RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 8, ES3002, doi:10.2205/2006ES000196, 2006

2006ES000196-fig07.html
Figure 7. Scheme of the compositional evolution of accessory and ore Cr-spinels from high-Al to high-Cr and high-Fe types. The diagram displays the average compositions of Cr-spinel from certain rock complexes. 1 - Cr-picotite (Cpi) from lherzolites of the H complex of ultrabasites at the Kempirsai Massif; 2 - Cr-picotite (Cpi) from lherzolites of the H complex of ultrabasites at the Polar Urals; 3 - accessory and ore aluminochromite (Ach) from harzburgites of the H and DH ultrabasite complexes of the Urals; 4 - subferrialuminochromite (Sfach) from metamorphosed harzburgites and Cr ores; 5 - subferrichromite (Sfch) from metamorphosed dunites and Cr ores in the D and DH complexes of ultrabasite rocks in the Polar Urals; 6 - ore chromite from the Tsentralnoe deposit (ChT); 7 - ore chromite from the Almaz-Zhemchuzhina deposit, Kempirsai Massif, Kazakhstan (ChA); 8 - accessory chromite (Ch) from dunites of the D complex of ultrabasites of the Polar Urals; 9 - accessory subferrosubalumochromite (Fach) from metamorphosed (amphibolite facies) harzburgites of the DH ultrabasite complex of the Polar Urals; 10 - accessory and ore Cr-spinels and subaluminoferrichromite (Sfach) form metamorphosed (amphibolite facies) dunites and Cr ores in these dunites; 11 - accessory ferrochromite (Fch) from metamorphosed (high-grade prograde metamorphism) ultrabasites of the Polar Urals; 12 - chrome-magnetite (Cmt), high-Fe rims around highly metamorphosed accessory and ore Cr-spinel in ultrabasites of the Polar Urals; 13 - magnetite (Mt), an accessory ore mineral from voikarites, sagvandites, brucite-antigorite schists and other high-grade metamorphic (hornfels facies of contact metamorphism) ultrabasites of the Polar Urals.

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Citation: Makeyev, A. B. (2006), Typomorphic features of Cr-spinel and mineralogical prospecting guides for Cr ore mineralization, Russ. J. Earth Sci., 8, ES3002, doi:10.2205/2006ES000196.

Copyright 2006 by the Russian Journal of Earth Sciences
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