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Abstract
Tibetan ophiolites are shallow mantle material and crustal slabs that were subducted as deep as the mantle transition zone, a conclusion supported by the discovery of high-pressure phases like inverse ringwoodite in these sequences. Ringwoodite, Mg2SiO4, exhibits the normal spinel structure, with Mg in the octahedral A site and Si in the tetrahedral B site. Through A and B site-disorder, the inverse spinel has four-coordinated A cations and the six-coordinated site hosts a mixture of A and B cations. This process affects the density and impedance contrasts across the boundaries in the transition zone and seismic-wave velocities in this portion of the Earth. We report the first synthesis at high pressure (20 GPa) and high temperature (1600 °C) of a Cr-bearing ringwoodite with a completely inverse-spinel structure. Chemical, structural, and computational analysis confirm the stability of inverse ringwoodite and add further constraints to the subduction history of the Luobusa peridotite of the Tibetan ophiolites.
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1 Dipartimento di Scienze della Terra, Università di Firenze, Florence, Italy; CNR-Istituto di Geoscienze e Greorisorse, Florence, Italy
2 ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, Australia
3 School of Earth Sciences, Ohio State University, Columbus, Ohio, USA
4 Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, Moscow, Russia; Department of Petrology, Geological Faculty, Moscow State University, Moscow, Russia
5 Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, Moscow, Russia; Department of Petrology, Geological Faculty, Moscow State University, Moscow, Russia; Institute of Experimental Mineralogy of Russian Academy of Sciences, Chernogolovka, Russia
6 Geodynamics Research Center, Ehime University, Matsuyama, Japan; Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo, Japan