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报告题目：High-pressure behavior Fe-O-H system in the deep Earth’s interior

报告嘉宾：Elena Bykova，法兰克福大学 教授

报告时间：2025年8月19日 9:30

报告地点：吉林大学中心校区超硬综合实验室楼A514

主持人：刘寒雨

报告摘要

　　The high-pressure behavior of hydrous minerals under extreme high-pressure and high-temperature conditions has garnered increasing attention in recent years. Water significantly influences the chemical and physical properties of mantle minerals, affecting melting temperatures, sound velocities, and material viscosity. Water is continuously delivered to the Earth's interior through hydrous phases in subducting slabs, where it participates in numerous chemical reactions with mantle constituents. Iron oxyhydroxide ε-FeOOH (Py-phase) and the recently discovered pyrite-FeO2Hx (x ≤ 1) are considered potential candidates for transporting water and hydrogen to the lowermost mantle . The formation of pyrite-FeO2Hx at the core-mantle boundary, possibly resulting from reactions between water released from subducting slabs and the iron core, has been proposed as a potential origin for ultralow-velocity zones and seismic anomalies at the core-mantle boundary .

　　In this study, we applied methods of single-crystal X-ray diffraction in laser-heating diamond anvil cells (DACs) to investigate high-pressure behaviour, chemical reactivity and thermal stability of compounds belonging to Fe-O-H system. Recent advancements in multi-grain singlecrystal XRD enable the detection of phases in minor quantities and the reliable determination of their crystal structures. We discuss the chemical processes that occur between iron oxides/oxyhydroxides and aqueous fluids under conditions corresponding to the deep interiors of the Earth.              

嘉宾简介

　　Prof. Dr. Elena Bykova is a junior research group leader in the Institute of Geosciences, Goethe University Frankfurt. She earned her Ph.D. in 2015 from Bayerisches Geoinstitut at the University of Bayreuth, Germany, where she developed methodology of single-crystal X-ray diffraction experiments under high-pressure and high-temperature conditions. Her work led to the discovery of numerous oxides, carbonates, silicates, borides, and carbides with novel, not anticipated at ambient pressure, crystal chemistry. In 2018, in recognition of her outstanding contributions to ultra-high-pressure crystallography, she was awarded the Max von Laue Prize by the German Crystallographic Society.

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