Abstract

Chromites have been analysed from Vavdos and Gomati, two mafic—ultramafic complexes in the Chalkidiki peninsula, Greece. The complexes, interpreted as ophiolites generated in small ocean basins or marginal seas, have been tectonically incorporated, forming allochthonous bodies bounded by thrust faults. Chromite analyses reveal that the ores are high-Cr, metallurgical type at Vavdos but high-Al, refractory type at Gomati. The origin of the ores, and of accessory chromite in the ultramafic rocks, is related to extraction of basaltic melt during progressive partial melting of the upper mantle and subsequent fractional crystallisation. Podiform chromites are an early product of the crystallisation of such a basaltic melt; they are intimately associated with a dunite host-rock.

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