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本文根据~(14)C测年、岩性、生物和化学等方面资料,把东海陆架残留沉积分为两种成因类型和四个沉积阶段,上部残留沉积物年代普遍小于距今1.5万年,沉积物年龄由东向西逐渐变晚,为冰后期海进时波浪对早期沉积物进行改造后,沉积在滨岸、演海环境的一套海相砂质沉积物,属海进成因,下部残留沉积物年代大干距今1.5万年,由西向东年代变新,为晚更新世末冰期海退沉积成因,由于二者在成因上有较明显的不同,因此,上部为“海进改造沉积”,下部为“海退残留沉积”,以予区别。
Based on the dating of ~ (14) C, lithology, biology and chemistry, this paper divides the sediments of the East China Sea shelf into two types and four depositional stages. The age of the upper residual sediments is generally less than 15,000 years ago, The age of sediments gradually becomes late from east to west. It is a set of marine sandy sediments deposited on the coast of the coastal area and the seaward environment after the early-glacial sea-time waves transformed the early sediments. Since the age of the remnant sediments was 15,000 years from now to the present, the new sediment changed from west to east in the Late Pleistocene. Because of the obvious difference in genesis between the two sediments, the upper part is “ Deposition ”, the lower part of“ returnees residual deposits ”to be distinguished.