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- W145330711 abstract "Sublithospheric diamonds are typically Type II, frequently exhibit complex zoning, and sometimes contain mineral inclusions that can potentially reveal deep mantle lithologies and petrologic processes. A considerable number of these diamonds contain inclusions with elemental stoichiometries consistent with transition zone (e.g. majoritic garnet, Ca-perovskite) and lower mantle phases (e.g. Mg-perovskite, Ca-perovskite, (Mg,Fe)-periclase) [1]. Carich perovskites, some containing considerable CaTiO3 component, almost invariably have very low Mg contents, unlike what would be expected in solid lower mantle peridotitic or basaltic lithologies, but have elevated incompatible elements abundances that almost certainly indicate crystallization from a low-degree Ca-rich partial melt [2,3]. High-Ca majoritic garnets also have both major and trace element characteristics indicating the role of lowdegree, Ca-rich partial melts [3,4], and in some cases calculated melts likely formed in subducted oceanic crust or lithosphere [3]. Given that diamond crystallized syngenetically with the inclusions, crystallization from carbonated melts is implicated. The reducing conditions expected in the ambient transition zone and lower mantle [5] could promote reduction of the carbonate component in slab-derived, carbonated (oxidized), partial melts. Reduction can lead to diamond and perovskite crystallization from the melt, possibly with H2O as a by-product through a reaction such as:" @default.
- W145330711 created "2016-06-24" @default.
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- W145330711 date "2010-05-01" @default.
- W145330711 modified "2023-09-28" @default.
- W145330711 title "Perovskite inclusions in deep mantle diamonds and the fate of subducted lithosphere" @default.
- W145330711 hasPublicationYear "2010" @default.
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