吉林省松辽盆地东缘晚期中生代植物群及其古生态研究

RESEARCH ON DATE MESOZOIC FLORAS AND ITS PALEOECOLOGY ON THE EAST MARGIN OF SONGLIAO BASIN, JILIN PROVINCE

本文在系统研究吉中地区晚期中生代植物群的基础上,论述了沙河子组和大羊革沟组植物群的演替,分析了化石植物群的保存特点及其沉积环境。应用现代植物生态学的原理和方法,依据现实主义类比原则,分析了植物群的古气候意义,认为本区晚中生代由温暖、潮温的温带型气候转变为温热、湿润的暖温带型气候条件。根据植物群的组成和性质特征,认为本区晚中生代植物地理区应属瓦赫拉梅耶夫(1988)划分的西伯利亚—加拿大植物地理区范畴。

Based on a systematic study of late Mesozoic floras on the east margin of Songliao Basin, Jilin province, in this paper, evolution of the floras in the Shahezi Formation and Dayangcagou. Formation is discussed, and the preserve features and its depositionat environment of fossil plants are analysed. By applying the principle and method of modern phytoecology, and by passing analogy, paleoclimate of this floras is analysed. It is considered that the climate of late Mesozoic became warm and damp gradually in this area. According to the characteristics of the floras and its formation, this area should be referred to Sibria-Canadian.