Schaefer Laura, Elkins-Tanton Linda T
School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA
School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA.
Philos Trans A Math Phys Eng Sci. 2018 Oct 1;376(2132):20180109. doi: 10.1098/rsta.2018.0109.
Magma oceans are a common result of the high degree of heating that occurs during planet formation. It is thought that almost all of the large rocky bodies in the Solar System went through at least one magma ocean phase. In this paper, we review some of the ways in which magma ocean models for the Earth, Moon and Mars match present-day observations of mantle reservoirs, internal structure and primordial crusts, and then we present new calculations for the oxidation state of the mantle produced during the magma ocean phase. The crystallization of magma oceans probably leads to a massive mantle overturn that may set up a stably stratified mantle. This may lead to significant delays or total prevention of plate tectonics on some planets. We review recent models that may help alleviate the mantle stability issue and lead to earlier onset of plate tectonics.This article is part of a discussion meeting issue 'Earth dynamics and the development of plate tectonics'.
岩浆海洋是行星形成过程中高度加热的常见结果。据认为，太阳系中几乎所有大型岩石天体都经历了至少一个岩浆海洋阶段。在本文中，我们回顾了地球、月球和火星的岩浆海洋模型与当前地幔储层、内部结构和原始地壳观测结果相匹配的一些方式，然后我们给出了岩浆海洋阶段产生的地幔氧化态的新计算结果。岩浆海洋的结晶可能导致大规模的地幔翻转，这可能会形成一个稳定分层的地幔。这可能会导致一些行星上板块构造的显著延迟或完全阻止。我们回顾了最近的模型，这些模型可能有助于缓解地幔稳定性问题并导致板块构造更早开始。本文是“地球动力学与板块构造的发展”讨论会议题的一部分。
