Инд. авторы:	Lesnov F.P., Palesskii S.V., Nikolaeva I.V., Koz'menko O.A, Kuchkin A.M., Korolyuk V.N.
Заглавие:	Detailed mineralogical-geochemical study of a large spinel lherzolite xenolith in alkali basalt of shavaryn tsaram paleovolcano, Mongolia
Библ. ссылка:	Lesnov F.P., Palesskii S.V., Nikolaeva I.V., Koz'menko O.A, Kuchkin A.M., Korolyuk V.N. Detailed mineralogical-geochemical study of a large spinel lherzolite xenolith in alkali basalt of shavaryn tsaram paleovolcano, Mongolia // Geochemistry International. - 2009. - Vol.47. - Iss. 1. - P.18-40. - ISSN 0016-7029. - EISSN 1531-8397.
Внешние системы:	DOI: 10.1134/S0016702909010029; SCOPUS: 2-s2.0-59649096056;
Реферат:	eng: Mineralogical - geochemical data obtained on a large xenolith of spinel lherzolite from basanites of Shavaryn Tsaram volcano (Middle Pleistocene) provide evidence that the xenolith was affected by heat and fluid that came from the basalt melt and induced geochemical heterogeneity of the xenolith. Olivine crystals from the central portion of the xenolith contain much more CaO than this mineral from the peripheral zones of the xenolith as well as in xenocrystals of the host basalts. The large xenolith was unevenly annealed by the host basalt melt, and this predetermined the heterogeneous diffusion-controlled 'purification' of olivine crystals from their CaO admixture. The xenolith is heterogeneously enriched in LREE and some trace elements (Zr, Hf, Nb, Th, and U), and their distribution demonstrates unclearly pronounced concentric zoning: these elements enriched the outer portions of the xenolith. The enrichment of the xenolith in LREE and other mobile trace elements is explained by their occurrence not only as structurally bound (isomorphic) components in minerals but also in the form of nonstructural admixtures (contaminant), as minute grains of compounds hosted in the interstitial space and tiny cracks cutting mineral grains. The enrichment of the xenolith in these admixtures proceeded via their infiltration-controlled introduction with fluid from the basalt along minute cracks. © Pleiades Publishing, Ltd. 2009.
Ключевые слова:	Chemical elements; Cracks; Crystals; Hafnium; Land use; Metal refining; Mineralogy; Niobium; Olivine; Silica; Silicate minerals; Trace analysis; Trace elements; Zirconium; Geochemical datum; Mongolia; Far East; Eurasia; Basalt; zoning; xenolith; trace element; spinel; rare earth element; partial melting; mineralogy; melt inclusion; lherzolite; igneous geochemistry; enrichment; alkali basalt; Minerals; Olivine crystals; Mineral grains; Interstitial spaces; Geochemical heterogeneities; Alkali basalts; Asia;
Издано:	2009
Физ. характеристика:	с.18-40