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Open AccessArticle

Textural Identification of Polycrystalline Magmatic, Tectonically-Deformed, and Shock-Related Zircon Aggregates

Department of Geology, University of the Free State, 205 Nelson Mandela Drive, Bloemfontein 9300, Free State, South Africa
Minerals 2020, 10(5), 469; https://doi.org/10.3390/min10050469
Received: 7 April 2020 / Revised: 15 May 2020 / Accepted: 19 May 2020 / Published: 21 May 2020
Zircon with polycrystalline or polygranular appearance is either produced in the magmatic environment through crystallization, or due to deformation in metamorphic settings (including regional metamorphism and ductile shear zones), or as a result of shock-induced recrystallization. All three types can be easily confused and potentially lead to incorrect interpretations, especially if the crystallographic orientation analyses of zircon are not conducted. It is particularly important to establish the difference between tectonically-deformed polygranular zircon and shock-induced polygranular zircon because the latter serves as an indicator of shock event and is often used for dating asteroid impacts. In this paper, a series of polycrystalline zircon grains from ductile shear zones and metamorphic rocks are analyzed using a combination of techniques (BSE, CL, orientation contrast, EBSD, and microprobe mapping), and their properties are compared to reported polycrystalline zircons from magmatic and impact settings. This work shows how appearance, crystallographic orientation, and CL signature of “granules” differ between the different types of deformed zircon. View Full-Text
Keywords: EBSD; shear zones; Eastern Alps; Southern Alps; impact recrystallization; granitoids EBSD; shear zones; Eastern Alps; Southern Alps; impact recrystallization; granitoids
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Kovaleva, E. Textural Identification of Polycrystalline Magmatic, Tectonically-Deformed, and Shock-Related Zircon Aggregates. Minerals 2020, 10, 469.

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