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Science in China Series D: Earth Sciences

, Volume 44, Supplement 1, pp 227–232 | Cite as

Pleistocene magnetic susceptibility and paleomagnetism of the Tibetan loess and its implications on large climatic change events

  • Yan Maodu 
  • Fang Xiaomin 
  • Chen Shiyue 
  • Yang Shengli 
  • Lü Lianqing 
  • Li Jijun 
  • An Zhisheng 
Article

Abstract

Ganzi loess represents the oldest Tibetan loess, its formation is the key to determining the readjustment of Tibetan atmospheric circulation and the relationship between Tibetan uplift and global climatic change. Detailed magnetostratigraphic study shows that the Ganzi loess was formed at about 1.13 MaBP. It also reveals that there are two notable climatic events occurring in 0.95–0.92 Ma and 0.65–0.5 Ma respectively. The both demonstrate that the Tibetan atmospheric circulation was readjusted and the Tibetan Plateau entered the cryosphere at 21.13 Ma, and the Tibetan glaciation might reach its maximum at ∼0.65–0.5 Ma.

Keywords

Tibetan Plateau Ioess uplift atmospheric circulation climatic change 

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References

  1. 1.
    Li Jijun, Fang Xiaomin, Tibetan uplift and environmental change study. Sci. in China. Ser. B (in Chinese), 1998, 43: 1568–1574.Google Scholar
  2. 2.
    Fang, X. M., Li, J. J., Van der Voo, R., Rock magnetic and grain size evidence for intensified Asian atmospheric circulation since 800,000 years BP related to Tibetan uplift, Earth Planet Sci. Lett., 1998, 149: 121–127.Google Scholar
  3. 3.
    Berger, W. H., The central mystery of the Quaternary ice age, Oceanus, 1993, 36: 53–56.Google Scholar
  4. 4.
    Ruddiman, W. F., Raymo, M. E., Martinson, D. G. et al., Pleistocene evolution: northern hemisphere ice sheets and north Atlantic Ocean, Paleocenaogr., 1989, 4: 353–412.CrossRefGoogle Scholar
  5. 5.
    Liu, D. S., Zhen, B. X., Li, S. J. et al., The maximum glacial age, height and climatic environment research East-center Tibetan Plateau, J. Glaciology and Geocryology, 1995, 17(2): 97–112.Google Scholar
  6. 6.
    Liu Dongshen, Loess and Environment (in Chinese), Beijing Science Press, 1985.Google Scholar
  7. 7.
    Fang, X. M., The origin and Provenance of Malan loess along eastern margin of Qinghai-Xizang (Tibetan) Plateau and its adjacent area, Sci. in China, Ser. B, 1995, 38: 876–887.Google Scholar
  8. 8.
    Chen, F. B., Gao, S. W., Chen, J. L. et al., The extensive magnetic stratigraphy study in Ganzi loess section, Chinese Science Bulletin (in Chinese), 1990, 35(20): 1600.Google Scholar
  9. 9.
    Fang, X. M., Chen, F. B., Liu, D. S. et al., The evolution of Ganzi loess and Tibetan Frozen zone, Sci. in China, Ser. B (in Chinese), 1996, 41(20): 1865.Google Scholar
  10. 10.
    Jiang, F. C., Wu, X. H., Xiao, H. G. et al., Ganzi loess stratigraphy study in Chuanxi Plateau, Geography Lett. (in Chinese), 1997, 18(4): 413–420.Google Scholar
  11. 11.
    Cabde, S. C., Kent, D. V., Revised calibration of geomagnetic polarity timescale for the late Cretaceous and Cenozoic, J. Geographys. Res., 1995, 100: 6093–6095.Google Scholar
  12. 12.
    Li Jijun, Glacial in Hengduan Mountain (in Chinese), Beijing: Science Press, 1996, 157–190.Google Scholar
  13. 13.
    Trenberth, K. E., Chen, S.-C., Planetary waves kinematically forced by Himalayan Origraphy, J. Atmos. Sci., 1988, 45: 2943–2948.Google Scholar
  14. 14.
    Shackleton, N. J., Berger, A., Peltler, W. R., An alternative astronomical calibration of the lower Pleistocene time scale based on ODP site 677, Phil. Trans. Roy. Soc. Edinb., 1990, 81: 251–261.Google Scholar

Copyright information

© Science in China Press 2001

Authors and Affiliations

  • Yan Maodu 
    • 1
  • Fang Xiaomin 
    • 1
    • 2
  • Chen Shiyue 
    • 1
  • Yang Shengli 
    • 1
  • Lü Lianqing 
    • 1
  • Li Jijun 
    • 1
  • An Zhisheng 
    • 2
  1. 1.MOE National Laboratory of Western China’s Environmental Systems & Department GeographyLanzhou UniversityLanzhouChina
  2. 2.State Key Laboratory of Loess and Quaternary GeologyInstitute of Earth Environment of Chinese Academy of SciencesXi’anChina

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