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《Journal of Geodesy and Geodynamics》 2009-01
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Shan Bin1,2),Fu Rongshan3) and Zheng Yong4)1) Institute of Geodesy and Geophysics,CAS,Wuhan4300772) Graduate School of Chinese Academy of Science,Beijing1000493) School of Earth and Space Science,University of Science and Technology of China,Hefei2300264) Institute of Geophysics,CEA,Beijing100081  
This paper simulated the pattern of mantle convection and its evolution process under the driven force from modern plate tectonic motion based on a 3-D mantle convection model and then analyzed the mantle mixture effect further.The results show four main characteritics of mantle mixture: 1) Degree of mantle mixture is mainly controlled by tectonic driven forces.2) The degree of material mixture in the upper mantle is higher than that in the lower mantle.About 80% elements in the upper mantle and 60% in the lower mantle have been past through by at least two curves.3) The degree of mantle mixture also depends on the convection time.The longer the time,the higher the degree of mixture,but the trend of mixture increase is getting downward,that makes the existence of mantle heterogeneities under the full mantle convection environment possible.4) Mantle convection type can affect the mantle mixture in quite a deal.The existence of toroidal convections can make the material travel much longer distance than spheroidal convections,thus increase the mixture effect efficaciously.
【Fund】: 国家自然科学基金(40774053);; 中国科学院知识创新重点方向性项目(KZCX3-SW-153)
【CateGory Index】: P542.5
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