喜马拉雅东构造结西侧尼洋河口地区深部地球物理特征  

DEEP GEOPHYSICAL CHARACTERISTICS OF THE NIYANG RIVER ESTUARY AREA,WEST OF THE EASTERN HIMALAYAN SYNTAXIS

作　　者：张廷彦 张翔[1] 赵华聪 ZHANG Tingyan;ZHANG Xiang;ZHAO Huacong(Geophysical Survey Center,China Geological Survey,Langfang 065000,China)

机构地区：[1]中国地质调查局地球物理调查中心,河北廊坊065000

出　　处：《高原地震》2023年第1期10-14,共5页Plateau Earthquake Research

基　　金：中国地质调查局地质调查项目(项目编号:DD20211546)资助。

摘　　要：喜马拉雅东构造结位于喜马拉雅造山带东端。东构造结及其周边地层隆升和剥蚀极快是新生代变质和深熔作用最强的地区。东久—米林断裂带是东构造结的西侧边界断裂带,其不同部位的变形性质具有逐渐演化的特征。东久—米林断裂带穿过尼洋河口地区,枯水期该位置的水位下降,可开展音频大地电磁剖面测量。通过获得垂直于东九—米林断裂带的电阻率剖面,确定了该地区雅鲁藏布江缝合带的南北边界位置。同时电阻率剖面反应了该地区两侧断层的深部结构特征,为分析断裂带两侧的地层接触关系提供地球物理数据。The Eastern Himalayan Syntaxis is located at the eastern end of the Himalayan orogenic belt.The rapid uplift and denudation of the eastern tectonic junction and its surrounding strata are the strongest areas of Cenozoic metamorphism and deep melting.The Dongjiu-Milin fault zone is the west boundary fault of the East⁃ern Himalayan Syntaxis,and the deformation properties of different parts of the fault zone have the characteris⁃tics of gradual evolution.The Dongjiu-Milin fault zone passes through the Niyang estuary area,where the water level drops during the dry season,so audio magnetotelluric profile measurement can be carried out.By obtai⁃ning the resistivity profile perpendicular to Dongjiu Milin fault,the location of the northern and southern boundary of the Yarlung Zangbo suture zone in this area was determined.At the same time,the resistivity pro⁃file reflects the deep structural characteristics of the faults with both sides of the fault,and provides geophysi⁃cal data onto analyzing the stratigraphic contact relationship between both side with the fault.

关 键 词：东构造结 东久—米林断裂带 音频大地电磁 雅鲁藏布江缝合带 

分 类 号：P315.23[天文地球—地震学]