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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >How is the european lithosphere imaged by magnetotellurics?
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How is the european lithosphere imaged by magnetotellurics?

机译：大地电磁如何对欧洲岩石圈成像？

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I review recent investigations on the electrical conductivity of the lithosphere and asthenosphere in Europe. The principal method in the reviewed studies is the magnetotelluric method, but in many cases other electromagnetic methods (e.g., magnetovariational profilings and geomagnetic depth soundings) have provided additional information on subsurface conductivity or have been the primary method. The review shows that the magnetotelluric method has been used, and is being used, in all kinds of environments and for many different processes shaping the crust and lithosphere. The crust is very heterogeneous, both with respect to the scale of conductive/resistive features and interpretations: research targets vary from Archaean palaeostructures to ongoing processes. The European database of the depth to the lithosphere-asthenosphere boundary (LAB) in Europe is updated, and a new map showing lateral variations of the depth of LAB is provided. The compilation shows that (1) the Phanerozoic European lithosphere, with considerable variations (45-150 km), is much thinner than the Precambrian European lithosphere, (2) the Trans-European Suture Zone is a major electrical border in Europe separating electrically (as well as geophysically and geologically in general) two quite different settings, (3) the thinnest lithosphere is found under the extensional Pannonian Basin (45-90 km), (4) in most of the East European Craton there are no indications of a high conductivity zone in upper mantle. In many regions there is no information at all on upper mantle conductivity, which calls for pan-European projects to operate arrays of simultaneously recording instruments with long recording periods (2-8 months) and dense spatial sampling (20-50 km).
机译：我回顾了有关欧洲岩石圈和软流圈电导率的最新研究。回顾性研究中的主要方法是大地电磁方法，但在许多情况下，其他电磁方法（例如磁变曲线和地磁深度探测）已经提供了有关地下电导率的其他信息，或者已经成为主要方法。审查表明，大地电磁方法已在各种环境中使用，并且正在用于形成地壳和岩石圈的许多不同过程。在导电/电阻特征和解释的规模方面，地壳非常不均一：研究目标从古生古构造到进行中的过程不等。更新了欧洲岩石圈-软流圈边界（LAB）深度的欧洲数据库，并提供了显示LAB深度横向变化的新地图。汇编显示，（1）杂多纪的欧洲岩石圈变化很大（45-150 km），比前寒武纪的欧洲岩石圈薄得多;（2）跨欧洲缝合线带是欧洲主要的电边界，电气隔离（以及在地球物理和地质上）两个完全不同的设置，（3）在延伸的Pannonian盆地（45-90 km）下发现了最薄的岩石圈，（4）在大多数东欧克拉通中没有迹象表明上地幔的高电导率带。在许多地区，完全没有关于上地幔电导率的信息，这要求整个欧洲项目同时运行具有长记录周期（2-8个月）和密集空间采样（20-50 km）的记录仪器阵列。

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