【摘要】 黑龙江嘉荫地区是在我国范围内最有希望找到确切陆相白垩系—古近系界线的地区之一 ,定量研究界线附近古气候变迁有助于了解该界线前后的生物灭绝与复苏过程。本文以乌云组含煤段第 10层所产 2 0属 2 9种木本双子叶被子植物化石为根据 ,定量研究了嘉荫地区白垩系—古近系界线之后的生物复苏的环境条件。“叶相—气候多变量程序”定量分析结果显示 ,该区古近纪早期年均温度 (MAT)约 11.4 5℃ ,属暖温带气候类型 ;“叶缘分析”得出年均降水量 (MAP)约为 14 2 4 m m ,林相总体上属混交中生林更多还原

【Abstract】 The Jiayin area, lying along the Heilongjiang River, is one of the promising areas to find a non-marine Cretaceous—Paleogene boundary in China. This paper focuses on a paleoenvironmental study with the foliar physiognomy analysis of 20 genera and 29 species of woody dicots leaf fossils, which were collected from Bed 10 of the coal-bearing member of the Wuyun Formation in this area aged at the Early Paleogene. Most of them are quantified with the Analysis Multivariate Program (CLAMP) and analyzed by using the Canonical Correspondence Analysis (CCA). The data used in the methods indicate that the mean annual temperature (MAT) of this area is estimated as 11.45℃ in the Late Danian (Early Paleogene), and the Jiayin area belonged to a warm-temperate climate type in the Early Tertiary. The leaf margin analysis shows that the mean annual precipitation (MAP) was 1424 mm, and the forest composed of the flora from the coal-bearing member of the Wuyun Formaiton belongs to the mixed Mesophytic.更多还原