红河断裂带研究区深部结构特点的地球物理研究  

Geophysical research on deep structure feature in study region of red river fault zone

作　　者：郝天珧[1] 江为为[1] 胥颐[1] 丘学林[2] 刘建华[1] 戴明刚[1] 徐亚[1] 黄忠贤[3] 宋海斌[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院南海海洋研究所,广州510301 [3]中国地震局地壳应力研究所,北京100085

出　　处：《地球物理学进展》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

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.

关 键 词：重磁异常 密度结构 红河断裂带 

分 类 号：P738[天文地球—海洋地质] P313[天文地球—海洋科学]