Инд. авторы:	Vasilenko V.B., Kuznetsova L.G., Minin V.A., Tolstov A.V.
Заглавие:	Behavior of major and rare-earth elements during the postmagmatic alteration of kimberlites
Библ. ссылка:	Vasilenko V.B., Kuznetsova L.G., Minin V.A., Tolstov A.V. Behavior of major and rare-earth elements during the postmagmatic alteration of kimberlites // Russian Geology and Geophysics. - 2012. - Vol.53. - Iss. 1. - P.62-76. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2011.12.005; SCOPUS: 2-s2.0-84855172694;
Реферат:	eng: During serpentinization and subsequent alteration in the absence of brucite, kimberlites accumulate uncompensated silica. Its amount can be calculated from the average compositions of the rock-forming minerals (olivine, calcite, phlogopite) and the chemical compositions of the rocks. The contents of rock-forming oxides and REE were determined in 12 kimberlite pipes of the Yakutian kimberlite province, in 413 samples from secondary-alteration zones and of unaltered kimberlites. Columns of successive kimberlite alterations were constructed for each pipe on the basis of secondary-quartz data; here, the behavior of rock-forming oxides and REE was assessed. All the studied rocks had experienced different degrees of postmagmatic hydrothermal metasomatism at different depths in all the pipes. The changes were reflected in the supply/loss of rock-forming oxides and REE. The supply of REE during the hydrothermal metasomatism enriched the kimberlites with TiO 2, P 2O 5, and CaO. During the removal of REE, most of the rock-forming oxides were partially lost. The maximum REE supply was 67% in the Udachnaya-Vostochnaya pipe and 59% in the Nyurbinskaya pipe as compared with the unaltered kimberlites. The maximum REE loss was 87% in the Aikhal pipe and 81% in the Internatsional'naya pipe as compared with the unaltered kimberlites. The initial REE contents of the postmagmatically altered kimberlites changed considerably in all the studied cases. This conclusion was drawn owing to the use of normative-quartz content as a criterion for secondary alteration. © 2011 Elsevier B.V.
Ключевые слова:	Russian Federation; serpentinization; rare earth element; quartz; oxide; metasomatism; magma; kimberlite; Sakha; brucite; Supply and loss; Rock-forming oxides; REE; Postmagmatic metasomatism; Normative quartz; Kimberlite; chemical composition;
Издано:	2012
Физ. характеристика:	с.62-76