Composition of micas from rocks and melt inclusions in quartz of Li-F granites of the Orlovka massif in Eastern Transbaikalia as a genetic indicator
- 作者: Badanina E.V.1, Syritso L.F.1, Volkova E.V.1, Thomas R.1
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隶属关系:
- Saint-Petersburg State University
- 期: 卷 CLIII, 编号 3 (2024)
- 页面: 3-28
- 栏目: Articles
- URL: https://bakhtiniada.ru/0869-6055/article/view/272677
- DOI: https://doi.org/10.31857/S0869605524030019
- EDN: https://elibrary.ru/PMBZLL
- ID: 272677
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详细
Based on the study of the chemical composition of rock-forming micas and micas from melt inclusions in quartz of a full range of differentiates of the Li-F granite Orlovka massif in Eastern Transbaikalia, possible mechanisms of formation of the massif are considered. An early stage with a mica evolution trend in rocks (biotite — Li-rich aluminous annite — Li-rich phengite-muscovite), manifested in the synchronous accumulation of Li and F in the melt, mica from the rock and melt inclusions (an ongonite trend of the melt evolution), culminated in the formation of specific porphyroblast microcline-albite granites with Li-rich phengite-muscovite and snow-ball quartz. It was this melt that served as the basis for all its subsequent transformations (repeated manifestation of silicate-salt liquid immiscibility, post-magmatic metasomatism), which determined the development of the “apogranite process”. The crystallization of exclusively lithium-free high-alumininous muscovite in the melt inclusions of microcline-albite granites and the subsequent series of amazonite-bearing rocks with a high content of Li and F in the homogenized glass of these inclusions allows us to assume the crystallization of this mineral from the depleted melt, coexisting with the isolated Li-F hydrosalt phase. The obtained results indicate the convergence of the mechanism of formation of Li-Fe micas, which allows the probability of their crystallization from a fluid-saturated melt and as a result of metasomatic reworking at the different stages of formation of the Orlovka massif.
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作者简介
E. Badanina
Saint-Petersburg State University
编辑信件的主要联系方式.
Email: e.badanina@spbu.ru
俄罗斯联邦, Saint-Petersburg
L. Syritso
Saint-Petersburg State University
Email: e.badanina@spbu.ru
俄罗斯联邦, Saint-Petersburg
E. Volkova
Saint-Petersburg State University
Email: e.badanina@spbu.ru
俄罗斯联邦, Saint-Petersburg
R. Thomas
Email: e.badanina@spbu.ru
德国
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