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Acta Seismologica Sinica

, Volume 9, Issue 2, pp 255–260 | Cite as

Upper mantle flow beneath the Northwest of China and its lithospheric dynamics

  • Jian-Hua Huang
  • Xiao-Hua Chang
  • Rong-Shan Fu
Article
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Abstract

The regional isostatic gravity anomalies in the Northwest of China (80°–95°E, 35°–45°N) and corresponding problems of mantle dynamics are discussed in detail in this paper. It is assumed that the anomaly of isostatic gravity in this region is caused by the nonuniformity in density and that the boundary deformation is related to the thermal convection in the upper mantle. Using the correlation equation between the mantle flow and regional anomalies of isostatic gravity as a constraint, we have calculated the patterns of upper mantle convection. The result shows that the regional lithospheric tectonics is strongly correlated with the upper mantle flow. The uplift of the Tianshan and Kunlun Mountains corresponds to the upward flows in the mantle while the depression of the Tarim, Turpan and Junggar Basins corresponds to the downward flow. Meanwhile, we have also worked out a basic framework for the lithospheric dynamics of the Northwest of China. It is reasonable to infer that the mantle flow and the horizontal compression from the India plate may act as the main driving forces for the lithospheric tectonics of this region.

Key words

upper mantle lithospheric dynamics thermal convection 

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References

  1. Ding, G. Y.et al., 1991. Introduction of the Lithospheric Geodynamics of China, Beijing: Seismological Press 600pp. (in Chinese).Google Scholar
  2. Fu, R. S., Huang, J. H., and Liu, W. Z., 1994a. Correlation equation between regional isostatic gravity anomalies and small scale mantle convection.Acta Geophysica Sinica,37(5): 638–646 (in Chinese).Google Scholar
  3. Fu, R. S., Chang, X. H. and Huang, J. H.et al., 1994b. Small scale convection in the upper mantle constrained on the regional isostatic gravity anomalies.Acta Geophysica Sinica,37 (Suppl. I): 249–258 (in Chinese).Google Scholar
  4. Ma, X. Y., 1990.Lithospheric Geodynamics ATCAL of China. Beijing: China Map Press, 288pp. (in Chinese).Google Scholar
  5. Molnar, P., Engliand, P. and Martinod, J. 1993. Mantle dynamics, uplift of Tibetan Plateau and Indian Monsson.Rev. Geophys.,31: 395–396.CrossRefGoogle Scholar
  6. Molnar, P. and Tapponnier, P., 1978. Active tectonic of Tibet,J. Geophys. Res.,83: 5361–5375.CrossRefGoogle Scholar
  7. Turcotte, D. L. and Schubert, G., 1982.Geodynamics — Application of Continuum Physics to Geological Problems. John Wiley and Sons.Google Scholar
  8. Zhang, Z. M., 1982.Tectonic Structure of Oil Deposits in China. Beijing: Oil industry press (in Chinese).Google Scholar

Copyright information

© Acta Seismologica Sinica 1996

Authors and Affiliations

  • Jian-Hua Huang
    • 1
    • 2
  • Xiao-Hua Chang
    • 1
    • 2
  • Rong-Shan Fu
    • 1
    • 2
  1. 1.Department of Earth and Space SciencesUniversity of Science and Technology of ChinaHefeiChina
  2. 2.Advanced Centre for Earth Sciences and AstronomyUniversity of Science and Technology of China, Third World Academy of ScienceHefeiChina

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