GEOSCAN Search Results: Fastlink


TitleThe sand ridge field of the South Yellow Sea: origin by river-sea interaction
AuthorWang, Y; Zhang, Y; Zou, X; Zhu, D; Piper, D
SourceMarine Geology vol. 291-294, 2012 p. 132-146,
Alt SeriesEarth Sciences Sector, Contribution Series 20100365
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
AreaSouth Yellow Sea; China
Lat/Long WENS115.0000 130.0000 40.5000 20.0000
Subjectsmarine geology; sedimentology; stratigraphy; marine sands; sands; seismic profiles; depositional environment; Holocene; transgressions; erosion; deposition; sedimentation; boreholes; provenance; submarine ridges; sea level changes; stratigraphic analyses; heavy minerals; lithology; modelling; tidal environments; tidal channels
Illustrationssletch maps; seismic interpretations
ProgramOffshore Geoscience, Offshore Renewable Energy
AbstractThe origin of a large field of sand ridges offshore from the north Jiangsu coast in the South Yellow Sea has been investigated on the basis of bathymetry, seabed samples, high-resolution seismic profiles and 31 to 71 m deep boreholes. Sediment composition including heavy minerals and clay minerals sampled from surface sediments shows that most of the sand was derived from the Changjiang (Yangtze) River, but in the northern part of the field particularly the clay came from the Huanghe (Yellow) River. Seismic profiles show late Pleistocene distributary channels of the ancient Changjiang River underlying much of the southern part of the sand ridge field. The Holocene transgression cut a widespread ravinement surface reworking abundant late Pleistocene sandy sediment. The available sand was reworked by tidal currents into large ridges. The location of the ridges is strongly influenced by relict channels in the southern part of the field and by tidal currents in the northern, and especially the northeastern part of the field, resulting in a radiating ridge pattern. These ridges provide an example of the evolution of a large scale geomorphic feature resulting from river--sea interaction, in which climatic and sea level changes played an important role.