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Influence of C–O–H–Cl-Fluids on Melting Phase Relations of the System Peridotite-Basalt: Experiments at 4.0 GPa

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Abstract

The article presents the results of experiments at pressure 4.0 GPa and temperature 1400 °C on the influence of fluids (H2O, H2O + CO2, H2O + HCl) on the composition of restite and magma formed during the melting of the peridotite-basalt-(K, Na)2CO3 system as a model analogue of the mantle reservoir contaminated with protoliths of subducted oceanic crust. The composition of the fluid has a significant impact on the phase relations. In “dry” conditions and with H2O fluid alkaline melts of phonolite type are formed, at H2O + CO2 fluid composition—trachiandezybasalts, with H2O + HCl fluid—riodacite melts. The alkaline melts coexist with an olivine-free restite pyroxene-phlogopite composition. Critical relations between fluid and silicate melt are observed in the water-bearing system. Interaction of supercritical fluid melts with peridotite restite leads to the formation of clinopyroxene, K-amphibole, phlogopite, carbonate, quenching silicate globules. Newly formed clinopyroxene and K-amphibole are in reactionary relations with olivine, orthopyroxene and clinopyroxene of peridotite restite. The revealed effects testify to instability of olivine at melting of peridotite-basalt mixture in the presence of fluid, effective influence of fluid composition on phase composition and critical ratios.

Keywords

Experiment Mantle Crust Fluid Melt Interaction Melting Critical relations 

Notes

Acknowledgement. The study was funded by the projects of RFBR №17-05-00930a and IEM RAS №AAAA18-118020590140

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Copyright information

© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.D.S. Korzhinskii Institute of Experimental MineralogyRussian Academy of ScienceChernogolovka, Moscow RegionRussia

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