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Zircon oxygen and hafnium isotope decoupling during regional metamorphism: implications for the generation of low δ18O magmas

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Abstract

Measurements of U–Th–Pb, Lu–Hf and oxygen isotopes as well as selected trace and rare earth elements were carried out on zircon grains from high-grade metasedimentary rocks from the Albany–Fraser Orogen in southwest Australia. Oxygen isotopes from detrital zircon domains yield δ18O (VSMOW) values ranging from 5.8 to 8.0‰ and exhibit coupled Hf- and O-isotope compositions. In contrast, metamorphic zircon domains show considerably less variability in O-isotope compositions with a median δ18O of 5.6 ± 0.5‰ and exhibit decoupled Hf- and O-isotope compositions. 176Hf/177Hf isotope ratios of metamorphic zircon grains are within the evolutionary trend defined by the detrital grains implying negligible input from external sources during their growth. In addition, the relatively low δ18O value of the metamorphic zircons implies crystallisation from a relatively 18O depleted crustal melt. Such δ18O values are lower than those typically observed in most metamorphic zircon, including those preserved in partial melts of metasediments (10–12‰) and suggest that the sedimentary protolith was hydrothermally altered by meteoric fluids prior to high-temperature metamorphism. We suggest that alteration of the sedimentary protolith is related to the proximity to the Fraser Shear Zone, a major crustal scale structure within the orogen, which may represent an old reactivated structure. Occurrences of low δ18O metamorphic zircon, and potentially also low δ18O igneous rocks, in ancient collisional settings may, therefore, delineate long-lived fluid pathways within the crust.

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Acknowledgements

The authors thank reviewers Adrien Vezinet and Stefan Claesson and journal editor Daniela Rubatto for constructive comments that improved this work. Financial support for this work was provided by the Minerals Research Institute of Western Australia (MRIWA) and GSWA as part of Project M470; Mineral Systems on the Margins of Cratons. MIHH also acknowledges financial support from a Curtin University International Postgraduate Research Scholarship. RHS and CVS publish with permission of the Executive Director of the Geological Survey of Western Australia.

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Authors and Affiliations

  1. School of Earth and Planetary Science, Curtin University, Perth, Australia

    Michael I. H. Hartnady, Christopher L. Kirkland & Chris Clark

  2. School of Earth Sciences, The University of Western Australia, Perth, Australia

    Laure Martin

  3. Geological Survey of Western Australia, 100 Plain Street, East Perth, WA, 6004, Australia

    R. Hugh Smithies & Catherine V. Spaggiari

  4. Centre for Microscopy, Characterisation, and Analysis, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS), University of Western Australia, Crawley, Australia

    Laure Martin

  5. Centre for Exploration Targeting-Curtin Node, Curtin University, Perth, Australia

    Michael I. H. Hartnady & Christopher L. Kirkland

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Hartnady, M.I.H., Kirkland, C.L., Martin, L. et al. Zircon oxygen and hafnium isotope decoupling during regional metamorphism: implications for the generation of low δ18O magmas. Contrib Mineral Petrol 175, 9 (2020). https://doi.org/10.1007/s00410-019-1646-7

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