Abstract—
The paper summarizes authors' earlier and newly obtained experimental data on the formation of phlogopite and chromium-bearing potassium titanates of the crichtonite, magnetoplumbite, and hollandite groups, which are indicator minerals that characterize various stages of modal metasomatism in the upper mantle. Phlogopite-forming reactions were studied in the garnet–orthopyroxene system in the presence of H2O–KCl fluid at 3 and 5 GPa and 900–1000°C as simulating phlogopite formation in garnet peridotites and pyroxenites. Experiments have demonstrated regular variations in Ca and Cr contents in the garnet and Al in the pyroxenes, as well as the composition of the newly formed phlogopite, depending on the concentration of the potassium component (KCl or K2CO3) of the fluid. Experiments on the formation of potassium titanates (yimengite, mathiasite, and priderite) in the chromite–rutile/ilmenite–K2CO3–H2O–CO2 system at 3.5 and 5 GPa and 1200°C have proved that these minerals can be formed when chromite reacts with potassic aqueous–carbonic fluid, but these reactions require additional sources of titanium. These sources may be rutile and/or ilmenite, which are usually also produced by modal metasomatism of peridotites. The experiments thus confirm that the formation of titanates marks the most advanced stages of metasomatism in mantle peridotites. The experiments have shown that the formation of potassium titanates follows the formation of phlogopite, whereas assemblages of the titanates with phlogopite are produced at higher concentrations of the potassium component of the fluid than phlogopite alone. The relationships between the titanates are also a function of the activity of the potassium component in the fluid and, probably, pressure. The relationships and trends reproduced in the experiments clearly illustrate features of mineral assemblages and variations in compositions of minerals from metasomatized peridotites in the lithospheric mantle.
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This study was carried out under government-financed research projects AAAA-A18-118020590140-7 and AAAA-A18-118020590148-3 for the Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences.
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Translated by E. Kurdyukov
Mineral symbols: Ap—apatite, Cal—calcite, Chr—chromite, Cpx—clinopyroxene, Di—diopside, Dol—dolomite, En—enstatite, Fo—forsterite, Grs—grossular, Grt—garnet, HAWYIM—minerals of the hawthorneite–yimengite series, Ilm—ilmenite, Knr—knorringite, KRich—potassic richterite, Ky—kyanite, LIMA—minerals of the lindsleyite–mathiasite series, Ma—mathiasite, Ol—olivine, Opx—orthopyroxene, Phl—phlogopite, Pri—priderite, Prp—pyrope, Rt—rutile, Spl—spinel, Srp—serpentine, Uv—uvarovite, Yim—yimengite, Zrn—zircon.
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Butvina, V.G., Safonov, O.G., Vorobey, S.S. et al. Experimental Study of Reactions Forming Phlogopite and Potassic Titanates as Mineral Indicators of Metasomatism in the Upper Mantle. Geochem. Int. 59, 757–777 (2021). https://doi.org/10.1134/S0016702921080024
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DOI: https://doi.org/10.1134/S0016702921080024