Abstract
Axial concentrations of the first formed minerals, caused by an inward motion of crystals during flow (Bagnold effect), occur in the sheeted dykes of the Guevgueli ophiolitic complex (Greek Macedonia). The resulting chemical differentiation within individual dykes mimics that seen in random samples of the dyke complex as a whole and of the overlying lavas: the differentiation of these formations is due primarily to redistribution of crystals during flow.
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