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SEDIMENTATION IN THE ZHOUSHAN COASTAL ZONE AND TRANSGRESSION-REGRESSION OF THE CHANGJIANG DELTA

QIAN LIPING,LI YULIANG,ZHU ZIMIN and CAI WEIQING(Institute of Marine Geology. Tongji University)  
When the postglacial transgression of the Holocene Epoch was at its period of full bloom 7,500 years ago,the Changjiang River mouth receded inland,thus forming an estuary in the shape of a horn with Zhenjiang and Yangzhou located at its tips.This made it impossible for the silt of the Changjiang River to reach and affect the coastal areas of Zhejiang and Fujian.During this period,the Zhoushan Archipelago suffered serious erosion,which developed a wide sea-eroded landform.Later,a gradual decrease in the uplift rate of sea level led to a rapid growth of the current Changjiang River delta and gradual southward shift of the Changjiang River mouth.The littoral current carried a large amount of silt southward,and the erosion of the coastal zone of the Zhoushan area came to a stop.A great deal of marine ooze lay directly on top of the sea-eroded landform and the marine sand-gravel bed,thus bringing about a sudden change in sedimentary facies.With the constant supply of the silt from the Changjinag River and the continuous uplifting of this area,a large area of mud beach was formed,and a coastal zone of the erosion-accumulation type widely developed.This gives rise to the possibility of the islands being joined up by mudbank.
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