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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Influence of early plate tectonics on the thermal evolution and magnetic field of Mars
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Influence of early plate tectonics on the thermal evolution and magnetic field of Mars

机译：早期板块构造对火星热演化和磁场的影响

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Recent magnetic studies of Mars suggest that (1) it possessed a periodically reversing magnetic field for the first similar to 500 Myr of its existence and (2) plate tectonics may have been operating during this time. On Earth the geodynamo is thought to occur because of convection in the outer core. This paper estimates the amount of heat the Martian core can conduct in the absence of convection. It uses parameterized, variable-viscosity thermal evolution models to show that the core heat; flux increases if the planet's surface heat flux is increased above the value required to eliminate instantaneous radiogenic heat production. Conversely, a sudden reduction in surface heat Aux causes the mantle to heat up and the core heat flux to become negative. Thus, if plate tectonics, or some other process causing high surface heat flux, was occurring on early Mars, it is likely to have caused convection in the core and hence generated a magnetic field. Conversely, a reduction in surface heat flux would probably have caused the core to stop convecting and shut off the magnetic field. There is thus an important link between surface processes and core magnet;ism, which may also be relevant to planets such as Earth and Venus. [References: 46]
机译：最近对火星的磁场研究表明，（1）它最初具有类似于其存在的500 Myr的周期性反转磁场，并且（2）板块构造可能在此期间一直在运行。地球上的地球动力学被认为是由于外核对流造成的。本文估计了火星核心在不对流情况下可以传导的热量。它使用参数化的，可变粘度的热演化模型来显示核心热量。如果行星的表面热通量增加到消除瞬时放射性热产生所需的值以上，则通量增加。相反，表面热量Aux的突然降低导致地幔变热，而岩心热通量变为负值。因此，如果在火星早期发生板块构造或其他引起高表面热通量的过程，则很可能在岩心中引起对流并因此产生了磁场。相反，表面热通量的减少可能会导致磁芯停止对流并关闭磁场。因此，表面过程与核心磁现象之间存在着重要的联系，这也可能与诸如地球和金星之类的行星有关。 [参考：46]

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