论文部分内容阅读
南海中央次海盆残余扩张脊的深部地震探测对于研究南海的形成演化和动力学机制至关重要.本文借助拉布拉多海残余扩张脊内部结构的研究,获得了扩张脊在扩张期和扩张后形成过程的认识.并从多个方面将拉布拉多海与南海进行对比分析,对残余扩张脊的形成环境和形成机制等得到了一些初步认识:两者同属于慢速扩张,扩张过程中,构造作用占主导地位,岩浆作用次之,扩张脊内部结构具有相似性;海盆扩张时期,两者都发生了洋脊跃迁,指示了重要了构造事件;两者的大陆边缘同属于非火山型不对称被动大陆边缘,海盆扩张初期岩石圈以拉张为主,岩浆活动较弱等.这些认识必将为南海中央次海盆残余扩张脊的内部结构研究以及后期的地质解释提供思路和依据.
Deep seismic exploration of the residual spill ridges in the Central South China Sea basin is very important for the study of the evolution and dynamics of the South China Sea.In this paper, based on the study of the internal structure of the residual ridges in the Labrador Sea, The understanding of formation process and comparative analysis of the Labrador Sea and the South China Sea from several aspects, some preliminary understanding of the formation environment and formation mechanism of residual expansion ridges, etc. are obtained: both belong to the process of slow expansion and expansion , The tectonism dominates, the magmatic effect is second, and the internal structure of dilapidation ridge is similar. During the basin expansion, the oceanic ridge transition occurred in both of them, indicating the important tectonic events. The continental margins of both are the same as non-volcanic The asymmetrical passive continental margin, the initial extension of the basin to pull the main stretch, magmatic activity is weak, etc. These understanding will surely provide an idea and basis for the study of the internal structure of the residual expansion ridges in the South China Sea and the subsequent geological interpretation.