Vasily Ulyashev

Vasily Ulyashev
Komi Scientific Center · Institute of Geology

PhD

About

20
Publications
2,573
Reads
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49
Citations
Citations since 2016
20 Research Items
49 Citations
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2016201720182019202020212022024681012
2016201720182019202020212022024681012
Introduction
Vasily Ulyashev currently works at the Institute of Geology, Komi Scientific Center. Vasily does research in Optics, Materials Science and Cosmology. Their most recent publication is 'Diamond paramorph after organics 2018'.

Publications

Publications (20)
Article
Full-text available
Natural graphite, a polygenic mineral, is a product of regional, contact, impact metamorphism, and magmatic or fluid deposition. In fluid-deposited graphite, aqueous C-O-H systems play a special role in determining the characteristics of hydrothermal products by shifting the chemical equilibrium. From this viewpoint, the recently discovered carboni...
Article
Full-text available
The results of experimental modeling of impact transformation of weakly ordered carbon substance by short-pulse laser radiation on glassy carbon are presented. The experiments yielded extremely high temperatures of ~14500 K and pressures of ~300 GPa, which are comparable ЭКСПЕРИМЕНТАЛЬНАЯ МИНЕРАЛОГИЯ 90 МИНЕРАЛОГИЯ 6(3) 2020 with temperatures and p...
Article
Full-text available
The results of experimental modeling of impact transformation of weakly ordered carbon substance by short-pulse laser radiation on glassy carbon are presented. The experiments yielded extremely high temperatures of ~14500 K and pressures of ~300 GPa, which are comparable with temperatures and pressure of the formation of large Earth’s meteorite cra...
Article
Full-text available
Impact diamonds are technical material with valuable mechanical properties. Despite of a quite long story from their discovery and huge diamond storages at the Popigai astrobleme (Siberia, Russia) they were not involved into industrial production, first of all because of remoteness of objects, complexity of extraction and economically more favourab...
Conference Paper
Full-text available
It is widely known that impact dia-monds can be formed by the solid-phase diffusion-less mechanism from graphite transition to diamond under shock pressure > 30 GPa. Much less known impact diamond variety formed after coal substance was found in the 70-s by V.A.Yezerskiy at the unique Kara astrobleme (Pay-Khoy, Russia). After more than 30 years sin...
Article
Full-text available
Impact diamond is one of perspective natural type of superhard carbon materials, forming huge resources sometimes, such as Popigai impact structure counting the largest diamond storage on the Earth. By present, there are two known types of impact diamonds – after-graphitic and after-coal varieties formed from different carbon precursors. Here we pr...
Article
The study of the metamorphosed carbonaceous matter (MCM) of the Kara astrobleme (PayKhoy, Russia) by the methods of small-angle scattering of X-ray synchrotron radiation (SAXS) and high resolution transmission electron microscopy (HRTEM) is described. The nanostructured features of the impactmetamorphosed and primary carbonaceous matter of sediment...
Article
Unusual carbonaceous matter, termed here chiemite, composed of more than 90% C from the Alpine Foreland at Lake Chiemsee in Bavaria, southeastern Germany has been investigated using optical and atomic force microscopy, X‐ray fluorescence spectroscopy, scanning and transmission electron microscopy, high‐resolution Raman spectroscopy, X‐ray diffracti...
Article
Unusual carbonaceous matter, termed here chiemite, composed of more than 90% C from the Alpine Foreland at Lake Chiemsee in Bavaria, southeastern Germany has been investigated using optical and atomic force microscopy, X‐ray fluorescence spectroscopy, scanning and transmission electron microscopy, high‐resolution Raman spectroscopy, X‐ray diffracti...
Article
Full-text available
The study of the metamorphosed carbonaceous matter (MCM) of the Kara astrobleme (Pay-Khoy, Russia) by the methods of small-angle scattering of X-ray synchrotron radiation (SAXS) and high resolution transmission electron microscopy (HRTEM) is described. The nanostructured features of the impactmetamorphosed and primary carbonaceous matter of sedimen...
Article
Full-text available
Impact diamonds are traditionally considered as paramorphs after graphite, those have been confirmed by numerous experiments. In the 1970s and 1980s, a list of after-coal impact carbon phases in shock-metamorphosed rocks of the Kara astrobleme had been discovered. In this paper we present for the first time the results of the study of carbon phases...
Conference Paper
Full-text available
Here we present the after-coal diamonds features including a new impact diamond variety presented by after-organics diamond paramorphs first time found by us at the Kara astrobleme (Pay-Khoy, Russia). The paramorphs are characterized with perfectly preserved micromorphology of the wood relics being composed of pure carbon content with polynanocryst...
Data
A new variety of impact diamonds has been found at the Kara astrobleme (Pay-Khoy, Russia) – diamond paramorphs after organics. It is characterized by nicely preserved organic morphology and has other specific features. The details are in the paper Shumilova et al. After-coal diamonds: an enigmatic type of impact diamonds. EJM, 2018. DOI: 10.1127/e...
Article
Impact diamonds were discovered in the 70s and are usually accepted as being paramorphs after graphite, resulting in grains of extremely high mechanical quality. A diffusion-less mechanism for the graphite-to-diamond transition under huge pressure has been experimentally realized and theoretically explained. Besides, another type of impact product...
Article
Full-text available
Transformation of carbonate matter of a target during impact process remains poorly studied. Phase changes in silicate sedimentary rocks with a high proportion of carbonate matter, as well as limestones with clay and carbonaceous components, are largely unexplored. For the first time an experimental work to simulate an impact process with a short-p...
Article
Full-text available
The results of study of phosphate-bearing carbonaceous quartzites of the Polar Urals are presented. The rocks underwent low-temperature regional and deformation metamorphism. The carbonaceous matter is graphite. The rocks show an increased content of V, Cs, Te and heavy rare earth elements (Gd, Dy, Er). Rare-metal minerals, sulfides, rare-earth car...
Article
The nanoporosity and structure of natural carbons has been investigated on the example of Karelian carbon-rich shungites by comparing the data of small-angle synchrotron radiation scattering and highresolution microscopy. The analysis of small-angle scattering data is based on the model of scattering spheres with lognormal size distribution. It is...

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