Evolution of the composition of mantle micas in the presence of oceanic crust material
- Авторлар: Bendeliani A.A.1,2, Gornova E.S.1, Bobrov A.V.1, Eremin N.N.1,3
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Мекемелер:
- Lomonosov Moscow State University
- Vernadsky Institute of Geochemistry and Analytical Chemistry RAS
- Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry RAS
- Шығарылым: Том 526, № 1 (2026)
- Бөлім: MINERALOGY
- ##submission.dateSubmitted##: 01.08.2025
- ##submission.dateAccepted##: 15.09.2025
- ##submission.datePublished##: 16.10.2025
- URL: https://journals.rcsi.science/2686-7397/article/view/303645
- ID: 303645
Дәйексөз келтіру
Толық мәтін
Аннотация
Experiments aimed at the study of the crystallization conditions of high-pressure micas in ultramafic diamond-forming melts with variable proportions of crustal material were performed under the upper mantle conditions. Compositional variations of micas were studied in dependence on the proportions between peridotitic (ultramafic mantle) and basaltic (crustal) substrates. The crystallization of trioctahedral mica (phlogopite) proceeds in predominantly peridotitic substrate (up to 40 wt.% of the crustal component). With increasing portion of the crustal (basaltic) component in the starting system (not less than 50%), the VIAl/IVAl ratio and SiO2 content in the mineral increase, which may result in the formation of di-trioctahedral mica varieties. Significant decrease in the Mg/(Al+Ti) ratio in the mantle substance due to the introduction of the crustal material (not less than 80% of basalt) impedes the formation of trioctahedral phlogopite, which is replaced with Ti-bearing dioctahedral mica (aluminoceladonite). The competing relationships between admixtures of Ti4+ and Cr3+ in the composition of synthetic mica are suggested. Increase in the Ti/Cr ratio (up to 1 and higher) may indicate a high degree of involvement (> 40%) of the crustal material into mantle metasomatism.
Толық мәтін

Авторлар туралы
Aleksandra Bendeliani
Lomonosov Moscow State University;Vernadsky Institute of Geochemistry and Analytical Chemistry RAS
Хат алмасуға жауапты Автор.
Email: bendeliani@geokhi.ru
ORCID iD: 0000-0002-4727-5920
Scopus Author ID: 57210810839
ResearcherId: GVS-3112-2022
PhD in Mineralogy and Geology, scientific researcher at Department of Petrology and Volcanology, Geological Faculty, Lomonosov Moscow State University
Ресей, Russian Federation, Moscow, Leninskie Gory 1, GSP-1, Geological Faculty, Department of Petrology and Volcanology, 119991Elizaveta Gornova
Lomonosov Moscow State University
Email: sk0rlupka@yandex.ru
student at Department of Petrology and Volcanology, Geological Faculty, Lomonosov Moscow State University
Ресей, Russian Federation, Moscow, Leninskie Gory 1, GSP-1, Geological Faculty, Department of Petrology and Volcanology, 119991Andrey Bobrov
Lomonosov Moscow State University
Email: archi3@yandex.ru
professor, deputy dean in Faculty of Geology, Lomonosov Moscow State University
Ресей, Russian Federation, Moscow, Leninskie Gory 1, GSP-1, Geological Faculty, Department of Petrology and Volcanology, 119991Nikolai Eremin
Lomonosov Moscow State University;Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry RAS
Email: neremin@mail.ru
professor, acting dean of Faculty of Geology, Lomonosov Moscow State University
Ресей, Russian Federation, Moscow, Leninskie Gory 1, GSP-1, Geological Faculty, Department of Petrology and Volcanology, 119991Әдебиет тізімі
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