Time scales and heterogeneous structure in geodynamic earth models

被引:190
作者
Bunge, HP
Richards, MA
Lithgow-Bertelloni, C
Baumgardner, JR
Grand, SP
Romanowicz, BA
机构
[1] Inst Phys Globe, Sismol Lab, F-75252 Paris 05, France
[2] Univ Calif Berkeley, Dept Geol & Geophys, Berkeley, CA 94720 USA
[3] Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA
[4] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87544 USA
[5] Univ Texas, Dept Geol Sci, Austin, TX 78713 USA
[6] Univ Calif Berkeley, Berkeley Seismol Lab, Berkeley, CA 94720 USA
关键词
D O I
10.1126/science.280.5360.91
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Computer models of mantle convection constrained by the history of Cenozoic and Mesozoic plate motions explain some deep-mantle structural heterogeneity imaged by seismic tomography, especially those related to subduction. They also reveal a 150-million-year time scale for generating thermal heterogeneity in the mantle, comparable to the record of plate motion reconstructions, so that the problem of unknown initial conditions can be overcome. The pattern of lowermost mantle structure at the core-mantle boundary is controlled by subduction history, although seismic tomography reveals intense large-scale hot (low-velocity) upwelling features not explicitly predicted by the models.
引用
收藏
页码:91 / 95
页数:5
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