Study On The Sedimentation Of The Holocene Clinoform Offshore Of North-Eastern The Shandong Peninsula

clinoform is in the offshore of north-eastern the Shandong Peninsula. The clinoform, called the Shandong mud wedge, is up to 40 m thick nearshore and thins seaward. Its cause of formation and developed agd have been controversial since it was first noted in the 1980s. the thesis based on recent investigation offshore of the northeastern Shandong Peninsula, high-resolution shallow seismic profiles covering about 1800 km were obtained, and two-70m-depth drilling cores penetrating were recovered,opened the clinoform's edimentary character,age and developed history.The thesis'work consist:1) explained the high-resolution seismic profiles and ploted stratum, 2) drilling cores which described the lithofacies characteristics, measured grain size, obtained AMS 14C dates on 28 samples, identified benthic foraminifera and ostracoda and analyzed the mineral components of the cores,3) on these base,linked to the Holocene sea-level changes, discussed the clinoform's sedimentary process,influenced factors and related the Holocene sea-level changes.The shallow seismic profiles show that the clinoform comprises three units:from the lower to the upper, has SU3,SU2 and SU1,maximum thick up to 40m. SU3(less than 2-3m thick) shows a retrogradational/aggradational stacking pattern with subhorizontal internal reflectors, SU 3 is bounded by distinct erosion surfaces on the bottom ,SU2 is characterized by low-angle (less than 0.5°), mostly seaward-stepping internal reflectors downlapping onto the basal erosion surface, It has a maximum thickness of 35 m nearshore.SU1 (maximum thickness 18 m) exhibiting an aggradational reflection pattern with subparallel reflectors and incised underlying an undulating erosive surfaceMineral components of the cores suggest that the clinoform's provenance is predominantly Yellow River-derived sediments.