An occurrence of tuite, γ-Ca3(PO4)2, partly transformed from Ca-phosphates in the Suizhou meteorite

Xiande Xie; Xiangping Gu; Ming Chen

doi:10.1111/maps.12577

An occurrence of tuite, γ-Ca3(PO4)2, partly transformed from Ca-phosphates in the Suizhou meteorite

Meteoritics and Planetary Science ◽

10.1111/maps.12577 ◽

2015 ◽

Vol 51 (1) ◽

pp. 195-202 ◽

Cited By ~ 8

Author(s):

Xiande Xie ◽

Xiangping Gu ◽

Ming Chen

Keyword(s):

Suizhou Meteorite

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Natural high-pressure polymorph of merrillite in the shock veins of the Suizhou meteorite

Geochimica et Cosmochimica Acta ◽

10.1016/s0016-7037(02)00833-5 ◽

2002 ◽

Vol 66 (13) ◽

pp. 2439-2444 ◽

Cited By ~ 56

Author(s):

Xiande Xie ◽

Michelle E. Minitti ◽

Ming Chen ◽

H.o-kwang Mao ◽

Deqiang Wang ◽

...

Keyword(s):

High Pressure ◽

Suizhou Meteorite

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Evidence for the charge disproportionation of iron in extraterrestrial bridgmanite

Science Advances ◽

10.1126/sciadv.aay7893 ◽

2020 ◽

Vol 6 (2) ◽

pp. eaay7893 ◽

Cited By ~ 2

Author(s):

Luca Bindi ◽

Sang-Heon Shim ◽

Thomas G. Sharp ◽

Xiande Xie

Keyword(s):

High Pressure ◽

Metallic Iron ◽

Valence State ◽

Lower Mantle ◽

Direct Evidence ◽

Mixed Valence ◽

Disproportionation Reaction ◽

Redox Processes ◽

Charge Disproportionation ◽

Suizhou Meteorite

Bridgmanite, MgSiO3 with perovskite structure, is considered the most abundant mineral on Earth. On the lower mantle, it contains Fe and Al that strongly influence its behavior. Experimentalists have debated whether iron may exist in a mixed valence state, coexistence of Fe2+ and Fe3+ in bridgmanite, through charge disproportionation. Here, we report the discovery of Fe-rich aluminous bridgmanite coexisting with metallic iron in a shock vein of the Suizhou meteorite. This is the first direct evidence in nature of the Fe disproportionation reaction, which so far has only been observed in some high-pressure experiments. Furthermore, our discovery supports the idea that the disproportionation reaction would have played a key role in redox processes and the evolution of Earth.

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