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Formation of K–Cr Titanates from Reactions of Chromite and Ilmenite/Rutile with Potassic Aqueous-Carbonic Fluid: Experiment at 5 GPa and Applications to the Mantle Metasomatism

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Abstract

Magnetoplumbite (yimengite-hawthorneite, HAWYIM), crichtonite (lindsleyite-mathiasite, LIMA) and hollandite (priderite) minerals are exotic titanate phases, which formed during metasomatism at the conditions of high alkali activity, especially K, in the fluids in the upper mantle peridotites. The paper presents data on experiments on formation of K-end-members priderite, yimengite and mathiasite, as the result of the interaction of chromite, chromite + rutile and chromite + ilmenite assemblages in the presence of a small amount of silicate material with H2O–CO2–K2CO3 fluids at 5 GPa and 1200 °C. Cr-bearing Ba-free priderite, characteristic for metasomatized Cr-rich harzburgites, was firstly synthesized. The experiments demonstrated the principal possibility of the formation of the titanates in the reactions of chromite with alkaline aqueous-carbonic fluids and melts. However, the formation of these phases does not proceed directly on chromite, but requires additional titanium source. The relationship between titanates is found to be a function of the activity of the potassium component in the fluid/melt. Priderite is an indicator of the highest potassium activity in the mineral-forming medium. Titanates in the run products are constantly associated with phlogopite. Experiments prove that the formation of titanates manifests the most advanced or repeated stages of metasomatism in mantle peridotites. Association of titanates with phlogopite characterizes a higher activity of the potassium component in the fluid/melt than the formation of phlogopite alone. The examples from natural associations, reviewed in the paper, well illustrate these conclusions.

Keywords

K-Cr titanates Yimengite Priderite Mathiasite Potassic fluid Peridotite Mantle metasomatism High pressure experiment 

Notes

The work was financially supported by the governmental projects AAAAA18-118020590148-3 and AAAA-A18-118020590140-7 of the Korzhinskii Institute of Experimental Mineralogy.

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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 SciencesChernogolovka, Moscow RegionRussia
  2. 2.Geological DepartmentLomonosov Moscow State UniversityMoscowRussia

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