The age of the inner core
The age of the inner core
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DOI：
10.1016/s0012-821x(01)00387-9
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发表时间：
2001-08-15
影响因子：
5.3
通讯作者：
Le Mouël, JL
中科院分区：
文献类型：
--
作者：
Labrosse, S;Poirier, JP;Le Mouël, JL
能量守恒定律，当应用于地球的核心和整合之间的开始结晶的内核和现在的时间，给出了一个方程的年龄内核。在这个方程中，所有的项都可以在理论上表示，并且，给定所有相关物理参数的值和不确定性，内核的年龄可以作为核幔边界处的热通量和放射性元素浓度的函数来获得。结果表明，在核中不存在放射性元素的情况下，内核的年龄不可能超过2.5Ga，最可能在1Ga左右。此外，要有一个像地球一样古老的内核，内核中所需的放射性元素浓度太高，从地球化学的角度来看是不可接受的。(C)2001 Elsevier Science B.V.保留所有权利。
The energy conservation law, when applied to the Earth's core and integrated between the onset of the crystallization of the inner core and the present time, gives an equation for the age of the inner core. In this equation, all the terms can be expressed theoretically and, given values and uncertainties of all relevant physical parameters, the age of the inner core can be obtained as a function of the heat flux at the core-mantle boundary and the concentrations in radioactive elements. It is found that in absence of radioactive elements in the core, the age of the inner core cannot exceed 2.5 Ga and is most likely around I Ga. In addition, to have an inner core as old as the Earth, concentrations in radioactive elements needed in the core are too high to be acceptable on geochemical grounds. (C) 2001 Elsevier Science B.V. All rights reserved.