Composition of Chromites in Cordierite- and Mica-Bearing Cr-Ni Ores from Málaga Province, Spain

I. S. Oen, C. Kieft and A. B. Westerhof
Geologisch Instituut der Universiteit van Amsterdam
Netherlands Organisation for the Advancement of Pure Research (ZWO)
Geologisch Instituut der Universiteit van Amsterdam

Summary: An unusual paragenesis of chromite, nickeline, cordierite, and red-brown mica occurs in veins, pods, and schlieren in serpentinized ultramafic rocks at La Gallega and Los Jarales in Máilaga province, Spain. The chromites in this paragenesis are low-ferric, ferrous-rich aluminous chromites with exceptionally high vanadium content ranging between 1·8 and 2·9 wt % V2O3 and high zinc content ranging between 0·5 and 1·0 wt % ZnO. A comparison of chromite composition with available experimental data, together with paragenetical and textural evidence, suggests that the chromite, cordierite, and red-brown mica crystallized at magmatic temperatures between approximately 1300° and 1000°C at low oxygen fugacities and maximum pressures below 10 kb, probably near 5 kb.

Mineralogical Magazine; June 1973 v. 39; no. 302; p. 193-203; DOI: 10.1180/minmag.1973.039.302.07
© 1973, The Mineralogical Society
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