Relics of deep alkali-carbonate melt from Komsomoskaya-Magnitnaya Kimberlite Pipe (Upper Muna Filed, Yakutia)

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Marco E. Ciriotti
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Relics of deep alkali-carbonate melt from Komsomoskaya-Magnitnaya Kimberlite Pipe (Upper Muna Filed, Yakutia)

Messaggio da Marco E. Ciriotti » mer 22 set, 2021 16:53

Referenza:
▪ Sharygin, I.S., Golovin, A.V., Dymshts, A.M., Kalugin, A.D., Soloveve, K.A., Malkovets, V.G., Pokhlilenko, N.P. (2021): Relics of deep alkali-carbonate melt from Komsomoskaya-Magnitnaya Kimberlite Pipe (Upper Muna Filed, Yakutia). Reports of the Russian Academy of Earth Sciences, 500, 161-167.

Abstract:
Crystallized secondary melt inclusions in sheared xenolith from the Komsomolskaya-Magnitnaya kimberlite pipe (Upper Muna field, Yakutia) have been investigated. Monticellite, phlogopite, tetraferriphlogopite KMg3(Fe3+)Si3O10(F,Cl,OH), apatite, aphthitalite K3Na(SO4)2, burkeite Na6CO3(SO4)2, and carbonates (calcite, nyerereite (Na,K)2Ca(CO3)2, shortite Na2Ca2(CO3)3 and eitelite Na2Mg(CO3)2) have been identified among daughter phases of the melt inclusions by confocal Raman spectroscopy method. The abundance of the alkali carbonates in the inclusions indicates an alkali-carbonate composition of the parental melt. Previously, identical inclusions of the alkali-carbonate melt in olivine of the sheared peridotite xenoliths from the Udachnaya kimberlite pipe (Daldyn field, Yakutia) were described. The melt inclusions in the sheared peridotites represent crystallized kimberlite melt penetrated peridotites either during the transport of the xenoliths to the surface or in the mantle in situ shortly before the entrainment of the xenoliths by the kimberlite magma. If the second scenario took place, then the alkali-carbonate melt inclusions in the sheared peridotites, carried from different depths, from the Udachnaya and the Komsomolskaya-Magnitnaya pipes indicate a large-scale metasomatic event in the lithospheric mantle of the Siberian Craton, caused by the alkali-carbonate melts. However, regardless of which of the two models proposed above are correct, the results support the alkali-carbonate composition of the primary kimberlite melts.
Marco E. Ciriotti

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