NITROGEN AGGREGATION IN METAMORPHIC DIAMONDS FROM KAZAKHSTAN

dc.contributor.author	Finnie K.S.
dc.contributor.author	Fisher D.
dc.contributor.author	Griffin W.L.
dc.contributor.author	Harris J.W.
dc.contributor.author	Sobolev N.V.
dc.date.accessioned	2020-12-03T08:48:37Z
dc.date.available	2020-12-03T08:48:37Z
dc.date.issued	1994
dc.identifier	https://elibrary.ru/item.asp?id=31133251
dc.identifier.citation	Geochimica et Cosmochimica Acta, 1994, , 23, 5173-5177
dc.identifier.issn	0016-7037
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/20346
dc.description.abstract	Microdiamonds that occur in high-grade metamorphic rocks of the Kokchetav massif in Kazakhstan have been interpreted as part of the metamorphic mineral assemblage, implying previously unrecorded pressures for the metamorphism of crustal rocks. Analysis of the infrared and visible absorption spectra from Kokchetav microdiamonds (extracted from recent stream sediments draining the metamorphic rocks) shows roughly 48–63% aggregation of single N substitution to A centres, but no measurable further aggregation. Calculated residence times, assuming peak metamorphic temperatures of 800–900°C, are from <0.5 Ma to 40 Ma and support the petrographic evidence that these diamonds formed during the high-pressure metamorphism, rather than being inherited from premetamorphic sediments.
dc.title	NITROGEN AGGREGATION IN METAMORPHIC DIAMONDS FROM KAZAKHSTAN
dc.type	Статья

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