【摘要】 <正> 第四纪以来,地球上气候出现冰期一间冰期变化,其周期为10万年左右.这种变化在深海有孔虫介壳氧同位素比值变化和陆地上黄土一古土壤剖面上均有反映.氧同位素变化同时也反映了与气候变化相应的大洋水体积或大陆上冰量的变化.大陆上冰量和极地冰量的变化引起了全球性的海面升降运动,它对我国海岸和大陆架影响极其深远,它影响着海岸和大陆架的发育以及沉积特征.晚第四纪以来,我国陆地上的海相层基本上可以和世界相对高海面相对应.但在早第四纪,海侵层和相对高海面并没有必然的联系,同时海侵事件的次数比深海氧同位素曲线的旋回次数要少,时间上规律性不明显.随着年代的变新,各海侵事件之间的时间间隔缩短.这揭示了我国第四纪海侵事件序列和新构造运动和地貌发展过程有十分紧密的联系,也可能与地球冰期旋回和海面升降运动的频率和幅度变化有关.为了强调地貌形成过程在第四纪发展史上的重要性和它与新构造运动的密切关系,作者曾建议使用“地貌运动”(Morphogenetic movement)一词.我国第四纪地貌运动、海面相对升降运动和气候环境变化三者之间互相联系,互相影响,共同决定着东部大陆的发育和沉积特征.所以当我们研究任何一方面的影响(无论是海面升降运动、气候变化还是新构造运动)都应考虑到另外两方面的?更多还原

【Abstract】 In recent years, hundreds of cores have been taken from the coastal plains of North and East China and multiple study of biostratigraphy, magnetostra-tigraphy and chronostratigraphy has been devoted to reveal the close relation between climatic and sea level fluctuation. The present paper deals with the complicated relationship between sea level fluctuation, buried marine sediments, morphotectonics and evolution of coastal plains. Based on the studies of foraminiferal fauna and sedimentary facies, eight to ten Quarternary transgre-ssions have been recognized at different depths in the North China Plain, In the Bohai Gulf siz marine horizons, which could be correlated with the eustatic high stands of sea level have developed since the late Pleistocene. In the early Pleistocene, however, violent neotectonic movement made the paleoenvironment differences in North and northwestern China. As a result, the sea transgressed far inland through faulted fractures or rift vallays. Moreover, the time intervals between every two successive marine horizons in the late Quaterary are much shorter. This may be due to the increasing amplitudes of late Pleistocene sea level fluctuations that are closely related to the amplitudes of glacial cycles.Because the coastline of China spans different geotectonic units, the activities and Characteristics of tectonic movements have been remarkably different from one another. In this paper, more attention has been paid to the regional difference of Quaternary sea-level curves and dynamic stratigraphy. The purposes of this paper are (1) to correlate the deeply buried marine deposits of the downsinking North China Plain with the sea-level events of uplifted and well-dated coral reefs in other regions such as in Barbedes and New Guinea; (2) to correlate with the Oxygenisotopic stages recorded in deep-sea cores and (3) to correlate with the paleosols in the loess deposits in northwestern China. The following problems have also been discussed. (1) the factors that have controlled the formation of cheniers and (2) the causes of the variation of rate of coastal progradation in North and East China.更多还原