CAJ | 학술논문

主要介绍青藏高原东部下察隅-清水河(EHS3D-3)剖面的大地电磁(MT)探测结果.根据2007年沿该测线观测的MT数据,经过资料处理、分析和二维反演,得到了研究区岩石圈的电性结构.结果表明:沿剖面电阻率分布具有纵向成层,横向分区的特征;上地壳由不同大小的高阻体构成;拉萨地块和羌塘地体中下地壳分别存在一个大范围的低阻体,初步认为这2个低阻体由深部流体以及部分熔融所致,可能是高原东部环绕东构造结的2个物质流通道,同时也是高原南北两侧的2个主要剪切走滑带;雅鲁藏布缝合带和班公一怒江缝合带均表现为向北逐渐加深的相对低阻带,可能是俯冲板片表面低阻物质的反映;金沙江断裂深部表现为强烈的低阻体异常,但与该区其它缝合带的电性特征区别较大.
주요개소청장고원동부하찰우-청수하(EHS3D-3)부면적대지전자(MT)탐측결과.근거2007년연해측선관측적MT수거,경과자료처리、분석화이유반연,득도료연구구암석권적전성결구.결과표명:연부면전조솔분포구유종향성층,횡향분구적특정;상지각유불동대소적고조체구성;랍살지괴화강당지체중하지각분별존재일개대범위적저조체,초보인위저2개저조체유심부류체이급부분용융소치,가능시고원동부배요동구조결적2개물질류통도,동시야시고원남북량측적2개주요전절주활대;아로장포봉합대화반공일노강봉합대균표현위향북축점가심적상대저조대,가능시부충판편표면저조물질적반영;금사강단렬심부표현위강렬적저조체이상,단여해구기타봉합대적전성특정구별교대.
A new MT study was conducted along the profile EHS3D-3 ( Xiachayu of Tibet-Qingshuihe of Qinghai)in 2007. The preferred 2-D model suggests that:1 )the upper crust consists of separated resistive blocks;2) in mid-lower crust there is an extensive conductor beneath Lhasa block and Qiangtang terrain respectively due to aqueous fluids and/or partial melts and are inferred to as crustal flow channels at depth of Tiebtan Plateau; 3 ) Yarlun-Zangbo and Bangonghu-Nujiang sutures are indicated by two conductive layers dipping to the north; 4) Jinshajiang Fault might be a fracture belt of upper crust that was thinned and destructed by the upwelling of the hot/conductive body at depth.