Experimental study of the basalt-carbonate-[H.sub.2]O system at 4 GPa and 1100-1300°C: origin of carbonatitic and high-K silicate magmas

Experimental study of the basalt-carbonate-[H.sub.2]O system at 4 GPa and 1100-1300°C: origin of carbonatitic and high-K silicate magmas

Generation of K-silicate and carbonatite melts by melting of carbonated eclogite has been studied experimentally under hydrous and dry conditions at 4 GPa and 1100-300°C. At 1100°C, K-silicate melt appears first in equilibrium with Grt, Cpx, and Cb in the [H.sub.2]O-bearing system. At 1200-1250°C, t...

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Veröffentlicht in:Doklady earth sciences 2015-10, p.1018
Hauptverfasser: Gorbachev, N.S, Kostyuk, A.V, Shapovalov, Yu. B
Format: Artikel
Sprache:eng
Schlagworte:
Basalt
Carbonates
Earth
Magmatism
Mantle
Silicates
Subduction zones (Geology)
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Zusammenfassung:Generation of K-silicate and carbonatite melts by melting of carbonated eclogite has been studied experimentally under hydrous and dry conditions at 4 GPa and 1100-300°C. At 1100°C, K-silicate melt appears first in equilibrium with Grt, Cpx, and Cb in the [H.sub.2]O-bearing system. At 1200-1250°C, the K- silicate melt coexists with a carbonatite melt and Cpx ± Grt ± Cb assemblage. A complete miscibility between the K-silicate and carbonatite melts with formation of supercritical silicate-carbonate fluid melt is observed at 1300°C. DOI: 10.1134/S1028334X15100037
ISSN:1028-334X
DOI:10.1134/S1028334X15100037