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中、美于1980年开始进行的“长江口—东海陆架海洋沉积作用过程”联合研究外业工作于1981年12月正式结束.我们地质矿产部海洋地质研究所前后共有4名同志参加了这一工作.通过外业调查和室内资料分析,再参照前人的工作成果,我们有下面几点初步认识:一、长江南京河段、长江口、东海陆架的沉积物,其粘土矿物是以伊利石为主的伊利石-绿泥石-高岭石矿物组合为其共同特征.重矿物也具有闪石-帘石-金属矿物-榍石-柘榴石的相似组合.以及在东海陆架上发现有不同时期新老长江三角洲的叠置现象和古河道的遗迹,都充分说明,长江输出物质(4.86亿吨/年)对长江口门地段沉积作用的控制作用是十分明显的.同时也说明,长江水下新老三角洲的形成和演变和东海陆架的形成、发展也有着十分密切的关系.
The joint research field operation of the “Yangtze Estuary - East China Sea Shelf Ocean Sedimentation Process” started by China and the United States in 1980 formally ended in December 1981. A total of 4 comrades, before and after the Institute of Marine Geology, Ministry of Geology and Mineral Resources, participated in this Work.Through field surveys and indoor data analysis, and then refer to the work of predecessors, we have the following preliminary understanding: First, the Nanjing Yangtze River, Yangtze River estuary, the East China Sea shelf sediments, the clay minerals based on illite Based illite-chlorite-kaolinite assemblages are common features, heavy minerals also have similar assemblages of amphibole-curtain stone-metallobite-garnet-garnet, and they are found on the East China Sea shelf The superposition of old and new Yangtze River delta and the ruins of the ancient rivers all fully demonstrate that the controlled role of the Yangtze River’s output of materials (486 million tons / year) on the sedimentation of the Changjiangkou Gate section is very clear. It also shows that the Yangtze River water The formation and evolution of the new and old delta under the sea and the formation and development of the East China Sea shelf are also very closely related.