云南开远小龙潭盆地晚第三纪孢粉植物群  

A PALYNOLOGICAL SURVEY OF NEOGENE STRATA IN XIAOLONGTAN BASIN, YUNNAN PROVINCE OF SOUTH CHINA

作　　者：王伟铭[1] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008

出　　处：《Acta Botanica Sinica》1996年第9期743-748,共6页Acta Botanica Sinica（植物学报：英文版）

基　　金：中国科学院南京地质古生物研究所所长基金

摘　　要：对云南开远小龙潭盆地上第三系各层位孢粉研究表明∶被子植物在盆地沉积时期始终居优势地位，且类型丰富，以常绿阔叶树种为主．草本植物花粉在盆地的上部层位含量有所增加，出现多种菊科类型，而部分被子植物花粉的含量消减或消失． 据此划出两个孢粉亚带，其中Ａ 亚带的地质时代可能是中新世中晚期。A palynological investigation of 24 samples from the representative Neogene strata of the Xiaolongtan Basin (23°48′N, 103°11′E) were novelly carried out. Pollen samples were collected from the strata of N 1 (clay, sandstone and conglomerate), N 2(clay intercalated with thin bedded lignite at the lower part, and coal bed at the upper part), N 3(marl), and N 4(clay intercalated with thin bedded lignite) in ascending order respectively. Pollen flora was characterized by the predominant appearance of angiospermous elements, representing the parent plants of evergreen broad leafed types. Variations in the pollen flora were recognized between sample 15 and 16, as more herbaceous pollen of the Compositae types increasing upward in the strata, while certain woody types were minimized or even disappeared, thus dividing the pollen flora into two subzones. According to the current study, the geological age of the flora was suggested to be Middle Late Miocene (Subzone A) to Early Pliocene (Subzone B), and the inferred vegetational type was evergreen broad leafed forest, accompanied by a few deciduous elements.

关 键 词：孢粉植物群 晚第三纪 小龙潭盆地 微体古植物 

分 类 号：Q913.84[天文地球—古生物学与地层学]