ADVANCES STUDY OF CHINA'S ULTRAHIGH-PRESSURE METAMORPHIC ROCKS IN THE PAST 15 YEARS

来源 :Scientia Geologica Sinica | 被引量 : 0次 | 上传用户:lrg123
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Studies of ultra-high pressure metamorphic (UHP) rocks from China started in the 1980s. Progresses made so far are summarized as follows. (1) The Dabieshan-Sulu UHP belt became well-known in the world because that many new outcrops of UHP rocks were discovered. (2) Mineralogical evidence indicates that the continental crust rocks with low density could subduct down to depths of >200 km and experience UHP metamorphism. (3) UHP rocks from the Dabieshan-Sulu belt were dated as early Mesozoic when the Yangtze Craton subducted northward beneath the Sino-Korean Craton. (4) Fluids were not active, and oxygen isotope composition of meteoric water could be preserved during UHP metamorphism, as is evidenced by O-, C-, and H- isotope data. (5) A multistage model is suggested to explain the exhumation of the UHP terrain. Some hotly debated issues are summarized. Studies of ultra-high pressure metamorphic (UHP) rocks from China started in the 1980s. Progresses made so far are summarized as follows. (1) The Dabieshan-Sulu UHP belt became well-known in the world because that many new outcrops of UHP (2) Mineralogical evidence indicates that the continental crust rocks with low density could subduct down to depths of> 200 km and experience UHP metamorphism. (3) UHP rocks from the Dabieshan-Sulu belt were dated as early Mesozoic when the Fluids were not active, and oxygen isotope composition of meteoric water could be preserved during UHP metamorphism, as is evidenced by O-, C-, and H-isotope data. (4) 5) A multistage model is suggested to explain the exhumation of the UHP terrain. Some hotly debated issues are summarized.
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