Study of mineral exsolution on the Songduo eclogites in Tibet
西藏松多榴辉岩矿物出溶体研究

A lot exsolution structures have been observed in the Songduo eclogites, southern Tibet. EDS analyzing in the EPMA shows that the exsolutions in garnet are rutile, and the exsolutions in omphacite are a K-rich mineral and quartz. The calculation of the garnet-omphacite-phengite geobarothermometer shows that the peak-metamorphic P-T conditions of the Songduo eclogites are close to the transformation line between quartz-coesite. Thus, the exsolutions of minerals indicate that the Songduo eclogites likely experienced UHP metamorphism, which provides an important evidence for formation P-T conditions of the Songduo eclogites.