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Assessing trace element (dis)equilibrium and the application of single element thermometers in metamorphic rocks

Review article
Authors A. M. Cruz-Uribe
M. D. Feineman
Thomas Zack
D. E. Jacob
Published in Lithos
Volume 314-315
Pages 1-15
ISSN 0024-4937
Publication year 2018
Published at
Pages 1-15
Language en
Keywords Kinetics, Metamorphism, Thermobarometry, Ti-in-quartz, Ti-in-zircon, Trace elements, Zr-in-rutile, Zr-in-titanite
Subject categories Geology


Empirical and experimental calibration of single element solubility thermometers, such as Zr-in-rutile, Zr-in-titanite, Ti-in-zircon, and Ti-in-quartz, within the past 13 years has greatly expanded our ability to assess the pressure and temperature conditions of individual minerals associated with specific textures in metamorphic rocks. Combined with advances in in situ techniques for analyzing trace concentrations, this has led to an increase in the combined use of single element thermometers, geochronometers, and isotope ratios, often simultaneously, in metamorphic minerals. Here we review the calibration and application of single element thermometers at the pressure and temperature conditions of interest in metamorphic rocks. We discuss to what extent accessory phase equilibrium and trace element equilibrium are attained in metamorphic systems, and the thermodynamic and kinetic framework within which trace element equilibrium is assessed. As an example, we present a comprehensive study of trace element distribution during rutile replacement by titanite in rocks that experienced high-temperature amphibolite-facies overprinting and those that underwent low-temperature blueschist-facies overprinting from a variety of subduction-related terranes worldwide. We find that trace element distributions approach equilibrium partition coefficients in rocks from amphibolite-facies overprinted terranes, whereas trace element distributions do not approach equilibrium in rocks that experienced blueschist-facies overprinting. We caution that single element thermometers that rely upon slow-diffusing high field strength elements should not be applied to rocks equilibrated at <600 °C unless attainment of trace element equilibrium can be demonstrated. © 2018 Elsevier B.V.

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