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TitreThe sand ridge field of the South Yellow Sea: origin by river-sea interaction
AuteurWang, Y; Zhang, Y; Zou, X; Zhu, D; Piper, D
SourceMarine Geology vol. 291-294, 2012 p. 132-146, https://doi.org/10.1016/j.margeo.2011.01.001
Année2012
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100365
ÉditeurElsevier BV
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.margeo.2011.01.001
Mediapapier; en ligne; numérique
Formatspdf
Lat/Long OENS115.0000 130.0000 40.5000 20.0000
Sujetssables marins; sables; profils sismiques; milieu sédimentaire; Holocène; trangressions; érosion; sedimentation; sedimentation; trous de mine; origine; dorsales sous-marines; changements du niveau de la mer; analyses stratigraphiques; minéraux lourds; lithologie; établissement de modèles; milieux de marée; chenaux de marée; géologie marine; sédimentologie; stratigraphie
Illustrationssletch maps; seismic interpretations
ProgrammeÉnergie renouvelable offshore, Géoscience en mer
Résumé(disponible en anglais seulement)
The 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.
GEOSCAN ID287413