Инд. авторы:	Kostrovitsky S.I., Solov'eva L.V., Yakovlev D.A., Suvorova L.F., Sandimirova G.P., Travin A.V., Yudin D.S.
Заглавие:	Kimberlites and megacrystic suite: Isotope-geochemical studies
Библ. ссылка:	Kostrovitsky S.I., Solov'eva L.V., Yakovlev D.A., Suvorova L.F., Sandimirova G.P., Travin A.V., Yudin D.S. Kimberlites and megacrystic suite: Isotope-geochemical studies // Petrology. - 2013. - Vol.21. - Iss. 2. - P.127-144. - ISSN 0869-5911. - EISSN 1556-2085.
Внешние системы:	DOI: 10.1134/S0869591113020057; SCOPUS: 2-s2.0-84874864708;
Реферат:	eng: Major and rare-earth element data on Cr-poor megacrystic suite from Yakutian kimberlites were generalized. Sr-Nd isotopes were studied in garnet, clinopyroxene, and phlogopite megacrysts as well as in garnet and clinopyroxene from deformed xenoliths. It was shown that Sr-Nd composition of these minerals is similar to that in the least altered diamondiferous kimberlites. The crystallization age of megacrystic minerals was determined by Rb-Sr isochron and Ar-Ar (for phlogopite megacrysts) methods. Obtained data indicate that crystallization of Cr-poor megacrystic suite began at the prekimberlitic stage and continued to the pipe emplacement. It was established that garnets from coarse-porphyric deformed lherzolites and megacrysts are similar in major and rare-earth element compositions and were derived from a common asthenospheric source. However, the distribution of incompatible elements and P-T estimates of crystallization cannot be explained by hypothesis of fractional crystallization of garnet megacrysts. It is suggested that megacrystic assemblage crystallized directly in asthenospheric melt. En route to the surface, this melt caused a metasomatic reworking of lithospheric mantle, on the one hand, and was enriched in Mg and Cr owing to the contamination by lithospheric material, on the other hand. © 2013 Pleiades Publishing, Ltd.
Издано:	2013
Физ. характеристика:	с.127-144