碰撞造山带的碰撞事件时限的确定  

Time limit of collision event of collision orogens.

作　　者：李继亮[1] 孙枢[1] 郝杰[1] 陈海泓[1] 侯泉林[1] 肖文交[1] 吴继敏 

机构地区：[1]中国科学院地质研究所

出　　处：《岩石学报》1999年第2期315-320,共6页Acta Petrologica Sinica

基　　金：国家305项目;中国科学院重大A项目

摘　　要：在造山带研究中，引发变形作用和山脉隆升的造山作用的时代是一个重要问题。现在，Ｓｔｔｉｌｅ的造山幕术语已经被人们摈弃了，但是，迄今还有不少地质学家沿用诸如印支运动、燕山造山作用和喜马拉雅造山幕之类的术语。碰撞造山作用是一个在碰撞事件之后的均变过程。碰撞事件没有遗留下任何可以观察到的地质记录，因此，我们必须运用碰撞事件发生前和发生后产生的地质记录来限定碰撞事件的时代范围。在本文中，运用大洋岩石圈消减过程中的沉积作用、岩浆作用和变质作用来限定碰撞下限，运用碰撞后同造山时期的岩浆作用和变质作用以及磨拉石沉积作用来作为碰撞事件的时代上限。所有这些时代标志都是依据地质观察提出的。In the study of orogenic belts,the time of the orogeny is important inducing the deformation and uplift of the mountains.Stille's orogenic phases have been abandoned,but many geologists use the terms such as Indosinian movement,Yanshanian orogeny and Himalayan phases as yet.The collision orogeny is a uniformitive process after the collision event.The collision event has not left any observable geological record.Therefore,geologists have to use the geological records occurred before and after the collision event to limit the temporal point. In this paper,the lower temporal limits of collision event are prescribed by the sedimentation,magmatism and metamorphism during the subduction of oceanic lithosphere,and the upper limits are set by the deformation,syn orogenic magmatism and metamorphism as well as molass sedimentation.All the limit indexes are obtained from the geological observations and many other indexes will be complemented by the further investigations.

关 键 词：碰撞造山作用 碰撞事件 造山带 时限 

分 类 号：P542.2[天文地球—构造地质学]