Abstract
Summary Compositions of the hydrous melts in equilibrium with garnet, omphacitic clinopyroxene and quartz have been investigated experimentally at 28.5 and 35 kbar. They are represented by silica-rich liquids (> 70% SiO2) with low MgO, FeO and CaO contents. The removal of ca 10-15% of the magma of this composition may be sufficient to convert quartz eclogite formed after subduction of altered MORB into a quartz-free bimineralic eclogite assemblage, which is a common type of xenoliths in kimberlites. At 28.5 kbar the solidus temperature is between 700 and 750 °C in the system quartz eclogite--water, and the high pressure amphibole-out boundary lies at ca 25 kbar in accord with the previous studies.
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