摘要
根据已积累的由多种不同方法所测得的丰富的构造应力资料客观地揭示了驱动构造运动所需应力的大小及其空间展布规律。统计分析结果表明，现今不同类型的构造单元，包括构造活动区在内，其构造应力绝大部分都以近水平方向的压应力为主；上地壳最大主应力一般为（１０～３０）ＭＰａ，最小主应力一般为（２～２０）ＭＰａ，最大差应力一般为（２～２５）ＭＰａ。在造山带，构造应力的大小与造山作用强度呈明显的正相关关系。岩石圈底部构造应力一般为（０．１～１．０）ＭＰａ的量级。岩石圈表部的构造应力随深度的增加而加大，岩石圈深部的构造应力随深度的增加而减小。
Now abundant data of stress measurements have been accumulated,which may be used to determine the stress magnitude needed for driving the motion of lithospheric blocks and to study the distribution regularity of stresses at different depths of the lithosphere.Statistical analyses show that the present tectonic stresses in most of the earths surface are predominated with the horizontal compressional stresses;that most of the main maximum stresses range from (10-30) MPa,most of the main minimal stresses range from (2-20) MPa,and most of the maximum differential stresses range from (2-25) MPa for the upper crust of the earth.The tectonic stresses exist positive correlationship with the orogenic strength during the orogenic periods in the orogenic belt.The tectonic stresses increase with depth in middle upper crust and decrease with depth in middle lower lithosphere.
出处
《地质科技情报》
CAS
CSCD
北大核心
1997年第3期27-32,共6页
Geological Science and Technology Information
基金
地矿部地质力学开放实验室资助
地矿部"九五"重点基础研究项目
关键词
岩石圈应力
空间分布
构造运动
岩石圈
lithospheric stress,spatial distribution,tectonic movement
