一种可能性是,足够的铀的存在提供了一个巨大的热源……在地幔深处而不是核心。[Gautron et al . [1]] (https://doi.org/10.1029/2006GL027508)研究铀的包含在一个aluminum-doped硅酸钙钙钛矿,这被认为存在于下地幔(作者引用参考。[2](https://doi.org/10.1029/2001JB000597))。硅酸铝掺杂的钙钛矿成为兼容铀(IV),从而“在这一地区所有在场的铀可以很容易地通过插入存储在Al-CaSiO3钙钛矿。”The authors suggest that thorium, which also favors the +4 oxidation state and forms a similarly large cations, may similarly be incorporated, although they directly studied only uranium. **References** 1. Laurent Gautron, Steeve Greaux, Denis Andrault, Nathalie Bolfan-Casanova, Nicolas Guignot, M. Ali Bouhifd (2006). "Uranium in the Earth's lower mantle". _Geophysical Research Letters_ **33**(23), L23301. https://doi.org/10.1029/2006GL027508. 2. Hirose, K. (2002). "Phase transitions in the pyrolitic mantle around 670–km depth: Implications of upwellings of plumes from the lower mantle". _J. Geophys. Res._, **107**(B4), 2078. https://doi.org/10.1029/2001JB000597.