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为了探测西藏高原南部雅鲁藏布江缝合带地区地壳浅部和深部构造沿东西和南北方向的变化特征 ,在雅鲁藏布江缝合带地区布设了三条南北向剖面 (错那—墨竹工卡、亚东—雪古拉、吉隆—措勤 ) ,采用超宽频带大地电磁测深方法进行了地壳、上地幔电性结构探测研究 ,发现该区主要电性结构特征为 :1.雅鲁藏布江缝合带附近表层发育大规模的高阻体 ,岩体延伸最深达 30km以上 ,是冈底斯花岗岩体的反映 .2 .雅鲁藏布江缝合带的南部有小规模的良导体 ,在其下方和北侧发育有大规模良导体 .3.沿剖面从南往北壳内普遍发育良导体 ,各良导体主体间是不连续的 ,规模逐渐增大 ,总体北倾 ,在缝合带附近产状较陡 .4 .在雅鲁藏布江缝合带附近良导体由西往东规模逐渐增大 ,导电性逐渐变好 ,相对雅鲁藏布江在剖面上的位置逐渐南移 .这些重要的电性特征可能是印度板块向北俯冲所形成的 ,深部大规模的良导体特征沿东西向的差异可能是板块碰撞引起物质沿东西向运移作用的结果
In order to detect the variations of the crustal shallow and deep structures along the east, north, south and north of the Yarlung Zangbo River suture zone in the southern Tibet Plateau, three north-south profiles are located in the suture zone of the Yarlung Zangbo River (Erna-Mozhugongka, Yadong-Shiguluo, (Institute of Geophysics, Chinese Academy of Sciences, Beijing 100081, China) A study on the electrical structure of the crust and upper mantle was carried out by ultra-broadband electromagnetic tem- perature dating method. The main electrical structural features of this area are: 1. Large-scale high resistivity body developed near the surface of the Yarlung Zangbo River suture, The deepest extension of rock mass is above 30km, which is a reflection of the Gangdese granite.2.A small scale good conductor is found in the south of the Brahmaputra suture zone, and a large scale good conductor is developed below and north of it.3.From the south In the northern crust, a good conductor is generally developed, the main bodies of each good conductor are discontinuous, the scale is gradually increased, and the overall north dip is steeper near the suture.4.A good conductor in the vicinity of the Yarlung Zangbo suture zone extends from west to east Scale gradually increased conductivity gradually better, relative to the Brahmaputra in the profile of the location of the gradual south.This important electrical characteristics may be Indian plate Northward subduction formed, a large-scale deep features a good conductor along the east-west differences may be caused by collision in the substance of what results to the effect of migration