Abstract
To characterize the influence of alkaline metal chlorides on the phase ratios under melting of upper mantle eclogites, the eclogite–CaCO3–NaCl–KCl system with Н2О + СО2-fluid was studied in the experiments under 4 GPa and 1200–1300°C. A low difference in temperatures (<100°C) was registered between the eclogite solidus and liquidus (>1200 and <1300°C, respectively), which is characteristic for the near-eutectic compositions. The phase proportions were peculiar for the absence of any silicate melt over the entire temperature range considered. The carbonate melt coexisted with clinopyroxene and garnet within 1200–1250°C, whereas a carbonate melt exclusively occurred under above-liquidus conditions at 1300°C. The melt quenching resulted in the formation of a multiphase fine-grained mixture of Ca, Na, and K carbonates and chlorides containing microinclusions of clinopyroxene and garnet. The occurrence of a high-calcium carbonate melt in Cl-containing eclogite systems might play a significant role in the mantle metasomatism of subduction zones characterized by the water–alkaline–chloride type of fluids.
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Original Russian Text © N.S. Gorbachev, Yu.B. Shapovalov, A.V. Kostyuk, 2018, published in Doklady Akademii Nauk, 2018, Vol. 479, No. 6, pp. 673–676.
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Gorbachev, N.S., Shapovalov, Y.B. & Kostyuk, A.V. The Influence of Sodium and Potassium Chlorides on Phase Ratios in the Eclogite–CaCO3–H2O + CO2 System at 4 GPa and 1200–1300°C. Dokl. Earth Sc. 479, 524–528 (2018). https://doi.org/10.1134/S1028334X18040232
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DOI: https://doi.org/10.1134/S1028334X18040232