Continued Studies of Single Layer Buckle Folding in Non-Linear Fluids and Rocks

本研究将继续利用计算机模拟和自然褶皱研究来分析单层褶皱的发育。目的是更好地理解非线性材料的折叠过程，在面向斜向主体应变方向的层中，以及在经历非同轴应变的层中。有限元模型将用于研究对称褶皱中形状和应变分布的变化，作为粘度对比、幂律指数、层的初始形状和初始波长的函数。将对称褶皱的发育与在单纯剪切或受纯剪切作用的斜地层中发育的不对称褶皱的发育作一比较。将根据褶皱形状和应变制定标准，这将提供岩石整体变形路径的信息。将研究自然褶皱的弧长与厚度分布、褶皱形状和应变模式。这些来自自然褶皱的数据将与实验数据进行比较，以便深入了解它们在变形过程中的流变性。这一研究结果将大大提高我们对构造褶皱过程中岩石行为的认识。

This study will continue analysis of fold development in single layers by use of computer modelling and by the study of natural folds. The aim is to better understand folding processes in non-linear materials, in layers oriented oblique to the principal bulk strain directions, and in layers that undergo non- coaxial strain. Finite element models will be used to study variations in shape and strain distribution in symmetrical folds as functions of viscosity contrast, power-law exponent, initial shape, and initial wavelength of the layers. A comparison will be made between the development of symmetrical folds & that of asymmetrical folds that develop either in simple shear or in oblique layers subjected to pure shear. Criteria will be developed, based on fold shape and strain, that will give information on bulk deformation paths in rocks. Natural folds will be studied for arc length vs. thickness distribution, fold shape, and strain pattern. These data from natural folds will be compared with the experimental data in order to gain insight on their rheology during deformation. The results of this study will greatly improve our understanding of rock behavior during tectonic folding.