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The nature of the elongated form of diamond crystals from urals placers. / Vasiliev, Evgeny; Klepikov, Igor V.; Kozlov, Alexander V.; Antonov, Anton V.
в: Journal of Mining Institute, Том 239, 2019, стр. 492-496.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - The nature of the elongated form of diamond crystals from urals placers
AU - Vasiliev, Evgeny
AU - Klepikov, Igor V.
AU - Kozlov, Alexander V.
AU - Antonov, Anton V.
N1 - Publisher Copyright: © 2019, Saint-Petersburg Mining University. All rights reserved.
PY - 2019
Y1 - 2019
N2 - The article presents the results of a study of the internal structure of highly elongated diamond crystals from placers in the Krasnovishersky district of the Urals. Very elongated crystals are found within diamond-bearing placer with unrevealed primary sources. Determining the conditions of such crystals formation can help one to determine the primary deposits type. There are three hypotheses for the formation of the elongated shape of such crystals: 1) crystals initially elongated along the <100> (strongly distorted octahedra); 2) individual crystals of columnar aggregates; 3) elongated crystals fragments. To study the internal structure, we selected three most elongated individuals of the 155 crystals samples. The study of the internal structure of selected crystals with the usage of photoluminescent (PL) tomography, cathodoluminescence (CL), and optical microscopy has shown that these samples are fragments of larger single crystals. CL imaging allowed to determine slip lines within the crystal's volume. The recorded PL spectra show the 912, 946, and 986 nm peaks, which are characteristic of crystals with plastic deformation. The revealed features are indicators of plastic deformation accompanying the destruction of the crystals. The significant dissolution following the destruction of the crystals led to the rounding of the vertices and edges of their fragments. Apparently, most of the very elongated crystals from placers with unknown sources are also highly dissolved isometric crystal fragments. The obtained results have shown that the deformation and dissolution of diamond crystals are related events characteristic of diamonds from hitherto undetected, but highly productive primary deposits.
AB - The article presents the results of a study of the internal structure of highly elongated diamond crystals from placers in the Krasnovishersky district of the Urals. Very elongated crystals are found within diamond-bearing placer with unrevealed primary sources. Determining the conditions of such crystals formation can help one to determine the primary deposits type. There are three hypotheses for the formation of the elongated shape of such crystals: 1) crystals initially elongated along the <100> (strongly distorted octahedra); 2) individual crystals of columnar aggregates; 3) elongated crystals fragments. To study the internal structure, we selected three most elongated individuals of the 155 crystals samples. The study of the internal structure of selected crystals with the usage of photoluminescent (PL) tomography, cathodoluminescence (CL), and optical microscopy has shown that these samples are fragments of larger single crystals. CL imaging allowed to determine slip lines within the crystal's volume. The recorded PL spectra show the 912, 946, and 986 nm peaks, which are characteristic of crystals with plastic deformation. The revealed features are indicators of plastic deformation accompanying the destruction of the crystals. The significant dissolution following the destruction of the crystals led to the rounding of the vertices and edges of their fragments. Apparently, most of the very elongated crystals from placers with unknown sources are also highly dissolved isometric crystal fragments. The obtained results have shown that the deformation and dissolution of diamond crystals are related events characteristic of diamonds from hitherto undetected, but highly productive primary deposits.
KW - Cathodoluminescence
KW - Crystal deformation
KW - Diamond
KW - Photoluminescence
KW - Placers
KW - Ural
UR - http://www.scopus.com/inward/record.url?scp=85074861642&partnerID=8YFLogxK
U2 - 10.31897/PMI.2019.5.492
DO - 10.31897/PMI.2019.5.492
M3 - Article
AN - SCOPUS:85074861642
VL - 239
SP - 492
EP - 496
JO - Journal of Mining Institute
JF - Journal of Mining Institute
SN - 2411-3336
ER -
ID: 86254052