下地幔中R_(s/p)区域模型的形成机理、地震波速异常的起因和不连续界面的性质
|
摘要
从计算矿物物理学角度,较好地解释了在1000～2100km深度范围内Rs/p区域地震模型展示的异常行为,揭示了下地幔内不连续界面所处的深度存在横向变化的原因,并指明该界面具有物理界面特征.
Based on the principles of Computational mineral physics,the anomalous phenomena of the seismologically observed Rs/p regional models between 1 000 and 2 100 km depths are adequately explained. The origin of the lateral variations in the depths of the discontinuous interface in lower mantle is revealed,and the interface is shown to be characterized by the features of physical interface.
Based on the principles of Computational mineral physics,the anomalous phenomena of the seismologically observed Rs/p regional models between 1 000 and 2 100 km depths are adequately explained. The origin of the lateral variations in the depths of the discontinuous interface in lower mantle is revealed,and the interface is shown to be characterized by the features of physical interface.
引文
[1]Robertson G S,Woodhouse J H.Ratio of Relative S to P Velocity Heterogeneity in the Lower Mantle[J].J Geophys Res,1996,101:20041-20052.
[2]Oganov A R,Brodholt J P,Price G D.The Elastic Constants of MgSi O3Perovskite at Pressures and Temperatures of the Earth s Mantle[J].Nature,2001,411:934-937.
[3]Karato S I,Karki B B.Origin of Lateral Variation of Seismic Wave Velocities and Density in the Deep Mantle[J].J Geophys Res,2001,106:21771-21783.
[4]Saltzer R L,van der Hilst R D,K rason H.Comparing P and S Wave Heterogeneity in the Mantle[J].Geophys Res Lett,2001,28:1335-1338.
[5]Van de Hilst R D,Kárason H.Compositional Heterogenerityinthe Bottom1000Kilometers of Earth s Mantle:Toward a Hybrid Convection Model[M].Science,1999,283:1885-1888.
[6]Forte A M,Mitrovica J X.Deep-Mantle High-Viscosity Flowand Thermochemical Structure Inferred from Seismic and Geodynamic Data[J].Nature,2001,410:1049-1056.
[7]Romanowicz B,Durek J J.Mineral Physics and Seismic Tomography fromthe Atomic to the Global Scale.In:Karato S et al.eds.Geophys.Monogr.Ser.,Vol117.Washington D C:AGU,2000.161-179.
[8]Hama J,Suito K.Equation of State of MgSi O3Perovskite and its Thermoelastic Properties under Lower Mantle Condi-tions[J].J Geophys Res,1998,103:7443-7462.
[9]Wang Z.The Melting of Al-Bearing Pervoskite at Core-Mantle Boundary[J].Phys Earth Planet Inter,1999,115:219-228.
[10]He Lin,Gong Zizheng,Jing Fuqian.A Strength Softening Phase Transition Observed in Shocked(Mg0.92,Fe0.08)Si O3Perovskite at About83GPa[J].Chin Phys Lett,2008,25:332-335.
[11]Lin J F,Struzhkin V V,Jacobsen S D,et al.Spin Transition of Iron in Magnesiowstite in the Earth s Lower Mantle[J].Nature,2005,436:377-380.
[12]Oganov A R,Ono S.Theoretical and Experi mental Evidence for a Post-Perovskite Phase of MgSi O3in Earth s Dlayers[J].Nature,2004,430:445-448.
[13]Tsuchiya T,Wentzcovitch R M,da Silva C R S,et al.Spin Transitionin Magnesiowustitein Earth s Lower Mantle[J].Phys Rev Lett,2006,96:198501.
[14]Murakami M,Hirose K,Kawamura K,et al.Post-Perovskite Phase Transition in MgSiO3[J].Science,2004,304:855-858.
[2]Oganov A R,Brodholt J P,Price G D.The Elastic Constants of MgSi O3Perovskite at Pressures and Temperatures of the Earth s Mantle[J].Nature,2001,411:934-937.
[3]Karato S I,Karki B B.Origin of Lateral Variation of Seismic Wave Velocities and Density in the Deep Mantle[J].J Geophys Res,2001,106:21771-21783.
[4]Saltzer R L,van der Hilst R D,K rason H.Comparing P and S Wave Heterogeneity in the Mantle[J].Geophys Res Lett,2001,28:1335-1338.
[5]Van de Hilst R D,Kárason H.Compositional Heterogenerityinthe Bottom1000Kilometers of Earth s Mantle:Toward a Hybrid Convection Model[M].Science,1999,283:1885-1888.
[6]Forte A M,Mitrovica J X.Deep-Mantle High-Viscosity Flowand Thermochemical Structure Inferred from Seismic and Geodynamic Data[J].Nature,2001,410:1049-1056.
[7]Romanowicz B,Durek J J.Mineral Physics and Seismic Tomography fromthe Atomic to the Global Scale.In:Karato S et al.eds.Geophys.Monogr.Ser.,Vol117.Washington D C:AGU,2000.161-179.
[8]Hama J,Suito K.Equation of State of MgSi O3Perovskite and its Thermoelastic Properties under Lower Mantle Condi-tions[J].J Geophys Res,1998,103:7443-7462.
[9]Wang Z.The Melting of Al-Bearing Pervoskite at Core-Mantle Boundary[J].Phys Earth Planet Inter,1999,115:219-228.
[10]He Lin,Gong Zizheng,Jing Fuqian.A Strength Softening Phase Transition Observed in Shocked(Mg0.92,Fe0.08)Si O3Perovskite at About83GPa[J].Chin Phys Lett,2008,25:332-335.
[11]Lin J F,Struzhkin V V,Jacobsen S D,et al.Spin Transition of Iron in Magnesiowstite in the Earth s Lower Mantle[J].Nature,2005,436:377-380.
[12]Oganov A R,Ono S.Theoretical and Experi mental Evidence for a Post-Perovskite Phase of MgSi O3in Earth s Dlayers[J].Nature,2004,430:445-448.
[13]Tsuchiya T,Wentzcovitch R M,da Silva C R S,et al.Spin Transitionin Magnesiowustitein Earth s Lower Mantle[J].Phys Rev Lett,2006,96:198501.
[14]Murakami M,Hirose K,Kawamura K,et al.Post-Perovskite Phase Transition in MgSiO3[J].Science,2004,304:855-858.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心