摘要
南黄海海州湾外侧海底残留砂中分布着大量的钙质结核,我们通过对钙质结核多方面的研究,基本查清其分布规律、形态特征、物质组成、结构构造。并证明钙质结核为晚更新世晚玉木冰期海退时,海底逐渐成陆后,在较寒冷干燥的气候条件下,由地表淡水渗透淋溶及毛细管作用而形成。冰后期海进过程中,再由海水不断侵蚀作用而裸露海底,并逐渐被海水所淹没。因此钙质结核应属陆相蒸发岩类,其形成时间大约距今25000～15000年之间。
By the investigations of the sea floor geomorphology and sediment, carried out by the Shanghai Bureau of Marine Geological Survey in the western part of the Southern Yellow Sea in recent years, large amounts of calcareous concretions have been found in the wide sea area, south of Qingdao and outside the Haizhou Bay. They are characterized by wide distribution, high enrichment, and large size of individual concretions. Based on the analyses, identifications, and studies of these calcareous concretions, their distribution pattern, morphological characteristics, composition, texture and structure are described and their origin is discussed in this paper strong evidence shows that these calcareous concretions are terrestrial evaporates formed by infiltration and leaching processes of surface water in a terresttrial environment with relative cold and dry climate during the regression of Late Tali(Würm) glaciation in Late-Pleistocene(about 25000-15000 years age). They were submerged by sea water during the post-glacial transgression.
