Journal Article

PUBDB-2020-03569

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Discovery of terrestrial allabogdanite $(Fe,Ni)_{2}P$, and the effect of Ni and Mo substitution on the barringerite-allabogdanite high-pressure transition

Britvin, S. (Corresponding author)Extern* ; Vereshchagin, O.Extern* ; Krzhizhanovskaya, M.Extern* ; Gorelova, L.Extern* ; Pakhomova, A.DESY* ; Bykov, M.Extern* ; Shilovskikh, V. V. ; Vlasenko, N. S. ; Zaitsev, A. N. ; Zolotarev, A. A. ; Lozhkin, M. S. ; Nestola, F.

2020
GeoScienceWorld Alexandria, Va.

This record in other databases:      

Please use a persistent id in citations: doi:10.2138/am-2021-7621  doi:10.3204/PUBDB-2020-03569

Abstract: 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.

Note: Paper ahead of print

---

Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Experimentebetreuung PETRA III (FS-PET-D)

Research Program(s):

1. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)
2. 6G3 - PETRA III (POF3-622) (POF3-622)
3. FS-Proposal: I-20190536 (I-20190536) (I-20190536)

Experiment(s):

1. PETRA Beamline P02.2 (PETRA III)

Appears in the scientific report 2020

---

Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

---