The stishovite paradox in the evolution of lower mantle magmas and diamond-forming melts (experiment at 24 and 26 GPa)

Experimental studies of phase relations in the oxide–silicate system MgO–FeO–SiO 2 at 24 GPa show that the peritectic reaction of bridgmanite controls the formation of stishovite as a primary in situ mineral of the lower mantle and as an effect of the stishovite paradox. The stishovite paradox is re...

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Published inDoklady earth sciences Vol. 473; no. 2; pp. 444 - 448
Main Authors Litvin, Yu. A., Spivak, A. V., Simonova, D. A., Dubrovinsky, L. S.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.04.2017
Springer
Springer Nature B.V
Subjects
Calcium
Carbonates
Crystallization
Diamonds
Earth and Environmental Science
Earth Sciences
Evolution
Forming
Geochemistry
Iron
Iron oxides
Lower mantle
Magma
Magnesium oxide
Mantle
Mantle (Geology)
Melting
Melts
Minerals
Silica
Silicates
Silicon dioxide
Solid solutions
Stishovite
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Summary:Experimental studies of phase relations in the oxide–silicate system MgO–FeO–SiO 2 at 24 GPa show that the peritectic reaction of bridgmanite controls the formation of stishovite as a primary in situ mineral of the lower mantle and as an effect of the stishovite paradox. The stishovite paradox is registered in the diamond-forming system MgO–FeO–SiO 2 –(Mg–Fe–Ca–Na carbonate)–carbon in experiments at 26 GPa as well. The physicochemical mechanisms of the ultrabasic–basic evolution of deep magmas and diamondforming media, as well as their role in the origin of the lower mantle minerals and genesis of ultradeep diamonds, are studied.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X17040122