Инд. авторы:	Afanasiev V., Gromilov S., Sonin V., Zhimulev E., Chepurov A.
Заглавие:	Graphite in rocks of the Popigai impact crater: residual or retrograde?
Библ. ссылка:	Afanasiev V., Gromilov S., Sonin V., Zhimulev E., Chepurov A. Graphite in rocks of the Popigai impact crater: residual or retrograde? // TURKISH JOURNAL OF EARTH SCIENCES. - 2019. - Vol.28. - Iss. 3. - P.470-477. - ISSN 1300-0985.
Внешние системы:	DOI: 10.3906/yer-1808-6; РИНЦ: 41634820; SCOPUS: 2-s2.0-85068482504; WoS: 000467745800008;
Реферат:	eng: The concentration of diamond-bearing tagamite from the Popigai impact crater produces large amounts of graphite in addition to impact diamonds (1:100, respectively). The question arises of whether this is residual graphite not converted to diamond at the time of the Popigai impact or is a retrograde form resulting from back-conversion of impact diamond to graphite in a high-temperature tagamite melt. Experiments show that graphite from tagamite is a residual phase. Coexistence of lonsdaleite, cubic diamond, and single-crystal graphite within a limited volume may be due to different orientations of the graphite base plane relative to the impact stress direction. Thus, the diamond-bearing rocks may contain significant amounts of residual graphite, which is consistent with published evidence.
Ключевые слова:	GRAPHITIZATION; DIAMOND; surface graphitization; PROGRAM; graphite; impact diamond; Impact crater; bulk graphitization; TRANSFORMATION;
Издано:	2019
Физ. характеристика:	с.470-477