Abstract
Podiform chromite deposits are lenticular, chromite-rich autoliths in deformed dunites and harzburgites of ophiolite complexes. The ophiolite association is assumed to be created along accreting plate boundaries in the oceanic lithosphere. It is suggested that podiform chromite deposits form as magmatic cumulates in elongate magma pockets along the accreting plate boundaries. Chemical variations exhibited by chromites in podiform deposits (high Cr and/or Al contents, great Cr:Al variation, low Ti concentrations, limited Fe:Mg variation) are caused by fractional crystallization of primitive magmas buffered by residual, mafic silicates. Nodular textures, which characterize podiform chromite deposits, may result from snowballing of chromite crystals in a turbulent zone of magma segregation. After formation, the chromite cumulates sink as podiform autoliths into the under-lying, residual harzburgites and dunites.
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