构造体制转折是岩石圈尺度的行为

Transformation of the tectonic regime is a lithospheric-scale activity

试将华北中生代的构造-岩浆演化划分为3个阶段:早中生代岩石圈结构的深部调整和底侵作用;中晚侏罗世的断块差异隆升和火山喷发;早白垩世的地壳伸展和岩石圈减薄。据此说明构造体制转折是一个渐变的过程,其动力来源应与岩石圈地幔乃至软流圈的运动相联系。因此,转折的过程应从深部开始,不同深度的响应必然有一个滞后效应。构造体制转折的标志也应是多方面的,其构造格局的转化是首位的,而且应从全球角度探讨它们的背景。

Mesozoic tectono-magmatic evolution of North China may be divided into three stages: deep modulation of the Early Mesozoic lithospheric architecture and underplating, Middle Jurassic fault-block differential uplift and volcanic eruption, and Early Cretaceous crustal extension and lithospheric thinning. Transformation of a tectonic regime is a gradual process and is dynamically related with movements of the lithospheric mantle and even the asthenosphere. Therefore transformation should have begun at depth and the responses at different depths are bound to have lagged to various degrees. The apparent marks of tectonic regime transformation are manifold, and tectonic framework transformation is first and its background should be explored from a global view-point.