High-pressure and high-temperature behaviour of α-FeOOH and ϵ-FeOOH: a geological perspective

α-FeOOH exhibits high thermodynamic stability and is the most abundant iron hydroxide in soils and sediments, commonly found as a weathering product in various rocks. Under high pressure, it undergoes a phase transition to the high-pressure phase ϵ-FeOOH. This review discusses the structural, thermal, physical, and spectroscopic properties of α-FeOOH and ϵ-FeOOH. Through a combination of experimental observations and theoretical models, it has been demonstrated that ϵ-FeOOH can form stable solid solutions with δ-AlOOH and MgSiO4H2, thereby extending the stability range of these phases into the lower mantle. The key effects of phase transitions of α-FeOOH and ϵ-FeOOH, including hydrogen bond symmetrization and spin state changes, directly influence the physical properties of these minerals, such as bulk modulus, electrical conductivity, and elasticity. The ultrahigh-pressure phase Py-FeOOHX may decompose in rising mantle plumes, contributing sporadic oxygen sources for the Great Oxidation Event. The Great Oxidation Event, lasting from approximately 2.4 to 2.06 billion years ago, may have been triggered by a prolonged period of instability. Whether other hydrous minerals exhibit similar behaviours, potentially leading to an underestimation of sporadic deep sources, remains an open question for future research.

• Publication year

  2024

• Venue

  Crystallography Reviews

• Publication date

  2024-10-01

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1080/0889311X.2025.2470143
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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