The thermal history of leaky chronometers above their closure temperature
The thermal history of leaky chronometers above their closure temperature
复制标题
泄漏天文钟在其闭合温度以上的热历史
DOI：
10.1029/2002gl016484
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发表时间：
2003
影响因子：
5.2
通讯作者：
F. Albarède
中科院分区：
文献类型：
--
作者：
F. Albarède
本文提出了一个理论，它描述了在晶体冷却缓慢超过其闭合温度时，放射性同位素的体积扩散同时发生的放射性向内生长和损失。当一个给定的放射性同位素在寄主矿物中的扩散参数已知时，由开放系统行为引起的年龄亏损可以简单地与冷却速率有关。太古代榴辉岩捕虏体中镁铝榴石石榴石的147 Sm-143 Nd表观年龄的应用证明了大陆岩石圈的缓慢冷却速率。
A theory is presented which describes the simultaneous radiogenic ingrowth and loss of a radiogenic isotope by volume diffusion in crystals cooling slowly above their closure temperatures. When the diffusion parameters of a given radiogenic isotope in the host mineral are known, the age deficit resulting from the open system behavior can be simply related to the cooling rate. An application to the apparent 147Sm‐143Nd ages of pyrope garnets in Archean eclogite xenoliths attests to the slow cooling rate of the subcontinental lithosphere.