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Open AccessFeature PaperArticle

Cation Disorder Caused by Olivine-Ringwoodite Phase Transition Mechanism, Possible Explanation for Blue Olivine Inclusion in a Diamond

1
Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14850, USA
2
Cornell University, Ithaca, NY 14850, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Martin Kunz
Minerals 2021, 11(2), 202; https://doi.org/10.3390/min11020202
Received: 31 December 2020 / Revised: 11 February 2021 / Accepted: 12 February 2021 / Published: 15 February 2021
(This article belongs to the Special Issue Structural Characterization of Earth Materials at Extreme Conditions)
Synchrotron X-ray diffraction, as well as visual observations, in a diamond anvil cell (DAC) using soft metal gaskets or slightly reducing gas environment, have revealed that the olivine-ringwoodite transition in olivines of several compositions take place in two steps: step 1: displacive restacking of the oxygen layers, followed by step 2: diffusive reordering of the cations. The initiation of the phase transition was observed at temperatures as low as 200 °C below the reported temperature for the phase transition under hydrostatic conditions. These observations, especially residual disordered cations, have important implications for deep-focus earthquakes, the ability of ringwoodite to host surprising amounts of water, and possibly the observation of a blue olivine inclusion in a natural diamond from Brazil and in a pallasitic meteorite from Russia. View Full-Text
Keywords: mantle; olivine; ringwoodite; wadsleyite; high pressure-temperature; shear deformation; diamond anvil cell; synchrotron radiation mantle; olivine; ringwoodite; wadsleyite; high pressure-temperature; shear deformation; diamond anvil cell; synchrotron radiation
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MDPI and ACS Style

Bassett, W.A.; Skalwold, E.A. Cation Disorder Caused by Olivine-Ringwoodite Phase Transition Mechanism, Possible Explanation for Blue Olivine Inclusion in a Diamond. Minerals 2021, 11, 202. https://doi.org/10.3390/min11020202

AMA Style

Bassett WA, Skalwold EA. Cation Disorder Caused by Olivine-Ringwoodite Phase Transition Mechanism, Possible Explanation for Blue Olivine Inclusion in a Diamond. Minerals. 2021; 11(2):202. https://doi.org/10.3390/min11020202

Chicago/Turabian Style

Bassett, William A.; Skalwold, Elise A. 2021. "Cation Disorder Caused by Olivine-Ringwoodite Phase Transition Mechanism, Possible Explanation for Blue Olivine Inclusion in a Diamond" Minerals 11, no. 2: 202. https://doi.org/10.3390/min11020202

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