Articles | Volume 8, issue 4
Solid Earth, 8, 789–804, 2017
https://doi.org/10.5194/se-8-789-2017
Solid Earth, 8, 789–804, 2017
https://doi.org/10.5194/se-8-789-2017

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 et al.

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Cited articles

Austrheim, H., Putnis, C. V., Engvik, A. K., and Putnis, A.: Zircon coronae around Fe–Ti oxides: a physical reference frame for metamorphic and metasomatic reactions, Contrib. Mineral. Petr., 156, 517–527, 2008.
Barboza, S. A., Bergantz, G. W., and Brown, M.: Regional granulite facies metamorphism in the Ivrea zone: is the Mafic Complex the smoking gun or a red herring?, Geology, 27, 447–450, 1999.
Bea, F. and Montero, P.: Behavior of accessory phases and redistribution of Zr, REE, Y, Th, and U during metamorphism and partial melting of metapelites in the lower crust: An example from the Kinzigite Formation of Ivrea-Verbano, NW Italy, Geochim. Cosmochim. Acta, 63, 1133–1153, 1999.
Bhattacharya, A., Mohanty, L., Maji, A., Sen, S. K., and Raith, M.: Non-ideal mixing in the phlogopite-annite binary: constraints from experimental data on Mg-Fe partitioning and a reformulation of the biotite-garnet geothermometer, Contrib. Mineral. Petrol., 111, 87–93, 1992.
Bingen, B., Austrheim, H., and Whitehouse, M.: Ilmenite as a source for zirconium during high-grade metamorphism? Textural evidence from the Caledonides of western Norway and implications for zircon geochronology, J. Petrol., 42, 355–375, 2001.
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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.