Инд. авторы:	Tomilenko A.A., Kovyazin S.V., Pokhilenko L.N., Sobolev N.V.
Заглавие:	Silicate globules in kyanite from grospydites of the Zagadochnaya kimberlite pipe, Yakutia: The problem of the origin
Библ. ссылка:	Tomilenko A.A., Kovyazin S.V., Pokhilenko L.N., Sobolev N.V. Silicate globules in kyanite from grospydites of the Zagadochnaya kimberlite pipe, Yakutia: The problem of the origin // Doklady Earth Sciences. - 2011. - Vol.436. - Iss. 1. - P.98-101. - ISSN 1028-334X. - EISSN 1531-8354.
Внешние системы:	DOI: 10.1134/S1028334X1101020X; SCOPUS: 2-s2.0-79952744292;
Реферат:	eng: The results of complex study of silicate globules and α-quartz paramorphs after coesite in kyanite from grospydites from the Zagadochnaya kimberlite pipe, Yakutia, using optical and scanning electron spectroscopy, electron and ion microprobes, LA ICP MS and Raman spectroscopy, are presented. The existence of radial fractures diverging from silicate globules into the matrix (kyanite) attests to the fact that the content of the globules is extremely condensed. A zonal structure is usually typical for globules: a coat and a core, which can be explicitly distinguished under the electron microscope, can be differentiated in them. Compositionally, the coat of the globule corresponds to potassium feldspar (wt %: 66.4 SiO2; 16.9 Al 2O3; 0.4 FeO; 0.1 CaO; 0.2 Na2O; 14.7 K 2O). The globules were also detected in which along with K, a high content of Na and Ca was also ascertained in the silicate coat. The globule coat is considerably enriched with Ba, La, Ce, Nb, and a number of other noncompatible elements as compared with xenolith minerals. The water content in globules is ∼0.6 wt %. As compared with the host mineral (kyanite), the core part of the globules is also enriched with Co, Ni, Zn, and Cu; their content in kyanite is negligibly low. The entire data collection attests to the fact that the formation of silicate globules could have been caused by interaction of the conservated fluid and/or water-silicate melt with the host mineral and crystalline inclusions of clinopyroxene and garnet with decreasing pressure during the transportation of grospydite xenoliths by the kimberlite melt to the Earth's surface. © 2011 Pleiades Publishing, Ltd.
Ключевые слова:	Russian Federation; Raman spectroscopy; kyanite; kimberlite; inductively coupled plasma method; geochemistry; coesite; Water content; Silicon compounds; Silicate minerals; Raman spectroscopy; Quartz; Pipe linings; Minerals; Iron oxides; Igneous rocks; Sakha; Barium; Zonal structure; Yakutia; Silicate melts; Scanning electrons; Radial fractures; Potassium feldspar; Micro-probes; matrix; La-ICP-MS; Kimberlite pipes; High-content; Earth's surface; Data collection; Core part; Clinopyroxenes; Electron spectroscopy;
Издано:	2011
Физ. характеристика:	с.98-101