富蕴地区阿尔泰造山带有限应变测量和应变恢复  

Finite Strain Measurement and Strain Reconstruction of the Altay Orogen in Fuyun

作　　者：张进江[1] 郑亚东[1] 

机构地区：[1]北京大学地质学系,100871

出　　处：《地质学报》2003年第1期55-60,共6页Acta Geologica Sinica

基　　金：国家自然科学基金(编号40172074);全国优秀博士学位论文作者专项资金项目(编号200022);国家"973"项目(编号2001CB409804)资助成果

摘　　要：本文采用褶皱等倾线法、砾石三维应变和S-C夹角等应变测量方法,对富蕴地区阿尔泰造山带一个50km的剖面进行了系统的有限应变测算,得出其顺层缩短和剪应变剖面图。测量结果表明,该剖面褶皱压扁的顺层缩短量高达78％,断层处的剪应变(γ)最大可达8左右。三维应变分析和Flinn图解表明该区应变主要为平面应变,断层活动为简单剪切。利用分段积分和正态曲线恢复方法对剖面的缩短和剪切进行应变恢复,结果表明该剖面由原宽为267.2 km的原始剖面经缩短和剪切而形成。In the study a systematic finite strain measurement was made on a 50 km-wide section across the Altay orogen in the Fuyun region, with methods such as the dip-isogon of folds, three-dimensional strain of pebbles and S-C angle. Longitude and shear strain sections are constructed by these measurements. The results show that the shortening caused by the flattening of folds is up to 78% and the largest shear strain in faults is over 8. The three-dimensional strain and Flinn diagram analyses show that this area has experienced plane strain, and the faults have undergone simple shearing. Strain reconstruction for the shortening and shear deformation was accomplished with integration and reconstruction of normal distribution curves. It shows that the present 50 km-wide section was formed from a section with an original width of 266. 2 km by shortening and shearing.

关 键 词：阿尔泰造山带 有限应变测量 应变恢复 分段积分 正态曲线恢复方法 断层活动 

分 类 号：P542.2[天文地球—构造地质学]