Spectroscopic features of ultrahigh-pressure impact glasses of the Kara astrobleme.

Autor:	Shumilova TG; Institute of Geology, Komi Scientific Center of Ural Division of Russian Academy of Sciences, Pervomayskaya st. 54, Syktyvkar, 167982, Russia. tg_shumilova@mail.ru.; Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, 1680 East-West Road, Honolulu, HI, 96822, USA. tg_shumilova@mail.ru., Lutoev VP; Institute of Geology, Komi Scientific Center of Ural Division of Russian Academy of Sciences, Pervomayskaya st. 54, Syktyvkar, 167982, Russia., Isaenko SI; Institute of Geology, Komi Scientific Center of Ural Division of Russian Academy of Sciences, Pervomayskaya st. 54, Syktyvkar, 167982, Russia., Kovalchuk NS; Institute of Geology, Komi Scientific Center of Ural Division of Russian Academy of Sciences, Pervomayskaya st. 54, Syktyvkar, 167982, Russia., Makeev BA; Institute of Geology, Komi Scientific Center of Ural Division of Russian Academy of Sciences, Pervomayskaya st. 54, Syktyvkar, 167982, Russia., Lysiuk AY; Institute of Geology, Komi Scientific Center of Ural Division of Russian Academy of Sciences, Pervomayskaya st. 54, Syktyvkar, 167982, Russia., Zubov AA; Institute of Geology, Komi Scientific Center of Ural Division of Russian Academy of Sciences, Pervomayskaya st. 54, Syktyvkar, 167982, Russia., Ernstson K; Faculty of Philosophy I, University of Würzburg, Würzburg, Germany.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2018 May 02; Vol. 8 (1), pp. 6923. Date of Electronic Publication: 2018 May 02.
DOI:	10.1038/s41598-018-25037-z
Abstrakt:	The state of substances under ultrahigh pressures and temperatures (UHPHT) now raises a special interest as a matter existing under extreme conditions and as potential new material. Under laboratory conditions only small amounts of micrometer-sized matter are produced at a pressure up to 100 GPa and at room temperature. Simultaneous combination of ultrahigh pressures and temperatures in a lab still requires serious technological effort. Here we describe the composition and structure of the UHPHT vein-like impact glass discovered by us in 2015 on the territory of the Kara astrobleme (Russia) and compare its properties with impact glass from the Ries crater (Germany). A complex of structural and spectroscopic methods presents unusual high pressure marks of structural elements in 8-fold co-ordination that had been described earlier neither in synthetic nor natural glasses. The Kara natural UHPHT glasses being about 70 Ma old have well preserved initial structure, presenting some heterogeneity as a result of partial liquation and crystallization differentiation where an amorphous component is proposed to originate from low level polymerization. Homogeneous parts of the UHPHT glasses can be used to deepened fundamental investigation of a substance under extreme PT conditions and to technological studies for novel material creations.
Databáze:	MEDLINE
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