碰撞后的造山过程及造山带巨量花岗岩的成因

POST-COLLISION OROGENY PROCESS AND ORIGIN OF HUGE QUANTITY GRANITES IN OROGENIC BELT

传统上认为造山作用是板块碰撞的结果，即近水平碰撞挤压引起物质的垂向加厚。事实上，许多山脉却是在碰撞后“造山”隆升的。碰撞后的拆沉作用、伸展垮塌、底侵作用等同样可以引起“造山”隆升，拆沉与底侵作用引起深部物质交换，伸展垮塌引起浅部物质迁移，这些作用使垂向物质密度发生变化，均衡补偿引起造山隆升。

According to traditional theory,orogeny is the result of plate collision.That is,horizontal collision compression increases the vertical thickness of an orogenic belt In fact,many mountain uplifts occurred postcollision.Post-collisional delamination,extension collapse and underplating can also cause mountain uplift.Delaminaton or underplating causes deep substance exchange,while extension collapse causes shallow substance migration.Delamination and extension collapse make the vertical substance density varied.thus,isostatic compensation arouses mountain uplifting.At the same time,the intrusion of huge quantity granites is one of the outstanding characteristics during post-collision orogeny process.