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The most productive chromite ore deposits are formed through crystallization of chromite-oremagmas under definite physico-chemical conditions.The formation of chromite ore is control-led mainly by the degree of differentiation of ultrabasic magma.How to measure the degree ofultrabasic magmatic differentiation is key to understanding the mechanism of formation of chro-mite ore.Many geologists base their understanding of ultrabasic magmatic differentiation on whe-ther there are obvious petrographical-facies zones in ultrabasic rocks.This viewpoint needs fur-ther discussing because most ultrabasic rock bodies showing petrographical zonation contain nomineral deposits.On the contrary mineral deposits may occur in the ultrabasic rocks withoutobvious petrographical zonation.Therefore,the author suggests to use the chemical characteris-tics of minerals to determine the degree of ultrabasic magmatic differentiation as a guide to se-arch for chromite ore deposits.
The most productive chromite ore deposits are formed through crystallization of chromite-oremagmas under definite physico-chemical conditions. The formation of chromite ore is control-led mainly by the degree of differentiation of ultrabasic magma. How to measure the degree ofultrabasic magmatic differentiation is key to understanding the mechanism of formation of chro-mite ore. Many geologists base their understanding of ultrabasic magmatic differentiation on whe-ther there are obvious petrographical-facies zones in ultrabasic rocks.This perspective needs fur-ther discussing for most ultrabasic rock bodies showing petrographical zonation contain nomineral deposits. On the contrary mineral deposits may occur in the ultrabasic rocks withoutobvious petrographical zonation.Therefore, the author suggests to use the chemical characteris-tics of minerals to determine the degree of ultrabasic magmatic differentiation as a guide to se-arch for chromite ore deposits.