TY  - JOUR
AU  - Britvin, Sergey
AU  - Vereshchagin, Oleg
AU  - Krzhizhanovskaya, Maria
AU  - Gorelova, Liudmila
AU  - Pakhomova, Anna
AU  - Bykov, Maxim
AU  - Shilovskikh, Vladimir V.
AU  - Vlasenko, Natalia S.
AU  - Zaitsev, Anatoly N.
AU  - Zolotarev, Andrey A.
AU  - Lozhkin, Maksim S.
AU  - Nestola, Fabrizio
TI  - Discovery of terrestrial allabogdanite (Fe,Ni)<sub>2</sub>P, and the effect of Ni and Mo substitution on the barringerite-allabogdanite high-pressure transition
JO  - American mineralogist
VL  - 105
SN  - 1945-3027
CY  - Alexandria, Va.
PB  - GeoScienceWorld
M1  - PUBDB-2020-03569
SP  - 1-35 
PY  - 2020
N1  - Paper ahead of print
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)<sub>2</sub>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<sub>2</sub>P (8 GPa), due to partial substitution of Fe for Ni (4 wt.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000673958300009
DO  - DOI:10.2138/am-2021-7621
UR  - https://bib-pubdb1.desy.de/record/449035
ER  -