Multistage exhumation and partial melting of high-T ultrahigh-pressure metamorphic rocks in continental subduction-collision zones  

作　　者：LIU Yi Can DENG LiangPeng GU XiaoFeng 

机构地区：[1]CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences,University of Science and Technology of China

出　　处：《Science China Earth Sciences》2015年第7期1084-1099,共16页中国科学（地球科学英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2015CB856104);the National Natural Science Foundation of China(Grant No.41273036)

摘　　要：High-temperature(HT, >850℃) metamorphism in continental collision orogens, particularly for those ultrahigh-pressure(UHP) metamorphic rocks, has become one of the remarkable topics in Earth science. It has bearing on the element and isotope behaviors of UHP rocks, their partial melting and related geodynamic effects during exhumation. In this paper, five representative continental collision orogens with typical HT/UHP rocks, including the Dabie orogen in China, the Kokchetav in Kazakhstan, the Caledonides in Greenland, the Rhodope in Greece, and the Erzgebirge in Germany are introduced, and their HT/UHP metamorphism and evolution processes are summarized. In addition, metamorphic P-T-t paths, multistage exhumation processes, and partial melting and preservation and retrogression of UHP index minerals during exhumation and their possible mechanisms are discussed. On this basis, the forthcoming key fields and scientific subjects of HT/UHP rocks within continental subduction channel are proposed.High-temperature （HT, 〉850℃） metamorphism in continental collision orogens, particularly for those ultrahigh-pressure （UHP） metamorphic rocks, has become one of the remarkable topics in Earth science. It has bearing on the element and isotope behaviors of UHP rocks, their partial melting and related geodynamic effects during exhumation. In this paper, five representa- tive continental collision orogens with typical HT/UHP rocks, including the Dabie orogen in China, the Kokchetav in Kazakh- stan, the Caledonides in Greenland, the Rhodope in Greece, and the Erzgebirge in Germany are introduced, and their HT/UHP metamorphism and evolution processes are summarized. In addition, metamorphic P-T-t paths, multistage exhumation pro- cesses, and partial melting and preservation and retrogression of UHP index minerals during exhumation and their possible mechanisms are discussed. On this basis, the forthcoming key fields and scientific subjects of HT/UHP rocks within continen- tal subduction channel are proposed.

关 键 词：continental subduction-collision zone high-T ultrahigh-pressure rock P-T-t path multistage exhumation partial melting 

分 类 号：P542[天文地球—构造地质学]