PRIMARY STUDY ON SEISMIC STRATIGRAPHY OF THE AREA SURROUNDING BOREHOLE NHH01, SOUTH YELLOW SEA

Based on the high-resolution reflection seismic data collected from the mud area surrounding the borehole of NHH01 in the Central South Yellow Sea (SYS) and the core data of the hole, we descried and analyzed the depositional and tectonic environments of the study area. On the profiles there are 10 seismic units recognized with seismic stratigraphy. The geological age of seismic units was determined according to the chronology framework of the Hole NHH01. Comparing with marine isotope stages, more than 10 cycles or units are missing, that indicates the restriction of the application of the marine isotope stages to continental shelve. Some faults are identified on the profiles, and most of them remain active till mid Pleistocene. Therefore, it is inferred that the last tectonic movement may have extended to late Pleistocene. The Hole of NHH01 is located in a tectonic depression formed by the uplifting of neighboring blocks. This tectonic setting might provide the answer to the formation of greigite at the depth of 44.90~51.80 m