摘要
印支半岛北部地区与青藏高原东南缘紧邻,历史上经历新、旧特提斯洋闭合等复杂的构造变形过程,特别是新生代以来的青藏高原隆升产生的东南向的物质挤出,对该区域的构造变形产生进一步影响.我们通过计算收集到的140个流动地震台站的接收函数,得到了13个稳定的转换波双层各向异性结果.结果显示云南南部的思茅块体和越南奠边府断裂带附近可能存在上下地壳解耦,上地壳的各向异性主要受区域内的走滑断层和矿物定向排列影响,下地壳各向异性可能与地壳物质流有关;越南段的奠边府断裂带只切穿上地壳,下地壳物质流可能穿过奠边府断裂带挤入越南西北部地区,但没有贯穿至南海.
The northern region of the Indochina Peninsula is adjacent to the southeastern margin of the Tibetan Plateau and has historically undergone complex tectonic deformation processes such as the closure of the Old and New Tethys Oceans,especially the southeastward material extrusion from the uplift of the Tibetan Plateau since the Cenozoic,which has further influenced the tectonic deformation in the region.We obtained 13 stable transform wave double-layer anisotropy results by calculating the receiver functions of 140 collected mobile seismic stations.The results show that the upper and lower crust may be decoupled near the Simao block in southern Yunnan and the Dien Bien Phu Fault Zone in Vietnam,and the anisotropy of the upper crust is mainly influenced by the strike-slip faults and the directional alignment of minerals in the region,while the anisotropy of the lower crust may be related to the crustal material flow;the Dien Bien Phu Fault Zone in the Vietnamese section only cuts through the upper crust,and the lower crustal material flow may be extruded through the Dien Bien Phu Fault Zone into the northwestern region of Vietnam,but not through to the South China Sea.
作者
程成
黄柏寿
郝天珧
CHENG Cheng;HUANG Bor-Shouh;HAO TianYao(Key Laboratory of Petroleum Resource Research,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Earth Sciences,Academia Sinica,Taipei 11529,China)
出处
《地球物理学报》
北大核心
2025年第11期4247-4258,共12页
Chinese Journal of Geophysics
关键词
印支半岛
接收函数
各向异性
奠边府断裂
地壳流
Indochina Peninsula
Receiver function
Anisotropy
Dien Bien Phu Fault
Crust channel flow
