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鄂东南铁山矩形石香肠基质层微区有限应变测量与分析

发表时间:2016-09-30  浏览量:1141  下载量:243
全部作者: 李绍凡,曾佐勋,周红智
作者单位: 中国地质大学(武汉)地球科学学院;湖北工业大学电气与电子工程学院;中国地质大学(武汉)地球科学学院;中国地质大学(武汉)华中构造力学研究中心;中国地质大学(武汉)资源学院
摘 要: 以该区成层分布、形态相近的矩形石香肠构造为研究对象,利用惯量椭圆法对其基质层进行有限应变测量,并对所得数据进行综合分析。研究表明,该矩形石香肠构造是由其上、下相邻基质层厚度相近,基质层中总体上的纯剪切拉伸减薄,能干层在垂直于拉伸方向上受挤压,局部相对富集于边界平直的裂隙处角岩层中的热液流体等综合作用形成的;发育成层分布且形态相近的矩形石香肠构造所需特征性条件是能干层上、下相邻基质层厚度相差不大,且受总体上持续的平行层面拉伸、垂直层面压缩的纯剪切共同作用。
关 键 词: 地质学;矩形石香肠构造;有限应变测量;应变分析;鄂东南铁山
Title: Strain Measurement Analysese in Matrix of Rectangular boudinage Structures in Tieshan, Southeast Hubei,China
Author: LI Shaofan, ZENG Zuoxun, ZHOU Hongzhi
Organization: School of Earth Sciences, China University of Geosciences,School of Electrical and Electronic Engineering, Hubei University of Technology,Huazhong Tectonomechanical Research Center, China University of Geosciences,Faculty of Earth Resources, China University of Geosciences,
Abstract: Using rectangular boudinage structures with similar boudins in the same layer in this area, through finite strain measurement at different microdomains of its matrix with inertia moment ellipse method. This study proved that rectangular boudinage structures in this location were formed due to comprehensive effects of similar thickness of matrix layers above and below the boudin, pure shear with extension parallel to the layer and with contraction perpendicular to the layer in most parts of matrix layers and competent layer’s vertical direction is squeezed. Besides, the hydrothermal flow concentrated relatively in hornfel layers near straight-shaped cracks also played a significant role. Characteristic features during the formation of rectangular boudins similar in shape and continuous in competent layer manifest in two aspects, namely, on the one hand, similar thickness between matrix layers, and on the other hand, the combined action of the sustained pure shear with extension parallel to the layer and with contraction perpendicular to the layer in most parts of matrix layers.
Key words: geology; rectangular boudinage; finite strain measurement; strain analysis; Tieshan in southeast Hubei
发表期数: 2016年9月第18期
引用格式: 李绍凡,曾佐勋,周红智. 鄂东南铁山矩形石香肠基质层微区有限应变测量与分析[J]. 中国科技论文在线精品论文,2016,9(18):1910-1921.
 
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