DIAMONDS FROM THE POPIGAI IMPACT STRUCTURE, RUSSIA

dc.contributor.author	Koeberl C.
dc.contributor.author	Schrauder M.
dc.contributor.author	Masaitis V.L.
dc.contributor.author	Shafranovsky G.I.
dc.contributor.author	Gilmour I.
dc.contributor.author	Langenhorst F.
dc.date.accessioned	2020-12-23T08:29:04Z
dc.date.available	2020-12-23T08:29:04Z
dc.date.issued	1997
dc.identifier	https://elibrary.ru/item.asp?id=13256029
dc.identifier.citation	Geology, 1997, , 11, 967-970
dc.identifier.issn	0091-7613
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/21141
dc.description.abstract	Diamonds were found in impact melt rocks and breccias at the Popigai impact structure in Siberia. The diamonds preserve the crystallographic habit and twinning of graphites in the preimpact target rocks, from which they formed by shock transformation. Secondary and transmission electron microscopy indicate that the samples are polycrystalline and contain abundant very thin lamellae, which could represent stacking faults, with local hexagonal symmetry, or microtwins. Microcrystalline units are ≤1 μm. Infrared spectroscopy indicates the presence of solid CO2 and water in microinclusions in the diamonds, CO2 being under a pressure greater than 5 GPa (at room temperature). Trace element and isotopic compositions confirm the derivation from graphite precursors.
dc.title	DIAMONDS FROM THE POPIGAI IMPACT STRUCTURE, RUSSIA
dc.type	Статья

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