Evolution of Early Pleistocene Environment in Linxia Basin , Gansu
详细信息
- 责任者：Dong Ming (College of Tourism and Geography Sciences ; Yunnan Normal University ; Kunming 650092 ; China) ; Fang Xiaomin
- 刊名：Journal of Lanzhou University (Natural Sciences)
- 出版年：2011
- 卷期：47(1)
- 关键词：早更新世 ; Lower Pleistocene ; 古环境 ; paleoenvironment ; 甘肃 ; Gansu Province
- 页码：p.1-5,11
- 图表：7 illus., 25 refs.
- 分类号：1400
- issnNo：ISSN0455-2059
- isbnNo：CN62-1075/N
摘要
Based mainly on the spore-pollen analysis, combining with w(CaCO3), c(Cl-) and grain size, the authors reconstructed a sequence of early pleistocene environmental changes in Linxia Basin. It was divided into 3 phases: arid (2.50～1.91 Ma)-wet (1.91～1.80 Ma)-arid (1.80～1.76 Ma). Especially, during 1.89～1.87 Ma, the content of Picea pollen was the highest (77.8%～89.4%), indicating the humidest period during the whole early Pleistocene. The climatic shift of early pleistocene in Linxia Basin might have occurred near 1.95 Ma, by comparing the pollen data of shrub and herb with the north Atlantic deep-sea benthic oxygen isotope curve and the south China sea oxygen isotope curves of planktonic foraminifera. According to previous research, the authors presumed that strong uplift of the Tibetan Plateau in the early Pleistocene might be one of the reasons of climate changes.
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