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    Testing the fidelity of thermometers at ultrahigh temperatures

    85948.pdf (81.38Mb)
    Access Status
    Open access
    Authors
    Clark, Chris
    Taylor, Richard
    Johnson, Tim
    Harley, S.L.
    Fitzsimons, Ian
    Oliver, Liam
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Clark, C. and Taylor, R.J.M. and Johnson, T.E. and Harley, S.L. and Fitzsimons, I.C.W. and Oliver, L. 2019. Testing the fidelity of thermometers at ultrahigh temperatures. Journal of Metamorphic Geology. 37 (7): pp. 917-934.
    Source Title
    Journal of Metamorphic Geology
    DOI
    10.1111/jmg.12486
    ISSN
    0263-4929
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150102773
    Remarks

    This is the peer reviewed version of the following article: Clark, C, Taylor, RJM, Johnson, TE, Harley, SL, Fitzsimons, ICW, Oliver, L. Testing the fidelity of thermometers at ultrahigh temperatures. J Metamorph Geol. 2019; 37: 917– 934, which has been published in final form at https://doi.org/10.1111/jmg.12486. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

    URI
    http://hdl.handle.net/20.500.11937/86107
    Collection
    • Curtin Research Publications
    Abstract

    A highly residual granulite facies rock (sample RG07-21) from Lunnyj Island in the Rauer Group, East Antarctica, presents an opportunity to compare different approaches to constraining peak temperature in high-grade metamorphic rocks. Sample RG07-21 is a coarse-grained pelitic migmatite composed of abundant garnet and orthopyroxene along with quartz, biotite, cordierite, and plagioclase with accessory rutile, ilmenite, zircon, and monazite. The inferred sequence of mineral growth is consistent with a clockwise pressure–temperature (P–T) evolution when compared with a forward model (P–T pseudosection) for the whole-rock chemical composition. Peak metamorphic conditions are estimated at 9 ± 0.5 kbar and 910 ± 50°C based on conventional Al-in-orthopyroxene thermobarometry, Zr-in-rutile thermometry, and calculated compositional isopleths. U–Pb ages from zircon rims and neocrystallized monazite grains yield ages of c. 514 Ma, suggesting that crystallization of both minerals occurred towards the end of the youngest pervasive metamorphic episode in the region known as the Prydz Tectonic Event. The rare earth element compositions of zircon and garnet are consistent with equilibrium growth of these minerals in the presence of melt. When comparing the thermometry methods used in this study, it is apparent that the Al-in-orthopyroxene thermobarometer provides the most reliable estimate of peak conditions. There is a strong textural correlation between the temperatures obtained using the Zr-in-rutile thermometer––maximum temperatures are recorded by a single rutile grain included within orthopyroxene, whereas other grains included in garnet, orthopyroxene, quartz, and biotite yield a range of temperatures down to 820°C. Ti-in-zircon thermometry returns significantly lower temperature estimates of 678–841°C. Estimates at the upper end of this range are consistent with growth of zircon from crystallizing melt at temperatures close to the elevated (H2O undersaturated) solidus. Those estimates, significantly lower than the calculated temperature of this residual solidus, may reflect isolation of rutile from the effective equilibration volume leading to an activity of TiO2 that is lower than the assumed value of unity.

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