PALYNOEVENTS SINCE LATE CENOZOIC IN WEIHE VALLEY AND CLIMATE CHANGES

TONG Guo-bang; WU Xi-hao; CHEN Yun; ZHANG Jun-pai; WANG Shu-bing; LI Yue-cong; CAO Jia-dong

2000 Vol. 6, No. 4

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TONG Guo-bang, WU Xi-hao, CHEN Yun, ZHANG Jun-pai, WANG Shu-bing, LI Yue-cong, CAO Jia-dong. 2000. PALYNOEVENTS SINCE LATE CENOZOIC IN WEIHE VALLEY AND CLIMATE CHANGES. Journal of Geomechanics, 6(4): 11-18.

Citation:

TONG Guo-bang, WU Xi-hao, CHEN Yun, ZHANG Jun-pai, WANG Shu-bing, LI Yue-cong, CAO Jia-dong. 2000. PALYNOEVENTS SINCE LATE CENOZOIC IN WEIHE VALLEY AND CLIMATE CHANGES. Journal of Geomechanics, 6(4): 11-18.

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

Received Date: 07 October 2000

Abstract

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