Geodynamics Research Center, Ehime University, Matsuyama, Ehime 790-8577, Japan.
Geochemical Research Center, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
Nat Commun. 2017 Jan 13;8:14096. doi: 10.1038/ncomms14096.
Density of the Earth's core is lower than that of pure iron and the light element(s) in the core is a long-standing problem. Hydrogen is the most abundant element in the solar system and thus one of the important candidates. However, the dissolution process of hydrogen into iron remained unclear. Here we carry out high-pressure and high-temperature in situ neutron diffraction experiments and clarify that when the mixture of iron and hydrous minerals are heated, iron is hydrogenized soon after the hydrous mineral is dehydrated. This implies that early in the Earth's evolution, as the accumulated primordial material became hotter, the dissolution of hydrogen into iron occurred before any other materials melted. This suggests that hydrogen is likely the first light element dissolved into iron during the Earth's evolution and it may affect the behaviour of the other light elements in the later processes.
地核的密度低于纯铁，而地核中的轻元素一直是个问题。氢是太阳系中最丰富的元素，因此也是重要的候选元素之一。然而，氢溶解到铁中的过程仍不清楚。在这里，我们进行了高压高温原位中子衍射实验，结果表明，当铁和含水矿物的混合物被加热时，在含水矿物脱水后不久，铁就被氢化了。这意味着，在地球演化的早期，随着积累的原始物质变得越来越热，在任何其他物质融化之前，氢就已经溶解到铁中了。这表明，在地球演化过程中，氢很可能是第一个溶解到铁中的轻元素，它可能会影响后来过程中其他轻元素的行为。
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