Temperature profiles in the earth of importance to deep electrical conductivity models
Temperature profiles in the earth of importance to deep electrical conductivity models
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DOI：
10.1007/978-3-0348-7373-4_4
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发表时间：
1987-03
影响因子：
2
通讯作者：
V. Čermák;M. Laštovičková
中科院分区：
文献类型：
--
作者：
V. Čermák;M. Laštovičková
在地球深处，地质物质的导电性非常依赖于温度。因此，温度的知识是必不可少的任何解释大地电磁数据在预测岩石圈结构模型。大地热流、辐射生热和岩石热导率的测量值允许将地表观测外推到更大的深度，并计算岩石圈内的温度场。提出并讨论了深部温度计算的各种方法。提出了欧洲主要构造区的特征地温，并表明地壳-上地幔边界上的现有温度可能在350- 1，000 °C的宽区间内变化。目前的工作是在200- 1，000 °C范围内对选定的地壳和上地幔岩石电导率的温度依赖性进行调查。它示出了如何的温度场的知识可以被用来在深部电导率模式的评价通过转换的电导率与温度的数据到电导率与深度的数据。
Deep in the Earth, the electrical conductivity of geological material is extremely dependent on temperature. The knowledge of temperature is thus essential for any interpretation of magnetotelluric data in projecting lithospheric structural models. The measured values of the terrestrial heat flow, radiogenic heat production, and thermal conductivity of rocks allow the extrapolation of surface observations to a greater depth and the calculation of the temperature field within the lithosphere. Various methods of deep temperature calculations are presented and discussed. Characteristic geotherms are proposed for major tectonic provinces of Europe and it is shown that the existing temperatures on the crust-upper mantle boundary may vary in a broad interval of 350–1,000°C. The present work is completed with a survey of the temperature dependence of electrical conductivity for selected crustal and upper mantle rocks within the interval 200–1,000°C. It is shown how the knowledge of the temperature field can be used in the evaluation of the deep electrical conductivity pattern by converting the conductivity-versus-temperature data into the conductivity-versus-depth data.