Research output: Contribution to journal › Article › peer-review
Discovery of terrestrial allabogdanite (Fe,Ni)2P, and the effect of Ni and Mo substitution on the barringerite-allabogdanite high-pressure transition. / Britvin, Sergey N.; Vereshchagin, Oleg S.; Shilovskikh, Vladimir V.; Krzhizhanovskaya, Maria G.; Gorelova, Liudmila A.; Vlasenko, Natalia S.; Pakhomova, Anna S.; Zaitsev, Anatoly N.; Zolotarev, Andrey A.; Bykov, Maksim; Lozhkin, Maksim S.; Nestola, Fabrizio.
In: American Mineralogist, Vol. 106, No. 6, 30.07.2021, p. 944-952.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Discovery of terrestrial allabogdanite (Fe,Ni)2P, and the effect of Ni and Mo substitution on the barringerite-allabogdanite high-pressure transition
AU - Britvin, Sergey N.
AU - Vereshchagin, Oleg S.
AU - Shilovskikh, Vladimir V.
AU - Krzhizhanovskaya, Maria G.
AU - Gorelova, Liudmila A.
AU - Vlasenko, Natalia S.
AU - Pakhomova, Anna S.
AU - Zaitsev, Anatoly N.
AU - Zolotarev, Andrey A.
AU - Bykov, Maksim
AU - Lozhkin, Maksim S.
AU - Nestola, Fabrizio
PY - 2021/7/30
Y1 - 2021/7/30
N2 - 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)2P, 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 Fe2P (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)2P 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.
AB - 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)2P, 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 Fe2P (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)2P 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.
UR - https://www.mendeley.com/catalogue/9c720b28-02a3-3ab4-8003-dce941f0d910/
U2 - 10.2138/am-2021-7621
DO - 10.2138/am-2021-7621
M3 - Article
VL - 106
SP - 944
EP - 952
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 6
ER -
ID: 70122926