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Related Experiment Video

Updated: May 1, 2026

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Late-orogenic retrograde zircon growth.

Sabastien C Dyer1, Ivan Edgeworth1, Brian Kendall1

  • 1Department of Earth and Environmental Sciences, University of Waterloo, 200 University Ave W, Waterloo, N2L3G1 ON Canada.

Contributions to Mineralogy and Petrology. Beitrage Zur Mineralogie Und Petrologie
|April 24, 2025
PubMed
Summary
This summary is machine-generated.

Metamorphic zircon growth, often assumed to occur during peak metamorphism, actually happens during cooling. This study reveals retrograde metamorphic zircon growth in Ontario, challenging previous geological interpretations and highlighting the importance of textural context for accurate dating.

Keywords:
GrenvilleMetamorphismRetrogressionZircon

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Area of Science:

  • Geoscience
  • Petrology
  • Geochronology

Background:

  • Zircon growth is typically associated with prograde or peak metamorphic conditions.
  • Numerical models suggest zircon growth can occur during cooling phases.
  • Understanding zircon growth reactions is crucial for linking U-Pb dates to metamorphic evolution.

Purpose of the Study:

  • To investigate the timing and mechanisms of metamorphic zircon growth.
  • To analyze zircon growth reactions in meta-granitoids from the Grenville Province, Ontario.
  • To reconcile U-Pb zircon dates with the metamorphic history of the region.

Main Methods:

  • In situ analysis of igneous zircon with metamorphic rims in thin sections.
  • Examination of mineral textures and trace element compositions.
  • Phase equilibrium modeling to determine reaction conditions.
  • U-Pb dating of metamorphic zircon rims.

Main Results:

  • Metamorphic zircon growth was linked to melt crystallization and titanomagnetite breakdown.
  • Phase equilibrium modeling indicated these reactions occurred during retrograde metamorphism.
  • U-Pb dates for retrograde metamorphic zircons ranged from ca. 1100 to 1070 Ma, contradicting prior regional interpretations.

Conclusions:

  • Metamorphic zircon growth can occur during retrograde conditions, not just prograde or peak stages.
  • Accurate interpretation of zircon U-Pb dates requires careful analysis of metamorphic textures and context.
  • Pressure-temperature-time paths derived from zircon dates must be cautiously interpreted without petrographic context.