Low hydrogen contents in the cores of terrestrial planets.

Low hydrogen contents in the cores of terrestrial planets.
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DOI:
10.1126/sciadv.1701876
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发表时间:
2018-03
期刊:
影响因子:
13.6
通讯作者:
Andrault D
Andrault D
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Clesi V;Bouhifd MA;Bolfan-Casanova N;Manthilake G;Schiavi F;Raepsaet C;Bureau H;Khodja H;Andrault D

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在行星吸积过程中,氢表现为亲石元素,不太可能成为行星核心的主要元素。氢一直被认为是一个重要的轻元素在地球的核心,由于可能亲铁的行为,在核幔分离。我们使用硅酸盐相中氢含量为450至1500 ppm(百万分之一)、压力为5至20 GPa、氧逸度在IW-3.7和IW-0.2范围内变化(比铁-方铁矿缓冲区低0.2至3.7个log单位)以及行星核心典型的Fe合金来重现行星分化条件。我们报告氢金属硅酸盐的分配系数约为2 × 10−1,比以前报告的低两个数量级,表明亲石行为。我们的研究结果表明,在地球和火星的核心H含量约为60 ppm。一个简单的水预算表明,最初存在于行星构建模块中的90%的水在行星吸积过程中丢失。保留的水优先分离到行星地幔中。
During planetary accretion, hydrogen behaves as a lithophile element and is unlikely to be a major element in planetary cores. Hydrogen has been thought to be an important light element in Earth’s core due to possible siderophile behavior during core-mantle segregation. We reproduced planetary differentiation conditions using hydrogen contents of 450 to 1500 parts per million (ppm) in the silicate phase, pressures of 5 to 20 GPa, oxygen fugacity varying within IW-3.7 and IW-0.2 (0.2 to 3.7 log units lower than iron-wüstite buffer), and Fe alloys typical of planetary cores. We report hydrogen metal-silicate partition coefficients of ~2 × 10−1, up to two orders of magnitude lower than reported previously, and indicative of lithophile behavior. Our results imply H contents of ~60 ppm in the Earth and Martian cores. A simple water budget suggests that 90% of the water initially present in planetary building blocks was lost during planetary accretion. The retained water segregated preferentially into planetary mantles.
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