摘要
本研究项目是采用诸如地质学解释、影像判读和地球物理探测等多种方法相结合进行的。在所得结果 的基础上参考了越南国内外同行的一些资料编制了东南亚、越南及邻区的断裂构造图,其比例尺分别为1∶4百万 和1∶1百万。分析所得结果显示出东南亚断裂构造演化的下列情况: 1)在现今地质结构方面 东南亚是欧亚岩石圈板块的东南部分,由一条消减带围绕,这条消减带的伸展从 Myanmer开始,通过Nicobar,JavaTimor直到东菲律宾。东南亚被SongHong(即红河)断裂,ThreePagodas断裂 和Hainam Natuna断裂等2级断裂系统分成3个微板块。 2)在早新生代,东南亚是分为5个微板块的。它们的分界断裂中有2个一级断裂(中央东海扩张带和Lupar Kuching消减带)和3个二级断裂(即上述3个)。 3)上述绝大多数二和三级断裂从晚新生代起活化且继承了从早新生代即已发生和发展了的二、三级断裂,但 在某些条件下,运动方向却完全变成了相反,尤其是走滑运动的方向。我们的研究结果表明:在这一地区内,盆地、 隆起、岩浆侵入、褶皱和局部断裂等构造的形成都取决于这些沿着一、二级走滑断裂的微板块运动。
In this research project, the combination of methods such as geological data interpretation, image interpretation and geophysical survey is used. On the basis of the obtained results and referenced data from colleagues in Vietnam and abroad, the faulting tectonic map of SE Asia at 1: 4 000 000 scale and of Vietnam and adjacent areas at 1: 1 000 000 scale have been compiled. The analysis of the obtained results shows that:;1) In the present geostructural respect, SE Asia is a SE part of the Eurasian lithosphere plate, surrounded by a subduction zone (first order fault) extending from Myanmar through Nicobar, Java, Timor, to East Philippines. SE Asia is divided into three micro plates by the system of second order faults: Song Hong fault (Red River fault), Three Pagodas fault and Hainam-Natuna fault.;2) In Early Cenozoic Era, SE Asia was divided into 5 micro plates, the boundaries between them were two faults at first order(the Central East Sea spreading zone and the Lupar-Kuching subduction zone) and three faults of second order(Red River fault, Three pagodas fault and Hainam-Natuna fault).;3) Most of the faults of second and the third order have been activated since Late Cenozoic, which inherited the second and third order faults which had already generated and developed in Early Cenozoic, but on some conditions they have changed completely into reverse movement directions, especially for their strike-slip movements. As our research results, the formation of the basins, uplifts, magmatic intrusions, folding and local faulting in this area depend on the movement of the micro plates along the first and the second order strike-slip faults.
出处
《大地测量与地球动力学》
CSCD
北大核心
2005年第1期51-60,共10页
Journal of Geodesy and Geodynamics
