Phase relations of bridgmanite, the most abundant mineral in the Earth's lower mantle.

ABSTRACT: The knowledge of phase relations of constitutive minerals is essential to investigate the structure, dynamics and evolution of the Earth and planetary interiors. This paper reviews the phase relations of bridgmanite, the most abundant mineral in the Earth's lower mantle, with an ideal composition of MgSiO₃. Bridgmanite has an orthorhombic structure with larger dodecahedral A and smaller octahedral B cation sites. The A-sites can incorporate Mg²⁺, Fe²⁺, Fe³⁺, and Al³⁺, while the B-sites accommodate Si⁴⁺, Al³⁺ and Fe³⁺. The incorporation of hydrogen and large cations like Ca is likely limited, although these issues are still debated. Al³⁺ and Fe³⁺, respectively, can form the charge-c

SUBMITTER: Katsura T 

PROVIDER: S-EPMC11787361 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature