摘要
本文综合研究了松辽盆地白垩纪古气候的沉积记录、孢份古植物群记录及碳、氧同位素地球化学特征，得出了松辽盆地白垩纪古气候的演变规律。并认为碳族国与古气候旋回有密切的对应关系，大气中ＣＯ＿２含量的变化是古气候变化的根本原因。每一温暖时期的开始都与大气中ＣＯ＿２含量的增加有关，随着固碳作用的增强，温室效应削弱。碳旋回是古气候变化的重要机制。
This paper deals synthetically with sedimentary records, sporopllen and palaeofloralrecords, geochemical properties of carbon and oxygen isotopes and the evolution of thepalaeoclimates in the Songliao Basin during the Cretaceous. The carbon cycles are believedto be closely correlated with the palaeoclimatic cycles,and the variations in carbon dioxidecontents in the atmosphere are responsible for the changes in the palaeoclimates. The innation of each warm period is always accompanied with the increase in carbon dioxide co.ntents. The greenhouse effect tends to decrease as the carbon fixation increases. It is concluded that the carbon cycles are the important mechanism for the palaeoclimatic changes.
基金
本文为国家教委博士点基金
关键词
松辽盆地
白垩纪
古气候特征
变化机制
Songliao Basin
Cretaceous
palaeoclimatic characteristics
mechanism forthe climatic changes
