Инд. авторы:	Hanski E., Kamenetsky V.S., Luo Z.-Y., Xu Y.-G., Kuzmin D.V.
Заглавие:	Primitive magmas in the Emeishan Large Igneous Province, southwestern China and northern Vietnam
Библ. ссылка:	Hanski E., Kamenetsky V.S., Luo Z.-Y., Xu Y.-G., Kuzmin D.V. Primitive magmas in the Emeishan Large Igneous Province, southwestern China and northern Vietnam // Lithos. - 2010. - Vol.119. - Iss. 1-2. - P.75-90. - ISSN 0024-4937. - EISSN 1872-6143.
Внешние системы:	DOI: 10.1016/j.lithos.2010.04.008; РИНЦ: 15335122; SCOPUS: 2-s2.0-77956477505;
Реферат:	eng: There are several places in the Emeishan Large Igneous Province (ELIP) where highly magnesian volcanic or intrusive rocks accompany more abundant flood basalts. The high-Mg rocks vary in composition from LREE-depleted, low-Ti komatiites to LREE-enriched, high-Ti picrites. These magmas carried cognate olivine phenocrysts with Fo content higher than 91mol% indicating that these olivines crystallized and equilibrated with high-Mg melts. The maximum measured Fo content from the Dali area is 93.5mol% which, depending on the KD value used, indicates a MgO content of 23-25wt.% for the parental melt. The high estimated MgO wt.% values provide evidence for a hot portion of the Emeishan mantle-plume head with a potential mantle temperature of ca. 1700°C. Melt inclusions trapped within olivine phenocrysts have compositions similar to those of the host lavas but with a higher variability in the abundance of incompatible trace elements. The inclusions yield a calculated maximum MgO content of ca. 22wt.% for the melt. The compositional and isotopic variability of the high-Mg magmas in the ELIP is akin to that observed in basaltic rocks, which are divided into low-Ti and high-Ti types, suggesting that most of the basalts were developed in deep crustal magma chambers by fractional crystallization and mixing processes from primitive magmas. © 2010 Elsevier B.V.
Ключевые слова:	magma; magma chamber; mantle plume; melt inclusion; mixing; olivine; Permian; picrite; trace element; volcanic rock; China; Yunnan; Viet Nam; Sichuan; Emeishan; Dali; large igneous province; komatiite; igneous intrusion; fractional crystallization; flood basalt; Picrite; Permian; Olivine; Melt inclusion; Komatiite; Emeishan; lava; China;
Издано:	2010
Физ. характеристика:	с.75-90