Morphology and Genesis of Ballas and Ballas-Like Diamonds | Sciact - CRIS-система Института катализа

Morphology and Genesis of Ballas and Ballas-Like Diamonds Научная публикация

Журнал

Crystals
, E-ISSN: 2073-4352

Вых. Данные

Год: 2021, Том: 11, Номер: 1, Номер статьи : 17, Страниц : 23 DOI: 10.3390/cryst11010017

Ключевые слова

ballas diamond; ballas-like diamond; twinning; morphology; polycrystalline of diamonds; crystals splitting

Авторы

Pavlushin Anton ^1,2 , Zedgenizov Dmitry ^1,3 , Vasilev Evgeny ⁴ , Kuper Konstatntin ⁵

Организации

1	Department of Geology and Geophysics, Novosibirsk State University, 630090 Novosibirsk, Russia
2	Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences, 677000 Yakutsk, Russia
3	V. S. Sobolev Institute of Geology and Mineralogy, Siberian Branch Russian Academy of Sciences, 630090 Novosibirsk, Russia
4	Saint-Petersburg Mining University, 199106 Saint-Petersburg, Russia
5	Budker Institute of Nuclear Physics, Siberian Branch Russian Academy of Sciences, 630090 Novosibirsk, Russia

Ballas diamond is a rare form of the polycrystalline radial aggregate of diamonds with diverse internal structures. The morphological features of ballas diamonds have experienced repeated revision. The need that this paper presents for development of a crystal-genetic classification was determined by a rich variety of combined and transitional forms of ballas-like diamonds, which include aggregates, crystals, and intergrowths. The new crystal-genetic classification combines already-known and new morphological types of ballas as well as ballas-like diamonds discovered in the placers of Yakutia, the Urals, and Brazil. The ballas-like diamond forms include spherocrystals, aggregates with a single crystal core, split crystals, radial multiple twin intergrowths, and globular crystals. The crystal genetic scheme of the evolution of ballas and ballas-like diamonds is a sequence of the morphological types arranged in accordance with the conventional model of the dependence of the mechanism and diamond growth from carbon supersaturation developed by I. Sunagawa. The evolution of the growth forms of ballas and ballas-like diamonds was tracked based on the macrozonal structure of diamonds varying from a flat-faced octahedron to a fibrous cuboid with its transition forms to the radiating crystal aggregates. The morphological diversity of the ballas-like diamonds depends on the level of supersaturation, and abrupt changes of the level of supersaturation engender abrupt changes in a mechanism of crystal growth. The change in the rate of growth under the influence of adsorption and absorption of the mechanic impurities accompanied the sudden appearance of the autodeformation defects in the form of splitting and multiple radial twinning of crystals. The spherical shape of Yakutia ballas-like diamonds is due to the volumetric dissolution that results in the curved-face crystals of the “Urals” or “Brazilian” type associated with ballas diamonds in placers.

Pavlushin A. , Zedgenizov D. , Vasilev E. , Kuper K.
Morphology and Genesis of Ballas and Ballas-Like Diamonds

Crystals. 2021. V.11. N1. 17 :1-23. DOI: 10.3390/cryst11010017 WOS Scopus CAPlus OpenAlex

Полный текст от издателя

Поступила в редакцию:	22 нояб. 2020 г.
Принята к публикации:	24 дек. 2020 г.
Опубликована в печати:	27 дек. 2021 г.
Опубликована online:	27 дек. 2021 г.

Web of science:	WOS:000610133100001
Scopus:	2-s2.0-85098780816
Chemical Abstracts:	2021:1013689
OpenAlex:	W3117456379

БД	Цитирований
Web of science	6
Scopus	7
OpenAlex	6