Dong H.,Ocean University of China |
Dong H.,Key Laboratory of Hydrocarbon Resource and Environmental Geology |
Li G.,Ocean University of China |
Li s.,Key Laboratory of Hydrocarbon Resource and Environmental Geology |
And 5 more authors.
Journal of Ocean University of China | Year: 2011
The distributions of thickness of unconsolidated Quaternary sedimentary layers in Jiaozhou Bay and Qingdao offshore area were studied by using 1079-km high-resolution shallow seismic profiles and drilling core data, and the factors controlling the Quaternary evolution were discussed. The results show that such thickness distributions resulted from the coactions of geologic structures and marine hydrodynamic conditions since the Holocene. The geologic structures controlled the slope deposit, proluvial and fluvial fillings since the late Pleistocene. Holocene marine hydrodynamics eroded away sediments at the bay mouth, and tides carried these eroded materials to the sides of the bay mouth and released them there, forming channel-ridge-alternating geomorphic features. During transgressive processes, the sea level rose rapidly, and insufficient sediment supply and tidal actions yielded the relict sediments in the east of Qingdao offshore area. © 2011 Science Press, Ocean University of China and Springer-Verlag Berlin Heidelberg.