Инд. авторы:	Литасов К.Д., Бадюков Д.Д.
Заглавие:	Рамановская спектроскопия фаз высокого давления в ударно-метаморфизованном l6 хондрите nwa 5011
Библ. ссылка:	Литасов К.Д., Бадюков Д.Д. Рамановская спектроскопия фаз высокого давления в ударно-метаморфизованном l6 хондрите nwa 5011 // Геохимия. - 2019. - Т.64. - № 8. - С.848-858. - ISSN 0016-7525.
Внешние системы:	РИНЦ: 39257105;
Реферат:	eng: In the paper we present results of studies of thick shock melt veins in NWA 5011 L6 chondrite. The veins contain a wide variety of high-pressure phases that correspond to contrast values of pressure-temperature parameters on equilibrium phase diagrams. Olivine was transformed to ringwoodite and wadsleyte, orthopyroxene to majorite, akimotoite, and bridgmanite glass, maskelenite is converted to jadeite (+SiO2) and lingunite, apatite to tuite, and chromite to the phase with the calcium ferrite (mCF-FeCr2O4) structure. ) The peak PT shock parameters for NWA 5011 seem highest among the ones for other shocked chondrites according to wide occurrence of lingunite and bridgmanite glass and are considerable higher than 25 GPa and 2500 K. Akimotoite crystals in a quenched matrix of shock melt veins were found for the first time. Probably, they initially crystallized as bridgmanite, since akimotoite is not a liquidus phase in related systems. Plagioclase-chromite aggregates have been established, which characterize the late stages of the shock process and are formed during successive crystallization from isolated pockets of the impact melt. rus: В работе приводятся результаты исследования крупных ударно-расплавных жил в L6 хондрите NWA 5011. В них установлено широкое разнообразие высокобарических фаз, которые отвечают контрастным значениям РТ-параметров на равновесных фазовых диаграммах. По оливину образуются рингвудит и вадслеит, по ортопироксену - мэйджорит, акимотоит и бриджманитовое стекло, по маскелиниту - жадеит (+SiO2) и лингунит, по апатиту - туит, по хромиту - фаза со структурой феррита кальция (mCF-FeCr2O4). Пиковые параметры для хондрита NWA 5011 являются одними из самых высоких среди ранее исследованных хондритов судя по широкому развитию лингунита и бриджманитового стекла и составляют существенно выше 25 ГПа и 2500 К. Впервые описаны кристаллы акимотоита в закаленной матрице ударно-расплавных жил. Вероятно, они первоначально кристаллизовались в виде бриджманита, так как акимотоит не является ликвидусной фазой в родственных системах. Установлены плагиоклаз-хромитовые агрегаты, которые характеризуют поздние стадии ударного процесса и образуются при последовательной кристаллизации из изолированных порций ударного расплава.
Ключевые слова:	хондрит; рингвудит; мэйджорит; акимотоит; бриджманит; ударный метаморфизм; meteorite; chondrite; ringwoodite; majorite; Akimotoite; bridgmanite; shock metamorphism; метеорит;
Издано:	2019
Физ. характеристика:	с.848-858
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