Seismic Geomorphology, Evolution and Genesis of Shelf Sand Ridge, East China Sea

Abstract

Abstract:

The study on linear shelf sand ridges is always a hot topic in the field of marine geology and sedimentology. On the base of nearseafloor 3D seismic data which covers an area of 1 700 km2, the seismic geomorphology, sedimentary architecture, genesis and evolution of the shelf sand ridges were discussed in this paper. The following conclusions have been drawn from this study: (1) 7 NWSE oriented shelf sand ridge systems have developed in this study area. The seafloor in the study area is characterized by a ridgeandswale topography. Sand waves oriented NESW have been observed in the surface of the sand ridges. The ridge 1, ridge 2, ridge 4 and ridge 6 were composed of 2 to 3 crosscombining sand ridges. While the ridge 3, ridge 5 and ridge 7 were revealed as a single sand ridge in the study area. (2)The linear sand shelf ridges are asymmetric in cross section and are oriented parallel to the current direction. The sand ridges have a length between 2 km and 11km. Their heights are from 3 m to 31 m. The angle of dip of the slope is mostly less than 1°. (3) In this study area, the stage of the sand ridges between active sand ridge and moribund sand ridge have been indicated by the change of water depth and the velocity of tidal current. Investigation of sand ridges on the Quaternary shelf is of critical importance for predicting tidal sand reservoirs.

Key words: Quaternary, shelf sand ridge, seismic geomorphology, East China Sea

CLC Number:

TE121.2

LI Lei1, WANG Xiao-gang2, CAO Bing3, SHEN Wen-long3, YANG Lin4. Seismic Geomorphology, Evolution and Genesis of Shelf Sand Ridge, East China Sea[J]. Geoscience, 2013, 27(4): 783-790.

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