Open AccessCoesite inclusion in diamondferous kyanite-bearing eclogite from kimberlite pipe Udachnaya (Siberian Craton)
Author(s) -
D. S. Mikhailenko,
D. S. Mikhailenko,
Andrey V. Korsakov,
Andrey V. Korsakov,
Olga V. Rezvukhina,
Olga V. Rezvukhina,
Alexander V. Golovin,
A. V. Golovin,
N. V. Sobolev,
N. V. Sobolev
Publication year - 2019
Publication title -
doklady akademii nauk. rossijskaâ akademiâ nauk
Language(s) - English
Resource type - Journals
ISSN - 0869-5652
DOI - 10.31857/s0869-56524874428-431
Subject(s) - kimberlite , coesite , eclogite , kyanite , geology , geochemistry , diamond , xenolith , peridotite , pyrope , petrology , metamorphism , mantle (geology) , metallurgy , subduction , materials science , tectonics , seismology
A find of coesite in a kyanite graphite-diamond-bearing eclogite xenolith from the Udachnaya-Vostochnaya kimberlite pipe is described in this paper. The coesite relics were found in intensely fractured garnet indicating some influence of the kimberlite melt, which is supported by the typical secondary mineral assemblage around this inclusion. These data indicate that shallower diamond-free coesite rocks (2,7 GPa) underwent metamorphism distinct from diamond-bearing coesite eclogites (~4 GPa). The metasomatic alteration of rock interacting with C-O-H fluid during diamond crystallization may be another possible reason for the missing coesite in diamond-bearing xenoliths.