CAJ | 학술논문

平衡剖面技术是一种基于几何守恒原理的应用于造山带和盆地结构恢复的方法.本文以挤压环境下形成的南天山西段前陆褶皱冲断带为例,对其典型二维地震剖面进行变形分析和平衡剖面恢复.结果表明,从平面上可将该冲断带划分为多排近似平行、东西走向的背斜带,由南往北依次为喀什、阿图什、托帕一康西维尔和喀拉伯克托尔一温古尔背斜带:从剖面上可以将该冲断带划分为两个不同层次的推覆构造系统:浅层为大规模叠瓦式冲断系统;深层为原地隐伏双重冲断构造系统.对重点剖面进行平衡剖面分析,得出自上新世以来研究区南北构造缩短量为49.1 km,缩短率为50.51%.地壳平均缩短速率为13.72 mm/a.
평형부면기술시일충기우궤하수항원리적응용우조산대화분지결구회복적방법.본문이제압배경하형성적남천산서단전륙습추충단대위례,대기전형이유지진부면진행변형분석화평형부면회복.결과표명,종평면상가장해충단대화분위다배근사평행、동서주향적배사대,유남왕북의차위객십、아도십、탁파일강서유이화객랍백극탁이일온고이배사대:종부면상가이장해충단대화분위량개불동층차적추복구조계통:천층위대규모첩와식충단계통;심층위원지은복쌍중충단구조계통.대중점부면진행평형부면분석,득출자상신세이래연구구남북구조축단량위49.1 km,축단솔위50.51%.지각평균축단속솔위13.72 mm/a.
The technique of balanced section is based on the geometric conservation principle to restore the structure of orogenic and basin.Took the Western part of the foreland fold-thrust belt in Southern Tien Shan for example,which formed in a compressional tectonic setting,this paper analysed tectonic deformation and the balanced section of the typical 2D seismic profiles in this area. The result shows that the fold-thrust belt can be divided into several rows of anticlines on plane which are almost parallel and E-W-trending, such as Kashi,Atushi,Tuopa-Kangxiweier and KaboketuoerWenguer from south to north. In profile, it can be divided into two different levels of thrust system:The shallow part is a large scale imbricate thrust system;the deep structure is in-situ buried duplex structure system. Analysed the balanced section of the key profile in this area, concluding that this area is shortened by 49.1 km (from north to south)since Pliocene in shortening ratio of 50.51%,its average crustal shortening rate is 13.72 mm/a.