Podiform Chromite Ore Bodies: a Genetic Model

This paper presents an attempt to interpret the formation ofpodiform chromite ore found in ophiolitic complexes from magmaticaccumulation inside cavities along the basalt conduits feedingthe main magma chamber. Two processes play a major role in chromite concentration: anactive upward magma flow in narrow dykes; and an active convectioninside the cavity, for which a numerical modelling has beenperformed. The physical conditions imposed by the model compare well withgeophysical and geological data.