陈氏网格法及其在地质学中的应用初探——以韧性剪切带有限变形实验为例

CHEN'S GRID METHOD AND ITS FIRST APPLICATION TO GEOLOGY TAKING FINITE DEFORMATION EXPERIMENT ON DUCTILE SHEAR ZONE AS AN EXANPLE

本文介绍一种透用于构造模型有限应变测定的网格法。这种方法,既区别于弹性小变形的“应变花网格法”,也区别于 Dixon 发展的大变形“变形椭圆网格法”。它是陈至达教授拖带系应变-转动分解理论的直接应用。故此,本文称其为陈氏网格法。文中不仅介绍了陈氏网格法的基本原理,而且以韧性剪切带为例,为陈氏网格法在构造地质学中的应用,给予了具体说明。结果表明,陈氏网格法是一种有效的构造变形实验方法。并且,当采用作者编制了电算程序,这一方法显得更为简便,容易为一般地质工作者所掌握。

A new grid method for determining finite strain in geological structure models in introduced in this paper. It is different not only from 'Strain Rosettes Grid Method' for small elastic deformation but also from'Deformation Ellipsoid Grid Method' for large deformation developed by J.M.Dixon. This method is a direct application of resolution theory of strain and rotation developed in co-moving system by prof. Chen Zhida, so it is called Chen's Grid Method here . The basic principles of Chen's Grid Method is introduced. Its application to structural geology is concretely illustrated by taking ductile shear zone as an example. It is concluded that Chen's Grid Method is an effective method for experimental analysis of large tectonic deformation. It is more convenient than other grid methods and easy to be mastered by geologist, especially when the computer program worked out by the authors is adopted.