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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Spherical shell models of mantle convection with tectonic plates
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Spherical shell models of mantle convection with tectonic plates

机译：构造板块对流对流的球壳模型

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A simple three-dimensional spherical model of mantel convection, where plates are taken into account in the top boundary condition, allows to investigate the plate tectonics-mantle convection coupling in a self-consistent way. Avoiding the strong difficulties inherent in the numerical treatment of rheology, the plate condition appears efficient in reproducing the Earth-like features as subduction, mid-oceanic ridges and hotspots. Whereas the free-slip condition leads to a classical polygonal cell pattern with cylindrical hot plumes surrounded by downwellings, the plate condition favors the development of strong linear downwellings associated to passive diverging zones along plate boundaries. These cold currents, very similar to subductions, act the main role in mantle convection: they drive the whole circulation. In that context, hot plumes remain almost independent, except if on the long term, cold material spreading at the core surface induces a slight migration, below a few mm/yr, of their surface impingement. The main result is that plate tectonics appear to be more than a simple mode of organization of the surface movements, it is the essence of the Earth mantle dynamics.
机译：一个简单的三维壁炉对流球面模型，其中在顶部边界条件下考虑了板块，允许以自洽的方式研究板块构造-地幔对流耦合。避免了流变学数值处理固有的强力困难，板块条件似乎可以有效地再现类似地球的特征，如俯冲，洋中脊和热点。自由滑移条件导致带有柱状热羽的经典多角形单元格模式被下陷包围，而板状条件则有利于与沿板块边界的被动发散区相关的强线性下陷的发展。这些与俯冲非常相似的冷流在地幔对流中起主要作用：它们驱动整个循环。在这种情况下，热羽几乎保持独立，除非从长远来看，散布在核心表面的冷物质会引起其表面撞击的轻微迁移（低于数毫米/年）。主要结果是板块构造似乎不仅仅是地表运动的一种简单组织方式，它还是地球地幔动力学的本质。

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