【摘要】 本文用热释光测年和地球化学标志法研究了莱州湾地区沉积环境的变化。石英的375℃热释光峰作为测年基础。岩芯样品的测定结果、反映了自全新世（1.2万年）至晚更新世（11万年）地层的年代特点。实验中来用了Sr/Ba、Rb、Mn/Fe和CaO作为地球化学标志,所得数据经Sheppard方程和Fisher判别处理。在得到的沉积环境变化曲线和大洋δ¹⁸O曲线对比中可以看出,本区在十万年以来出现过三次海陆相地层变化序列,其中在距今11—7万年和深度为43.5—60m处,在距今4.6—2.1万年和深度为23—35m处,以及在距今1.1—0.6万年和深度为8—11m处出现过三次海相地层,分别与沧州、献县和黄骅海侵事件相应,并同时受到全球气候变化的控制。更多还原

【Abstract】 The Laizhou Bay is located in the south of the Bohai Sea. The coastal plainof the Laizhou Bay is covered with Quaternary sediments. The largest thickness（over 360 m） of the sediments is found near. Yangkou and in the north part ofWeifang. The core samples were taken from the saltern of Yangkou. The dating of the samples by the thermoluminescence method indicates thatthe strata at depths of 3.8--60 m record the variation of the sedimental environ-ments during the past 0.11 Ma. Then the samples were analysed for the ratiosof Sr/Ba and Mn/Fe and the contents of Rb and CaO; all of the data were trea-ted by the Sheppard and Fisher methods.The final equation for discriminatingbetween the strata of the continental and marine facies is shown as follows:R = 2. 08[Y_i （Sr/Ba）] + 0. 44[Y_i （Rb）] + 651[Y_i （Mn/Fe）] - 1. 26[Y_i （CaO）].Based on the R values and the depth of the strata, the curve of variation of thesedimental environments of the strata has been drawn. In comparison with theoceanic δ¹⁸O curve, the following conclusions may be drawn: （1） the first marinebed occurred at depths of 43.5--60 m during, 110--70 Ka B. P.;（2） the continen-tal bed occurred at depths of 35--43.5 m during 70--46Ka B. P. ; （3） the secondmarine bed appeared at 23--35 m during 46--21 Ka B. P.; （4） the continentalbed appeared agained at 11--23 m during 21--11 Ka B. P.; （5） the thirdmarine bed appeared at 8--11 m during 11--6.3 Ka B. P.; （6） modern littoralseriments occur above a depth of 8 m since 6 Ka B. P. The three marine bedswere related to the Cangzhou, Xianxian and Huanghua transgression events.更多还原