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Extremely Al-Depleted Chlorites From Dolomite Carbonatites of the Kovdor Ultramafic-Alkaline Complex, Kola Peninsula, Russia

Published online by Cambridge University Press:  01 January 2024

Nikita V. Chukanov ,
Maria G. Krzhizhanovskaya ,
Igor V. Pekov ,
Dmitry A. Varlamov ,
Konstantin V. Van ,
Vera N. Ermolaeva  and
Svetlana A. Vozchikova
Nikita V. Chukanov*
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow, Region 142432, Russia
Maria G. Krzhizhanovskaya
Affiliation:
Department of Crystallography, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 St. Petersburg, Russia
Igor V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow 119234, Russia
Dmitry A. Varlamov
Affiliation:
Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow, Region 142432, Russia
Konstantin V. Van
Affiliation:
Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow, Region 142432, Russia
Vera N. Ermolaeva
Affiliation:
Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow, Region 142432, Russia
Svetlana A. Vozchikova
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow, Region 142432, Russia
*
*E-mail address of corresponding author: chukanov@icp.ac.ru
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Abstract

The problem to be solved is whether Al is a necessary component of Fe-Mg chlorites. Very unusual Al-depleted and Fe-enriched trioctahedral chlorites with the empirical formulae Na0.05Ca0.05(Fe2+3.01Mg2.01Ti0.14Fe3+0.04)Σ6.00[(Si3.53Fe3+0.41Al0.06)Σ4.00O10](OH)8·nH2O (Sample 1) and Na0.05Ca0.01(Fe2+3.26Mg1.97Fe3+0.75Mn0.01Ti0.01)Σ6.00[(Si3.16Fe3+0.75Al0.09)Σ4.00O10](OH)8 (Sample 2) have been discovered in Al-depleted dolomite carbonatites of the Kovdor complex of ultramafic, alkaline rocks and carbonatites, Kola Peninsula, Russia. The presence of substantial amounts of Ti in Sample 1 is another unusual feature of this mineral. In both samples, chlorites are intimately intergrown with cronstedtite-1T which is an indication of a low stability of chlorite structure in the absence of aluminum in the tetrahedral sheet. The crystal structure of chlorite in Sample 1 was solved by the Rietveld method. The mineral is triclinic (IIb-4-module), space group C-1, a = 5.4153(4), b = 9.3805(7), c = 14.5743(12) Å, α = 90.137(5)°, β = 96.928(5)°, γ = 90.043(6)°, V = 734.95(10) Å3, and Z = 2. A problem to be solved is how stable are Al-free chlorites belonging to the clinochlore–chamosite solid-solution series and whether their existence in natural mineral assemblages is possible. The results obtained indicate that even though Al-depleted chlorites belonging to the clinochlore–chamosite solid-solution series exist in Nature as metastable phases, these minerals are extremely rare and much less stable than Al-poor serpentines.

Keywords

ChloriteCronstedtiteCrystal structureDolomite carbonatiteInfrared spectroscopyKovdor ComplexRietveld refinement
Type
Article
Information
Clays and Clay Minerals , Volume 68 , Issue 1 , February 2020 , pp. 81 - 88
Copyright
Copyright © Clay Minerals Society 2020

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