Incompatible element partitioning between clinopyroxene and basalt liquid revealed by the study of melt inclusions in minerals from Troodos lavas, Cyprus

Melt inclusions in clinopyroxene from Troodos lavas were studied by the methods of high-temperature optical thermometry, secondary ion mass spectrometry, and microprobe analysis to determine the partition coefficients of Ba, Sr, Y, Ti, La, Ce, Nd, Sm, Dy, Er, and Yb between low-Al, high-Mg clinopyroxene and boninite-like melt for temperatures of 1100-1190 degrees C and a hydrous fluid pressure of 1 kbar. Variations of the partition coefficients were found as a function of the temperature and the Al2O3 content in clinopyroxene. The results proved the study of melt inclusions in minerals to be an efficient tool for determining the coefficients of trace element distribution between the crystalline phase and the liquid.