PARENTAL MELTS OF THE INTRUSIVE CUMULATES OF THE TROODOS MASSIF, CYPRUS - A STUDY OF CLINOPYROXENES AND MELT INCLUSIONS IN PLAGIOCLASE

The geochemistry of clinopyroxene from the cumulates of various intrus ive suites and melt inclusions in planioclase from the olivine gabbros of the early intrusive suite of the Troodos ophiolite massif (Cyprus) was studied. It was found that the concentrations of incompatible ele ments in the glasses of melt inclusions in plagioclase are similar to those calculated on the basis of the incompatible element contents of clinopyroxene and the partition coefficients of these elements between clinopyroxene and melt obtained at low temperature and pressure. The melt inclusions in plagioclases are correspond to water-rich andesites , which could be formed by crystal fractionation of island-are tholeii tic magmas parental for the lower and upper pillow lavas of the Troodo s massif. The intrusive suites studied are not related to the boniniti c volcanic series of the Troodos upper pillow lavas. With respect to i ncompatible element chemistry, the clinopyroxenes of the intrusive sui tes are comparable to the clinopyroxenes depleted in light REE, titani um, and zirconium that occur in the cumulates of mid-ocean ridges.