Cover Story：A rutile- and omphacite-bearing kyanite (Ky)-quartz (Qtz) vein in the ultrahigh-pressure (UHP) eclogite of the Sulu orogenic belt, eastern China. It crystallized from the silicate-rich supercritical fluid derived from the deeply subducted continental crust. Studies demonstrated that the supercritical fluid-rock interaction under the extreme UHP metamorphic condition can result in the mobility of chemically immobile elements and the high-degree fractionation between Nb and Ta, and that large amounts of UHP eclogites subducted into the deep mantle serve as high Nb/Ta ratio reservoirs in the earth. The research achievement directed by Professor ZHANG Ze-ming, Institute of Geology, Chinese Academy of Geological Sciences, ranks first among the “Top Ten Scientific and Techno-logical Progresses of Chinese Academy of Geological Sciences in 2008”. For details, see pp.5-20. (Photo by ZHANG Ze-ming)