Brown diamonds from an eclogite xenolith from Udachnaya kimberlite, Yakutia, Russia

Stepanov, AS; Korsakov, AV; Yuryeva, OP; Nadolinniy, VA; Perraki, M; De Gussem, K; Vandenabeele, P

dc.contributor.author	Stepanov, AS	en
dc.contributor.author	Korsakov, AV	en
dc.contributor.author	Yuryeva, OP	en
dc.contributor.author	Nadolinniy, VA	en
dc.contributor.author	Perraki, M	en
dc.contributor.author	De Gussem, K	en
dc.contributor.author	Vandenabeele, P	en
dc.date.accessioned	2014-03-01T02:47:17Z
dc.date.available	2014-03-01T02:47:17Z
dc.date.issued	2011	en
dc.identifier.issn	1386-1425	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/33059
dc.subject	Brown diamonds	en
dc.subject	Diamond deformation	en
dc.subject	Eclogite xenolith	en
dc.subject	Infrared spectroscopy	en
dc.subject	Raman spectroscopy	en
dc.subject.classification	Spectroscopy	en
dc.subject.other	Brown diamonds	en
dc.subject.other	Clinopyroxenes	en
dc.subject.other	Diamond band	en
dc.subject.other	Eclogites	en
dc.subject.other	External force	en
dc.subject.other	He-Ne lasers	en
dc.subject.other	Local stress	en
dc.subject.other	Raman bands	en
dc.subject.other	Raman peak	en
dc.subject.other	Short periods	en
dc.subject.other	Spectral feature	en
dc.subject.other	Spectroscopic studies	en
dc.subject.other	Surface conditions	en
dc.subject.other	Udachnaya pipe	en
dc.subject.other	Yakutia	en
dc.subject.other	Defects	en
dc.subject.other	Deformation	en
dc.subject.other	Grain boundaries	en
dc.subject.other	Infrared spectroscopy	en
dc.subject.other	Laser excitation	en
dc.subject.other	Metamorphic rocks	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Silicates	en
dc.subject.other	Spectroscopic analysis	en
dc.subject.other	Diamonds	en
dc.subject.other	diamond	en
dc.subject.other	color	en
dc.subject.other	conference paper	en
dc.subject.other	electron spin resonance	en
dc.subject.other	geology	en
dc.subject.other	methodology	en
dc.subject.other	Raman spectrometry	en
dc.subject.other	Russian Federation	en
dc.subject.other	Color	en
dc.subject.other	Diamond	en
dc.subject.other	Earth Sciences	en
dc.subject.other	Electron Spin Resonance Spectroscopy	en
dc.subject.other	Russia	en
dc.subject.other	Spectrum Analysis, Raman	en
dc.title	Brown diamonds from an eclogite xenolith from Udachnaya kimberlite, Yakutia, Russia	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1016/j.saa.2011.01.006	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.saa.2011.01.006	en
heal.language	English	en
heal.publicationDate	2011	en
heal.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 similar to 710 nm (1.75 eV) and similar to 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. (C) 2011 Elsevier B.V. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy	en
dc.identifier.doi	10.1016/j.saa.2011.01.006	en
dc.identifier.isi	ISI:000295297900009	en
dc.identifier.volume	80	en
dc.identifier.issue	1	en
dc.identifier.spage	41	en
dc.identifier.epage	48	en