渭河谷地晚新生代地表环境巨变的孢粉记录

基金项目:

原地质矿产部重点项目(950113)，中国科学院湖泊沉积与环境研究开放实验室资助项目

PALYNOEVENTS SINCE LATE CENOZOIC IN WEIHE VALLEY AND CLIMATE CHANGES

1. Institute of Geomechanics, CAGS, Beijing 100081, China;
2. Institute of Geomechanics, CAGS, Beijing 100081, China;
3. Open Laboratory of Lake Sediment and Environment, Chinese Academy of Sciences, Nanjing 210008, China;
4. Open Laboratory of Lake Sediment and Environment, Chinese Academy of Sciences, Nanjing 210008, China;
5. State Key Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences, Xi'an 710054, China

摘要: 本文在总结渭河谷地20多个孢粉剖面的基础上,依据古地磁资料确定其时代,并在空间和时间上进行孢粉组合对比,从而建立了10个区域孢粉组合带。由此提出3.5MaBP以来孢粉植物群的演化经历了5个阶段:由阔叶林-针叶林-森林草原与草原-森林草原与荒漠草原-草原-森林草原与草原。这5个阶段标志着地表环境系统发生巨大变革,变革时间为2.5MaBP,2.0MaBP,1.4/1.6MaBP和0.8MaBP.
- 渭河谷地 /
- 晚新生代 /
- 地表环境巨变 /
- 孢粉植物群
Abstract: Weihe valley is one of the areas where the study on late Cenozoic palynology began very early,involving more than twenty sections. By comparing the temporal and spatial distribution of the sporollon assemblages coupled with paleo-geomagnetism dating,we have ten areal zones. Since 3.5MaBP,the palynoflora were found to have evolved go through five stages,i.e.broad-leaf trees stage,conifer trees stage,woody grassland and grassland stage,woody grassland and desert grassland stage,grassland stage,and lastly woody grassland and grassland. These stages mark the megaevolution of the surface's environments beginning respectively from 2.5MaBP,2.0MaBP,1.4/1.6MaBP,and 0.8MaBP.
- Weihe valley /
- late Cenozoic /
- surface's environment megaevolution /
- palynoflora