ON THE POSSIBILITY OF PHASE TRANSITIONS WITH THE FORMATION OF SiO2 PEROXIDE FORMS IN THE EARTH MANTLE AND THEIR EFFECT ON MANTLE CONVECTION
R. G. Khlebopros1,2, V. E. Zakhvataev1,2, V. P. Slepkov3, M. I. Kuzmin4
1Siberian Federal University, Krasnoyarsk, Russia
2Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia
3Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
4Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia
Keywords: фазовые переходы, пероксидные формы, мантийная конвекция, phase transitions, peroxide forms, mantle convection
Abstract
Based on the hypothesis advanced by S. P. Gabuda that the SiO2 molecule could undergo a transition from the linear form to the isomeric form with a ring-shaped (bent) structure, an idea is proposed that when the mantle substance melts, a phase transition of the bent SiO2 form into the linear SiO2 form can occur in the lower mantle. This phase transition might be of great importance for the lower-mantle convection processes and also for the rise of mantle plumes carrying both heat energy, and broad range of platinum group and rare elements to the Earth surface.
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