Инд. авторы:	Starikova A.E., Prokopyev I.R, Doroshkevich A.G., Ragozin A.L., Chervyakovsky V.
Заглавие:	Polygenic Nature of Olivines from the Ultramafic Lamprophyres of the Terina Complex (Chadobets Upland, Siberian Platform) Based on Trace Element Composition, Crystalline, and Melt Inclusion Data
Библ. ссылка:	Starikova A.E., Prokopyev I.R, Doroshkevich A.G., Ragozin A.L., Chervyakovsky V. Polygenic Nature of Olivines from the Ultramafic Lamprophyres of the Terina Complex (Chadobets Upland, Siberian Platform) Based on Trace Element Composition, Crystalline, and Melt Inclusion Data // MINERALS. - 2021. - Vol.11. - Iss. 4. - Art.408.
Идентиф-ры:	DOI: 10.3390/min11040408; РИНЦ: 46774669; WoS: 000643332100001;
Реферат:	eng: Olivine from the deep mantle-derived rocks, such as ultramafic lamprophyres, carries important information about the composition of the mantle source, the processes of mantle metasomatism, the origin of specific silicate-carbonate melts, as well as the composition and mechanisms of crystallization of these rocks. Textures and compositions of olivine from the carbonate-rich ultramafic lamprophyres (aillikites) of the Terina complex, along with their mineral and melt inclusions, exposed that olivines have different sources. Two populations of olivines were considered: macrocrysts (>1 mm) and groundmass olivines (<1 mm). Groundmass olivines are phenocrysts and characterized by weak variations in Mg# (84-86.5), a sharp increase in Ca and Ti contents, and a decrease in Ni and Cr from core to rim. They have higher concentrations of Li, Cu, Ti, and Na compared to macrocrysts. Among the macrocrysts, the following populations are observed: (1) high-Mg olivines (Mg# 89-91) with high Ni and low Ti contents, which are interpreted as xenocrysts from the slightly depleted lherzolite mantle; (2) high-Ca olivines (Mg# 84-88, CaO 0.13-0.21 wt %), which have patterns similar to groundmass olivines and are interpreted as cumulates of early portions of aillikite melt; (3) macrocrysts with wide variations in Mg# (73-88), low CaO contents (0.04-0.11 wt %), and positive slope in Ca vs. Al and negative slope in Ca vs. Mn, which are interpreted as disintegrated megacrysts from the Cr-poor megacryst suite. The megacryst suite could have been formed in the pre-trap period during the melting of the metasomatized subcontinental lithospheric mantle (SCLM). The aillikite melt evolution is traced by secondary melt inclusions in olivine macrocrysts: early phlogopite-diopside-calcite-apatite association, containing Ti-magnetite and ilmenite, is followed by an association with magnetite and sulfides (pyrrhotite and pentlandite); finally, at a late stage, inclusions with a predominance of Ca-Na-carbonates and sulfates and enriched in U, Th, Y, REEs, Sr, and Ba were captured.
Ключевые слова:	melt inclusion; ultramafic lamprophyre; aillikite; Siberian craton; MONASTERY KIMBERLITE; PETROLOGY; MINERALOGY; MEGACRYSTS; METASOMATISM; FLUID; ORIGIN; IGNEOUS ROCKS; FLOOD BASALTS; LITHOSPHERIC MANTLE; olivine;
Издано:	2021
Физ. хар-ка:	408
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