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Metamorphic data from global subduction zones do not call for excessive overpressures
  • Dazhi Jiang
Dazhi Jiang
Department of Earth Sciences, Western University, Canada, Department of Earth Sciences, Western University, Canada, Department of Earth Sciences, Western University, Canada

Corresponding Author:[email protected]

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Abstract

Yamato and Brun (Nature Geoscience 10, 46-50, 2017) claimed that metamorphic data from global (ultra)high-pressure ((U)HP) rocks exhibit an unusual linear relation, between peak pressure and pressure drop, which challenges current interpretation of P-T-t paths but supports their model invoking excessive overpressures. If their model holds, most research on (U)HP rocks since their discovery would require serious reconsideration. Here, I demonstrate that their model requires critical assumptions that are neither justified by the principles of rock mechanics in the context of realistic geologic settings nor consistent with microstructures of (U)HP rocks. Furthermore, contrary to their claim, the global (U)HP data can be readily explained in the current framework but are inconsistent with their model prediction.
Jul 2021Published in Geochemistry, Geophysics, Geosystems volume 22 issue 7. 10.1029/2021GC009737