Tatyana Shumilova - Academia.edu (original) (raw)

Papers by Tatyana Shumilova

Vestnik Voronežskogo gosudarstvennogo universiteta. Geologiâ, Oct 3, 2023

Аннотация Bведение: Особенностью Карской астроблемы является специфический состав пород мишени, п... more Аннотация Bведение: Особенностью Карской астроблемы является специфический состав пород мишени, представленных углеродсодержащими сланцами и алевролитами, первично обогащенными полезными компонентами. В крупных астроблемах происходит интенсивная гидротермальная переработка вмещающих пород, которая может стимулировать мобилизацию, переотложение и концентрирование рудного вещества. В связи с этим для установления возможного постимпактного гидротермального воздействия на породы мишени, в том числе с участием вещества астероида, нами проведен анализ геохимического состава углеродсодержащих пород окружения Карской астроблемы с применением многомерной статистики. Методика: Проведен анализ вещественного состава углеродсодержащих пород окружения Карской астроблемы методами многомерной статистики-корреляционным, факторным и иерархическим кластерным методами. Результаты и обсуждение: В углеродсодержащих породах окружения Карской астроблемы методами математической статистики установлена сильная корреляционная связь между элементами Cu, Zn, Sr, Y, HREE и U, которая указывает на генетическую связь рудных и редкоземельных минералов. Ni, Co, Zn и Cr находятся в сильной корреляционной связи между собой и концентрируются в рудных минералах. Элементы Mo, Tl и V имеют генетическую связь с аквагенным органическим веществом. Данные факторного анализа свидетельствуют о привносе редких компонентов (Cs, Rb, Th, Nb, Ta, Sn, Be, Sc и Pb) в связи с постимпактной гидротермальной деятельностью. Установлено, что в зоне развития зювитов углеродсодержащие породы характеризуются более высокими содержаниями Ni и Co по отношению к породам исходного субстрата на удалении от борта астроблемы. Заключение: В результате выявлена геохимическая специфика компонентов, в целом свидетельствующая о привносе некоторых рудных и редкоземельных элементов в породы мишени Карской астроблемы в результате постимпактной гидротермальной деятельности, мобилизации, переотложения и концентрирования вещества. Анализ содержаний Ni, Co и Cr указывает на частичное обогащение космическим веществом пород мишени ближайшего окружения кратера, находящихся в области интенсивного ударного дробления, дезинтегрирования и гидротермальной минерализации.

ACS Applied Materials & Interfaces

IOP Conference Series: Earth and Environmental Science, 2021

The Kara Astrobleme is a unique geological object located in the northwestern part of the Arctic ... more The Kara Astrobleme is a unique geological object located in the northwestern part of the Arctic zone of Russia. Impactites from the Kara crater are diamondiferous to various degrees. At present the Kara suevites are relatively poorly studied. Until now the petrographic features of the matrix have been described in general terms, and petrochemically the cementing mass of the suevites has not yet been studied. In 2015 suevite breccias of the southern part of the Kara Astrobleme were subdivided into three different types. It was later suggested that the suevites of the western part of the impact crater, located at the Put’yu and Sayakha rivers, could be type II suevites, but at the same time they had a number of distinctive features which might be associated with different formation conditions of these rocks. Hence it is relevant to study the matrix of the suevites of the mentioned areas to clarify their facies and formation features. The paper presents results of a comprehensive stud...

![Research paper thumbnail of UHPHT Glasses in Bottom Suevite Facies (Ust`-Kara, Arctic Ocean, Russia)](https://a.academia-assets.com/images/blank-paper.jpg)

IOP Conference Series: Earth and Environmental Science, 2020

Amorphous substances, including glasses, are very important kind of value materials for numerous ... more Amorphous substances, including glasses, are very important kind of value materials for numerous applications. Among the glasses the impact matter has especially high fundamental interest and use potential, being formed under extremely high PT conditions - up to hundreds GPa and thousands degrees Celsius. In this direction the detail studies of new natural occurrences with UHPHT impact glasses and their features are very actual fundamentally and probably potentially useful for new ideas for technologies. Our analytical studies of the UHPHT ribbonlike impact glasses of the Ust`-Kara area at the Baydarata Bay (Kara Sea, Arctic Ocean) revealed the presence a number of special features such as multilevel differentiation of impact melt and coesite abundance. The specifics of the Ust`-Kara UHPHT glasses rather point to bottom facies of the suevitic breccia. The observed impactites characteristics allow to see new geological importance of the studied Ust`-Kara suevites, allow to correct ge...

IOP Conference Series: Earth and Environmental Science, 2019

The behavior of the disordered systems in the conditions of the strong compression attracts parti... more The behavior of the disordered systems in the conditions of the strong compression attracts particular interest in materials science. Natural impact glasses, being with a metastable state, can keep features of the structure for millions of years, form essential volumes compare to experimentally possible high-pressure products. The complex analysis of geological, mineralogical-petrographic, petrochemical features and degree of crystallinity of tagamites, vein glasses and vitro-clastic formations of the origin type of melt impactites of the Kara astrobleme including their phase state composition have been studied. The melt Kara impactites have dependence on the initial character of the melted sedimentary target and cooling velocity of an impact melt. The lowest order has been described for ultrahigh pressure vein-type glasses which contain silica drops with single crystalline coesite and firstly found melt-crystallized high pressure variety of smectite. The vein melt impactites consist of solidified impact melt presented by totally amorphous alumina silicate glass with augite microcrystallites and ultrahigh pressure silica glass with coesite microcrystals and "drops" of firstly found melt-crystallized high pressure variety of smectite. The boundary between alumina silicate and silica glass is characterized with liquated amorphous Fe-rich drops. The special feature of the studies melt impactites is low alteration in spite of 70 Ma age and high content of water. The large volumes of an impact melt created massive tagamite bodies have longer cooling underwent with the almost complete crystallization. The obtained data indicate the specific nature of melt glasses of vein type and prospects of their further research for fundamental study of amorphous state under ultrahigh pressure and propose new materials.

Russian Journal of Pacific Geology

European Journal of Mineralogy

Phase composition and nanostructure of layered and irregular massive impact diamond grains from t... more Phase composition and nanostructure of layered and irregular massive impact diamond grains from the Popigai astroblem have been investigated by Raman spectroscopy and high resolution electron microscopy and the conditions of phase transformations are discussed. Several coexisting carbon phases forming tight aggregates have been found including cubic and hexagonal diamond polymorphs, graphite, amorphous carbon, fullerene-like/onion-like carbon. The latter is described within impact diamonds for the first time. It is proposed that the formation of onion-like carbon, in both layered and massive impact diamond grains, is connected with high pressure graphite transformation or post-pressure stress cooling which causes the partial back transformation of diamond nanocrystallites to sp2 carbon. However, possible relict origin of the fullerene-like carbon from the impacted initial sedimentary rocks with fullerenes and fullerene-like substances, like shungite or coal, can not be excluded. The...

Mineralogy and Petrology, 2011

Natural carbon nanofibers have been found in diamond-bearing carbonatites from the Chagatay trach... more Natural carbon nanofibers have been found in diamond-bearing carbonatites from the Chagatay trachytecarbonatite complex (Uzbekistan) and described using a series of methods, including SEM, TEM, and Raman spectroscopy. The carbon nanofibers occur as tight aggregates within the host graphite, forming natural bulk nano-structural intergrowths. This is the first description of such carbon nanofibers either in nature or in the laboratory. The data from this study suggest a new possible means of diamond formation. These carbon intergrowths could potentially be used as a model for the fabrication of new types of carbon nanostructural material.

European Journal of Mineralogy, 2010

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Doklady Earth Sciences, 2006

ABSTRACT The problem of endogenic carbonification of rocks and related ore mineralization is topi... more ABSTRACT The problem of endogenic carbonification of rocks and related ore mineralization is topical for many reasons. The possibility of accumulation and transfer of various metals with reduced carbon-rich fluids has been proved [1‐4]. However, several questions concerning the mode of transfer and forms of deposition of elements in carbonized rocks remain open. In the deep fault zones of the southern framework of the Siberian Craton, the degree of structural perfection of native forms of carbon and forms of metal concentration in graphite closely interrelate and depend on PT conditions of tectonite formation. We have studied two areas with carbonic mineralization. The first area is located in the southeastern segment of the Main Sayan (MS) Fault. Graphite occurs here as veins, lenses, and pockets in the pegmatitic granite and cataclastic diopside plagiogneiss. The graphite disseminations in amphibole and amphibole‐ clinopyroxene‐plagioclase metasomatites and silicification zones are combined with compact fine-grained graphite aggregates in intergranular interstices and fractures. The fine-grained graphite occurs as segregations in blastomylonite and mylonite zones.

Doklady Earth Sciences, 2009

Nowadays several different types of primary diamond deposits are known, including kimberlite and ... more Nowadays several different types of primary diamond deposits are known, including kimberlite and lamproite deposits that are their main industrial sources. Several diamond occurrences are also known in regionally metamorphosed and impact metamorphosed rocks, basalts, picrites, and carbonatites. Some researchers consider visherites also as a primary source of diamonds [1‐6]. We describe the first occurrence of diamonds in connection with

Doklady Earth Sciences, 2007

Doklady Earth Sciences, 2011