Hydrogenation of iron in the early stage of Earth's evolution.
Hydrogenation of iron in the early stage of Earth's evolution.
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DOI：
10.1038/ncomms14096
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发表时间：
2017-01-13
影响因子：
16.6
通讯作者：
Sano-Furukawa A
中科院分区：
文献类型：
--
作者：
Iizuka-Oku R;Yagi T;Gotou H;Okuchi T;Hattori T;Sano-Furukawa A
地核的密度低于纯铁的密度，地核中的轻元素是一个长期存在的问题。氢是太阳系中最丰富的元素，因此是重要的候选者之一。然而，氢在铁中的溶解过程仍不清楚。在这里，我们进行了高压高温原位中子衍射实验，阐明了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，铁就发生了氢化。这意味着在地球演化的早期，随着积累的原始物质变得更热，氢溶解成铁发生在任何其他物质融化之前。这表明氢很可能是地球演化过程中第一个溶解到铁中的轻元素，并且它可能会在后来的过程中影响其他轻元素的行为。地核的密度比纯铁要低，许多研究都在寻找可能存在的轻元素。作者在这里进行了现场高压和高温中子实验，表明氢可能是第一个溶解到铁核中的轻元素。
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. The Earth's core has lower density than pure iron and many studies have looked into which light elements may be present. The authors here carry out in situ high pressure and temperature neutron experiments indicating that hydrogen may have been the first light element to dissolve into the iron core.