Barium-bearing micas of the muscovite-ganterite series from alkaline rocks of the Sredneziminsky ijolite-syenite-carbonaite massif (Eastern Siberia, Russia)
- Авторлар: Savelyeva V.B.1, Danilov B.S.1, Bazarova Е.P.1, Khromova Е.А.2, Danilova Y.V.1
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Мекемелер:
- Institute of the Earth’s Crust Siberian Branch RAS
- Geological Institute N.L. Dobretsov Siberian Branch RAS
- Шығарылым: Том CLIII, № 1 (2024)
- Беттер: 119-138
- Бөлім: МИНЕРАЛЫ И ПАРАГЕНЕЗИСЫ МИНЕРАЛОВ
- URL: https://bakhtiniada.ru/0869-6055/article/view/261458
- DOI: https://doi.org/10.31857/S0869605524010077
- EDN: https://elibrary.ru/gsvagv
- ID: 261458
Дәйексөз келтіру
Аннотация
Barium-bearing micas (BaO content from 1.2 to 18.7 wt %) were found in hydrothermally altered ijolites and alkaline syenite of the Sredneziminsky ijolite-syenite-carbonatite massif (Eastern Siberia, Russia). It occurs in the products of low-temperature replacement of cancrinite, in association with natrolite, analcime, calcite, diaspore/boehmite, celsian, and strontianite. Ba-bearing micas are represented by grains up to 1 mm, heterogeneous in chemical composition. The amount of Ba increases in the marginal parts of grains; enrichment of some layers in mica grains with barium is also observed. The main isomorphic substitution in muscovite corresponds to the scheme K++Si4+↔Ba2++IVAl3+. The empirical formula of barium-richest areas in one of the mica grains is (Ba0.54–0.56Sr0–0.09K0.46)∑1.02–1.06Al1.98–2.01(Si2.37–2.40All.60–1.63)∑4.00 O10(OH1.70–2.00F0–0.30)∑2.00, which corresponds to ganterite. The maximum content of BaO in the majority of muscovite grains of the Sredneziminsky massif is 14.0–14.9 wt % that is equal to 0.41‒0.44 apfu Ba. It is assumed that the source of barium in the hydrothermal solution was orthoclase containing 0.5–0.9 wt % BaO which underwent albitization at the post-magmatic stage. The widespread occurrence of sulfides in the rocks indicates low oxygen fugacity, which prevents the formation of barite and is favorable to the formation of Ba-bearing muscovite and celsian.
Толық мәтін

Авторлар туралы
V. Savelyeva
Institute of the Earth’s Crust Siberian Branch RAS
Хат алмасуға жауапты Автор.
Email: vsavel@crust.irk.ru
д. член
Ресей, IrkutskB. Danilov
Institute of the Earth’s Crust Siberian Branch RAS
Email: boris@crust.irk.ru
д. член
Ресей, IrkutskЕ. Bazarova
Institute of the Earth’s Crust Siberian Branch RAS
Email: bazarova@crust.irk.ru
д. член
Ресей, IrkutskЕ. Khromova
Geological Institute N.L. Dobretsov Siberian Branch RAS
Email: lena.khromova.00@mail.ru
д. член
Ресей, Ulan-UdeY. Danilova
Institute of the Earth’s Crust Siberian Branch RAS
Email: jdan@crust.irk.ru
д. член
Ресей, IrkutskӘдебиет тізімі
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