地理学报 ›› 1978, Vol. 33 ›› Issue (2): 142-155.doi: 10.11821/xb197802005

• 论文 • 上一篇    下一篇

云南中部晚第三纪和早第四纪的孢粉组合及其在古地理学上的意义

李文漪1, 吴细芳2   

  1. 1. 中国科学院地理研究所;
    2. 中国科学院成都地理所
  • 出版日期:1978-07-15 发布日期:1978-07-15

A PALYNOLOGICAL INVESTIGATION ON THE LATE TERTIARY AND EARLY QUARTERNARY AND ITS SIGNIFICANCE IN THE PALEO-GEOGRAPHICAL STUDY IN CENTRAL YUNNAN

Li Wen-yi1, Wu Hsi-fang 2   

  1. 1. Institute of Geography, Academia Sinica;
    2. Chengtu Institute of Geography, Academia Sinica
  • Online:1978-07-15 Published:1978-07-15

摘要: 昆明松华盆地褐煤沉积含孢粉十分丰富,对云南中部晚第三纪到早第四纪的植物群及其发展有代表意义。通过对孢粉组合的分析,我们认为本区晚第三纪以来植物群组成与当地现代的植被很相似,而与我国北方同时期的孢粉组合不同。

关键词: 晚第三纪, 云南中部, 四阶段, 古地理学, 第四纪, 第三阶段, 孢粉组合, 植物群, 褐煤, 中新世

Abstract: Based upon Palynological investigations on the late Tertiary and early Quarternary deposits found in the vicinity of kuenming, four developmental stages in vegetation in the central Yunnan are recognized. In the first stage, the sporo-pollen assemblage was mainly composed of temperate plants, Pinus, Quercus and Castanea, along with some warm temperate to subtropical elements, Podocarpus, Carya, Ilex, Aralia, etc. It reflects that the climate was rather warm. The age of this stage probably corresponds to late Miocene to Pliocene. In the second stage, Pinaceae and Pagaceae were predominant again. Some subtropical elements, Platycarya, Liquidambar, Pittosporum, Antidesma and Symplocos were distributed. It indicates that the climate became wetter and warmer . In the third stage, the amount of Pinaceae and Fagaceae decreased, while some subtropical Gymnosperms, Podocarpus, Dacrydium and Keteleeria, and subtropical broad-leaved trees, Ilex, Carya, Melia, Caesalpinia and Sterculia increased. It reflects that the climate was still warm. The second and third stages probably correspond to the Pliocene.In the final stage, the assemblage showed some changes, such as, increasing of some conifers (Abies, Picea and Cupressus), the broad-leaved trees (Alnus, Betula and Tilia) and herbs. It indicates that the climate became cooler and drier. This stage is tentatively assigned to early Quarternary.The flora reflected by the pollen assemblages is a mixed flora, Pinaceae and Fagaceae were present throughout the whole period. On the other hand, many subtropical and tropical elements, such as Ham xmenlidaceae Aquifoliaceae, Araliaceae, and Pittosporum were present too. On the whole, the flora is simillar to that of to-day in the same region. It shows that the vegetational type has not been much changed since late Tertiary.