Abstract
Borehole CY-4 drilled in the southeastem part of the Troodos ophiolite sampled a sequence of diabasic, gabbroic, and mafic and ultramafic cumulate rocks. Thirteen representative samples were analyzed for major and trace elements. High Mg, Ni , and Cr contents and low contents of Fe, Ti, alkali, and incompatible elements are characteristic features of the cumulate rocks. The first group of elements is depleted in the upper part of the section and the later group is enriched. Olivine-rich ultramafic cumulates were derived from magma in equilibrium with mantle peridotite whereas the clinopyroxene-rich cumulates were derived from fractionated magma. Plagioclase-clinopyroxene (mafic) cumulates were probably formed from late, derivative magmas. The overall effect was a progressive lowering of Mg/Mg+Fe ratio during crystallization. The resulting magma is represented by the gabbroic and diabasic rocks. The diabases are characterized by their low K-tholeiitic affinity and MORB/lAT setting.
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