北黄海浅层声学地层

SHALLOW SEISMIC RECORDS AND LATE PLEISTOCENE STRATIGRAPHY OF THE NORTH YELLOW SEA

通过对北黄海高分辨率浅地层剖面的分析解译,划定了具有层序意义的9个声学反射地层单元或亚单元(SU11、SU12、SU13、SU2、SU3、SU41、SU42、SU43、SU5)。通过典型声学地层剖面与区内钻孔的沉积地层岩性单元对比,发现依据浅地层剖面进行的声学地层划分与钻孔岩心的沉积地层划分有较好的对应关系,同时得到各声学反射层的沉积时代、岩性及沉积环境。结合区内钻孔的分析结果,划分了3个海进海退沉积层序,确认了SU1、SU3、SU5声学反射地层单元分别对应氧同位素1期、3期、5期的海侵沉积,SU2、SU4声学反射地层单元分别对应氧同位素2期、4期的海退沉积。

High resolution shallow seismic profiles were interpreted in this paper for establishing the stratigraphic sequence of the North Yellow Sea.Nine stratigraphic units or sub-units（SU11,SU12,SU13,SU2,SU3,SU41,SU42,SU43,SU5） were recognized based on the seismic data and some cores collected from this region.Results suggest that the stratigraphic units established upon shallow seismics are correlative with the core records obtained from previous studies.There occur three ＂transgression-regression＂ cycles.The stratigraphic units of SU1,SU3,SU5 were respectively corresponding to the transgressive deposits formed in the marine isotope stage 1,marine isotope stage 3,and marine isotope stage 5,while the stratigraphic units of SU2,SU4 corresponding to the regressive deposits formed during the marine isotope stage 2 and marine isotope stage 4.