CAJ | 학술논문

2006年秋,国家海洋局第二海洋研究所在东沙隆起和潮汕(潮南)坳陷完成了OBS2006-3剖面.在整条剖面速度模型的基础上,采用2D层析成像方法,对潮汕(潮南)坳陷区7个站位的中生界折射震相进行了精细的反演成像.结果表明,坳陷内可分3个沉积层,前两层是新生代沉积,速度分别为2.2 km/s和3.6 km/s,厚度较小,不超过2 km.中生代沉积地层的速度从顶部的4.4 km/s向下逐渐增加到底部的5.4 km/s,厚度较大,最厚处为8 km左右.坳陷内速度是比较均匀地随深度增加的,成水平层状分布.重力反演表明,潮汕坳陷中生代沉积的平均密度为2.45 g/cm~3,地壳密度为2.86 g/cm~3,下地壳高速层密度为3.05 g/cm~3,莫霍面下面的上地幔密度为3.32 g/cm~3.
2006년추,국가해양국제이해양연구소재동사륭기화조산(조남)요함완성료OBS2006-3부면.재정조부면속도모형적기출상,채용2D층석성상방법,대조산(조남)요함구7개참위적중생계절사진상진행료정세적반연성상.결과표명,요함내가분3개침적층,전량층시신생대침적,속도분별위2.2 km/s화3.6 km/s,후도교소,불초과2 km.중생대침적지층적속도종정부적4.4 km/s향하축점증가도저부적5.4 km/s,후도교대,최후처위8 km좌우.요함내속도시비교균균지수심도증가적,성수평층상분포.중력반연표명,조산요함중생대침적적평균밀도위2.45 g/cm~3,지각밀도위2.86 g/cm~3,하지각고속층밀도위3.05 g/cm~3,막곽면하면적상지만밀도위3.32 g/cm~3.
The wide angle seismic profile OBS2006-3 crossing the Dongsha Rise and the Chaoshan and Chaonan Depressions of South China Sea was completed by the Second Institute of Oceanography,SOA in the autumn of 2006.Based on the inversed velocity model of the whole profile,a more accurate 2D tomography imaging was carried out in this paper for a smaller model and only refracted waves recorded by seven OBS stations in the Chaoshan and Chaonan Depressions were used.The imaging results show that there are three sediment layers in the depression area.The thicknesses of the first two layers of the Cenozoic sediments are very thin,less than 2 km with velocities of 2.2 km/s and 3.6 km/s,respectively.In the Mesozoic sediment layer the velocity increases gradually from 4.4 km/s at the top to 5.4 km/s at the bottom with a maximum thickness of 8 km and can be considered as a horizontal sub-layer.Based on the gravity simulation of OBS2006-3,the average density of the Mesozoic layer in the Chaoshan and Chaonan Depressions is 2.45 g/cm~3.The average densities of the profile OBS2006-3 in the crust,the high velocity layer and the upper mantle beneath Moho are 2.86 g/cm~3,3.05 g/cm~3 and 3.32 g/cm~3,respectively.