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
Institute of Earth Sciences, Saint-Petersburg State University, Universitetskaya Nab. 7/9, 199034, St. Petersburg, Russia.
Kola Science Center of Russian Academy of Sciences, Fersman Str. 14, 184209, Apatity, Murmansk Region, Russia.
Sci Rep. 2019 Jan 31;9(1):1047. doi: 10.1038/s41598-018-37795-x.
Allabogdanite, (Fe,Ni)P, is the only known natural high-pressure phase reported in the Fe-Ni-P system. The mineral, which was previously described from a single meteorite, the Onello iron, is now discovered in the Santa Catharina and Barbianello nickel-rich ataxites. The occurrence of allabogdanite in Santa Catharina, one of the largest and well-studied meteorites, suggests that this mineral is more common than was believed. The formation of allabogdanite-bearing phosphide assemblages in a given meteorite provides evidence that it experienced peak pressure of at least 8 GPa at a temperature above 800 °C. Since the pressure-temperature stability parameters of allabogdanite fall within the margins of the stishovite (rutile-type SiO) stability area, the former can be employed as a convenient stishovite-grade indicator of significant impact events experienced by iron and stony-iron meteorites and their parent bodies.
铁镍磷矿（(Fe,Ni)P）是铁-镍-磷体系中唯一已知的天然高压相。这种矿物此前仅在一块名为奥内洛铁陨石中被描述过，如今在圣卡塔琳娜和巴尔比亚内洛富镍无球粒陨石中也有发现。在最大且研究充分的陨石之一圣卡塔琳娜中发现了铁镍磷矿，这表明该矿物比人们之前认为的更为常见。特定陨石中含铁镍磷矿的磷化物组合的形成，证明它在温度高于800°C时经历了至少8吉帕的峰值压力。由于铁镍磷矿的压力-温度稳定性参数处于斯石英（金红石型SiO₂）稳定区域范围内，所以前者可作为铁陨石和石铁陨石及其母体经历重大撞击事件的便捷斯石英等级指示物。
