Инд. авторы:	Solovev K.A., Golovin A.V., Sharygin I.S., Pokhilenko N.P.
Заглавие:	Origin of Epigenetic Iron-Rich Olivine in Lherzolite Xenolith from the Udachnaya Kimberlite Pipe (Siberian Craton)
Библ. ссылка:	Solovev K.A., Golovin A.V., Sharygin I.S., Pokhilenko N.P. Origin of Epigenetic Iron-Rich Olivine in Lherzolite Xenolith from the Udachnaya Kimberlite Pipe (Siberian Craton) // Doklady Earth Sciences. - 2021. - Vol.499. - Iss. 2. - P.619-622. - ISSN 1028-334X. - EISSN 1531-8354.
Идентиф-ры:	DOI: 10.1134/S1028334X21080183; WoS: 000693706300004;
Реферат:	eng: Olivine is the most common rock-forming mineral of the majority of the lithospheric mantle rocks beneath ancient cratons. This study provides the information about an epigenetic olivine in a lherzolite xenolith from the Udachnaya kimberlite pipe (Siberian craton), which is characterized by lower Mg# compared to the rock-forming one (Mg# = 87.4). The iron-rich olivine has been observed in the epigenetic mineral assemblage that forms a kelyphite shell around the rock-forming garnet. Olivine from the kelyphite shell occurs as both homogeneous grains (Mg# = 84.3-85.9) and zoned grains (Mg# = 85.1-87.5). The major and minor elements asymmetric zoning patterns have been found in the rock-forming olivine grains at the contact with the kelyphite shell. These olivine grains have an outer low Mg# (up to 85.9) zone at the contact with the kelyphite shell as the epigenetic olivine grains in the kelyphite shell. We suggest that the iron-rich epigenetic olivine was produced as the result of a reaction between the rock-forming garnet and the primitive kimberlite melt. During this reaction, a hybrid melt was formed in the interstitial space. The hybrid melt was iron-enriched relative to the kimberlite melt. The source of iron for the micro-portions of the interstitial hybrid melt was the rock-forming garnet.
Ключевые слова:	garnet; zoning; epigenetic minerals; reaction; kimberlite melt; LITHOSPHERIC MANTLE; olivine; LINKS; GARNET; YAKUTIA; CONSTRAINTS; METASOMATISM; PERIDOTITE; mantle xenoliths;
Издано:	2021
Физ. хар-ка:	с.619-622