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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Published in | Doklady earth sciences Vol. 489; no. 1; pp. 1358 - 1362 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Moscow
Pleiades Publishing
01.11.2019
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 1028-334X 1531-8354 |
DOI: | 10.1134/S1028334X19110242 |