Silicate melts during Earth's core formation
Silicate melts during Earth's core formation
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DOI：
10.1016/j.chemgeo.2016.12.035
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发表时间：
2017-06-20
期刊：
影响因子：
3.9
通讯作者：
Andrault, D.
中科院分区：
文献类型：
--
作者：
Bouhifd, M. A.;Clesi, V.;Andrault, D.
原始物质的吸积和随后的行星核幔分化是地球和太阳系的基本问题。关于这些过程的许多问题，虽然在过去几十年中作为模型设想得到了很好的发展，但仍然是开放的，并有很多争论。在地球早期，在其形成和分化为岩石地幔和富铁的核心，它可能是硅酸盐熔体在塑造地球的主要水库，因为我们知道他们今天发挥了重要作用。在这里，我们回顾了最近的几个结果，在一个深岩浆海洋的情况下，给我们的星球的早期演化的严格限制。这些结果包括一些亲铁元素（Ni和Fe），亲石元素（Nb和Ta）和一种挥发性元素（He）在地核形成过程中的行为。我们还将讨论早期岩浆海的熔融和结晶，以及对核幔分离总体特征和岩浆海深度的影响。本文还讨论了岩浆洋晶化过程中Fe ~（2+）和Fe ~（3+）在硼镁石中的掺入。这里提出的所有例子都强调了地球历史最早时期的主要条件在决定我们星球的组成和动态历史方面的重要性。(C)2016爱思唯尔B. V.保留所有权利。
Accretion from primordial material and its subsequent differentiation into a planet with core and mantle are fundamental problems in terrestrial and solar system. Many of the questions about the processes, although well developed as model scenarios over the last few decades, are still open and much debated. In the early Earth, during its formation and differentiation into rocky mantle and iron-rich core, it is likely that silicate melts played an important part in shaping the Earth's main reservoirs as we know them today.Here, we review several recent results in a deep magma ocean scenario that give tight constraints on the early evolution of our planet. These results include the behaviour of some siderophile elements (Ni and Fe), lithophile elements (Nb and Ta) and one volatile element (Helium) during Earth's core formation. We will also discuss the melting and crystallization of an early magma ocean, and the implications on the general feature of core-mantle separation and the depth of the magma ocean. The incorporation of Fe2+ and Fe3+ in bridgmanite during magma ocean crystallization is also discussed. All the examples presented here highlight the importance of the prevailing conditions during the earliest time of Earth's history in determining the composition and dynamic history of our planet. (C) 2016 Elsevier B.V. All rights reserved.