Articles | Volume 8, issue 4
https://doi.org/10.5194/se-8-789-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/se-8-789-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
25 Jul 2017
Research article |
| 25 Jul 2017
Interpretation of zircon coronae textures from metapelitic granulites of the Ivrea–Verbano Zone, northern Italy: two-stage decomposition of Fe–Ti oxides
Elizaveta Kovaleva
CORRESPONDING AUTHOR
Department of Geology, University of the Free State, Bloemfontein, 9300, 205 Nelson Mandela Drive, Free State, South Africa
Department of Lithospheric Research, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Althanstrasse 14, Vienna, 1090, Austria
Håkon O. Austrheim
Section of Physics of Geological processes, Department of Geoscience, University of Oslo, Oslo, 0316, Norway
Urs S. Klötzli
Department of Lithospheric Research, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Althanstrasse 14, Vienna, 1090, Austria
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Elizaveta Kovaleva, Håkon Austrheim, and Urs Klötzli
Solid Earth Discuss., https://doi.org/10.5194/se-2016-164, https://doi.org/10.5194/se-2016-164, 2016
Preprint retracted
Short summary
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It is a study of unusual coronary textures formed by zircon in granulitic metapelites, Ivrea-Verbano Zone (Northern Italy). Zircon coronas occur in two generations: (1) thick (5–20 µm) crescent-shaped aggregates and (2) thin (≤ 1 µm) thread-shaped and tangled coronas. Both are found in the same petrological context, so that the difference between two generations is very conspicuous. Formation of zircon coronas is attributed to the two-stage decomposition of Fe-Ti oxides, a rich source of Zr.
E. Kovaleva, U. Klötzli, G. Habler, and E. Libowitzky
Solid Earth, 5, 1099–1122, https://doi.org/10.5194/se-5-1099-2014, https://doi.org/10.5194/se-5-1099-2014, 2014
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Three types of lattice distortion patterns in deformed zircon are detected: (I) gradual bending of the crystal lattice without subgrain boundaries, (II) local gradual bending of the lattice with formation of semicircular subgrain boundaries, and (III) strain-free subgrains separated by subgrain boundaries. The difference is controlled by strain rate and differential stress. Activation of energetically preferable slip systems is facilitated by decoupling from matrix and/or by soft host mineral.
Lisa de Ruiter, Anette Eleonora Gunnæs, Dag Kristian Dysthe, and Håkon Austrheim
Solid Earth, 12, 389–404, https://doi.org/10.5194/se-12-389-2021, https://doi.org/10.5194/se-12-389-2021, 2021
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In this work, the formation of natural magnesium silicate hydrate cement has been studied. The cement forms through the extraordinarily fast dissolution of quartz under high-pH, Mg-rich conditions that occur in south-east Norway where an ultramafic body is exposed. We studied the cemented rocks and the processes that led to the formation of the cement from the field scale to the nanoscale. Magnesium silicate hydrate cement might be a low-CO2 alternative to Portland cement.
Maximilian Rieder, Wencke Wegner, Monika Horschinegg, Stefanie Klackl, Nereo Preto, Anna Breda, Susanne Gier, Urs Klötzli, Stefano M. Bernasconi, Gernot Arp, and Patrick Meister
Solid Earth, 10, 1243–1267, https://doi.org/10.5194/se-10-1243-2019, https://doi.org/10.5194/se-10-1243-2019, 2019
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The formation of dolomite (CaMg(CO3)2), an abundant mineral in Earth's geological record, is still incompletely understood. We studied dolomites embedded in a 100 m thick succession of coastal alluvial clays of Triassic age in the southern Alps. Observation by light microscopy and Sr isotopes suggests that dolomites may spontaneously from concentrated evaporating seawater, in coastal ephemeral lakes or tidal flats along the western margin of the Triassic Tethys sea.
Elizaveta Kovaleva, Håkon Austrheim, and Urs Klötzli
Solid Earth Discuss., https://doi.org/10.5194/se-2016-164, https://doi.org/10.5194/se-2016-164, 2016
Preprint retracted
Short summary
Short summary
It is a study of unusual coronary textures formed by zircon in granulitic metapelites, Ivrea-Verbano Zone (Northern Italy). Zircon coronas occur in two generations: (1) thick (5–20 µm) crescent-shaped aggregates and (2) thin (≤ 1 µm) thread-shaped and tangled coronas. Both are found in the same petrological context, so that the difference between two generations is very conspicuous. Formation of zircon coronas is attributed to the two-stage decomposition of Fe-Ti oxides, a rich source of Zr.
E. Kovaleva, U. Klötzli, G. Habler, and E. Libowitzky
Solid Earth, 5, 1099–1122, https://doi.org/10.5194/se-5-1099-2014, https://doi.org/10.5194/se-5-1099-2014, 2014
Short summary
Short summary
Three types of lattice distortion patterns in deformed zircon are detected: (I) gradual bending of the crystal lattice without subgrain boundaries, (II) local gradual bending of the lattice with formation of semicircular subgrain boundaries, and (III) strain-free subgrains separated by subgrain boundaries. The difference is controlled by strain rate and differential stress. Activation of energetically preferable slip systems is facilitated by decoupling from matrix and/or by soft host mineral.
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We investigate the composition, physical and rheological properties of fluids at the origin of Palaeoarchean chert dikes in South Africa. The dikes formed by repetitive hydraulic fracturing as overpressured oceanic fluids were released at low temperatures as a siliceous slurry. The gelation capacity of silica conferred the chert precursor a viscoelastic, probably thixotrope behaviour. It is an additional step to understand fluid circulations towards the ocean floor, the habitat of early life.
K. Jamshidi, H. Ghasemi, V. R. Troll, M. Sadeghian, and B. Dahren
Solid Earth, 6, 49–72, https://doi.org/10.5194/se-6-49-2015, https://doi.org/10.5194/se-6-49-2015, 2015
I. V. Ashchepkov, N. V. Alymova, A. M. Logvinova, N. V. Vladykin, S. S. Kuligin, S. I. Mityukhin, H. Downes, Yu. B. Stegnitsky, S. A. Prokopiev, R. F. Salikhov, V. S. Palessky, and O. S. Khmel'nikova
Solid Earth, 5, 915–938, https://doi.org/10.5194/se-5-915-2014, https://doi.org/10.5194/se-5-915-2014, 2014
S. Bouquain, N. T. Arndt, F. Faure, and G. Libourel
Solid Earth, 5, 641–650, https://doi.org/10.5194/se-5-641-2014, https://doi.org/10.5194/se-5-641-2014, 2014
V. R. Troll, A. Klügel, M.-A. Longpré, S. Burchardt, F. M. Deegan, J. C. Carracedo, S. Wiesmaier, U. Kueppers, B. Dahren, L. S. Blythe, T. H. Hansteen, C. Freda, D. A. Budd, E. M. Jolis, E. Jonsson, F. C. Meade, C. Harris, S. E. Berg, L. Mancini, M. Polacci, and K. Pedroza
Solid Earth, 3, 97–110, https://doi.org/10.5194/se-3-97-2012, https://doi.org/10.5194/se-3-97-2012, 2012
M. Nasrabady, F. Rossetti, T. Theye, and G. Vignaroli
Solid Earth, 2, 219–243, https://doi.org/10.5194/se-2-219-2011, https://doi.org/10.5194/se-2-219-2011, 2011
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Short summary
This is a study of unusual coronae textures formed by zircon in granulitic metapelites, Ivrea–Verbano Zone (northern Italy). Zircon coronas occur in two generations: (1) thick (5–20 µm) crescent-shaped aggregates and (2) thin (≤ 1 µm) thread-shaped and tangled coronae. Both are found in the same petrological context, so that the difference between two generations is very conspicuous. Formation of zircon coronae is attributed to the two-stage decomposition of Fe–Ti oxides, a rich source of Zr.
This is a study of unusual coronae textures formed by zircon in granulitic metapelites,...
