Dariia Simonova

University of Bayreuth

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Leonid Dubrovinsky

University of Bayreuth

YА

Yu. А. Litvin

Institute of Experimental Mineralogy

АВ

А. В. Спивак

Institute of Experimental Mineralogy

Egor Zakharchenko

Institute of Experimental Mineralogy

Maxim Bykov

Goethe University Frankfurt

Natalia Dubrovinskaia

University of Bayreuth

M. Millot

Lawrence Livermore National Laboratory

Egor Koemets

University of Oxford

Liudmila A. Gorelova

St Petersburg University

Burkhard Militzer

University of California, Berkeley

Cooperative Institutions

University of Bayreuth

Bayer (Germany)

Deutsches Elektronen-Synchrotron DESY

Lawrence Livermore National Laboratory

Sandia National Laboratories

European Synchrotron Radiation Facility

Bayerisches Landesamt für Umwelt

Energetics (United States)

University of Rochester

General Atomics (United States)

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Evolution of diamond-forming systems of the mantle transition zone: ringwoodite peritectic reaction (Mg,Fe)2SiO4 (experiment AT 20 GPa)

Геохимия (2019)

А. В. Спивак Yu. А. Litvin Egor Zakharchenko Dariia Simonova Leonid Dubrovinsky

The peritectic reaction of ringwoodite (Mg,Fe)2SiO4 and silicate-carbonate melt with formation of magnesiowustite (Fe,Mg)O, stishovite SiO2 and Mg, Na, Ca, K-carbonates is revealed by experimental study at 20 GPa of melting relations of the multicomponent MgO-FeO-SiO2-Na2CO3-CaCO3-K2CO3 system of the Earth’s mantle transition zone. A reaction of CaCO3 and SiO2 with the formation of Ca-perovskite CaSiO3 is also detected. It is shown that the peritectic reaction of ringwoodite and melt with the formation of stishovite physic-chemically controls the fractional ultrabasic-basic evolution of both magmatic and diamond-forming systems of the deep horizons of the transition zone up to its boundary with the Earth’s lower mantle.

Ringwoodite

Stishovite

10.31857/s0016-7525649986-994

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Recreating Giants Impacts in the Laboratory: Shock Compression of Bridgmanite to 14 Mbar

Geophysical Research Letters (2020)

M. Millot Shuai Zhang D. E. Fratanduono F. Coppari Sébastien Hamel

Abstract Understanding giant impacts requires accurate description of how extreme pressures and temperatures affect the physical properties of the constituent materials. Here, we report shock experiments on two polymorphs of MgSiO : enstatite and bridgmanite (perovskite) crystals. We obtain pressure‐density shock equation of state to 14 Mbar and more than 9 g/cm , a 40% increase in density from previous data on MgSiO . Density‐functional‐theory molecular dynamics (DFT‐MD) simulations provide predictions for the shock Hugoniot curves for bridgmanite and enstatite and suggest that the Grüneisen parameter decreases with increasing density. The good agreement between the simulations and the experimental data, including for the shock temperature along the enstatite Hugoniot reveals that DFT‐MD simulations reproduce well the behavior of dense fluid . We also reveal a high optical reflectance indicative of a metal‐like electrical conductivity which supports the hypothesis that magma oceans may contribute to planetary magnetic field generation.

Enstatite

Silicate perovskite

Periclase

10.1029/2019gl085476

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Citations (22)

Polymorphism of feldspars above 10 GPa

Nature Communications (2020)

Anna Pakhomova Dariia Simonova Iuliia Koemets Egor Koemets Georgios Aprilis

Abstract Feldspars are rock-forming minerals that make up most of the Earth’s crust. Along the mantle geotherm, feldspars are stable at pressures up to 3 GPa and may persist metastably at higher pressures under cold conditions. Previous structural studies of feldspars are limited to ~10 GPa, and have shown that the dominant mechanism of pressure-induced deformation is the tilting of AlO 4 and SiO 4 tetrahedra in a tetrahedral framework. Herein, based on results of in situ single-crystal X-ray diffraction studies up to 27 GPa, we report the discovery of new high-pressure polymorphs of the feldspars anorthite (CaSi 2 Al 2 O 8 ), albite (NaAlSi 3 O 8 ) , and microcline (KAlSi 3 O 8 ). The phase transitions are induced by severe tetrahedral distortions, resulting in an increase in the Al and/or Si coordination number. High-pressure phases derived from feldspars could persist at depths corresponding to the Earth upper mantle and could possibly influence the dynamics and fate of cold subducting slabs.

Microcline

Anorthite

Nepheline

10.1038/s41467-020-16547-4

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Citations (36)

Structural Study of δ-AlOOH Up to 29 GPa

Minerals (2020)

Dariia Simonova Elena Bykova Maxim Bykov Takaaki Kawazoe Arkadiy Simonov

A structure and equation of the state of δ-AlOOH has been studied at room temperature, up to 29.35 GPa, by means of single crystal X-ray diffraction in a diamond anvil cell using synchrotron radiation. Above ~10 GPa, we observed a phase transition with symmetry changes from P21nm to Pnnm. Pressure-volume data were fitted with the second order Birch-Murnaghan equation of state and showed that, at the phase transition, the bulk modulus (K0) of the calculated wrt 0 pressure increases from 142(5) to 216(5) GPa.

Diamond anvil cell

10.3390/min10121055

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Citations (13)

Evolution of Diamond-Forming Systems of the Mantle Transition Zone: Ringwoodite Peritectic Reaction (Mg,Fe)2SiO4 (Experiment at 20 GPa)

Geochemistry International (2019)

А. В. Спивак Yu. А. Litvin Egor Zakharchenko Dariia Simonova Leonid Dubrovinsky

Ringwoodite

Stishovite

10.1134/s0016702919090118

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Citations (0)