初论福建推覆构造

A PRELIMINARY DISCUSSION ON NAPPE STRUCTURE IN FUJIAN

本文通过实例说明了福建省推覆构造是广泛发育的,根据推覆构造介入的地层特点和发育所在的层位,将推覆构造划分三种基本类型:即基底逆冲推覆构造、盖层间拆离推覆构造和盖层间逆冲推覆构造。并按类型较详细地总结了推覆构造发育的基本特点。明确指出了基底逆冲推覆构造和盖层间拆离推覆构造是福建最基本的构造类型,对福建省基本的构造特点具有重大的影响。推覆构造的形成是受同一的、继承性的由北西向南东挤压应力作用,具有间歇性、多期次的特点形成的时代,主要是印支期和燕山早期、燕山晚期又继续发生推覆,并定位予白垩纪。文中对推覆构造的发生和发展模式提出了新的认识。

The writer classified the nappe tectonic in Fujian into three basic Patterns in accordance with their position and strata behavior involved. They are the basement overthrusting, the inner cover dissociating and the inner cover overthruting nappe structures. Acletailed study has been made on their developing characters. It is noted that the most common structure patterns may be the overthrusting and the inner cover dissociating nappe structures, which have agreat influence on the tectonic framework of Fujian. The nappe strttctares are originated under the action of a continuing compressive stress in the direction from northwest to southeast, with intermit tency and multiphase. Their principal pericds of origination were in Indo-Chinese and early Yanshanian epochs. They continued to overthrust in later Yanshanian and concluded in Cretaceous.The writer also discusses the originating and developing patterns of the nappe tectonic with his recent viewpoint.