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

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Science China Earth Sciences 2015年第7期58卷 1284-1304页

作者： SONG ShuGuang WANG MengJue WANG Cao NIU YaoLing MOE Key Laboratory of Orogenic Belt and Crustal Evolution School of Earth and Space SciencesPeking University Department of Earth Sciences Durham University Institute of Oceanology Chinese Academy of Sciences

continental orogens on Earth can be classified into accretionary orogen and collisional *** in orogens occurs in every periods of an orogenic cycle,from oceanic subduction,continental collision to orogenic *** collision requires the existence of prior oceanic subduction *** 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 *** 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 *** 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 *** though arc crust could be significantly thickened during oceanic subduction,it is still doubtful that syn-or post-collisional magmatism would be *** 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 *** 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 ***,magmatism in orogens can occur during the continental deep subduction,exhumation and uplift after detachment of subducted oceanic crust from continental crust,and extensional *** time span from continental collision to collapse and erosion of orogens(the end of orogenic cycle)is 50–85 *** orogens are the key sites for understanding continental deep subduction,exhumation,uplift and orogenic *** in collisional orogens plays impo

关键词： collisional orogeny continental deep subduction orogen unrooting and collapse magmatism continental net growth

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