the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Interpretation of zircon corona textures from metapelitic granulites of Ivrea-Verbano Zone, Northern Italy: Two-stage decomposition of Fe-Ti oxides
Abstract. In this study we report the occurrence of zircon corona textures in metapelitic granulites of the Ivrea-Verbano Zone. Unusual zircon textures are spatially associated with Fe-Ti oxides and occur as (1) vermicular-shaped aggregates 50–200 µm long and 5–20 µm thick, and as (2) zircon coronas and fine-grain chains, hundreds of µm long and ≤ 1 µm thick, spatially associated with (1). Formation of such textures is a result of mineral-fluid reactions, which occurred in two stages and involved: (1) decomposition of ilmenite to Zr-rich rutile and vermicular-shaped zircon during peak metamorphism and initial cooling stage, and (2) recrystallization of Zr-rich rutile to Zr-depleted rutile and submicron-thick zircon coronas during further exhumation and cooling. We also observed hat-shaped grains that are composed of preexisting zircon overgrown by zircon coronas during stage (2). Hat-shaped grains have a flat surface towards the oxide phase, which indicates partial dissolution of preexisting zircon grain. Formation of vermicular zircon (1) preceded ductile and brittle deformation of the host rock, as vermicular zircon is found both plastically- and cataclastically-deformed. Formation of thin zircon coronas (2) was coeval with or soon after the brittle deformation, as coronas occasionally fill fractures in the host rock.
Occurrences of zircon coronas has important implications in fundamental studies regarding metamorphism, metasomatism and element transport in the Earth’s crust. We demonstrate that metamorphic zircon can nucleate and grow as a result of hydration reactions at the cooling stage after granulite-facies metamorphism, and reflects stages of rock evolution. Zircon corona textures are the tool for indicating metamorphic and metasomatic reactions in the host rock, and establish the directions of the reaction front.
This preprint has been retracted.
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Retraction notice
This preprint has been retracted.
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Preprint
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Supplement
(75 KB)
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This preprint has been retracted.
- Preprint
(1656 KB) - Metadata XML
- Revised submission
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Supplement
(75 KB) - BibTeX
- EndNote
Interactive discussion
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RC1: 'Review - Kovaleva et al. - Interpretation of zircon corona textures', Nigel Kelly, 20 Jan 2017
- AC1: 'rebuttal letter to the comments of reviewer 1 (Nigel Kelly)', Elizaveta Kovaleva, 06 Mar 2017
- AC2: 'pdf file of the manuscript with comments and answers', Elizaveta Kovaleva, 06 Mar 2017
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RC2: 'Review of paper: Interpretation of zircon corona textures from metapelitic granulites of Ivrea-Verbano Zone, Northern Italy: Two-stage decomposition of Fe-Ti oxides', Fernando Corfu, 04 Feb 2017
- AC3: 'response to the review presented by F. Corfu', Elizaveta Kovaleva, 06 Mar 2017
- AC4: 'pdf attachment with comments', Elizaveta Kovaleva, 06 Mar 2017
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EC1: 'Resubmit', Roberto Weinberg, 09 Feb 2017
- AC5: 'Answer to the editor's decision', Elizaveta Kovaleva, 09 Mar 2017
Interactive discussion
-
RC1: 'Review - Kovaleva et al. - Interpretation of zircon corona textures', Nigel Kelly, 20 Jan 2017
- AC1: 'rebuttal letter to the comments of reviewer 1 (Nigel Kelly)', Elizaveta Kovaleva, 06 Mar 2017
- AC2: 'pdf file of the manuscript with comments and answers', Elizaveta Kovaleva, 06 Mar 2017
-
RC2: 'Review of paper: Interpretation of zircon corona textures from metapelitic granulites of Ivrea-Verbano Zone, Northern Italy: Two-stage decomposition of Fe-Ti oxides', Fernando Corfu, 04 Feb 2017
- AC3: 'response to the review presented by F. Corfu', Elizaveta Kovaleva, 06 Mar 2017
- AC4: 'pdf attachment with comments', Elizaveta Kovaleva, 06 Mar 2017
-
EC1: 'Resubmit', Roberto Weinberg, 09 Feb 2017
- AC5: 'Answer to the editor's decision', Elizaveta Kovaleva, 09 Mar 2017
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Discussed
Elizaveta Kovaleva
Håkon Austrheim
Urs Klötzli
This preprint has been retracted.
- Preprint
(1656 KB) - Metadata XML
- Revised submission
-
Supplement
(75 KB) - BibTeX
- EndNote