Interpretation of electrical conductivity anomalies observed in magnetotelluric models provides an important opportunity to understand the nature of the lithospheric mantle and its dynamics. Over the course of the last two decades, a great number of experimental petrology studies have been carried out which can be utilized to construct electrical conductivity distribution models for a given composition and geotherm. We have developed an open‐source software (MATE, Mantle Analysis Tool for Electromagnetics) with an easy‐to‐use graphical interface that creates such theoretical models. The program is developed in such a way that additional effects and models can be added very easily. To investigate the conductivity distribution of the cratonic mantle, a series of experiments was made. Results indicate that it is of utmost importance to analyze the magnetotelluric models using accurate compositions, water distributions, and geometric models. Hence, using only olivine conductivity models can lead to erroneous interpretations of both conductivity and estimated water content. Analysis of the potential causes for conductive anomalies shows that the upper and lower lithospheric mantle can be interpreted separately with the transition between them at 75–125 km. Conductive anomalies in the upper lithospheric mantle (<1,000 Ωm) are likely to be explained by the existence of well‐connected minor phases associated with metasomatic fluids, whereas in the lower lithospheric mantle, hydration and/or well‐connected minor phases (e.g., phlogopite or amphibole) can explain conductive anomalies.

中文翻译：

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MATE：用于解释地幔大地电磁模型的分析工具

在大地电磁模型中观察到的电导率异常的解释为理解岩石圈地幔的性质及其动力学提供了重要的机会。在过去的二十年中，已进行了大量的实验岩石学研究，这些研究可用于构造给定成分和地热的电导率分布模型。我们已经开发了一个开源软件（MATE，用于电磁学的地幔分析工具），该软件具有易于使用的图形界面，可以创建这种理论模型。该程序的开发方式可以非常轻松地添加其他效果和模型。为了研究克拉通地幔的电导率分布，进行了一系列实验。结果表明，使用准确的成分，水分布和几何模型来分析大地电磁模型至关重要。因此，仅使用橄榄石电导率模型会导致对电导率和估计的水含量的错误解释。对导电异常的潜在原因进行的分析表明，上，下岩石圈地幔可以在75-125 km处进行单独解释。岩石圈上地幔中的导电异常（对导电异常的潜在原因进行的分析表明，上，下岩石圈地幔可以在75-125 km处进行单独解释。岩石圈上地幔中的导电异常（对导电异常的潜在原因进行的分析表明，上，下岩石圈地幔可以在75-125 km处进行单独解释。岩石圈上地幔中的导电异常（<1000Ω米）很可能是由与交代流体相关联的公连接次要相的存在在较低的地幔，水合解释，而和/或公连接次要相（例如，金云母或闪石）可以解释导电异常。