Abstract The paper addresses the effects of pressure (P) and temperature (T) on thermal conductivity (λ) applied to crustal geotherms. A subset of the ca. 50 experimentally derived numerical P―T relations available in literature for typical crustal rock types was selected for this purpose. The relations comprise those from physical-contact laboratory methods (PCM), for P and T, as well as from a non-contact technique, the laser-flash analysis (LFA), for T. The effects on geotherms are quantified for two crustal models: (I) a simplified two-layer “Proterozoic” crust, which consists of granitic rocks in the upper part and granulitic rocks in the lower part and (II) a multi-layer “Phanerozoic” crust. We show that neglecting P–T correction of ambient λ leads to underestimation of T that is larger with increasing surface heat flow (qs). In the Phanerozoic crust, the T difference at the crust–mantle boundary is 130/50 K [PCM/LFA], for qs 60 mW m–2, and 240/100 K, for qs 80 mW m–2. In the Proterozoic crust, with qs typically

中文翻译：

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地壳地热的模糊性：导热性的观点

摘要 本文讨论了压力 (P) 和温度 (T) 对应用于地壳地温的热导率 (λ) 的影响。的一个子集。为此选择了 50 个在文献中可用的典型地壳岩石类型的实验得出的数值 P-T 关系。这些关系包括来自物理接触实验室方法 (PCM) 的 P 和 T 关系，以及来自非接触技术、激光闪光分析 (LFA) 的 T 关系。量化了两个地壳对地热的影响模型：(I) 简化的两层“元古代”地壳，由上部花岗质岩和下部麻粒岩组成；(II) 多层“显生界”地壳。我们表明，忽略环境 λ 的 P-T 校正会导致对 T 的低估，随着表面热流 (qs) 的增加而增大。在显生宙地壳中，壳幔边界处的 T 差为 130/50 K [PCM/LFA]，对于 qs 60 mW m-2，和 240/100 K，对于 qs 80 mW m-2。在元古代地壳中，qs 通常是