潮汕坳陷地壳结构探测初步成果  

The Primary Results of the Crustal Structure Investigation of Chaoshan Depression

作　　者：王嘹亮[1] 张志荣[1] 阎贫[2] 罗文造[1] 

机构地区：[1]广州海洋地质调查局,广州510760 [2]中国科学院南海海洋研究所,广州510301

出　　处：《南海地质研究》2003年第1期62-67,共6页Gresearch of Eological South China Sea

摘　　要：应用长排列大容量震源地震采集系统与海底地震仪同步联合作业技术,在潮汕坳陷采集了228km多道反射地震资料和5个海底地震仪(OBS)站位的地震数据。多道地震剖面显示,珠江口盆地潮汕坳陷的沉积盖层可分为三个构造层。初步分析认为,上构造层为新近系-第四系,中构造层为下白垩统,下构造层为上三叠统到下侏罗统。OBS记录到了包括莫霍面在内的地震波,可以识别地壳内沉积层、上地壳层、下地壳层等多个层位的折射波地震相。莫霍面深度自北往南减小,在200m水深线附近为27km,至2000m水深线附近为14km。多道地震记录与海底地震仪记录相结合,可以控制从海底到莫霍面的地壳结构。Multi-channel seismic reflection profiles 228km long and 5 Ocean Bottom Seismo- graph (OBS) stations information has been obtained in the Chaoshan depression, which is col- lected by synchronized joint operation of long spread and large power source seismic acquisition system with OBS. The sedimentary cover of the Chaoshan depression was divided into three structure layers based on multi-channel seismic profiles analysis, the upper structure layer is composed of Neogene to Quaternary, the middle structure layer is Lower Cretaceous, the lower structure layer is composed of Upper Triassic to Lower Jurassic. The OBS has recorded Moho and other seismic waves, the sedimentary layer, the upper crust layer and the lower crust layer can be identified from it. From north to south along the NHC-1 measuring line, the Moho depth becomes shallower, 27km near 200m water depth line, and 14km near 2000m water depth line. Combined multi-channel seismic records with OBS information, the crustal struc- ture from ocean bottom to Moho can be recognized.

关 键 词：南海北部 潮汕坳陷 长排列 大容量震源 海底地震仪 

分 类 号：P542[天文地球—构造地质学]