The High-Pressure Structural Evolution of Olivine along the Forsterite–Fayalite Join

Pamato, Martha G.; Nestola, Fabrizio; Novella, Davide; Smyth, Joseph R.; Pasqual, Daria; Gatta, G. Diego; Alvaro, Matteo; Secco, Luciano

doi:10.3390/min9120790

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The High-Pressure Structural Evolution of Olivine along the Forsterite–Fayalite Join

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Department of Geosciences, University of Padova, Via G. Gradenigo 6, 35131 Padova, Italy

Department of Earth and Environmental Sciences, University of Pavia, Via A. Ferrata 1, 27100 Pavia, Italy

Department of Geological Sciences, University of Colorado, 2200 Colorado Ave, Boulder, CO 80309, USA

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Department of Earth Sciences, University of Milan, Via Botticelli 23, 20133 Milan, Italy

Author to whom correspondence should be addressed.

Minerals 2019, 9(12), 790; https://doi.org/10.3390/min9120790

Received: 7 November 2019 / Revised: 3 December 2019 / Accepted: 11 December 2019 / Published: 14 December 2019

(This article belongs to the Special Issue Properties of Melt and Minerals at High Pressures and High Temperatures)

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Abstract

Structural refinements from single-crystal X-ray diffraction data are reported for olivine with a composition of Fo₁₀₀ (forsterite Mg₂SiO₄, synthetic), Fo₈₀ and Fo₆₂ (~Mg_1.6Fe_0.4SiO₄ and ~Mg_1.24Fe_0.76SiO₄, both natural) at room temperature and high pressure to ~8 GPa. The new results, along with data from the literature on Fo₀ (fayalite Fe₂SiO₄), were used to investigate the previously reported structural mechanisms which caused small variations of olivine bulk modulus with increasing Fe content. For all the investigated compositions, the M2 crystallographic site, with its bonding configuration and its larger polyhedral volume, was observed to control the compression mechanisms in olivine. From Fo₁₀₀ to Fo₀, the compression rates for M2–O and M1–O bond lengths were observed to control the relative polyhedral volumes, resulting in a less-compressible M1O₆ polyhedral volume, likely causing the slight increase in bulk modulus with increasing Fe content. View Full-Text

Keywords: olivine; forsterite; fayalite; crystal structure; high pressure; X-ray diffraction

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MDPI and ACS Style

Pamato, M.G.; Nestola, F.; Novella, D.; Smyth, J.R.; Pasqual, D.; Gatta, G.D.; Alvaro, M.; Secco, L. The High-Pressure Structural Evolution of Olivine along the Forsterite–Fayalite Join. Minerals 2019, 9, 790. https://doi.org/10.3390/min9120790

AMA Style

Pamato MG, Nestola F, Novella D, Smyth JR, Pasqual D, Gatta GD, Alvaro M, Secco L. The High-Pressure Structural Evolution of Olivine along the Forsterite–Fayalite Join. Minerals. 2019; 9(12):790. https://doi.org/10.3390/min9120790

Chicago/Turabian Style

Pamato, Martha G., Fabrizio Nestola, Davide Novella, Joseph R. Smyth, Daria Pasqual, G. D. Gatta, Matteo Alvaro, and Luciano Secco. 2019. "The High-Pressure Structural Evolution of Olivine along the Forsterite–Fayalite Join" Minerals 9, no. 12: 790. https://doi.org/10.3390/min9120790

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The High-Pressure Structural Evolution of Olivine along the Forsterite–Fayalite Join

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