黄海晚更新世的黄土沉积

根据８０年代在黄海多次综合性地调查资料，对采获样品进行粒度，矿物，化学成分等分析和对比。结果证明，黄海在２－３万年前的晚更新世低海面时，同今日的陆地一样，曾存在着黄土沉积，尽管全新世大规模海侵发生之后，黄土沉积受到了一定的破坏和改造，但它们仍大量地残留在黄海西部的海底，其中又以海州湾一带的分布面积最大，由于长期处于海底，已发生了某种程度的变化，但其基本性质和特征仍同陆上的黄土相似。

LOESS DEPOSIT IN YELLOW SEA DURING LATE PLEISTOCENE

Loess is a typical Quaternary deposit on land in northen China, but existed inthe Yellow Sea in late Pleistocene as surveys in the 1980s recovered its remains onthe seafloor. Priliminary study on grain size, mineral content and chemical compo-nent shows that typical loess on the seafloor distributes over a large area in HaizhouBay between Qingdao and Lianyungang and is usually found under modern sedimentand relict sediment and some even emerges from the seafloor surface. The loess onthe seafloor is composed mainly of silt and clay fractions. Its major chemical compo-sitions and some trace elements are similar to those of Malan loess on the Chinamainland. The radiated structure, and composition of calcareous nodules in loesson the seafloor and that on land are also similar. 14C dating proved that the sea-floor loess was formed in 18 000-23 000a B. P. on land. Since the loess had beenunder the seafloor for a long time, some changes have occurred in it.