中文摘要：

在在西南的 Tianshan 的 UHP 变形的带的学习的最近的进步，中国，在这份报纸被总结。这被 coesite， coesite 假象和另外的 UHP 矿物质的发现关于 80-km-long 并且在 10-km-wide UHP 带上认出了。它是到目前为止报导的最大的海洋类型的 UHP 变形的带。它形成了由于向北方 Tianshan Paleo 海洋的 subduction。从忍受 coesite garnet-phengite 片岩锆石的变形边界标明日期的 U-Pb 产出一座山峰 320 獯桰牥捩洠湡汴 ? 敷杤? 挠浯潰敳 ? 景瀠牥摩瑯瑩 ? 椠 ? 景獦牣灡数 ? 牦浯椠獴戠瑯潴的 UHP 变形年龄吗？

英文摘要：

Recent progress in the study of the UHP metamorphic belt in southwestern Tianshan, China, is summarized in this paper. This about 80-kin-long and over 10-km-wide UHP belt has been recognized by the discovery of coesite, coesite pseudomorphs and other UHP minerals. It is the largest oceanic-type UHP metamorphic belt reported so far. It has formed due to northward subduc- tion of the Tianshan Paleo-Ocean. U-Pb dating of metamorphic rims of zircons from a coesite-bearing garnet-phengite schist yields a peak UHP metamorphic ages of 320±3.7 Ma. Combined with ages of 233-226 Ma obtained from rims of zircons from retrograded eclogites, a long retrograde metamorphic evolution （〉70 Ma） has been revealed. According to phase equilibria mod- eling, the P-T paths of both coesite-bearing eclogites and garnet-phengite schists are characterized by thermal relaxation, i.e., the metamorphic temperature peak lags behind the pressure peak, indicating that the UHP rocks experienced slow and long heating and decompression during exhumation in the subduction channel. On the basis of the field observation that a small amount of eclogite lenses is wrapped in large volumes of metapelites, and the similar P-T paths of both rock types, we propose that the ex- humation of the UHP eclogites from southwestern Tianshan, China, may have resulted from the exhumation of large volumes of low-density metapelites, which carried the denser eclogites to the Earth＇s surface.