期刊
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
卷 277, 期 -, 页码 30-37出版社
ELSEVIER
DOI: 10.1016/j.pepi.2018.01.007
关键词
Sulfur; Iron; Fe3S2; High pressure; Density of Fe-S liquid; Deep carbon cycle
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan [23340129, 21684032]
- Grants-in-Aid for Scientific Research [26247089, 23340129, 15H05826, 16K13901, 15K21712, 21684032, 15H05828] Funding Source: KAKEN
The phase relationships of the Fe-Ni-S system at 15 GPa were studied by high pressure quench experiments. The stability fields of (Fe,Ni)(3)S and (Fe,Ni)(3)S-2 and the melting relationships of the Fe-Ni-S system were determined as a function of Ni content. The (Fe,Ni)(3)S solid solution is stable in the composition of Ni/(Fe + Ni) > 0.7 and melts incongruently into an Fe-Ni alloy + liquid. The (Fe,Ni)(3)S-2 makes a complete solid solution and melts incongruently into (Fe,Ni)S + liquid, whose structure was determined to show Cmcm-orthorhombic symmetry by in situ synchrotron X-ray diffraction experiments. The eutectic contains about 30 at.% of S, and its temperature decreases with increasing Ni content with a rate of similar to 5 K/at.% from 1175 K. The density of the Fe-FeS eutectic composition (Fe70S30) liquid is evaluated to be 6.93 +/- 0.08 g/cm(3) at 15 GPa and 1200 K based on the Clausius-Clapeyron relations and densities of subsolidus phases. The Fe-Ni-S liquids are a primary sulfur-bearing phase in the deep mantle with a reducing condition (250-660 km depth), and they would play a significant role in the carbon cycle as a carbon host as well as in the generation of diamond.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据