在南海北部大陆架水深约60m以外的外陆架及其外缘,广泛分布着浅灰色或灰黄色以细砂为主的残留砂.前人研究认为,它们是更新世冰期的滨海沉积物.最近,笔者通过对残留砂石英颗粒表面特征的扫描电镜分析,对其成因提出了新认识. In the outer shelf of the continental shelf at a depth of about 60 m in the northern South China Sea and its outer margin, fine grained sandstone-based residual sands are widely distributed, and they were considered to be coastal sediments during the Pleistocene Ice Age, By analyzing the surface features of the residual sand quartz particles by scanning electron microscopy, the author put forward a new understanding of the causes.