Инд. авторы:	Simonov V.A., Prikhod'ko V.S., Kovyazin S.V.
Заглавие:	Genesis of platiniferous massifs in the southeastern Siberian Platform
Библ. ссылка:	Simonov V.A., Prikhod'ko V.S., Kovyazin S.V. Genesis of platiniferous massifs in the southeastern Siberian Platform // Petrology. - 2011. - Vol.19. - Iss. 6. - P.549-567. - ISSN 0869-5911. - EISSN 1556-2085.
Внешние системы:	DOI: 10.1134/S0869591111050043; SCOPUS: 2-s2.0-80855141634;
Реферат:	eng: Data obtained on melt inclusions in Cr-spinel suggest a magmatic genesis of dunite in the Konder and Inagly placer-forming platiniferous massifs in the southeastern Siberian Platform. These data make it possible to evaluate the physicochemical parameters of the magmatic processes that produced these concentrically zoned alkaline-ultrabasic complexes. The comparative analysis of the composition of the Cr-spinel with inclusions highlights remarkable differences between this mineral in the Konder and Inagli massifs, on the one hand, and in ultramafic rocks in ophiolites and the modern oceanic crust, on the other. Minute clinopyroxene crystals included in Cr-spinel from the Konder Massif have a composition and configurations of their REE patterns contrastingly different from those of clinopyroxene in basite-hyperbasite complexes of ophiolite associations but are close to those of clinopyroxene in the Kytlym and Nizhnii Tagil platiniferous massifs in the Urals. The composition of the quenched melt inclusions suggests that the chromite crystallized predominantly from picrite alkaline magmas. The concentrations of most elements in the high-Mg inclusions are close to those in biotite-pyroxene alkaline picrites, a fact testifying to the significant contribution of ultrabasic (picrite) alkaline magmatic systems to the origin of the Konder and Inagli massifs. Ion-probe analyses of the inclusions suggest that the melts were rich in water (up to 0.6 wt %). Data on the distribution of REE and other trace elements in the inclusions provide evidence of the influence of a deep plume. Our simulations with the use of the composition of the melt inclusions suggest that dunite in the Konder and Inagli massifs were produced mainly by water-bearing magmas at temperatures of 1460-1300°C. As the melts evolved to less magnesian ones, olivine continued to crystallize from them until the temperature decreased to 1230°C. © 2011 Pleiades Publishing, Ltd.
Издано:	2011
Физ. характеристика:	с.549-567