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Название: Thermal metamorphism of metal assemblage in the light lithology of the Chelyabinsk LL5 meteorite
Авторы: Brusnitsyna, E. V.
Muftakhetdinova, R. F.
Yakovlev, G. A.
Grokhovsky, V. I.
Дата публикации: 2024
Издатель: AN Zavaritsky Institute of Geology and Geochemistry
Библиографическое описание: Брусницына, Е. В., Муфтахетдинова, Р. Ф., Яковлев, Г. А., & Гроховский, В. И. (2024). ТЕРМИЧЕСКИЙ МЕТАМОРФИЗМ МЕТАЛЛИЧЕСКОЙ АССОЦИАЦИИ В СВЕТЛОЙ ЛИТОЛОГИИ МЕТЕОРИТА ЧЕЛЯБИНСК LL5. Литосфера, 24(2), 341-346. https://doi.org/10.24930/1681-9004-2024-24-2-341-346
Аннотация: Research subject. Metal assemblage in the light lithology of the Chelyabinsk ordinary chondrite (LL5). Aim. The study of the structure of kamacite (α-Fe(Ni, Co)) and taenite (γ-Fe(Ni, Co)), as well as identification of the morphological features resulting from heating of chondrite matter. Materials and methods. Samples from the unaltered light lithology of the Chelyabinsk meteorite. The chemical composition of the samples was studied using optical microscopy (Zeiss Axiovert 40 MAT) and scanning electron microscopy (FE-SEM ∑IGMA VP) with an EDS unit. Results. The studied fragments can be divided into three groups depending on their structural composition: 1) metal grains with an unchanged structure; a zonal structure is observed in taenite (tetrataenite, cloudy zone); 2) metal grains with a taenite structure similar to the zo nal one; 3) fragments in which no grains with a zonal structure were found; martensite-like structures formed during rehea-ting were present. The structure of metal assemblage in the Chelyabinsk chondrite is compared with the structure of metal assemblage obtained in previous experiments with the Seymchan iron meteorite. It was established that heating to a temperature of 400°C for 6 h causes no changes in the metal grain structure. Heating to tempe ratures of 500 and 600°C for 6 h initiates transformation processes of the cloudy zone, which disappears completely after heated to 700°C for 6 h. Conclusions. Fragments of the light lithology of the Chelyabinsk ordinary chondrite were heating unevenly as a result of an impact event in its cosmic history. The presence of tetrataenite and a cloudy zone in one of the fragments means that temperature in this area didn’t exceed 400°C. Some areas underwent heating in the temperature range of 500–600°C and above 700°C. © 2024, AN Zavaritsky Institute of Geology and Geochemistry. All rights reserved.
Ключевые слова: CHELYABINSK METEORITE
CHONDRITE
CLOUDY ZONE
KAMACITE
PLESSITE
TAENITE
TETRATAENITE
URI: http://elar.urfu.ru/handle/10995/141633
Условия доступа: info:eu-repo/semantics/openAccess
cc-by
Идентификатор РИНЦ: 65679843
Идентификатор SCOPUS: 85193717236
Идентификатор PURE: 57319918
ISSN: 2500-302X
1681-9004
DOI: 10.24930/1681-9004-2024-24-2-341-346
Сведения о поддержке: Ministry of Education and Science of the Russian Federation, Minobrnauka, (FEUZ-2023-0014); Ministry of Education and Science of the Russian Federation, Minobrnauka
The research was funded by the Ministry of Science and Higher Education of the Russian Federation (Ural Federal University Program of Development within the Priority-2030 Program). E.V. Brusnitsyna thanks the Ministry of Science and Higher Education of the Russian Federation for project support No. FEUZ-2023-0014
Карточка проекта РНФ: Ministry of Education and Science of the Russian Federation, Minobrnauka, (FEUZ-2023-0014); Ministry of Education and Science of the Russian Federation, Minobrnauka
The research was funded by the Ministry of Science and Higher Education of the Russian Federation (Ural Federal University Program of Development within the Priority-2030 Program). E.V. Brusnitsyna thanks the Ministry of Science and Higher Education of the Russian Federation for project support No. FEUZ-2023-0014
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