Esseneite from Xenoliths in Dacite Lavas: Crystal Structure and Genesis

Esseneite from ultramafic xenoliths in dacite flow of the Ten’-01 paleovolcano at the Lena–Vilyui watershed, East Yakutia has been studied. The empirical formula of the mineral has been obtained using electron microprobe analysis: . Its crystal structure has been refined on the basis of the single c...

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Bibliographic Details
Published in:Geology of ore deposits 2019-12, Vol.61 (7), p.689-695
Main Authors: Yakubovich, O. V., Zayakina, N. V., Oleinikov, O. B., Kostin, A. V.
Format: Article
Language:English
Subjects:
Crystal structure
Earth and Environmental Science
Earth Sciences
Electron microprobe
Electron probe microanalysis
Electron probes
Empirical analysis
Iron
Mineral Crystallography
Mineral Resources
Minerals
Organic chemistry
Oxidation
Single crystals
Unit cell
Watersheds
X-ray diffraction
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Summary:Esseneite from ultramafic xenoliths in dacite flow of the Ten’-01 paleovolcano at the Lena–Vilyui watershed, East Yakutia has been studied. The empirical formula of the mineral has been obtained using electron microprobe analysis: . Its crystal structure has been refined on the basis of the single crystal X-ray diffraction data, ( R = 0.0152). The resulting crystal chemical formula is: . The monoclinic unit-cell parameters are: a = 9.7610(12), b = 9.8223(8), c = 5.3360(5) Å, β = 105.92(1), V = 441.89(8) Å 3 , Z = 4, space group C 2/ c. The distribution of atoms over positions in the crystal structures of the Ca–Fe–Al clinopyroxenes and coordination polyhedron distortions, which reflect the formation conditions of the minerals, have been analyzed. The Yakutia esseneite has been formed in a highly oxidizing environment at 1200–950°C and approximate pressure of 2 kbar.
ISSN:1075-7015
1555-6476
DOI:10.1134/S1075701519070158