渤海莱州湾滨海平原晚第四纪地质事件与古环境

莱州湾为渤海三大海湾之一,西面及南面均为滨海平原,是华北平原的组成部分。莱州湾滨海平原在山东低山丘陵与莱州湾之间 莱州湾滨海平原第四纪古地理环境的调查研究始于50年代,60年代以来,随着地下水资源和油气的开发,第四纪地层与沉积环境的研究开始深化。作者自70年代以来，在本区开展了第四纪地下卤水资源、海平面変化与地下咸水入侵等问题的研究，以上研究均以第四纪古地理环境为宏观背景。本文系上述研究结果的阶段总结,为今后本领域研究工作与资源开发、环境保护等方面提供了依据。

THE GEOLOGICAL EVENTS AND PALEO-ENVIRONMENT OF THE COASTAL PLAIN OF LAIZHOU BAY IN BOHAI SEA DURING LATE QUATERNARY

In the coastal plain of Laizhou Bay, the thickness of Quaternary sediments increases from the south to north and from east to west. The center of sediments is in the coastal area of the Xiaoqing River mouth. The contribution of marinebstrata is very different in the west and east, showing differences between the relief and sea level height during different stages. There were two transgressions east of the Weihe River in 40, 000 a. B P, three west of it in 100, 000 a.B P. and five in the west of Laizhou Bay in 200, 000 a. B P.. The Ostracean reefs of China in the middle Holocene were discovered for the first time in Xinhe of tbis region. This leds to the discovery of the Xinhe Paleo-coastline, high sea level in the middle Holocene and warm Paleo-marine environment so that the ancient Ostracean reefs have become the important indicators for resonstruction of the ancient coastal environment. The underground Quaternary littoral facies brine and widely distributing loess are due to the special geographical environment. Conversely, they are indicators of the environment in the ancient climate. The loess platean reflects the dry climate in this region in late Quaternary. During the cold climate period of late Pleistocene. in this region, there were forest-grassland vegetation and animal groups existing in the outer surroundings of the ice margin. This period is the important stage of the ancient environment evolution in Shandong Peninsula.