Upper Mantle Electrical Conductivity Variations Beneath North America and Adjacent Oceans

小行星9530019 这是一项为期三年的合作提案，旨在调查海洋和大陆下方的上地幔（1000公里）电导率差异。 陆下和洋下上地幔成分和温度的差异被提出来解释大量的地球物理数据（jordan，1975），并被假定在板块构造和地幔对流中起重要作用。 这一概念，被称为构造圈概念，设想陆下地幔是冷的，相对于洋下地幔铁贫化。 地幔的电性强烈地依赖于温度和铁，因此，预计将有相当多的信息，在海底和次大陆上地幔之间的电性差异。 该项目将涉及收集几个现场数据集，这些数据集将被合并成一个一致和强大的上地幔导电性结构三维模型，以详细了解构造圈概念。

9530019 Maciie This is a three year collaborative proposal for investigating upper mantle ( 1000 km) conductivity differences beneath the oceans and continents. Subcontinental and suboceanic upper mantle compositional and temperature differences have been proposed to explain a wide array of geophysical data (jordan, 1975) and are postulated to play an important role in plate tectonics and mantle convection. This concept, known as the tectosphere concept, envisions that the subcontinental mantle is cold and depleted in iron relative to the suboceanic mantle. Electrical properties in the mantle are strongly dependent upon both temperature and iron, and hence, it is expected that there would be considerable information in the electrical property differences between the suboceanic and subcontinental uppers mantles. The project will involve collections of several field data sets which will be combined into a consistent and robust 3-D model of the upper mantle conductivity structure for a detailed electrical look at the tectosphere concept.