江南的晚更新世风成砂丘

Aeolian Dunes of the Late Pleistocene on South Bank at the Mid-lower Reaches of Yangtse River

本文主要根据长江中下游南沿地带一些主要松散砂粒组成的岗岭与丘丛的分布、物质组分与沉积构造特征及其生成时代的分析,认为它们是冰期中南侵的干冷气流,把由于海面—江面—湖面下降而大片出露的江湖滩地上的砂粒,吹扬起来又沉落的风成砂丘.

It is described that acolian dunes or sandy lands which consist of the grey-yellow sands, distributing in the south bank of the mid-lower reaches of Yangtse River, for instance, the areas near Junshan in the northern Do-ngting Lake, the area adjacent to Qingshan of Wuhan City, the area of the south bank of Yangtse River between Hukou City and Pengze City in Jian-gxi Province are the typical landscape, and the areas around the lakes in northern Poyang Lake were deposited under wind force during the last major ice age. This conclusion is summerized on the analysis of their distributions in geomorphology, sand composition and sedimentary structure as well as its forming age. These sands accumulated and formed dunes or sandy lands on the beaches during the last major ice age, owing to the reduc- tion of the sea level, water levels of river and lake in the mid-lower reaches of Yangtse River.