Immiscibility between Fe- and Si-Rich Silicate Melts in Mesoproterozoic Ferrobasalt of the Ladoga Graben, Karelia, Russia.
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| Title: | Immiscibility between Fe- and Si-Rich Silicate Melts in Mesoproterozoic Ferrobasalt of the Ladoga Graben, Karelia, Russia. |
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| Authors: | Nosova, A. A.1 (AUTHOR) nosova@igem.ru, Lebedeva, N. M.1 (AUTHOR), Sazonova, L. V.1,2 (AUTHOR), Voznyak, A. A.1 (AUTHOR) |
| Source: | Doklady Earth Sciences. Aug2022, Vol. 505 Issue 2, p517-523. 7p. |
| Subjects: | Immiscibility, Silicates, Melting, Granite, Glass |
| Geographic Terms: | Karelia (Russia) |
| Abstract: | 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 SiO2 content (39.5 ± 4.2 wt %). The felsic glass hosting globules contains 61.4 ± 7.1 wt % SiO2 and 8.1 ± 1.5 wt % FeO. The immiscibility could occur at temperatures below 1100°C. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | 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 SiO2 content (39.5 ± 4.2 wt %). The felsic glass hosting globules contains 61.4 ± 7.1 wt % SiO2 and 8.1 ± 1.5 wt % FeO. The immiscibility could occur at temperatures below 1100°C. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 1028334X |
| DOI: | 10.1134/S1028334X2208013X |
