江汉盆地始新世中、晚期古气候定量重建初探

童国榜; 刘志明; 郑绵平; 袁鹤然; 刘俊英; 王伟铭; 李月丛

Volume 27 Issue 4

Jul. 2002

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Article Navigation > Earth Science > 2002 > 27(4): 446-452

TONG Guo-bang, LIU Zhi-ming, ZHENG Mian-ping, YUAN He-ran, LIU Jun-ying, WANG Wei-ming, LI Yue-cong, 2002. Primary Study on Quantitative Reconstruction of Middle-Late Eocene Climate in Jianghan Basin. Earth Science, 27(4): 446-452.

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Primary Study on Quantitative Reconstruction of Middle-Late Eocene Climate in Jianghan Basin

1.
Institute of Hydrogeology and Environment Geology, Chinese Academy of Geological Sciences, Zhengding 508103, China
2.
Open Laboratory of Saline Lake Resources and Environment, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Institute of Mineral and Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
R & D Center of Saline Lake and Epithermal Deposit, Chinese Academy of Geological Sciences, Beijing 100037, China
5.
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
6.
Institute of Hebei Cultural Relics, Shijiazhuang 050031, China

Received Date: 2002-03-27
Publish Date: 2002-07-25

Abstract

Abstract

This paper reports our primary effort in quantitatively reconstructing paleoclimate based on the niche of the affinity parent plants in the stratigraphic pollen record. Eocene pollen data come from our former study on the core Mingjia 1 in the Jianghan basin. The changing trend in the parameter curve of climate shows that the middle Eocene climate in the Jianghan basin is more or less comparable with that of the present 22°-26°N, reflecting a humid, semi humid central southern subtropical climate. The annual temperature then declined 1-4 ℃ lower at the late Eocene, approximately equal to the present 23°-28°N of northern central subtropical climate. However, the climate composite at that time was different from the present one, and was characterized by higher temperature, small annual range, and big fluctuation in precipitation. The January average temperature in the middle Eocene was 5-9 ℃ higher than that of today, indicating that there was no winter monsoon influence in the middle Eocene, though it may have partly happened in late Eocene. Major temperature decline is recognized at depth 2 100 m of the core, as was indicated by the decline in January average temperature and an increase in annual range. It is also indicated by the increase of the deciduous broad leaved types in the pollen assemblage. The sharp fluctuation in the annual precipitation, raging from 300 to 1 700 mm, was favorable for the migration and accumulation of salty deposits. When the precipitation was lower than 1 000 mm, ephedra shrub increased, which happened in the same depth with the salty deposit. It is deduced that the dry and hot environment in the high mountain and deep basin could have been the main reason for the formation of the salty deposit in the core. The annual precipitation was not very lower at that time, and this is different from the present salty deposit in Northwest China.
- Quantitative reconstruction of paleoclimate,
- annual range,
- niche function,
- fuzzy mathematics,
- Eocene,
- Jianghan basin

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References(20)

References

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