摘要
中生代燕山陆内造山带是在克拉通软弱带上发育起来的。陆内造山作用受到深部条件的制约是与陆缘造山的主要区别。深部制约表现在:(1)继承性的构造活动;(2)断块的差异升降;(3)主动裂谷盆地演化;(4)岩石圈剧烈的构造变动。其中,岩石圈剧烈的构造变动和主动裂谷盆地演化直接受制于上地幔的影响,而断块差异升降是深部作用的间接反映。继承性的构造活动贯穿于燕山运动各个时期,其表现形式可以不同。这些深部影响因素随着时间是有变化的,存在交叉叠置,但是构造-岩浆活动的深度总的来说趋于越来越浅。与其他陆缘、陆间造山带对比,可以看到深部热体制调整在燕山陆内造山作用中是最重要的因素。陆内造山作用是上部地壳对岩石圈不同深度层次剧烈变动的响应,地壳以及岩石圈的加厚和随后的变薄是其实质性的构造过程,不仅导致岩石的变形,而且也引起了山脉的隆升。
The Mesozoic intracontinental orogeny of the Yanshan Mountains developed on a weak zone within the craton. The main difference between intracontinental orogeny and epicontinental and intercontinental orogeny is that the former is controlled by deep-seated factors： （1） inherited tectonic activities; （2） the differential uplift of fault blocks; （3） evolution of active rift basins; and （4） acute tectonic disturbance of the lithosphere. Among them, the acute tectonic events of the lithosphere and the evolution of active rift basins are directly related to the upper mantle. The differential uplift of fault blocks indirectly reflects deep tectonic process. Inherited tectonic events were important controls on intracontinental orogeny and occurred throughout all stages of Yanshan deformation but with different appearances. These deep-seated factors vary with time and interact with one another. The most important factor controlling Yansban intracontinental orogeny was variation of the deep-seated thermal regime. Intracontinental orogeny is the response of the upper crust to the dramatic movements of the lithosphere at different depths. Its essential tectonic processes are thickening and subsequent thinning of the crust and lithosphere, which results in not only deformation of rocks but also the uplift of the mountains.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2005年第3期137-148,共12页
Earth Science Frontiers
基金
国家自然科学基金资助项目(40372103)
关键词
燕山
中生代
陆内造山
深部制约因素
Yanshan Mountains
Mesozoic
intracontinental orogeny
deep-seated factors
