bleaching zone was enhanced by a minimum factor of 102. The partially closed host-inclusion system records the influence of deformation mechanisms on re-equilibration and contributes to understanding of the interaction between deformation and chemical reaction during metamorphism. © 2014, Springer-Verlag Berlin Heidelberg.


Language(s): eng - English
 Dates: 2014-11-23
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s00410-014-1077-4
BibTex Citekey: Griffiths2014
 Degree: -



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Title: Contributions to Mineralogy and Petrology
  Other : Contrib. Mineral. Petrol.
Source Genre: Journal
Publ. Info: Springer
Pages: 21 Volume / Issue: 168 (6) Sequence Number: - Start / End Page: 1 - 21 Identifier: ISSN: 0010-7999
CoNE: https://pure.mpg.de/cone/journals/resource/110985822454566