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The infralittoral prograding wedge: a new large-scale progradational sedimentary body in shallow marine environments 总被引:1,自引:1,他引:0
F. J. Hernández-Molina L. M. Fernández-Salas F. Lobo L. Somoza V. Díaz-del-Río J. M. Alveirinho Dias 《Geo-Marine Letters》2000,20(2):109-117
A progradational sedimentary body, the infralittoral prograding wedge (IPW), has been developing from the mean fair-weather
wave-base level to the storm wave-base level between the onshore (beach) and the offshore (inner continental shelf) depositional
zones along the Spanish coast during the Late Holocene. The main sedimentary body is composed of large inclined master beds
which prograde seawards parallel to the shoreline, formed by sediments swept offshore by waves from shallow-water littoral
environments. The inclined beds downlap onto finer-grained offshore sediments and, in turn, are overlain by shoreface deposits.
The IPW is generated by downwelling storm currents and associated seaward transport of sediment. It represents a new depositional
model for clastic wave-dominated coasts, and its identification requires a new subdivision of the nearshore environment.
Received: 10 June 1999 / Revision accepted: 15 February 2000 相似文献