Olivine in a Coesite-bearing Eclogite from the Udachnaya Kimberlite Pipe

Olivine (high-Fe forsterite; Fo# 69-76) and associated minerals have been studied in a coesite-bearing diamondiferous eclogite from the Udachnaya-East kimberlite pipe. Olivine was identified in the rock interstices together with K-feldspar, sodalite, phlogopite, and djerfisherite. The composition of...

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Bibliographic Details
Published inDoklady earth sciences Vol. 489; no. 1; pp. 1358 - 1362
Main Authors Mikhailenko, D. S., Rezvukhin, D. I., Korsakov, A. V., Sobolev, N. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.11.2019
Springer Nature B.V
Subjects
Aluminum oxide
Bearing
Biotite
Chlorine
Coesite
Coexistence
Diamonds
Earth and Environmental Science
Earth Sciences
Eclogite
Feldspars
Forsterite
Geochemistry
Interstices
Iron
Magma
Minerals
Olivine
Phosphorus pentoxide
Pipes
Sodalite
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Summary:Olivine (high-Fe forsterite; Fo# 69-76) and associated minerals have been studied in a coesite-bearing diamondiferous eclogite from the Udachnaya-East kimberlite pipe. Olivine was identified in the rock interstices together with K-feldspar, sodalite, phlogopite, and djerfisherite. The composition of individual olivine grains varies within the xenolith and is characterized by a consistent presence of P 2 O 5 , MnO, CaO, and Al 2 O 3 . The coexistence of olivine and coesite is uncommon for mantle xenoliths. The occurrence of olivine and K, Na, and Сl-bearing minerals in the studied sample is suggested to have been caused by the interaction of the eclogite with a protokimberlite melt enriched in alkali components and chlorine.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X19110242