粤东柘林湾的泥沙来源与沉积环境

柘林湾是一个小型的亚热带河口湾，海湾沉积环境的变化全都记录在沉积层序中。柘林湾沉积环境变化的主要原因是沉积物来源量的减少和水域面积的缩小。在陆相砂层之上的各海相层中均有多种海相贝壳。在海相层尤其在航道区，沉积物的粒度自下而上逐渐变细。３０年以前，韩江入海的泥沙对本海湾的沉积环境曾卢巨大的作用。本海湾东部海底的沉积物主要来自风沙入海的扩散。

The Source and Environment of Sediment in zhelin Bay of Eastern Guangdong Province

The main causes for the Sedimentary environment variation in ZhelinBay are the decreasement of the sediment source and the diminition of the water area. Thereare many marine shells in the Bay sequence above the upper transgression sand layer. Thegrain size of sediment in marine sequance becomes finner gradually from the lower layer tothe upper layer,especially in the channel area. Sediments, entering the sea from the Han-jiang River 30 years ago,have had a great effect on the sedimentary environment of the Bay. The diffusion of eolian sand into Bay is the main source for the sea-botton deposit in the east-ern sea area of the Bay.