Инд. авторы:	Doroshkevich A.G., Ripp G.S., Izbrodin I.A., Savatenkov V.M.
Заглавие:	Alkaline magmatism of the Vitim province, West Transbaikalia, Russia: Age, mineralogical, geochemical and isotope (O{cyrillic}, C, D, Sr and Nd) data
Библ. ссылка:	Doroshkevich A.G., Ripp G.S., Izbrodin I.A., Savatenkov V.M. Alkaline magmatism of the Vitim province, West Transbaikalia, Russia: Age, mineralogical, geochemical and isotope (O{cyrillic}, C, D, Sr and Nd) data // Lithos. - 2012. - Vol.152. - P.157-172. - ISSN 0024-4937. - EISSN 1872-6143.
Внешние системы:	DOI: 10.1016/j.lithos.2012.05.002; SCOPUS: 2-s2.0-84867444820;
Реферат:	eng: In this paper, we study the geochronology, mineral chemistry, and whole-rock elemental, stable (O, C, D) and Sr-Nd isotopic data for alkaline ultrabasic-basic massifs of the Vitim alkaline province (Sayzhenski complex) in the Central Asian Orogenic Belt, near the boundary with the Siberian craton, to evaluate their petrogenesis and geodynamic significance. U-Pb zircon dating results in Early Paleozoic (520-486Ma) and Late Paleozoic (306-294Ma) stages of alkaline rock formation. The mineralogy and geochemistry exhibit a wide range of SiO 2 (38-73wt.%), enrichment in Sr, Ba, LREE and Ta and, most significantly, in Na and Al. The rocks crystallized from a parental CO 2- and H 2O-rich silica-undersaturated melt. Isotopically, the rocks are highly variable, with ( 87Sr/ 86Sr)i - 0.705595-0.707729 and ( 143Nd/ 144Nd)i - 0.512237-0.512643. The geochemical and isotope data suggest that the rocks were derived from a source composed of three distinct components: PREMA, EM II and marine carbonate. Additionally, stable (O, C, D) isotope data display the shifting influence of assimilated organic sediments in the source of melts and a partial secondary isotope exchange between the late-magmatic fluids and minerals. © 2012 Elsevier B.V.
Ключевые слова:	magmatism; mantle source; mineralogy; neodymium isotope; Paleozoic; pyroxenite; Vitim; Sakha; Russian Federation; zircon; uranium-lead dating; strontium isotope; igneous geochemistry; geochronology; alkaline rock; age determination; Pyroxenite; Nepheline syenite; Mantle sources; Ijolite-urtite series; Assimilation; isotopic composition; Alkaline syenite;
Издано:	2012
Физ. характеристика:	с.157-172