Immiscibility between Fe- and Si-Rich Silicate Melts in Mesoproterozoic Ferrobasalt of the Ladoga Graben, Karelia, Russia

Evidence for liquid immiscibility between Fe-rich and Si-rich silicate melts in ferrobasalt of the Ladoga Graben in the Baltic Shield belonging to the Mesoproterozoic anorthosite–rapakivi granite (AMCG-type) association is reported. The liquid immiscibility microtextures are represented by emulsion...

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Bibliographic Details
Published in:Doklady earth sciences 2022-08, Vol.505 (2), p.517-523
Main Authors: Nosova, A. A., Lebedeva, N. M., Sazonova, L. V., Voznyak, A. A.
Format: Article
Language:English
Subjects:
Anorthosite
Baltic Shield (Europe)
Corona
Cratons
Crystallization
Earth and Environmental Science
Earth Sciences
Emulsions
Geochemistry
Glass
Globules
Graben
Immiscibility
Iron
Iron oxides
Melts
Miscibility
Silica
Silicates
Silicon dioxide
Sulfides
Sulphides
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Summary:Evidence for liquid immiscibility between Fe-rich and Si-rich silicate melts in ferrobasalt of the Ladoga Graben in the Baltic Shield belonging to the Mesoproterozoic anorthosite–rapakivi granite (AMCG-type) association is reported. The liquid immiscibility microtextures are represented by emulsion of tiny globules (1–2 μm) or individual larger globules (10–20 μm) of finely crystallized iron-rich silicate glass embedded in interstitial Si-rich glass. Large globules show the core–shell and core–shell–corona microtextures indicating the immiscibility of the sulfide melt in them. The globules have a high FeO content (31.9 ± 1.6 wt %) and a low SiO 2 content (39.5 ± 4.2 wt %). The felsic glass hosting globules contains 61.4 ± 7.1 wt % SiO 2 and 8.1 ± 1.5 wt % FeO. The immiscibility could occur at temperatures below 1100°C.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X2208013X