摘要
红河断裂带是认识板块相互运动、深部过程和地质演化的窗口,一直受到重视与关注,关于红河断裂带入海后的去向问题特一直是讨论和研究的热点.本文对15°N^25°N,102°E^112°E地区的重力、磁力数据进行了相关研究,结合哀牢山—红河断裂带地区的地震层析成像结果,对该断裂带入海之后的去向进行了讨论.并依据重力数据对莺歌海中的两条剖面重建了密度结构,认为该区浅部与深部构造存在明显的不协调性.同时认为莺歌海地区的中地壳中有一低密度层存在,推测红河断裂带在莺歌海地区的走滑,很有可能就是沿着这一层发生的.
As a window to know the plate mutual movement, deep process and geological evolution, Red River Fault Zone has being devoted much attention. Where the fault extends after going into sea area is a hotspot question to discuss and study. On the basis of gravity and magnetic research and refers to the seismic tomography result in Ailao Shan/Red River area, the extending of this fault zone in sea area was discussed in this paper. The density structure at two profiles was rebuilt according to gravity data. The inversion result shows that the shallow and deep structure are not in line. There is a low-density layer at middle crust in Yinggehai region. Perhaps the strike- slip of Red River Fault Zone in Yinggehai region was taken place along the layer.
出处
《地球物理学进展》
CSCD
北大核心
2005年第3期584-593,共10页
Progress in Geophysics
基金
国家基础研究973项目(G20000467-01)
国家自然科学基金资助项目(40276015)
国家自然科学基金重点项目(40034010)资助
关键词
重磁异常
密度结构
红河断裂带
gravity and magnetic anomaly, density-structure, red river fault zone
