Allabogdanite, the high-pressure polymorph of (Fe,Ni)2P, a stishovite-grade indicator of impact processes in the Fe–Ni–P system

Britvin, Sergey N.; Shilovskikh, Vladimir V.; Pagano, Renato; Vlasenko, Natalia S.; Zaitsev, Anatoly N.; Krzhizhanovskaya, Maria G.; Lozhkin, Maksim S.; Zolotarev, Andrey A.; Gurzhiy, Vladislav V.

doi:10.1038/s41598-018-37795-x

Cited by 17 publications

(13 citation statements)

References 51 publications

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“…Shock-induced deformations, melt pockets, and other microstructural features are also common for iron meteorites [3][4][5]. However, there have been scarce findings of high-pressure minerals, including stishovite in group IVA iron meteorite Muonionalusta [6], (Fe,Ni) 2 P-allabogdanite in anomalous Ni-rich ataxites Onello, Santa Catharina, and Barbianello [7][8][9] and tuite in IIE iron Elga [10].…”

Section: Introductionmentioning

confidence: 99%

Fe-Ni-P-S Melt Pockets in Elga IIE Iron Meteorite: Evidence for the Origin at High-Pressures Up to 20 GPa

et al. 2019

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Here we report new data on high-pressure microstructures in Elga group IIE iron meteorites, made of solidified Fe-Ni-P-S melt pockets and microcrystalline aggregates, which could be formed only at high pressures and temperatures according to the experimental data. The bulk composition of the melt pockets and crystals correspond to the Fe3P-Fe3S solid solution with the closure of an immiscibility gap at pressures near 20 GPa in static experiments. Some other melt pockets fit with the Fe2S-Fe2P compositions, which could also correspond to high pressures and temperatures. The results suggest a late shock episode during the formation of the IIE iron parent body, which may be prior or due to the final disruption that caused the meteorite arrival to Earth. It also has an important implication to the shock features in other meteorites, such as ureilite.

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Section: Introductionmentioning

confidence: 99%

Fe-Ni-P-S Melt Pockets in Elga IIE Iron Meteorite: Evidence for the Origin at High-Pressures Up to 20 GPa

et al. 2019

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“…http://www.minsocam.org/ PHOSPHIDES Allabogdanite [(Fe,Ni) 2 P]: Impact allabogdanite was discovered as elongated crystals in the Onello Ni-rich ataxite meteorite by Britvin et al (2002), who originally ascribed it to primary asteroidal origins. Subsequent experimental research (Dera et al 2008) and observations of natural material from several other occurrences (Britvin et al 2019;Litasov et al 2019) revealed allabogdanite to be a very-high-pressure impact phase in the Fe-Ni-P system.…”

Section: Chaoite (C)mentioning

confidence: 97%

An evolutionary system of mineralogy, Part IV: Planetesimal differentiation and impact mineralization (4566 to 4560 Ma)

Morrison

Hazen

2021

American Mineralogist

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The fourth installment of the evolutionary system of mineralogy considers two stages of planetesimal mineralogy that occurred early in the history of the solar nebula, commencing by 4.566 Ga and lasting for at least 5 million years: (1) primary igneous minerals derived from planetesimal melting and differentiation into core, mantle, and basaltic components; and (2) impact mineralization resulting in shock-induced deformation, brecciation, melting, and highpressure phase transformations. We tabulate 90 igneous differentiated asteroidal minerals, including the earliest known occurrences of minerals with Ba, Cl, Cu, F, and V as essential elements, as well as the first appearances of numerous phosphates, quartz, zircon, and amphibole group minerals. We also record 40 minerals formed through high-pressure impact alteration, commencing with the period of asteroid accretion and differentiation. These stages of mineral evolution thus mark the first time that high pressures, both static and dynamic, played a significant role in mineral paragenesis.

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“…It can be seen that the twin boundaries of allabogdanite domains do not coincide with, but instead penetrate or abut the habit and interphase boundaries of phosphide grains. The occurrence of twinning distinguishes terrestrial allabogdanite from the mineral of meteoritic origin (Britvin et al 2019b) which always appear as single crystals ( Figure 6).…”

Section: Chemical Composition and Structural Studymentioning

confidence: 99%

“…Allabogdanite (orthorhombic, structure type Co 2 Si) and barringerite (hexagonal, structure type Fe 2 P) are polymorphs of Fe 2 P. The relationship between their unit cells is sketched in Figure 2. Both minerals commonly contain Ni substituting for Fe (Britvin et al 2019b(Britvin et al , 2020c. Barringerite was discovered in the Ollague pallasite (Buseck 1969).…”

Section: Introductionmentioning

confidence: 99%

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Discovery of terrestrial allabogdanite (Fe,Ni)2P, and the effect of Ni and Mo substitution on the barringerite-allabogdanite high-pressure transition

Britvin

Vereshchagin

Shilovskikh

et al. 2021

American Mineralogist

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Minerals formed at high pressures are sensitive indicators of extreme pressure-temperature conditions that occur in nature. The discovery of the high-pressure polymorph of (Fe,Ni) 2 P, allabogdanite in the surficial pyrometamorphic rocks of the Hatrurim Formation (the Mottled Zone) surrounding the Dead Sea basin in Israel is the first terrestrial occurrence of a mineral previously only found in iron meteorites. Stepwise annealing experiments demonstrate that allabogdanite is metastable at ambient pressure and that it irreversibly transforms into its low-pressure polymorph, barringerite, upon heating to 850±50°C. High-pressure high-temperature diamond-anvil cell (DAC) experiments confirm the results of annealing experiments. The DAC data indicate that Hatrurim allabogdanite is metastable below 7.4 GPa, and the low-to high-pressure phase transition (barringerite→allabogdanite) occurs at 25±3 GPa and 1400±100°C. The observed transition pressure of Hatrurim allabogdanite is significantly higher than that of pure synthetic Fe 2 P (8 GPa), due to partial substitution of Fe for Ni (4 wt.%) and Mo (2.5 wt.%). Because the influence of substituting impurities on the conditions of phase transitions can be unexpectedly strong, our findings confirm that caution should be exercised when extrapolating data from experiments on synthetic compounds to natural systems. Based on the discovery of terrestrial allabogdanite (Fe,Ni) 2 P coupled with experiments probing the phase transitions in this natural composition, we contend that terrestrial allabogdanite formed via transformation from barringerite and posit potential scenarios of its formation.

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Allabogdanite, the high-pressure polymorph of (Fe,Ni)2P, a stishovite-grade indicator of impact processes in the Fe–Ni–P system

Cited by 17 publications

References 51 publications

Fe-Ni-P-S Melt Pockets in Elga IIE Iron Meteorite: Evidence for the Origin at High-Pressures Up to 20 GPa

Fe-Ni-P-S Melt Pockets in Elga IIE Iron Meteorite: Evidence for the Origin at High-Pressures Up to 20 GPa

An evolutionary system of mineralogy, Part IV: Planetesimal differentiation and impact mineralization (4566 to 4560 Ma)

Discovery of terrestrial allabogdanite (Fe,Ni)2P, and the effect of Ni and Mo substitution on the barringerite-allabogdanite high-pressure transition

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