Iron disproportionation in peridotite fragments from the mantle transition zone

Fabin Pan, Xiang Wu (), Chao Wang, Yanfei Zhang, Yiping Yang, Xiaobo He, Chong Jin, Lian Zhou, Hongfei Zhang, Hongping He and Junfeng Zhang ()
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Fabin Pan: China University of Geosciences
Xiang Wu: China University of Geosciences
Chao Wang: China University of Geosciences
Yanfei Zhang: China University of Geosciences
Yiping Yang: Chinese Academy of Sciences
Xiaobo He: Zhejiang Ocean University
Chong Jin: Zhejiang Institute of Geosciences
Lian Zhou: China University of Geosciences
Hongfei Zhang: China University of Geosciences
Hongping He: Chinese Academy of Sciences
Junfeng Zhang: China University of Geosciences

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Previous high-temperature-pressure experiments predicted metallic iron’s potential presence in the deep mantle below 250 km, arising from ferrous disproportionation in silicates, which could profoundly impact the redox environment and physicochemical properties. However, direct natural petrological evidence has been lacking, except scant clues like Fe-alloy inclusions in ultradeep diamonds. Here we present peridotite fragments, found in Cenozoic basalts from eastern China, containing decomposed Na-rich majoritic garnets (from depths of 410-550 km) and olivine with Fe0-spinel-bearing inclusions, likely originated from retrograded wadsleyite/ringwoodite. Enriched Zn-Sr isotopic compositions of the decomposed garnet indicate an origin associated with the stagnant Pacific slab in the mantle transition zone. Disproportionation of iron is evidenced by widely distributed submicron-sized spherical Fe-Ni alloys and Fe3+-rich (Fe3+/ΣFe = 0.35-0.40) olivine. These findings provide compelling evidence for recycling of stagnant slab components in the eastern Asia big mantle wedge (BMW), and iron disproportionation in the deep mantle.

Date: 2025
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DOI: 10.1038/s41467-025-60566-y

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