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- Title
The stishovite paradox in the evolution of lower mantle magmas and diamond-forming melts (experiment at 24 and 26 GPa).
- Authors
Litvin, Yu.; Spivak, A.; Simonova, D.; Dubrovinsky, L.
- Abstract
Experimental studies of phase relations in the oxide-silicate system MgO-FeO-SiO 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-(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.
- Subjects
MAGMAS; BRIDGMANITE; DIAMONDS; SILICATES; PERITECTIC reactions
- Publication
Doklady Earth Sciences, 2017, Vol 473, Issue 2, p444
- ISSN
1028-334X
- Publication type
Article
- DOI
10.1134/S1028334X17040122