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Magmatism during continental collision, subduction, exhumation and mountain collapse in collisional orogenic belts and continental net growth: A perspective

查看全文 作　　者：SONG [1]ShuGuang;WANG [1]MengJue;WANG [1]Cao;NIU [2,3]YaoLing 高影响力作者 机构地区：[1]MOE Key Laboratory of Orogenic Belt and Crustal Evolution, School of Earth and Space Sciences,Peking University;[2]Department of Earth Sciences, Durham University;[3]Institute of Oceanology, Chinese Academy of Sciences高影响力机构 出　　处：《Science China Earth Sciences》索引2015年第58卷第8期,共21页高影响力期刊 基　　金：supported by the National Basic Research Program of China(Grant No.2015CB856105);the National Natural Science Foundation of China(Grant Nos.41372060,41430207,41130314,41121062);the Basic Geological Survey Programs of China Geological Survey(Grant No.1212011121258) 摘　　要：Continental orogens on Earth can be classified into accretionary orogen and collisional orogen.Magmatism in orogens occurs in every periods of an orogenic cycle,from oceanic subduction,continental collision to orogenic collapse.Continental collision requires the existence of prior oceanic subduction zone.It is generally assumed that the prerequisite of continental deep subduction is oceanic subduction and its drag force to the connecting passive-margin continental lithosphere during continental collision.Continental subduction and collision lead to the thickening and uplift of crust,but the formation time of the related magmatism in orogens depends on the heating mechanism of lithosphere.The accretionary orogens,on the other hand,have no strong continental collision,deep subduction,no large scale of crustal thrusting,thickening and uplift,and no UHP eclogite-facies metamorphic rocks related to continental deep subduction.Even though arc crust could be significantly thickened during oceanic subduction,it is still doubtful that syn-or post-collisional magmatism would be generated.In collisional orogens,due to continental deep subduction and significant crustal thickening,the UHP metamorphosed oceanic and continental crusts will experience decompression melting during exhumation,generating syn-collisional magmatism.During the orogen unrooting and collapse,post-collisional magmatism develops in response to lithosphere extension and upwelling of asthenospheric mantle,marking the end of an orogenic cycle.Therefore,magmatism in orogens can occur during the continental deep subduction,exhumation and uplift after detachment of subducted oceanic crust from continental crust,and extensional collapse.The time span from continental collision to collapse and erosion of orogens(the end of orogenic cycle)is 50–85 Myr.Collisional orogens are the key sites for understanding continental deep subduction,exhumation,uplift and orogenic collapse.Magmatism in collisional orogens plays important roles in continental reworking and net growth. 关 键 词：碰撞造山带 大陆碰撞 岩浆活动 山体崩塌 俯冲带 大陆深俯冲 地壳增厚 大陆岩石圈
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