litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2023-23-4-491-499litosphere-1928Research ArticleСтатьиArticlesОсобенности проникновения Fe в матрицу из СаСО3 ± оливин ± серпентин при давлении 4 ГПа и температуре 1400-1500°С (экспериментальные данные)Peculiarities of Fe penetration into the matrix of CaCO3 ± olivine ± serpentine at a pressure of 4 GPa and temperature of 1400-1500°C (experimental data)СонинВ. М.SoninV. M.

630090, Новосибирск, пр-т Академика Коптюга, 3

Valery M. Sonin.

3 Academician Koptyug av., Novosibirsk 630090

sonin@igm.nsc.ruЖимулевЕ. И.ZhimulevE. I.

630090, Новосибирск, пр-т Академика Коптюга, 3

Egor I. Zhimulev.

3 Academician Koptyug av., Novosibirsk 630090

ЧепуровА. А.ChepurovA. A.

630090, Новосибирск, пр-т Академика Коптюга, 3

Alexey A. Chepurov.

3 Academician Koptyug av., Novosibirsk 630090

ТуркинА. И.TurkinA. I.

630090, Новосибирск, пр-т Академика Коптюга, 3

Aleksandr I. Turkin.

3 Academician Koptyug av., Novosibirsk 630090

ЧепуровА. И.ChepurovA. I.

630090, Новосибирск, пр-т Академика Коптюга, 3

Anatoly I. Chepurov.

3 Academician Koptyug av., Novosibirsk 630090

Институт геологии и минералогии СО РАНРоссияV.S. Sobolev Institute of Geology and Mineralogy, SB RASRussian Federation202308092023234491499Copyright © Сонин В.М., Жимулев Е.И., Чепуров А.А., Туркин А.И., Чепуров А.И., 20232023Сонин В.М., Жимулев Е.И., Чепуров А.А., Туркин А.И., Чепуров А.И.Sonin V.M., Zhimulev E.I., Chepurov A.A., Turkin A.I., Chepurov A.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/1928

Объект исследований. В представленном сообщении приводятся первые результаты по моделированию при высоких Р-Т параметрах взаимодействия СаСО3 с металлическим Fe в присутствии оливина и серпентина в сравнении с системой CaCO3-Fe. Это связано с необходимостью изучения реакций декарбонатизации при субдукции корового вещества в восстановленную мантию Земли в рамках проблематики глобального цикла углерода. Методы. Эксперимент проведен на аппарате высокого давления типа “разрезная сфера” (БАРС) при давлении 4.0 ГПа и температуре 1400-1500°С с последующем изучением полученных образцов на сканирующем электронном микроскопе, оборудованном системой химического микроанализа. Результаты. Установлено, что СаСО3 неустойчив в реализованных условиях. Продуктами реакций являются карбид железа и Са-вюстит или Са-магнезиовюстит в присутствии силикатных фаз. Выводы. Взаимодействие СаСО3 с металлическим Fe при высоком давлении имеет место, даже если компоненты находятся в твердом состоянии. Высокие скорости реакции при взаимодействии обеспечиваются появлением жидкого металла вследствие относительно низкой температуры плавления эвтектики в системе Fe-С. Установлено влияние силы тяжести на проникновение Fe в карбонатную матрицу, которое заключается в преимущественной инфильтрации жидкого металла между зернами карбоната. Присутствие Н2О значительно снижает температуру плавления карбоната, что приводит к увеличению диффузии компонентов и скорости реакции декарбонатизации, при этом влияние силы тяжести также имеет место вследствие разности удельного веса жидкого Fe в сравнении с другими компонентами в сильно флюидизированной среде.

Research subject. We present the first results on modeling of the interaction of CaCO3 with metallic Fe in the presence of olivine and serpentine at high P-T parameters in comparison with the CaCO3-Fe system. The relevance of the study is related to the need to study decarbonatization reactions during subduction of crustal matter into the Earth's reduced mantle within the context of the global carbon cycle. Methods. The experiment was carried out using a BARS high-pressure apparatus at a pressure of 4.0 GPa and temperatures of 1400-1500°С with a subsequent study of the obtained samples on a scanning electron microscope equipped with a chemical microanalysis system. Results. CaCO3 was found to be unstable under the implemented conditions. The reaction products were iron carbide and Ca-wustite or Ca-magnesiowustite in the presence of silicate phases. Conclusions. The interaction of CaCO3 with metallic Fe at high pressure occurs even if the components are in the solid state. High reaction rates during interaction are provided by the appearance of liquid metal due to the relatively low melting temperature of the eutectic in Fe-C systems. The influence of gravity on the penetration of Fe into the carbonate matrix, which consists in the predominant infiltration of liquid metal between carbonate grains, was established. The presence of H2O significantly reduces the melting point of carbonate, which leads to an increase in the diffusion of components and decarbonization reaction rate, while the effect of gravity also takes place due to the difference in the density of liquid Fe in comparison with other components in a highly fluidized environment.

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The authors declare that there are no conflicts of interest present.