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

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.

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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