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- Title
The Influence of Sodium and Potassium Chlorides on Phase Ratios in the Eclogite-CaCO<sub>3</sub>-H<sub>2</sub>O + CO<sub>2</sub> System at 4 GPa and 1200-1300°C.
- Authors
Gorbachev, N. S.; Shapovalov, Yu. B.; Kostyuk, A. V.
- 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.
- Subjects
EFFECT of salt on concrete; POTASSIUM chloride; ECLOGITE; METAMORPHIC rocks; ALKALI metal chlorides
- Publication
Doklady Earth Sciences, 2018, Vol 479, Issue 2, p524
- ISSN
1028-334X
- Publication type
Article
- DOI
10.1134/S1028334X18040232