南海北部大陆架残留风成沙与海岸带古风成沙的对比及关系研究

 广泛分布于南海北部大陆架的残留风成沙,在形态、粒度、石英沙粒表面微结构、矿物组成及浅地层剖面等方面总体上具备风成沉积特征。同时,南海北部沙质海岸多处发育的晚更新世古风成沙,在粒度、沉积构造与结构等方面亦有明显的风成沉积特征。二者构成的风沙地貌体发育具有同期性、形态有相似性、空间分布有大陆架向海岸带延伸的连续性。由此表明,南海北部大陆架与毗邻沙质海岸的沙源有同源性,沉积环境有类比性。据此可以认为,南海北部大陆架残留风成沙与海岸带古风成沙为近源沉积成因系列,二者为同期同相连续性沉积。

Comparison between Continental Shelf Aeolian Residues and Coastal Palaeo Aeolian Sediments in Northern South China Sea

There are residual Aeolian sediments on the shelf in the northern part of South China Sea, and their sand morphology, mineral composition, grain size, quartz grain surface texture features and subbottom profile all have the typical characteristics of eolian deposition. There are a number of sandy coasts developed in the Last Glacial Maximum Holocene in northern South China Sea, and their grain size, sedimentary structures and sedimentary structural features also have obvious characteristics of eolian deposition. Comparison study shows that the landform developments of the both were in same period and in similar pattern, and the distribution of Aeolian sediments had continuity in space from the shelf to the coast. It can be considered that these two Aeolian sediments are developed from approximate deposition causes, besides, belong to spatially continuous deposits in same period.