铁火山活动：金属小行星上的铁火山作用
Ferrovolcanism: Iron Volcanism on Metallic Asteroids.
作者信息
Abrahams Jacob N H, Nimmo Francis
机构信息
Department of Earth and Planetary Science, University of California Santa Cruz, Santa Cruz, CA 95064.
出版信息
Geophys Res Lett. 2019 May 28;46(10):5055-5064. doi: 10.1029/2019gl082542.
Metallic asteroids, the exposed cores of disrupted planetesimals, are expected to have been exposed while still molten. Some would have cooled from the outside in, crystallizing a surface crust which would then grow inward. Because the growing crust is expected to be more dense than the underlying melt, this melt will tend to migrate toward the surface whenever it is able. Compressional stresses produced in the crust while it cools will be relieved locally by thrust faulting, which will also provide potential conduits for melt to reach the surface. We predict iron volcanism to have occurred on metallic asteroids as they cooled and discuss the implications of this process for both the evolution and the modern appearance of these bodies.
金属小行星是被破坏的小行星的暴露核心，预计在它们仍处于熔融状态时就已暴露。有些会从外部向内冷却，使表面地壳结晶，然后地壳会向内生长。由于预计生长的地壳比下面的熔体密度更大，这种熔体将在能够迁移时倾向于向表面迁移。地壳冷却时产生的压缩应力将通过逆冲断层作用在局部得到缓解，这也将为熔体到达表面提供潜在的通道。我们预测在金属小行星冷却时会发生铁火山活动，并讨论这一过程对这些天体的演化和现代外观的影响。
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