Инд. авторы:	Mikhailenko D.S., Golovin A.V., Korsakov A.V., Aulbach S., Gerdes A., Ragozin A.
Заглавие:	Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite
Библ. ссылка:	Mikhailenko D.S., Golovin A.V., Korsakov A.V., Aulbach S., Gerdes A., Ragozin A. Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite // MINERALS. - 2020. - Vol.10. - Iss. 4. - Art.383.
Внешние системы:	DOI: 10.3390/min10040383; РИНЦ: 43271132; WoS: 000535581500091;
Реферат:	eng: A coesite-bearing diamondiferous eclogite from the Udachnaya kimberlite (Daldyn field, Siberian craton) has been studied to trace its complex evolution recorded in rock-forming and minor mineral constituents. The eclogite sample is composed of rock-forming omphacite (60 vol%), garnet (35 vol%) and quartz/coesite (5 vol%) and contains intergranular euhedral zoned olivine crystals, up to 200 mu m long, coexisting with phlogopite, orthopyroxene, clinopyroxene (secondary), K-feldspar, plagioclase, spinel, sodalite and djerfisherite. Garnet grains are zoned, with a relatively homogeneous core and a more magnesian overgrowth rim. The rim zones further differ from the core in having higher Zr/Y (6 times that in the cores), ascribed to interaction with, or precipitation from, a kimberlite-related melt. Judging by pressure-temperature estimates (similar to 1200 degrees C; 6.2 GPa), the xenolith originated at depths of similar to 180-200 km at the base of the continental lithosphere. The spatial coexistence of olivine, orthopyroxene and coesite/quartz with K-Na-Cl minerals in the xenolith indicates that eclogite reacted with a deep-seated kimberlite melt. However, Fe-rich olivine, orthopyroxene and low-pressure minerals (sodalite and djerfisherite) likely result from metasomatic reaction at shallower depths during transport of the eclogite by the erupting kimberlite melt. Our results demonstrate that a mixed eclogitic-peridotitic paragenesis, reported previously from inclusions in diamond, can form by interaction of eclogite and a kimberlite-related melt.
Ключевые слова:	GARNET LHERZOLITE; OLIVINE PHENOCRYSTS; UNALTERED KIMBERLITES; EAST KIMBERLITE; MINERAL INCLUSIONS; TRACE-ELEMENT; CRATONIC LITHOSPHERIC MANTLE; SIBERIAN CRATON; metasomatism; melting; Udachnaya pipe; kimberlite; lithospheric mantle; eclogite; CARBONATED PERIDOTITE XENOLITHS; ALKALI CHLORIDES;
Издано:	2020
Физ. характеристика:	383