Olivine-Ahrensite Phase Relations in the Mg₂SiO₄-Fe₂SiO₄ System as a Function of Temperature

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Chanyshev, Artem ; Bondar, Dmitry ; Wang, Lin ; Fei, Hongzhan ; Tsujino, Noriyoshi ; Song, Yunke ; Martirosyan, Naira ; Chakraborti, Amrita ; Kim, Eun Jeong ; Tang, Hu ; Bhat, Shrikant ; Farla, Robert ; Katsura, Tomoo:
Olivine-Ahrensite Phase Relations in the Mg₂SiO₄-Fe₂SiO₄ System as a Function of Temperature.
In: Journal of Geophysical Research: Solid Earth. Bd. 131 (2026) Heft 1 . - e2025JB032870.
ISSN 2169-9356
DOI: https://doi.org/10.1029/2025JB032870

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Abstract

Olivine and ahrensite are the primary components of the interiors of Fe-rich terrestrial planets and meteorites, making their phase relations crucial for planetary science. Moreover, their phase relations can be used for calibrating large-volume high-pressure devices such as multi-anvil apparatus. Here we defined the olivine–ahrensite phase relations in the MgO-FeO-SiO2 system at 7.5–12.0 GPa at 1,530 and 1,950 K using a multi-anvil apparatus. Combining the current results with our previously determined binary loop at 1,740 K, we re-estimated the shock parameters of several L5 and L6-types meteorites. Also, we determined the olivine-ahrensite phase ratio and compositions along cold and warm Mars aerotherms for Mg/(Mg + Fe) ratios of 0.75 and 0.80. Using this mineralogical model, we estimated and compared seismic wave velocity profiles in Mars' interior to data from the InSight geophysical mission.