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Comment on “Pressure-to-Depth Conversion Models for Metamorphic Rocks: Derivation and Applications”
  • Dazhi Jiang
Dazhi Jiang
Western University, Western University, Western University

Corresponding Author:[email protected]

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Bauville and Yamato (2021, G-cubed, https://doi.org/10.1029/2020GC009280) propose model-based methods to convert metamorphic pressures to depths based on the claim that pressure data from global (ultra)high-pressure rocks challenge the lithostatic assumption and support their model which invokes excessive overpressures. It is argued here that the opposite is true: Natural pressure data are fully consistent with the lithostatic assumption. They reflect selection of (ultra)high-pressure rocks by accessibility and preservation. The data are however inconsistent with the model predictions of Yamato and Brun (2017, Nature Geoscience 10, 46-50) and Bauville and Yamato (2021). Furthermore, their model requires critical assumptions that are not justified by the principles of rock mechanics and unsupported by microstructures from (U)HP rocks.
Jul 2021Published in Geochemistry, Geophysics, Geosystems volume 22 issue 7. 10.1029/2021GC009737