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晚更新世末期(12000—25000a BP)为玉木冰期最盛时期,气候寒冷而干燥,极地冰流的扩展使世界海面大幅度下降,我国东部沿海海面下降约130—160m,黄海、东海陆架裸露成陆。在寒冷干燥的气候条件下,陆架沉积物不仅受到强烈的机械风化作用,而且受到来自北方强大于冷气流的吹扬作用,陆架沉积物在这些外力因素的作用下破坏解体,形成一系列的风沙地貌和风沙沉积,反映出晚更新世末期南黄海陆架沙漠化景观。根据本区浅地层测量断面分析研究的结果,并结合柱状岩芯及钻孔资料,初步揭示了本地区晚更新世末期的古地貌特征。
The late Pleistocene (12000-25000a BP) is the peak of the Tamaki ice age. The climate is cold and dry. The expansion of the polar ice flow drastically reduced the world’s sea surface. The sea surface of the eastern coast of China landed about 130-160m, while the shelf of the Yellow Sea and East China Sea bare ground . Under cold and dry climatic conditions, the continental shelf sediments are not only subjected to strong mechanical weathering but also to strong impending air currents from the north, which cause the sediments to disintegrate under the influence of these external forces to form a series of sandstorms Landform and aeolian deposition, reflecting the Late Pleistocene South Yellow Sea shelf desertification landscape. According to the results of cross-section analysis of shallow strata survey in this area and the combination of columnar core and borehole data, the paleogeomorphology of the late Pleistocene in this area was initially revealed.