Natural Fe-bearing aluminous bridgmanite in the Katol L6 chondrite Article Swipe
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· 2021
· Open Access
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· DOI: https://doi.org/10.1073/pnas.2108736118
· OA: W3203570807
Significance Bridgmanite is the most volumetrically abundant mineral of the Earth’s interior, and it is important to understand its formation mechanism to better comprehend the origin and evolution of planetary interiors. Natural bridgmanites have been reported in only a few shocked meteorites; however, the composition of these specimens differs from plausible compositions of terrestrial bridgmanite. This study reports a natural occurrence of bridgmanite, observed in an ordinary chondrite, with a composition closest to the bridgmanite present in the Earth’s lower mantle. The bridgmanite in the Katol chondrite has high Fe 3+ /ΣFe ratio and agrees with experimental predictions. The Katol chondrite may serve as a unique analogue for crystallization of bridgmanite during the final stages of magma ocean crystallization of the Earth.
