Determination of phase relations of the olivine–ahrensite transition in the Mg2SiO4–Fe2SiO4 system at 1740 K using modern multi-anvil techniques

The phase relations of iron-rich olivine and its high-pressure polymorphs are important for planetary science and meteoritics because these minerals are the main constituents of terrestrial mantles and meteorites. The olivine–ahrensite binary loop was previously determined by thermochemical calculat...

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Bibliographic Details
Published in:Contributions to mineralogy and petrology 2021-10, Vol.176 (10), Article 77
Main Authors: Chanyshev, Artem, Bondar, Dmitry, Fei, Hongzhan, Purevjav, Narangoo, Ishii, Takayuki, Nishida, Keisuke, Bhat, Shrikant, Farla, Robert, Katsura, Tomoo
Format: Article
Language:English
Subjects:
Anvils
Calibration
Chondrites
Earth and Environmental Science
Earth mantle
Earth Sciences
Experiments
Geology
High temperature
Iron constituents
Mathematical analysis
Meteors & meteorites
Mineral Resources
Mineralogy
Olivine
Original Paper
Petrology
Phase transitions
Planetary mantles
Pressure
Software
Solid solutions
Temperature
X-ray diffraction
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Summary:The phase relations of iron-rich olivine and its high-pressure polymorphs are important for planetary science and meteoritics because these minerals are the main constituents of terrestrial mantles and meteorites. The olivine–ahrensite binary loop was previously determined by thermochemical calculations in combination with high-pressure experiments; however, the transition pressures contained significant uncertainties. Here we determined the binary loop of the olivine–ahrensite transition in the (Mg,Fe) 2 SiO 4 system at 1740 K in the pressure range of 7.5–11.2 GPa using a multi-anvil apparatus with the pressure determined using in situ X-ray diffraction, compositional analysis of quenched run products, and thermochemical calculation. Based on the determined binary loop, a user-friendly software was developed to calculate pressure from the coexisting olivine and ahrensite compositions. The software is used to estimate the shock conditions of several L6-type chondrites. The obtained olivine–ahrensite phase relations can also be applied for precise in-house multi-anvil pressure calibration at high temperatures.
ISSN:0010-7999
1432-0967
DOI:10.1007/s00410-021-01829-x