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Brown diamonds from an eclogite xenolith from Udachnaya kimberlite, Yakutia, Russia
Citation
Stepanov, AS and Korsakov, AV and Yuryeva, OP and Nadolinniy, VA and Perraki, M and De Gussem, K and Vandenabeele, P, Brown diamonds from an eclogite xenolith from Udachnaya kimberlite, Yakutia, Russia, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 80, (1) pp. 41-48. ISSN 1386-1425 (2011) [Refereed Article]
Copyright Statement
Copyright 2011 Elsevier
DOI: doi:10.1016/j.saa.2011.01.006
Abstract
We have performed petrographic and spectroscopic studies of brown diamonds from an eclogite xenolith from the Udachnaya pipe (Yakutia, Russia). Brown diamonds are randomly intermixed with colorless ones in the rock and often located at the grain boundaries of clinopyroxene and garnet. Brown diamonds can be characterized by a set of defects (H4, N2D and a line at 490.7 nm) which are absent in colorless diamonds. This set of defects is typical for plastically deformed diamonds and indicates that diamonds were likely annealed for a relatively short period after deformation had occurred. Excitation of brown colored zones with a 632.8 nm He–Ne laser produced the typical diamond band plus two additional bands at 1730 cm−1 and 3350 cm−1. These spectral features are not genuine Raman bands, and can be attributed to photoluminescence at ∼710 nm (1.75 eV) and ∼802 nm (1.54 eV). No Raman peak corresponding to graphite was observed in regions of brown coloration. Comparison with previous reports of brown diamonds from eclogites showed our eclogitic sample to have a typical structure without signs of apparent deformation. Two mechanisms with regard to diamond deformation are proposed: deformation of eclogite by external forces followed by subsequent recrystallization of silicates or, alternatively, deformation by local stress arising due to decompression and expansion of silicates during ascent of the xenolith to surface conditions.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | Raman spectroscopy, infrared spectroscopy, brown diamonds, diamond deformation, eclogite xenolith |
| Research Division: | Earth Sciences |
| Research Group: | Geochemistry |
| Research Field: | Inorganic geochemistry |
| Objective Division: | Mineral Resources (Excl. Energy Resources) |
| Objective Group: | Mineral exploration |
| Objective Field: | Diamond exploration |
| UTAS Author: | Stepanov, AS (Mr Sasha Stepanov) |
| ID Code: | 95748 |
| Year Published: | 2011 |
| Web of Science® Times Cited: | 11 |
| Deposited By: | Centre for Ore Deposit Research - CODES CoE |
| Deposited On: | 2014-10-08 |
| Last Modified: | 2014-11-11 |
| Downloads: | 0 |
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