摘要
对目前存在的 3种应变率约束条件 (常应变率 ,常构造力 ,与应变率有关的构造力约束 )进行了讨论 ,它们都不能真实地反映岩石圈内的应变率分布及实际观测 .基于近几年GPS测量的研究结果 ,提出利用GPS实测应变率对岩石圈流变结构进行约束的新方法 .对华北地区实际流变剖面的计算结果表明 ,本文方法克服了上述三种约束条件的不足 ,利用它所确定的岩石圈流变结构更为合理 ,在流变性质上较好地反映了与大地构造的对应关系 ,而且一定程度上反映岩石圈内各种状态参量及物质参量对流变结构的影响 .
There are three constraints on the rheological structure of the lithosphere, namely, constant strain rate, constant tectonic force and the strain-rate-dependent force. However they can not describe the realistic distribution of the strain rate in the lithosphere. We present a new constraint on the rheological structure of the lithosphere whose strain rate obtained from GPS data. The calculation for the rheological structure of the lithosphere in North China indicates that this constraint can overcome the difficulties faced by the three constraints mentioned above, and more reliable rheological structure of the lithosphere can be obtained under this new constraint. Not only can the relationship between the geotectonic and rheology be reflected better, but the influences of other state or material parameters on the rheological structure can also be reflected to some extent. Problems of this constraint are also discussed.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第6期1029-1034,共6页
Chinese Journal of Geophysics
基金
国家重点基础研究发展规划项目 (G95 13 0 4 0 6)
国家自然科学基金 ( 4 0 1740 2 3 )
关键词
岩石圈
流变结构
应变率约束
GPS
Lithoshphere, Rheological Structure, Constraint of Strain Rate, GPS.
