Incorporation mechanism of Fe and Al into bridgmanite in a subducting mid-ocean ridge basalt and its crystal chemistry.

ABSTRACT: The compositional difference between subducting slabs and their surrounding lower-mantle can yield the difference in incorporation mechanism of Fe and Al into bridgmanite between both regions, which should cause heterogeneity in physical properties and rheology of the lower mantle. However, the precise cation-distribution has not been examined in bridgmanites with Fe- and Al-contents expected in a mid-ocean ridge basalt component of subducting slabs. Here we report on Mg_0.662Fe_0.338Si_0.662Al_0.338O₃ bridgmanite single-crystal characterized by a combination of single-crystal X-ray diffraction, synchrotron ⁵⁷Fe-Mössbauer spectroscopy and electron probe microanalysis. We find that the charge-coupled substitution ^AMg

SUBMITTER: Nakatsuka A 

PROVIDER: S-EPMC8613292 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature